In mining operations, the layout of crushing plants and ancillary equipment and structures is a crucial factor in meeting production requirements while keeping capital and operational costs to a minimum. This paper addresses the critical design parameters as well as the consideration of ore characteristics, geographical location, climatic conditions, expected operational life, expansion potential, safety, environment, and operability and maintainability.

The fundamental goal for the design of a crushing plant is an installation that meets the required production requirements, operates at competitive cost, complies with today's tough environmental regulations, and can be built at a reasonable price despite the rising costs of equipment, energy and construction labor.

There are three main steps in designing a good crushing plant: process design, equipment selection, and layout. The first two are dictated by production requirements and design parameters, but the layout can reflect the input, preferences and operational experience of a number of parties.

Crushing plants must be designed for ease of access and maintainability if they are to meet their production goals. Keeping maintenance requirements to a minimum helps achieve higher overall operating availability. Scheduled preventive maintenance at crushing plants involves a number of elements, including: crusher wear parts, screen decks, feeder wear parts, conveyor skirting and adjustment, Oil and lubrication, conveyor belt repair, visual inspections, electrical and instrumentation adjustments.

Building for cold-weather operations is very challenging, as is designing a plant in a desert environment. This is particularly true when year-round operation is required. Seasonal variations can change ore moisture content, so the crushing plant must be adaptable to changes in the material flow characteristics. Higher moisture requires greater angles of withdrawal, and stoneboxes must be designed to avoid plugging. The crushing plant equipment itself must be adjustable to climatic changes; for example, screen decks must be designed to maintain production, possibly by using wire mesh during the wet season and plastic during the dry. Vary screen deck types dependent on seasons and material characteristics to achieve maximum passing through deck openings.

Equipment suppliers are offering ever-larger primary crushers, with 1,800 mm (72 in) gyratories expected soon, as well as secondary and tertiary machines of up to 3,000 mm (120 in).

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Mining is a process by which the earth is drilled, usually by heavy machinery, to extract minerals and other materials from beneath the soil. Mining is carried out to retrieve a number of substances such as coal, gold, iron, diamonds, potash and uranium. While mining yields important substances for sale and industrial production, mining also affects the natural environment.

Ecosystems are affected by the physical perturbations of mining operations, as well as the chemical alterations in soil and water. Mining activities vary, but can include soil compaction and conversely, removal of the topsoil. These alterations disrupt nutrient dynamics by minimizing the availability of nitrogen and phosphorus, lower the pH through the acidification of the soil and can introduce toxic metals and acids. Depending on the scale and nature of the mining operation, these effects can be localized to the location of the mining or, through local hydrology, can extend to nearby aquatic systems, such as stream, wetlands and lakes.

All mining activities create considerable waste, including acid runoff and chemical byproducts of refining. Coal mines are particularly prone to acid runoff. When large amounts of rainwater enters functioning or abandoned mines, the water becomes acidic and contaminated with heavy metals. The Environmental Protection Agency estimates that 40 percent of western U.S. watershed have been contaminated by mine waste. In the United States, the mining industry is the top toxic polluter. The problems are frequently more pronounced in under-regulated developing countries, where mining companies can be free to pollute with impunity. Water pollution from mines has been known to decimate aquatic life, and seriously impact bird and mammal populations. Water sources used by humans have also been contaminated, posing serious risks to human health.

Mining operations often contaminate the soil with toxic heavy metals and acids. Acids can lower the pH of the soil, preventing plants and soil microorganisms from thriving, and can also react with various minerals in the soil that are required by plants, such as calcium and magnesium. The hydrogen ions from the acid absorb the soil particles, preventing other nutrients required by plants to remain in the soil. These chemical alterations can interact with soil compaction. Because water isn't moving through the soil profile, some of the metals and acids can get carried away by the water, extending the mining effects throughout greater portions of the landscape. Elkins, Parker, Aldon and Whitford report in their article 'Responses of Soil Biota to Organic Ammendments in Stripmine Spoils in Northwestern New Mexico,' in the 'Journal of Environmental Quality,' 1984, that the addition of organic matter to mined lands can increase water retention in the soil, as well as the microbial process of nutrient accumulation and processing, potentially offsetting and minimizing the ecosystem effects from mining operations.

Mining releases particles of various kinds into the air, which has an impact on air quality. Some of these substances are harmless, such as dust particles, while others can be potentially dangerous. Dangerous particles include arsenic, cadmium and lead. Over time, and in sufficient quantities, these dangerous particles can have an effect on human health, especially respiratory health. Emphysema is one potential effect of prolonged inhalation of dangerous particles. These particles can also be ingested or absorbed through the skin.

20-02-2012 om 09:16 geschreven door annazhao356  

Crushing ratio also named size reduction ration is a measure of crushing effect, the concept of common crushing ratio. Crushing ratio is raw material size and crushed after the product size ratio. It is shown that after the broken table of reducing the extent of raw materials.

Crushing ration or size reduction ration features the following methods.

1). Crushing material before the maximum particle size of crushed products maximum particle size ratio calculated I = Dmax / Dmax type Dmax -- broken before the material of the maximum particle size; Dmax -- broken materials maximum particle size.

Due to the different habits, maximum size value method. Britain and the United States in 80% through the sieve mesh material width for the maximum particle size diameter, China and the former Soviet Union to material 95% can pass sieve mesh width of maximum particle diameter.

2). Crusher with a feeding opening width and the width of discharge opening ratio of I = 0.85B / B type B - crusher feeding mouth width; B - crusherwidth of discharge opening; 0.85 guarantee crusher on the effective width of feed material. Outlet width of coarse crusher, maximum width of discharge opening; in crusher takes the minimum width of discharge opening.

3). With average particle size calculation of I = Dcp / DCP type Dcp - broken before the material with an average diameter of DCP - broken materials; average diameter.

Hongxing counterattack crusher with big crushing ratio.

The crushing impact crusher than can achieve more than 50, finished materials particles grain shape good. Under the impact, being broken down its most vulnerable material often, this selective fractured planes crushing method, the grain-size uniform, discharging a cube shapes, fine powder and dust content is low, and so, in need of situations. Cubes particles For example, prevent slippery pavement of high grade highway, usually by impact breaker as eventually broken equipment, producing concrete aggregate.

The cost of power is a major expense in crushing and grinding, so the factors that control this cost are important.

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Most of the current manufacturing crusher drive technology are driving the use of mechanical equipment and electronic drive to achieve, but recent crusher manufacturing began to drive technology into the field of hydraulic drive, hydraulic drive refers to the so-called motor driven hydraulic pump to establish a certain degree of hydraulic, hydraulic oil through the valve to the specified cylinder, push the piston movement, but there are some views that the hydraulic drive technology is “outdated”, but the characteristics of the hydraulic hybrid technology is still a lot of applications is widely used with, and meet the large demand for actual production.

With the changes in market demand and crusher increasing the degree of competition in the industry, can effectively increase the life of a variety of crusher equipment, has been following the lower production costs, increase production of the device after another basic requirement, but as buyers, in order to increase production, often make the crusher at a high load operating state, with the temporary increase of production, but has largely depleted the crusher equipment should have life, and crusher of the hydraulic drive technology used, not only in improving the efficiency, but also more effective to reduce the load on the crusher, the crusher equipment to reduce the weight for the crusher equipment to create a more “healthy” production environment.

The main structure of the hydraulic crusher includes hydraulic breaker, work equipment, hydraulic equipment, electrical equipment, controls, hydraulic breakers can be a special place of mineral aggregate crushing, and removal of obstruction to the feeder, make it work.

In addition to the hydraulic drive technology in dealing with large volumes of applications has more advantages, including; big load transfer; extrusion molding, pressure molding technology; bending, stamping and other forming processes; connection and assembly processes, etc..

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Along with the rapid growth of Chinese economy, our country has made great achievements in various construction, but meanwhile we also pay heavy cost for resource waste and environmental destruction. The contradiction between economic development and resources and environment is gradually becoming more acute. The issue on environmental pollution arouse intense concern among the masses. Thus, to achieve energy saving and emission reduction needs the full cooperation of all sectors of society and each enterprise, and the active guidance from the quality and environment departments is especially of great significance.

As one famous joint-stock enterprise for mining machinery in China, Henan Hongxing Mining Machinery Co., Ltd. has already placed the plan of energy saving and emission reduction on the agenda. We positively respond to the national policy, and strictly adhere to the policy stipulated by the government to process our products. So we can further improve our company's social influence while making profits.

Energy saving and emission reduction not only brings social and economic benefits but also is the responsibility for the mining machinery industry. The equipments manufactured by Hongxing Machinery Group are strictly in accordance with the requirements of the national quality and environment departments. Hongxing Mining Machinery is making every effort to push forward the building of a new environment-friendly society. Such as, energy-saving coal ball mill, ultra-fine Raymond mill, mobile crushing station, YK series vibrating screen. These high-quality and efficient products are well received among most customers.

18-02-2012 om 03:54 geschreven door annazhao356  

In the design of large industrial milling process, when the production scale and product mix basically determined, how to configure the mill, will directly affect the milling system design, process effectiveness and economic efficiency. Our powder making machine is designed with the most advanced host device, together with a special milling machine technical parameters, selection processes, unique grinding, hit with technology, investing in rare cases for process transformation, the effect is significant, with good promotion prospects.

Production is a milling process design with the goal of the important indicators, and the mill model, the choice of the number, there is the size of investment. The milling machine milling process is the core of the device, its effect is related to grinding flour yield, yield quality and other economic and technical indicators. Now most of the milling process are selected according to the first production of mill type and quantity, and then redistributed to the various aspects of the milling process.

Here, for your better learning about the mill, there are some recommendations as follows.

(1) Reasonably determine the mill type and quantity of the industrial milling process more reasonable and better. Mill more, the system assigns the finer adjustment of the system greater flexibility, the more perfect technology.

(2) Different types of milling machines for use with both investment and reduce operating costs savings. Meet the process requirements, the mill can mix different models in order to reduce investment.

Mill production configuration must be designed based on the process is reasonable, the principle advanced in comparison, the analysis of different configurations, based on to be preferred in order to achieve the desired effect of milling process.

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As with any piece of complex equipment operating in a difficult environment and in order to protect your investment, both your operators and technicians need a good understanding of the equipment, how best to operate it safely and efficiently and care for it. For example, Raymond mill use and maintenance in the use of the process, there should be a fixed charge of personnel, the operator must have a certain level of technology.

1. Before the installation the operator must carry out the necessary technical training, so that understanding the principles of mill performance, familiar procedures.

2. For the mill to normal, the device should be developed, “the safe operation of equipment maintenance system” can ensure the long-term safe operation of the mill, and have the necessary maintenance tools and grease and corresponding accessories.

3. Mill use for some time, maintenance should be carried out, while roller blade grinding ring repair replacement of wearing parts such as handle, roller device in use before and after the bolt nut should be carefully examined to see whether there is loosening , whether to add a little grease.

4. The roller device to use more than 500 hours or so to replace the roller, the roller bearing kit must be cleaned of all, the damaged parts should be replaced, fuel pump and the tool can be used to manually add butter gun.

5. Fineness adjustment, according to the size of the material, hardness, moisture content, the proportion of different degree of processing of different thickness, can be adjusted at the top of the analyzer, high speed, fineness, low speed, low fineness. Improve the fineness, the output will be reduced accordingly, if it is mainly the fan speed when debugging, the user can flexibly.

6. Ring roller mill scrap the limit, the remaining minimum wall thickness of not less than 10mm.

7. Stop, stop the feeding, the host continues to He, the residual abrasive grinding continues, about one minute, turn off the master motor and the motor analyzer, stop grinding work, and later to stop the fan motor to blow the net residual powder.

18-02-2012 om 03:54 geschreven door annazhao356  

The roller crusher is mainly used for the crushing of medium or lower-hardness mines and rocks with medium or lower rigidity in the trade of cement, metallurgy, chemical industry, electric power, coal and other industrial. The crushing materials include limestone, slag, coke and coal.

This teeth roll crusher apply to coal, metallurgy, mine, chemical industry, building materials industries more suitable for large coal or coal gangue) crude (including the broken.

Teeth roll crusher work principle and main structure: teeth roll crusher mainly adopts special wear-resisting teeth roll high-speed material crushing (for errupted tooth roll crusher traditional with a low extrusion), formed the mechanism of high productivity.

The five categories used in the crushing machine, Roll crusher and hammer crusher impact with the main role belongs to brittle material to break the machine, it is often called the impact crusher. Impact crusher and the crusher-based compression, such as jaw, cone and roll crusher and other match, have the following characteristics:

1). Crushing ratio. Roll crusher can reach the crushing ratio above 50, while the jaw, cone and roll crusher is difficult to over 20. Thus, in the need for single-stage crushing of occasions, such as cement industry, limestone crusher, Roll crusher is widely used.

2). Good product particles. Under the impact, often by crushing the material level of fragmentation along its most vulnerable, such selective fragmentation method, the particles with a high probability of a cube shape, so the teeth roll crusher product content as low as a percentage flakiness 10%, while the jaw, cone and roll crusher products such as the percentage flakiness will be higher than 15% of the content. Thus, particles in the cube where needed. For example, high-grade anti-skid road surface, usually toothed roll crusher to break as the end device, produced concrete aggregate.

However, because the teeth roll crusher is crushing the material using the impact theory, the combat conditions, such as: hammer, hammer, impact plate, etc., in use wear very quickly. This defect, in the long period of time proportionate to restrict the teeth roll crusher combined range. Can only be used for crushing of hard materials. Followed by the application of new wear-resistant materials, roll crusher in cavity design, the rotor structure, especially the hammer plate materials and chucking methods is fundamentally different. Roll made of hard rock crusher, the beginning of the core parts of its hammer to rely on import, domestic hammer in the “85″ period as a ministerial-level scientific research projects, project success, not only to replace the entry of domestic plate hammer, and has been exported to Europe, Japan and other countries.

This teeth roll crusher's frame parts include transmission device, crushing roller, mechanical spring mechanism, linkage mechanism etc.

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Vibrating screen works depending on the complex rotary type vibration generated by vibrator. The vibrating screen is mainly classified into linear vibrating screen and circular vibrating screen. According to the vibrating type of the screen, the vibrating screen can be classified into the single shaft vibrator and double shaft vibrating screen. Vibrating screen is mainly used in mining, smelting, building materials, coal, refractory materials, light industry, chemical industry, medicine, food and other industries.

It is very beneficial to improve the working efficiency of a vibrating screen that the vibrating screen adopts the thin elastic screen net as the screen base. This screen net is generally made by rubber or polyurethane materials. Which can decrease the adhesive force between the screen surface and the raw materials, and it will make the material produce a second high frequency vibration to avoid blocking the screen hole and at the same time increases the permeability of the raw material. It also can release the mechanism of the screened material on the screen surface, which can bare larger vibrating amplitude than the steel-wire screen net.

Advantages of a metalloid screen net mainly include the following few points:

1) It can effectively improve the screening efficiency of the vibrating screen. The screening efficiency of which is 20% higher than that of metal screen net.

2) It has a better wear resistance and longer service life. The average life of the metalloid screen is 25 times longer than the metal mesh.

3) It can also reduce the installation time, which improves the operation rate of the equipment. Due to the non metallic material screen greatly prolonging the service life of the screen surface and reducing the number of its replacement, the equipment operating rate of metalloid screen is generally 15% higher of the metal screen.

4) It can reduce noise, improve the operating environment. When working, the metal screen not only generates sympathetic vibration with the screen box, it also produce some fibrillation, which will be more obvious after its worn. Moreover, the rigid collision of the materials with the box surface and the vibration of the other components, which all will cause high noise. However, the metalloid screen is a whole screen plate, which has the certain buffer effect and can reduce the noise to about 20dB.

18-02-2012 om 03:53 geschreven door annazhao356  

Hammer crusher is applied to crushing medium hard and weak corrosive materials. Hammer crusher crush materials mainly by the shock effect to the materials. Crushing process is roughly like this: materials enter into the crusher, and then are hit by the hammer with high-speed rotation. The broken materials obtain kinetic energy from the hammer, and then run toward the baffles, sieve article. At the same time, materials impact each other, and been repeatedly broken, some of the materials discharged from the gap of the sieve article, and some bigger materials will be impacted, grinded again by the hammer, and become the products with required granularity.

Disadvantages of the hammer crusher: The hammer and the sieve article wear easily, especially crushing hard materials. When crushing sticky materials, the sieve article will be stocked by the materials, and will cause downtime. So the moisture of the material should not exceed 15%.

The existing problems: The original machine adopts double screen frame, but because of the middle demi-screen frame directly bears the impact from the rotor and the chalk,which leading a larger worn of the middle and less worn on both sides.After the the excessive worn of the middle demi-screen leads the frame installation insecure and usually appearing the phenomenon of loose and peeling,which will cause a number of maintenance work.What's more, the worn middle screen frame equals that the screen of about 14% of the material area were backed up, the broken qualified limestone in here can't be put out, part of the chalk in crusher is repeatedly broken, leading to a low efficiency of broken, the time of yield is not high.

The improving measures: 1)Remove the middle demi-vice screen frame and change the original double screen frame to a single one and then change the article screen of the original 2 to 1 root the root article screen. 2)The material of the article screen remain unchanged then integrally cast a strengthen rab in the middle of the article screen to increase strength of the article screen. 3)And keep the turning circle distance of the hammer between the article screen invariant after the transformation.

The effect of the improvement: Due to removing the middle demi-vice article screen frame,the qulified limestone coal pulverizer through the screening area increased 14% or so of the article, and improve the crusher of crushing efficiency to a production increased to 65 ~ 75 t/h.The limestone of former 2.4 kWh/t power consumption has been reduced to 2.0 kWh/t.For every vice hammer gravel only 15000 t but after reform because of the increased production, 25000 t just needs to change the gravel 1 vice hammer.

And the service life of the article screen frame and screen than before technical article extended for six months.Because of original article is easy to wear a sieve ,which leads the machine often to repair and a number of maintenance work and affect production.The problem has been solved after the reformation,and every month it will save 2 package stainless steel rod.

18-02-2012 om 03:53 geschreven door annazhao356  

There is an report about China mining machinery industry output: According to the information, the gross industrial output value of the metallurgical mine machinery industry in China has reached 177.993 billion RMB this 1 ~ 6 month increasing at 24.95% over the last year.

The automation,large-scale technology and energy-saving technology of the crushing screening equipment will be the key topic of the researching in crushing equipment manufacturing enterprises in the future.Mining crushing screening equipment is the important equipment of the industrial raw material and energy production. And the improving efficiency will be the important part of the energy saving and the resource saving.

With the closing of the large number of small metallurgy, small coal mine, small cement enterprise, large new concentrator, large coal and large cement plant were generally built, which means the higher request of of the washing and dressing equipment was raised. The equipment of great processing capacity, high crushing screening efficiency and reliable operation is in urgent need.The commonly used crushing screening equipment include mobile crusher, cone crusher, jaw crusher, impact crusher, vertical impact crusher, vibrating screen, sand washing machine, the feeder and so on.

Experts in the field of mining equipment and machinery are pointing out that high-efficiency and energy-saving is the developing trend in this industry.

For instance, opencast working equipment is developing for the high-reliability, energy-saving, high-comfort, auto-operating condition surveillance and auto control, which adopts many methods, such as power supply by controllable silicon, timing by AC frequency conversion, concentrated lubrication by grease, shock absorption, pressure and purification in the cab, air conditioner and noise elimination.

The development of high-new equipment requires plentiful functional materials and the application of modern fine crushing technology has become an important symbol of embodying the technology level.

For the washing equipment, all the countries are exploring the new way to meet the separating requirement of diversified minerals and different impurities and make the separating equipment developing for high-efficiency and diversification. The high-efficiency concentrator substitutes the common concentrator in some fields and the new filter will develop quickly, such as auto-filter press with extrusion die and the horizontal belt filter.

18-02-2012 om 03:53 geschreven door annazhao356  

The natural sand has several disadvantages compared to artificial sand, which make artificial sand become the mainstay of stone-production in the field of construction. Pulled by the need of expanding domestic demand, infrastructure investment, such as roads, railways etc, is increasing. Such large engineering project needs lots of high quality sand. However，natural sand is non-renewable resources, with the large-scale exploitation, is increasingly drying up. In such a scenario, artificial sand is seen as a welcome alternative to natural sand. The application of artificial sand will effectively make great contribution to the development of our life. In the process of sand maker production, sand making and impact crusher g equipment is necessary. The raw materials mainly are granite, limestone, basalt, pebbles etc, through a series of crushing and screening equipment in order to reach required level.

Artificial sand is widely used in road construction, concrete industry, etc. As the field of industry application gradually expanded, the gradual application of natural sand work more and failed to keep pace with the various sectors of modern world development needs. For the most part, artificial sand is produced to meet the great needs. More advanced sand making machines have been invented to push forward human civilization. Now here you can learn more about the mechanism of the advantages of artificial sand.

(1) artificial sand suitable for large-scale factory production. Can build a complete management system, responsibility for security, quality, accountability, quality control laboratory is responsible for sand.

(2) pre-mining companies can mine reserves, the quality of exploration. May, according to the specific circumstances of mining plans, you can night a continuous and stable development of space. This has changed now that natural sand mining plan, no month temporary state.

(3) the strength of artificial sand, including weathered rock, soft rock small, clay (block) the amount of screening can be manually controlled. Chemical composition of base metal, stone line, no negative effect on the concrete, suitable for high-strength concrete and high-performance concrete.

(4) mechanisms of sand particle size distribution, fineness modulus selective, different lithology choose a different crushing machinery, in order to achieve certain targets, some equipment is adjustable.

(5) mechanism with a certain amount of powder sand, clay powder and the composition of these different size are also different, role in the concrete are also different. Mud and powder fineness, even though there is less than 0.075inl / 1, but coffee mud particles mostly less than 0.016, while the powder particles, mostly in 0.01640.075inl / 1 between (a difference of about 4 times). Mud is harmful substances, an appropriate amount of powder is useful, it can allow the cement to fill, the gap between fine sand, sand and easy to make up the mechanism of poor shortcomings.

(6) artificial sand mixing concrete density, frost, permeability, suitable high strength, high performance concrete pumping.

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Normal use guarantee jaw crusher continuous work normally one of the important factors, improper operation or do some exercises in the process of the careless, is often cause equipments and personal accident important reasons. The correct operation is strictly according to the provisions of the operation procedures.

Before the start of the preparation: in the jaw crusher, must on the equipment before start full check carefully: check the broken tooth board wear, adjusted the row of ore mouth size; Check for broken cavity ore, if there is a chunk of ore, must be removed. Links are loose bolts; Pulley and the protection of the flywheel outer garment is complete; The triangle leather belt and ties of spring is the right degree of elasticity; Storage tank (or dry oil storage for the amount of oil) oil filled with degree and lubrication system in good condition; Electrical equipment and signal system is normal, etc.

In the startup crusher, should first start before oil pump motor and cooling system, the three to four minutes, when oil pressure and oil, then start when normal indicator of the crusher motors.

Later, after the launch of starting crusher over a period of time, the workshop can start to run for ore equipment. The crusher of ore to should be gradually increase until full operation.

Operation must be paid attention to, not even ore minerals packed with crushing cavity, and give a crazy piece of the largest size should not be more than 0.85 times width mouth to mine. At the same time, to defend excavator shovel teeth of ore and rig drills have not broken objects into crusher. Once found that these objects into the broken crushing cavity, and through the machine row, ore mouth shall immediately notify the belt transport in time, lest post out into the next paragraph crusher, cause serious equipment accidents.

The operating process, often pay attention to big ore blocks stuck to mine the mouth, crusher if has stuck, be sure to use iron hook to flipping ore, if the bulk ore from breaking out of need cavity, should by special appliance, rigorous hand to work on these, lest produce an accident.

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Ball mill came out during the early 1800s; 1870 within the grinding mill, depending on the progression of a uniform size marker rod mill; in 1908 it made a self-mill without grinding mass media. 30-50 years the 20th hundred years,Jaw crusher, the us and Germany allow us a roll bowl mill, roller mill as well as other vertical type disc pulverizers. In 2010 is mine mineral processing equipment just as one essential section of the ball is a bit more rapid growth and development of the.

Ore testing ore beneficiation test work, according to the mineral processing equipment test results to determine the degree of difficulty of the ore optional beneficiation methods and determine the application sorting process, sorting conditions and may reach the election Do not index. Not only can improve the efficiency of ball mill grinding, and reduce energy consumption. The rise of the domestic mining machinery industry is growing rapidly, the ball mill equipment can be considered large-scale machinery and equipment in the mining equipment, manufacturing of the cost of energy-saving ball mill is relatively high, hematite ball mill equipment sales price The reason why such a high, mainly due to higher or more complex internal structure of the ball mill equipment, high technical content in the process of production and processing also led to the price of the ball mill equipment.

To coarse grinding of materials inside first position as soon as the board from the single compartment in the second warehouse, the warehouse lined with flat lining, steel ball inside,rotary dryer, the fabric to help expand grinding. Powder discharged over the discharge grate plate to accomplish the grinding operation. Structural characteristics of ball mill through the feeding part, discharging Department, Rotary Department, Transmission Division (reducer, small transmission gear, motors, electrical control) along with other major components. Hollow shaft with steel casting, lining Exchangeable, slewing gear hobbing by casting method, our bodies inlaid canister liner wear, has good wear opposition.

Ball mill energy consumption for the duration of work landed a lot of the whole means of cement production, including power usage, integrated power usage of cement is the reason about 60% -70%, so

how big is the force utilization of 'downsizing' is really a cement technology workers unremitting goal. Grinding equipment selection, according to cement and concrete properties (performance,mechanical properties, durability) since the core, not simply the quest for the development procedure for reducing power utilization, and also to satisfy the requirements of building economical.

'Standard density is low, a great ingredient being compatible, well age, high strength, assist in improving the longevity of concrete will be the high quality of cement concrete.' As well, also ensures the roll-out of admixtures industry view, 'admixture of cement industry is effective in reducing the necessary particle certain to help the performance of cement plays a crucial role.'

The development of ball mill ultrafine technology is a heavy responsibilities, but I believe in the near future we will have our patent, we will overcome every difficults in mining machinery, our own plug will be on the way of the mining machinery.The ultrafine technology of ball mill must be brilliant tomorrow!

18-02-2012 om 03:52 geschreven door annazhao356  

Ball mill load is the most important parameter optimized in the Ball Mill Pulverizing System (BMPS) in Thermal Power Plant. The accurate measurement of ball mill load is imperative and difficult. The approach based on self-adaptive feature extraction algorithm for noise signal and LS-SVM model is proposed to achieve this purpose. By analyzing the sensitivity distributions of working condition transitions, the characteristic power spectrum (CPS) is obtained. Then the self-adaptive weights can be calculated based on the CPS and the centroid frequency. The extracted features of the mill noise using this method show good adaptability to working condition transitions.

No-load test is not installed in the media (balls, rods), and material circumstances idling. Continuous operation of not less than 4h, generally run 8 ~ 16h, according to specific circumstances. The longer the test, the main bearings, gear tooth surface the better the research together.

Several no-load test should meet the following requirements:

1) the normal lubrication of lubrication points, there is no leakage.

2) mill main bearing temperature should not exceed 50 ℃.

3) mill smooth operation, no abnormal noise gear drive.

4) no loose liner and the transmission parts.

5) meet the maintenance requirements of running ministries.

When the required idle time, stop the mill running, carefully check all working parts, liner bolts tightened to eliminate the defects found.

After passing through the no-load test, load test before proceeding. To gradually feed the load test until the full load. After feeding in the normal operation of 10 ~ 20 h.

Load operation should meet the following requirements:

1) work smoothly without periodic sharp vibration.

2) The main motor current no abnormal fluctuations.

3) the normal lubrication of lubrication points, the main bearing temperature does not exceed 60 ℃.

4) mill working part of the bolt into the hole, the flange surface and the seal with no leakage, leakage pulp and so on.

18-02-2012 om 03:52 geschreven door annazhao356  

PX Series Sand Making Machine incorporates three crushing styles; feeding style incorporates material on material, materials on iron and falling at sides. Customers can adjust the machines according to their own demand. PX Series sand making machine realizes multiple functions in one machine, which is a big breakthrough in sand making field.

Better quality and high efficiency:

1. Better design of the impellers reduces the resistance of materials, highlighting passing through quantity of materials and crushing ratio, so the efficiency is raised by 30%-60% compared to traditional machines.

2. Hydraulic system allows automatic uncovering, which reduces labor intense and makes maintenance easier.

3. The mainframe adopts new techniques, which strengthens the machine structure and tenacity, and ensures stable performance. The quality of the machines is lift to a higher level.

4. PX Series crusher employs world advanced light oil anti-leakage device. This saves the trouble of changing oil seal.

Excellent performance and long service time:

1.Special light oil lubrication systems ensures the temperature to be within 25℃;

2.Brand new automatic protection device provides the machine with vibrating, oil filtering and warning system;

3.New type oil flitting system ensures the bearings and other transmission system are not abraded and prolong their service time;

4.Choosing wearable materials prolong the service time of the machine by 40%, so the cost is lower by more than 40%.

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Different drilling and blasting strategies to improve blasting efficiency have been evaluated．The results of each strategy were compared by means of visual site investigation after blasting and calculating the total cost perton ofthe broken rock． Site investigation had shown that the third strategy had overcome the problem of unexploded ANFO．Unexploded ANFO was not seen after the blasting．and also visual inspection showed significant decrease in the number of oversize boulders．Another proper approach to evaluate different strategies is a comparison of unit production costs．

The stone-making production line produced by our company can provide you with all-around technical support. The whole line consists of vibrating feeder, jaw crusher, impact crusher, vibrating screen and belt conveyor. According to specific requirements, we can combine different models together to meet various needs.

Since the Objective is to minimize the production cost of per ton rock，then the resulting cost of each strategy should be calculated．For that reason，the comparable costs were estimated．Th ese are drilling cost，blasting cost and secondary breaking(hydraulic hammer)cost．

In this quarry，the required size of broken rock should be provided before loading for hauling．Th erefore a hydraulic hammer iS used to break oversize boulders.In order to estimate the drilling and secondary breaking cost of per ton limestone，the unit cost of driller and hydraulic ham er has been estimated as $／h that includes ownership and operating costs．The results were 54．1l$／h for driller and 44．46$／h for hydraulic ham er．Then the total working time of driller and ham er had been recorded for each blasting．Since the production of each blasting had been found by weighting，the unit production cost was calculated by multiplying the total working time with the unit cost of equipment and dividing the result by total pro—duction．The blasting cost consisted of the cost of ANFO．The summ ary of the resuits is given in.

18-02-2012 om 03:52 geschreven door annazhao356  

Crusher hammer abrasion condition is affected by numerous factors, such as material prosperities (including feeding size, material type, hardness, moisture, temperature), hammer linear speed and the gap between grid plate. Therefore, it is very important to choose suitable material for crusher hammer. After long-term practice and experience, the experts of Henan Hongxing has got conclusions and given the following suggestions in the relationship between crusher hammer materials and crusher types.

For large scale crusher with a feeding size of over 400mm, it is should be installed big crusher hammer with a weight of 50~125kg. Owing to crusher hammer needs to bear huge impact force and high manganese steel has high toughness, Hongxing experts suggest that manufacturers had better choose super high manganese steel alloy or alloyed high manganese steel to process crusher hammer.

For small crusher with a feeding size of less than 50mm, it is should be installed complex hammer with a weight of 15kg. Owing to crusher hammer needs to bear smaller impact force, Hongxing experts suggest that manufacturer had better choose medium carbon alloy steel to process crusher hammer, whose head is made of high chromium iron and its handle is made of 35# steel or low alloy steel.

For small and medium size crusher with a feeding size of less than 200 mm, it is should be installed crusher hammer with a weight of less than 50kg. Owing to crusher hammer need to bear relative small impact force, Hongxing experts suggest that manufacturer had better choose high carbon alloy high manganese steel or medium and low carbon alloy steel to process hammer.

For fine hammer with a feeding size of less than 100mm, it is should be installed fine crusher hammer which is made of super high chromium iron. Owing to high chromium iron’s hardness HRC60and its impact toughness ak8J/cm², the service life of fine crusher hammer is improved by three to five times than that of high manganese steel hammer.

17-02-2012 om 03:46 geschreven door annazhao356  

According to the trial research of many kinds of crushers, Hongxing found out that jaw crusher has the following several significant features for limestone crushing:

a)The production capacity of jaw crusher is 600 ~ 800t / h, which is 25~40 times the capacity of the original limestone crusher. Hongxing jaw crusher has solved the problem of high operating efficiency and no maintenance time caused by low capacity for original limestone crusher.

b)Jaw crusher can crush large-sized limestone, and the maximum crushing size is 1000 × 1200mm.

c)Fine final product size, only 2 ~ 15mm.

d)Good uniformity of two materials, and the mixing amount of desulfurization limestone has greatly increased. The current mixing amount can reach 60%, which can effectively reduce the cost of raw materials.

e)Low power consumption. 1 ton of limestone can save 1-2KWh/t power, and the annual electricity savings will be 100,000RMB.

f)Effectively improved the labor intensity and work environment.

PE series jaw crusher of Henan Hongxing can be classified into primary and fine crushing. PE and PEX series jaw crushers are widely used for the primary and secondary crushing of various kinds of ores and rocks with the compression strength no more than 320Mpa in mining, smelting, building, highway, railway, water conservancy, chemical industry etc. With the feeding size 125mm ~ 1020mm, jaw crusher is the preferred primary crushing equipment.

As China’s famous high-tech manufacturer of crusher, sand making machine, cement grinding and wear-resistant materials, Hongxing has taken the lead in manufacturing large crusher, stone crushing line, and large sand-stone production line. With complete specifications, Hongxing jaw crusher can crush any materials that you want to, and will be the best choice for you to crush hard and strong abrasive rocks or recycling waste materials.

17-02-2012 om 03:46 geschreven door annazhao356  

Traditionally, the impact crusher is one of the crusher specially used in burning lime. Although the impact crusher is with the characteristics of big crushing ratio, the wearing parts is easily worn owning to the impact of the plate hammer, which causes the increasing cost of wearing parts as well as the reduction of the crushing amount. As with this phenomenon, Zhengzhou wear-resistant materials research institute make efforts to upgrade the technology of the board hammer, impact scaleboard and other components.

As we all know, the worn of the impact crusher plate hammer only appeares in the side facing materials. When the rotor rotate at a normal speed, the feeding materials will fall to the board surface of the plate hammer, it won't be worn the plate hammer back and flanks, even the side facing material wear also rarely. But when the rotor rotate at an abnormal speed, the plate hammer will be worn easily.

The former board hammers are usually made from high manganese steel, which is suitable for crushing materials with medium hardness, but when it crush such as basalt, diabase, biotite, granite and other high hardness materials, the plate hammer must have good corrosion resistance as well as high wear resistance. Nowadays, the generally used plate hammer is mainly made by high chromium cast iron, and high chromium content means relatively good toughness. However, high chromium cast iron brittle and its high price promotes the continuously research of new wear-resistant materials.

Reportedly, after many experiments as with the crushing characteristics of impact crusher, reasonable application the most advanced nanotechnology, experts of Zhengzhou Materials Institute has developed the new casting wear-resistant materials whose sexual price is at present 1-2 times higher than the general materials, which compared with similar imported products, semi solid extrusion hypereutectic high chromium plate hammer has the advantages of high security, high wear resistance, low in price and greatly shortened delivery cycle.

At present, the application of the semi solid extrusion hypereutectic high chromium material is still in initial stage, and the wear plate hammer manufacturers in China can be counted on one's fingers. However, once this kind of wear-resistant materials become mature and widely applied, it will promote the development of crushing machine especially the development of impact crusher with strong wear-resistant material dependence

17-02-2012 om 03:45 geschreven door annazhao356