crushing plant flowsheet & design-layout

crushing plant flowsheet & design-layout

In the crushing section, the ore as it comes from the mine is broken down dry to a size suitable for the wet grinding machines ; these can, if necessary, be made to take lumps of 2-in. size, but they work much more efficiently if their feed is in. or less. Before the advent of the Symons cone crusher the usual practice was to make a 2-in. product in two steps consisting of a primary breaker of the jaw or gyratory type followed by a secondary gyratory crusher. If anything smaller were desired, a third stage was added comprising coarse crushing rolls in closed circuit with a screen. The Symons cone crusher, however, will take the discharge of the primary breaker and crush it to 3/8-in. size in one pass more cheaply and efficiently than is possible with rolls. A screen is usually placed ahead of the cone crusher in order to bypass material that is already small enough and so to relieve it of unnecessary work, but there is no necessity to screen the discharge, as must be done in the case of rolls; the crushing elements are so designed that the finished product is made in one pass through the machine.

Modern practice, then, is to crush the ore as it comes from the mine in two steps to a maximum size of without the use of water except as a spray to remove dust. Three stages are only needed if the primary machine is called upon to take lumps of exceptional size, such as are encountered when mining is done by power-shovel. Since this material is very difficult to handle through a bin gate, it is usual to feed it direct to a specially large preliminary crusher, often of the jaw type, which breaks the ore to a size small enough to enter the normal primary crusher.

The ore from the mine is dumped in the coarse ore bin, from which an automatic feeder delivers it over a grizzly to the primary breaker, the latter being of the jaw type in the case of a small plant and of the gyratory type in the case of a large one. The reduction ratiothat is, the ratio between the inch size of the largest lump entering the machine and that of the largest piece leaving itis usually between 4 and 6 to 1 for either machine.

The undersize of the grizzly joins the product of the primary breaker and is transported by a belt conveyor to an intermediate bin, from which an automatic feeder delivers it to an elevating belt conveyor discharging on to a vibrating screen. The screen by-passes any material fine enough to enter the grinding section and delivers the oversize to a cone crusher, the discharge of which joins the undersize of the screen and is taken by a belt conveyor to the fine ore bin ahead of the grinding section.

The fine ore bin can be designed to hold two days supply of ore, but the coarse ore bin should not hold more than one days supply on account of the tendency of large lumps to pack under pressure of a heavy column of ore. The intermediate bin with the automatic feeder and belt conveyor following it are occasionally omitted, but the practice is not to be recommended, since the discharge of the primary breaker then passes straight to the vibrating screen and cone crusher, with the result that the unavoidable irregularities of feed in the first stage pass on to the second ; moreover, the correct rates of feed for the primary and secondary machines are seldom the same. Therefore, as a cone crusher can only be run at maximum efficiency if it is given a regular feed at approximately the correct rate, it is best in the interests of efficiency to retain the intermediate bin.

A group of several automatic feeders at intervals along the length of the bin are sometimes required to keep the larger sizes of gyratory crushers running at full capacity. The layout of a large installation, especially one with several primary breakers, is consequently not always quite as simple as the foregoing description would indicate on account of the greater complexity of the conveyor system. The usual method of handling the ore is to arrange for each group of feeders to discharge on to one particular apron conveyor running parallel to the bin under the projecting ends of the feeders; the conveyor in turn discharges on to a belt conveyor which elevates the material to the appropriate primary crusher. It should be understood that the limiting factor is the maximum possible height of the bin ; an automatic feeder can be made big enough to supply the largest crusher, but it is not always possible to providesufficient bin height to give the necessary storage capacity overa single feeder. A longerbin with a greater number of feeders is therefore the usual alternative.

For three-stage crushing, the preliminary stage is frequently a duplication of the first step of the two-stage arrangement shown in Fig. 1, but it is not uncommon for the first machine to be placed near the scene of mining operations if the mine is situated at a considerable distance from the flotation plant.

The advantages of producing a fine mill feed have been recognized for many years. The extent to which fine crushing can be carried out will vary and depends on the ore characteristics, plant and crusher design. Unfortunately, the ore characteristics are generally beyond our control, so the concentration of effort lies primarily on the plant arrangement, equipment design and operation. Where fine crushing should stop and grinding begin is controversial and is influenced greatly by personal opinions and experiences. Often, this break point will be different if consideration is being given to a new plant in comparison to a modest expansion. Most new plant designs employ the largest and most efficient equipment. The modification of existing plants becomes more complex because of the space requirements and the related equipment already in operation.

As the need for finer crushing increases, consideration must be given to the achievement of maximum crushing and screening efficiency. The majority of crushing plants recently constructed have accomplished this desired efficiency by optimizing plant design, crusher design and automation. By improved efficiency a decrease in energy consumption per ton of crude milled should be achieved. Further savings resulting from finer crushing are realized in the concentration or mineral recovery phase of a process. These benefits are rather difficult to quantify due to the varying complexities of the concentrators and benefication processes. Relatively clear and measurable are the metal and maintenance costs and the ever increasing cost of energy. Metal costs in the form of crusher liners have not quite doubled in the last 20 years, while power costs have increased by a factor of four or five depending on the region considered. Estimates made only a year ago on the increased cost of energy are obsolete in view of the recent unstable conditions in the Middle East. Since power is, therefore, becoming the largest cost area, it behooves us to investigate potential cost saving methods in the form of lowering the KWH/TON of crude. This discussion will confine itself to conventional crushing and grinding existing technology and equipment.

To reduce run-of-mine to mill feed requires reduction in a series of stages. The physical size and power requirements of a crusher capable of reducing hard rock vary depending on the application. Extended experience in most crushing plants show that a minus 19MM () rod millfeed can be and is being produced in three stages of crushing. In the majority of cases, the last crushing stage is closed circuited using anywhere from 10MM (3/8) square to 14MM (9/16) slotted openings on the sizing deck. In some copper concentrators, the mill feed is all passing 13MM(), using three stages of crushing and 14MM (9/16) square openings on the closed circuit screens. It was felt by some that crushing to this fine size is only possible if the ore is friable and is relatively soft in comparison to the harder ores. Our results show that some of the copper ores are as hard as taconite and are crushed to ball mill feed all passing 13MM ().

Even when a crusher has the capability of achieving a high reduction ratio it is normally more efficient to run the crusher at a mid-setting, as shown in the manufacturers tables, rather than choosing the closest setting which offers the greatest reduction ratio. The main consideration at each stage for maximum production is efficient power draw.

There is an optimum setting for each crusher and an optimum number of stages required for maximum plant production based on the individual characteristics of the material being crushed. Overloading the crusher does not increase production, but instead is counterproductive and will decrease the lives of the crusher components. Ideally, the topsize feed should receive four to five impact blows during its progress through the crushing chamber. This is a combination of reduction at the upper zone of the liners as well as the parallel zone. The crusher should be fed so as to be operating at or near continuous full load horsepower capability. Operating the crusher at too narrow a setting decreases capacity and creates high wear. Too wide an opening, in proportion to topsize feed, will prevent crushing in the upper zone and will develop excessive power draw. Power drawn per ton of crusher feed is not in itself a measure of productivity. Efficient use of power through proper application of the cavity, with respect to feed and product requirements, will determine the optimum production per horsepower drawn. From the following crusher application descriptions, it can readily be seen that each crusher has its own designed level of reduction. The range of feed sizes and product sizes, for each crushing stage, somewhat overlaps into the succeeding and preceding stages. This allows for flexibility in adjustment at each stage for optimum production of the entire system.

Primary Crusher: The Primary crushers main purpose is to reduce large fragments of blasted or natural rock down to a size suitable for handling by transfer equipment and the secondary stage crusher. Feed opening and product size ranges for the various models or Gyratory crushers are as follows:

Standard (Secondary) Cone Crusher (Refer to Fig. 1): The Standard Cone crusher is normally applied as a secondary crusher in a multi-stage crushing circuit. The small diameter feed distributor and the wide throat opening at the top of the liners enable the Standard Cone crusher to accommodate the larger feed produced by the Primary crusher.

The feed to the Short Head Cone crusher is normally screened prior to the crusher to remove the finished product sizes and to provide void space for the crushed particles produced in the cavity. Maximum production will be obtained when the crusher operates at or near full horsepower load continuously. To achieve this condition, plant design, feed distribution and the type of crushing cavity are factors which warrant considerations. The schematic arrangement shown in Figure 3 permits the crusher to operate with a controllable feed rate. The circuit shown in Figure 3 offers the optimum in crusher feed control and automation. The new feed is withdrawn from the bin directly to the crusher assuring a steady, controllable feed race. In a properly fed crushing cavity the material is distributed in a manner which utilizes the entire circumferential area of the receiving opening. It is equally important to have the finer gradations in the feed interspersed with the coarse feed.

Gyradisc crushers are specialized reduction machines. They are designed to economically produce large quantities of cubical product from stone, gravel, ores and non-metallic minerals. The feed for Gyradisc crushers usually has a topsize not larger than 75MM (3 In.) for the larger units and 30MM (1 In.) for the smaller size crushers.

Gyradisc crushers differ from conventional cone-type crushers because the comminution of material is achieved by a reduction process called Inter-Particle Comminution. The principle of reduction utilizes a combination of impact and attrition of a multi-layered mass of particles.

Through proper application of the Gyradisc crusher, mill feeds of 100 percent passing 3, 4, and 6 mesh are attainable. The crushing action of the Gyradisc crusher results in circulating loads of less than 50 percent of the new feed rate when closed circulating on 3 mesh, to 150 percent when closing the circuit on 6 mesh.

Reference is now drawn to the importance of screening in the success of the crushing circuit. It is not just the crushing of the ore but the extraction of the mill feed size that makes the circuit complete. A sufficient quantity of vibrating screens and full utilization of the total area they provide is an important factor in economically producing the mill feed size and tonnage established for the plant.

Optimum performance of a vibrating screen is dependent upon selection of the proper screening surface. Proper screening surface might be interpreted differently by the screen manufactured, the surface supplier, and/or the operator; however, if approached from a practical standpoint there is one significant controlling factor to guide us in the selection of all screening surfaces. That is percentage of open area. With surface life being an important factor in the selection of the type of opening used, the rate of undersize extracted will be related to the percent of open area.

Charts were developed by vibrating screen manufacturers to be used as a guide in determining the size of screen required for a specific application and/or capacity capability of existing screens. Each manufacturer establishes capacity rating for specific operating conditions but use adjustment factors to compensate for variations in these operating conditions.

Differences in the amount of oversize, undersize, half size, etc. are the common adjustments to suit actual operating conditions. Overlooked and often forgotten by many of us is the effect of the screening surface on screen performance. The screen manufacturers basic capacity rating is normally established for square opening woven wire screen cloth having a specific percent of open area. In addition, the supporting beneath is designed to provide maximum open area for woven wire cloth.

This formula was originally intended to apply and be meaningful when substituting wire cloth with a smaller or larger wire diameter. There may be additional obstruction of open area when mounting perforated plate, rubber, polyurethane surfaces on supports designed for wire cloth. This is not compensated for in the above formula. Of course, there is also the danger of structural instability when mounting the heavier surfaces on supports designed for wire cloth.

Installing heavier surfaces may also cause a reduction in screen throw and unless it is compensated for the reduced action will result in very erratic and inefficient separations regardless of the open area.

There are already so many factors to deal with in every processing plant. Moisture, particle shape, uneven feed distribution, surge feeding, and excessive feed rates all of which are detrimental to maintaining high screening efficiency. Conditions are more unfavorable when a decrease in open area is added to this list.

Another factor enters the picture in recent years and that is rubber and polyurethane type surfaces are not always used just to extend the life but tend to dampen noise when compared to surfaces of steel construction. Often changes in surface specifications are made without a thorough evaluation of the consequences. There is often need to compromise by weighing the advantages against disadvantages of each type of surface with the major or final consideration being the actual cost per ton of mill feed extracted from the circuit. The table showing the capacity adjustment factor is useful in calculating screen are requirements when alternate surfaces are being considered.

This practice has been followed successfully in several Minnesota taconite installation. The secondary crusher product is screened and conveyed to bins ahead of the tertiary crushers. The tertiary crushers operate in either open or closed circuit with a variety of arrangements available in positioning the tertiary screens. The screens can be placed above or below the tertiary crushers or in a separate screen house. With the advent of automatic crusher feed control systems it becomes important to reduce the reaction time between the feed control mechanism, such as a vibrating or belt feeder, and the crusher, to a minimum.

Where secondary and tertiary crushers are stacked with a scalping screen between the two, surge and feed control for the tertiary crusher becomes more difficult. This results in lower efficiency from a power utilization standpoint. The initial cost of construction for this type of plant is usually lower than theaforementioned horizontal layout.

The positioning of the secondary and tertiary crushers depends on a variety of factors including terrain, moisture level in the ore, storage capacity both before and after fine crushing and benefication steps.

Usually the fine crushing plant is located some distance from the primary with an intermediate ore storage facility between. The operation of the fine crushing plant is independent, to a large degree, of the performance of the primary crusher.

A great deal of thought has been given to the problem of attaining maximum efficiency in this type of operation. Efficiency is measured by the work of reduction on the ore per unit of time and by percent running time. The work of reduction is represented by tonnage of throughput and degree of size reduction.

To attain the maximum work of reduction, each crusher must be kept at full capacity. The capacity may be limited volumetrically in the case of softer ores, or by the horsepower that can safely be applied to the crusher in the case of harder ores.

stationary crushing plant - aimix concrete batching plant

stationary crushing plant - aimix concrete batching plant

Raw Materials Applied: 1. Non-metallic mineral: limestone, river stone, marble, quartz, granite, basalt, etc., 2. Metal ore: iron ore, gold ore, copper ore, aluminum ore, manganese ore, lead and zinc ore, etc. 3. Construction waste

Crushing plant is also called crushing and screening plant, it includes sand and gravel production line, stone production line, silicon sand production line, construction aggregate production line. Our stone crusher plant are engineered to deliver unrivaled productivity in mines, quarries and civil engineering projects. We offer advanced, proven crushing and screening equipment for any size-reduction challenge. Whether youre producing several sized aggregates or crushing tons of hard rock ore, our solutions deliver the robustness and versatility you need.

Furthermore, it has been proven by many practices that the crusher plant is also particularly suitable for processing construction waste, and will lead the process of recycling construction waste in the future.

The crushing is generally divided into three steps: 1. The first step of crushing: the input size 1500 500mm, the output size 400 125mm 2. The second step of crushing: the input size 400 125mm, the output size 100 50mm 3. The third step of crushing: the input size 100 50mm, the output size 25 5mm.

We have the concept of ecological environmental protection, we promote the use of new technologies for noise reduction, dust reduction and wastewater treatment. We research and develop technologies and products for the comprehensive use of waste, and we develop a circular economy.

Aimix crushing plant mainly include statioanry crushing plant and mobile crushing plant. stationary crushing plant includes Jaw Crusher, Cone Crusher, Impact Crusher, Sand Production Line or VSI Crusher, Feeders, Screening machine and Washers, etc.

Spring system for overload protection, no damage to the machine. Adopted grease seal to isolate dust and lubricants, ensure reliable operation. Standard type, medium type and short head type to choose.

Advantages of Aimix Cone Crushers: 1. reliable structure and low cost operation 2. laminated crushing shape, excellent shape of end products; 3. Its spring safety device acts as an overload protection, when iron or other strange tidal flow passes the crushing chamber, no damage will be caused to the crusher; 4. The glycerin seal is used, which isolate the dust from the lubricating oil, which guarantees reliable operation.

Attention: Hard materials can not be crushed, such as basalt, granite, river stone, etc. Normally impact crusher is used for crushing of materials that are not very hard say soft material and materials that are non-abrasive. For example limestone, coal, gypsum, seeds etc.

Features: 1. The hammer, the impact plate and the protective plate are made of new wear-resistant materials, which are resistant to impact and wear. 2. The shape of the final products are good. With easy adjustment between the impact plate and the hammer, an effective control of the output size. 3. With reasonable hammer structure, it has the characteristics of fast dismantling and multiple transposition, which can considerably shorten the time to replace the hammer.

Advantages of Aimix Impact Crusher: 1. The hammer, the impact plate and the protective plate are made of new wear-resistant materials, which are resistant to impact and wear. 2. The shape of the final products are good. With easy adjustment between the impact plate and the hammer, an effective control of the output size. 3. With reasonable hammer structure, it has the characteristics of fast dismantling and multiple transposition, which can considerably shorten the time to replace the hammer.

heavy media vessel coal preparation plant

heavy media vessel coal preparation plant

For each project scheme design, we will use professional knowledge to help you, carefully listen to your demands, respect your opinions, and use our professional teams and exert our greatest efforts to create a more suitable project scheme for you and realize the project investment value and profit more quickly.

The raw coal is carried by conveyor to the preparation plant. Raw coal is distributed to twelve (12) 8-foot x 16- foot horizontal deslime screens where the material is sized at 1 mm. All material larger than 1 mm is sent to twelve (12) 28-inch heavy media cyclones. Clean coal from the cyclones reports to six (6) 8-foot x 16-foot horizontal drain and rinse screens. Refuse from the vessels ...

The DMS process involves three steps: feed preparation, dense medium separation, and ferrous-based media recovery. This paper discusses each of these processing steps, but focus will be given to the dense medium separation stage. Various types of DMS equipment are reviewed. Pilot plant campaign case studies conducted at the SGS Lakefield site are presented, which have included a variety of ...

What Is Coal Preparation? Coal preparation is the removal of undesirable material from the Run-of-Mine (ROM) coal by employing separation processes which are able to differentiate between the physical and surface properties of the coal and the impurities. Through coal preparation.

Prior to feeding coal to the DMV, the correct dense medium is pumped into the vessel through the feed washer manifold and the purge hoppers. The vessel is filled until it is freely overflowing. The proper inflow of medium can be estimated to be 260 gallons/min for every foot of overflow weir length.

Coal People Magazine ost of the time, after coal is mined it must be processed to meet customer specifications before it is shipped. This takes place at coal preparation plants. "The reason we clean coal is that when it comes out of the ground, it still has a lot of minerals in it," explains Barbara Arnold (right), President of PrepTech Inc., who is teaching a workshop ...

A Coal preperation plant, nestled among the mountains. Coal Preperation plants generally use gravity process equipment to separate the refuse from the product (coal). Coal has a specific gravity between 1.35 and 1.5, while the refuse rock has a Specific Gravity of 2.1 to 2.3. Heavy Media is the most popular method of cleaning coarse sizes, jig plants are probably the second most common method ...

COAL MINE FATALITY - On Monday, July 5, 1999, a preparation plant electrician was checking a Square D, Type 6 P Limit Switch to determine why the heavy media vessel motor had stopped operating. Apparently, the victim was attempting to remove/repair the limit switch, which was located on the vessel refuse chute when he received a fatal electrical shock.

Dense Medium Separation (also called Heavy Media Separation) is a well-established density separation process. Dense Medium Separation (DMS) uses the characteristic differences in density of the input material to enact a gravimetric-based separation. Due to the robustness of the process, DMS can be used in the separation of minerals, ore bodies and scrap metals. Dense Medium Separation is .

Abstract. In order to solve the production of refuse with higher calorific value using 2-product heavy medium cyclone in Umlalazi Coal Preparation Plant, South Africa, 3-product heavy medium cyclone was utilized in the retrofit and the separation performance was discussed in this paper.

100 mm x 0 raw coal 150 mm x 0 ROM coal Heavy-media vessel Drain/rinse screen Drain/rinse screen Crushing Centrifuge Desliming bend Screening Cyclone sump + pump Classifying cyclone Fine flotation Coarse flotation Heavy-media sump + pump Heavy-media cyclone Desliming bend/screen Clean coal centrifuge Desliming bend/screen Heavy-media recovery screen Media sump and pump Clean coal .

Static heavy media separation vessels comprise the majority of separations, and include the Wemco drum and cone vessels, the McNally lo flow vessel used in coal and a host of other vessels, which form a structure where separation between two materials of differing densities can take place. Generally speaking, the light density material must differ from the sink material density by a difference ...

Coal People Magazine ost of the time, after coal is mined it must be processed to meet customer specifications before it is shipped. This takes place at coal preparation plants. "The reason we clean coal is that when it comes out of the ground, it still has a lot of minerals in it," explains Barbara Arnold (right), President of PrepTech Inc., who is teaching a workshop ...

Magnetic separator is widely used in coal preparation and mineral processing with particle size is between 0-20mm, to recovery heavy particle in coal preparation plant, and remove iron ore in non-metallic processing. Heavy media content: 87-130kg/m. Recycling Rate: >99.7%. Rotation Speed: 14mrp. Magnetic Intensity: 180/300mt.

upgrade of coal to produce commercially-graded end product(s) as well as the beneficiation of diamonds, iron ore, chrome, andalusite, fluorspar, base minerals, manganese, phosphate and tin, amongst others. The dense media (DM) cyclone has been installed in over one quarter of the coal preparation plants worldwide (Reeves, 2002). de Korte (2000 ...

The partition curve for an operating dense medium vessel can be determined by sampling the sink and float products and performing heavy liquid tests to determine the amount of material in each density fraction. The range of liquid densities applied must envelope the working density of the dense medium unit. The results of heavy liquid tests on samples of floats and sinks from a vessel ...

The partition curve for an operating dense medium vessel can be determined by sampling the sink and float products and performing heavy liquid tests to determine the amount of material in each density fraction. The range of liquid densities applied must envelope the working density of the dense medium unit. The results of heavy liquid tests on samples of floats and sinks from a vessel ...

or through the preparation plant. Control coal blends to meet quality specifications and ship a more consistent, quality product. We offer a variety of Thermo Scientific products that provide you with the information you need to better sort and blend coal. Achieve precise and accurate information through the use of Thermo Scientific coal analyzers, weighbelt feeders, electronic belt scales and ...

HMS and DMS are acronyms for Heavy (Dense) Medium Separation and is applied to the process of pre-concentration of minerals mainly the production of a high weight, low assay product, which may be rejected as waste. In principle it is the simplest of all gravity processes and is a standard laboratory method for separating minerals of different specific gravity. Fluids of suitable density ...

The heavy media cyclone is used extensively in coal processing and in the primary treatment of metal ores such as Pb and Zn. The modern cyclone for coal preparation is the most effective option for size fraction of 0.550mm (Chu et al. 2012).

A Coal preperation plant, nestled among the mountains. Coal Preperation plants generally use gravity process equipment to separate the refuse from the product (coal). Coal has a specific gravity between 1.35 and 1.5, while the refuse rock has a Specific Gravity of 2.1 to 2.3. Heavy Media is the most popular method of cleaning coarse sizes, jig plants are probably the second most common method ...

Coal preparation, or beneficiation, is a series of operations that remove mineral matter (i.e., ash) from coal. Preparation relies on different mechanical operations, which will not be discussed in detail, to perform the separation, such as size reduction, size classification, cleaning, dewatering and drying, waste disposal, and pollution control.

Heavy Media Drum Magnetic Separator in Coal Preparation Plant for Mineral Processing picture from Fushun Ejet Magnetic Equipment Co., Ltd. view photo of Heavy Media Magnetic Separator, Magnetic Mineral Separator, Magnetic Mineral Separator for Coal Preparation.Contact China Suppliers for More Products and Price.

A coal preparation plant (CPP; also known as a coal handling and preparation plant (CHPP), coal handling plant, prep plant, tipple or wash plant) is a facility that washes coal of soil and rock, crushes it into graded sized chunks (sorting), stockpiles grades preparing it for transport to market, and more often than not, also loads coal into rail cars, barges, or ships.

In 2014, there were 252 coal preparation plants operating in the US with an average feed rate of 842 tonnes/h with a range of 2277444 tonnes/h (Coal Age, 2015). Of these plants, 235 were cleaning bituminous coal, while only 17 were cleaning anthracite. There were no plants cleaning subbituminous coal or lignite, because these lower rank coals are not amenable to processing. Low-rank coals ...

This report includes a directory of the coal preparation plants and/or coal rail loading facilities currently located in Western Kentucky. The directory lists prep and rail facilities, operating companies, and detailed locational and operational information. Also, detailed coal rail siding information is shown for each facility having direct rail transportation service. Six coal facilities in ...

20.09.2014 A look at the processing, cleaning and separation process of anthracite coal from inside an operational anthracite coal preparation plant. Like coal mining? Then join the PA world of surface coal ...

The project is a large-scale coking coal preparation plant, with using of Heavy Medium Cyclone and Flotation process, the scale reached 6.0Mt / a, and the construction duration will last 10 calendar months.

The raw coal is carried by conveyor to the preparation plant. Raw coal is distributed to twelve (12) 8-foot x 16- foot horizontal deslime screens where the material is sized at 1 mm. All material larger than 1 mm is sent to twelve (12) 28-inch heavy media cyclones. Clean coal from the cyclones reports to six (6) 8-foot x 16-foot horizontal drain and rinse screens. Refuse from the vessels ...

crushing & screening | quarrying & aggregates

crushing & screening | quarrying & aggregates

Hammer crusher has become a commonly used crushing equipment in quarries and cement plants due to its large capacity and short process. Gyratory crusher is a new type of coarse crushing equipment used in large-scale crushing production lines in mines and quarries. Both are in appearance and principle. It is quite different from the structure.

The main spare parts in vertical shaft impact crusher (sand making machine) are feeder hopper, raw material screen, crushing cavity, impeller, bearing, transmission shaft and so on. Among them, transmission shaft and bearing mainly transport power, impeller and crushing cavity are the main parts to process raw material.

During the production process of rock crusher, the crushing efficiency is not only affected by its performance, but also affected by several other factors. Knowing the factors affect stone crusher crushing efficiency can help investors improve the production rate. In the following part, we focus on factors affect the production efficiency of rock crusher.

Bulk materials are sieved through a process in which one or more layers of screen surfaces are divided into different sizes. The screening of materials on the screen of the vibrating screen can be roughly divided into two processes.

This article will recommend a new type of circular vibrating screen. Its vibration exciter is between the first layer of screen mesh and the second layer of screen mesh. The power source is located above the center of the vibrating screen.

Heavy-duty and superior weight rotor, the weight of rotor of PFW is 1.5-2 times heavier than the traditional rotor. It enhances the impacting strength and enlarge the crushing ratio sharply and also ensure the perfect cubical products shape.

how to solve the dust problem on stone crusher plant

how to solve the dust problem on stone crusher plant

Have you received some complaints from residents about the noise and dust from the stone crusher plant? Many quarry crushing plant has been shut down after residents complained about noise affecting their rest and dust problem affecting their health. It produces a large amount of dust in the production of crushed stone. Which not only pollutes the environment but also harms the human body. How to effectively deal with the dust problem on the production line of a rock crushing plant? Here are four tips that might help.

Improve the process layout of the bag filter and arrange the filter of the crusher according to the direction of the belt conveyor. The standard dust hopper of the bag filter is changed into a double dust hopper structure. We cancel one screw conveyor and raise the bag dust collector, which is beneficial to the arrangement of air inlet pipe (the angle of the air duct is large). The air inlet is equipped with the air inlet box, which makes the dust of the crusher feeding port directly enter the air inlet box of the dust collector. It saves the elbow, reduces the system resistance and improves the dust collection efficiency. The single-layer flap valve is used in the ash bucket airlock, which eliminates the grid wheel feeder and its motor, reduces the secondary dust emission and improves the dust removal effect.

The field conditions restrict the dust emission at the corner of the belt conveyor. The clay groove and dust-removing cover can not change the form of the dust-removing process arrangement. Therefore, the dust-removing cover is in a slightly negative pressure state to control the dust emission of the belt conveyor.

Strengthen the management of dedusting equipment. Checking the sealing of dedusting cover regularly, and deal with the problems found in time. Carry out target management and assessment on post environment and dust emission of the bag-type dust collector. And monitor regularly the dust emission. We should use the economic lever to mobilize the enthusiasm of post personnel to improve the maintenance level of dust removal equipment and reduce dust pollution.

Considering not only the service life of filter material and pulse valve but also the dust in the ash falling place of the ash hopper. In order to improve the comprehensive dedusting effect of crusher and belt conveyor. When crushing the dry material, water can be poured at the material entrance of the crusher as needed (10 ~ 20 minutes after opening the crusher is required).

The types of JXSC stone crushers are cone crusher, jaw crusher, impact crusher, hammer crusher, roll crusher and other aggregate crushers. JXSC is a China mine machinery manufacturers who produce crusher plant equipment, sand plant equipment, mining equipment. We have 40 years of production experience and professional engineers to design a production line. Our engineers also can install the machine on-site for the customers.

The advantages of JXSC Stone Crushers are low noise and little dust which reduces the trouble of dust problems. Its structure is simple, easy to maintain and replace the wear parts, and strong crushing capacity. Our crushing equipment adopts high-quality material, so the parts are durable.

Jiangxi Shicheng stone crusher manufacturer is a new and high-tech factory specialized in R&D and manufacturing crushing lines, beneficial equipment,sand-making machinery and grinding plants. Read More

soybean oil production line, soybean oil extraction plant project

soybean oil production line, soybean oil extraction plant project

The soybean oil production line is the process of treating soya bean with the press method or leaching method to obtain more crude oil and then refined to obtain edible refined oil. Pressed soybean oil has natural colors, aromas and flavors, and retains raw materials various nutritious ingredients when comparing with the leached oil. The physical pressing line requires raw materials to be carefully selected, and the soya bean is pre-treated through cleaning, crushing, softening, rolling and extruding. After that, the cleaned beans are added during the pressing process and the oil is extracted from the pressing machine, and the finished oil is produced by using high-tech physical refining filtration purification technology. The physical pressing method maintains the original flavor of soybeans, rich in vitamin E, and has a long shelf life. And the screw pressed oil has no additives, no solvent residue, and no soap content. Soybean oil pressing line is a combination of modern and traditional technology that produces pure natural soybean oil.

Soybean should be cleaned first. The main purpose of this section is to remove the impurities of soybeans. The impurities are mainly plant impurities (such as bean stems, pods, etc.), metal impurities and non-metallic impurities.

Generally, soybeans are required to be broken into 4 to 8 valves, and the powdery degree (when crushed beans passing through 20 meshes screen) is less than 10%. The crusher is preferably a toothed roll crusher with cutting, impacting and bending effects. YPSG series toothed roll crusher is mainly used for crushing such large granular material like soybeans, so as to produce the excellent embryo and improve the yield. The machine has the characteristics of small noise, high output, uniform crushing granularity, low power consumption, small footprint, simple structure, flexible and reliable, convenient maintenance and so on.

Softening is through the adjustment of oilseed moisture and temperature to improve the elasticity of seed so that it has the best conditions for rolling. Softening is mainly used for seeds with low oil content, low water content, poor physical properties and hard texture. Soybeans have low oil content and poor plasticity, which need to be softened before rolling. Softening temperature should be based on the level of soybean moisture. When soybean moisture is 13%~15%, the softening temperature is usually controlled at 70~80, and the softening time is 15~30 minutes. The commonly used softener for soybeans is a horizontal softening pot, which has a better softening effect.

The material enters the drum through the inlet, and with the rotation of the drum, the material is constantly turned over. Meanwhile, the drum is equipped with a heating tube and steam is passed through the tube, the material is heated, steamed and rotated at the same time. According to the softening condition of the material, the softening time of the material can be controlled by adjusting the rotating speed of the rotary drum to optimize the softening effect.

The purpose of rolling is to destroy the cell structure of oilseed, increase the surface area of seed and shorten the distance of oil flowing out, which is beneficial to the extraction of oil. In order to ensure the quality of rolled flakes, the moisture and temperature of materials before rolling should be strictly controlled.

Soybean extruding is the process of using extrusion equipment to break through the crushed, rolled soybean into porous, expanded granular material. Extrusion is a kind of high temperature and short time processing. At present, the commonly used soybean extruding machine is low moisture single-screw extruder, and the material is extruded by heating, pressing, gluing and vacuum extrusion. Generally, extrusion temperature can reach 110~200, and the residence time in the extruder is for the l~3 minutes.

Oil pressing is a mechanical extracting method by using screw press to squeeze oil out from clean materials under pressure. The capacity of oil screw press is from 1 to 50 tons per day, which are commonly used for continuous mechanical extraction of oil these days, regardless of the size of the operation. There are many factors that affect the efficiency of oil extraction, such as vegetable seed types, temperature, press configuration, etc. Usually, the physical pressing method has an oil output of 65-70%, which is suitable for commercial processors to build small and medium screw pressing oil plant.

Today, the soybean oil is divided into cold pressed oil and hot pressed oil. The cold-pressed soybean oil has a lighter color and a lighter raw smoky taste. The hot-pressed soybean oil has high oil yield due to the high-temperature treatment of the raw materials, but it has a darker color and a stronger green bean odor. Therefore, the commonly used oil screw pressing method is cold pressing: the physical pressing method has irreplaceable technological advancement for the pursuit of green, authentic, healthy food. In order to achieve additional oil recovery, the seed material must be subjected to a longer retention time of high pressure in the screw press. Higher pressure is mainly achieved by lower seed moisture, resulting in high friction in the press. Because of the mechanical strength, the maximum diameter of the press cage is determined. The higher the pressure, the more limited the capacity of the press is. Moreover, the longer the retention time is required, the lower the shaft speed is required. This further limits the capacity. Therefore, the cold press is characterized by a capacity of only 1/10 of the capacity of the modern pre-pressing machine. But cold press machine can screw out 80~90% oil from seeds. This means that the total remaining oil content in the full-pressed cake is around 10~20%.

Lyzx24 cold press is a new generation of spiral oil press designed for the cold pressing of various oils, especially suitable for mechanically squeezing organic plants and high value-added commercial crops. The cold pressing machine is suitable for squeezing soybean, rapeseed, peanut, etc., Lyzx24 pressing machine could be equipped with single-screw or twin-screw structures. Based on the single-screw press, a twin-screw cold-pressing machine is developed with the improvements of superior mechanical properties and high oil production rate and optimized stamping process, which produces high-quality oil and cold-pressed cakes with high efficiency. If the seed has high oil content, it should be added double press to obtain maximum yield.

This workshop adopts the production technology of batch refining. According to the type and quality of the crude oil, the process parameters are adjusted and different refining methods are selected to produce the first and third-grade oils. The process equipment we provide has the following features:

Liquid soybean oil is sold as vegetable oil or as a component of processed food like margarine, shortening, mayonnaise and various flavoring oils. The refined soybean oil is pale yellow, clear, transparent, odorless, and has a good taste. It can be used for cooking without foam and smoke. It is mainly used as cold salad oil in addition to as the cooking, frying oil. And the remaining soya bean cakes are used as animal feed.

The Soya lecithin, one of the extracts from soybean oil sediments, can also be used in the chemical field. For example, the soya lecithin can be used as antioxidants, color enhancers, catalysts, emulsifiers, grinding aids, and viscosity modifiers in paints and inks. It can evenly disperse pigments, prevent sedimentation, stabilize water-based paints, impart luster to dry film, and improve the fluidity of printing inks; The addition of phospholipids to the paint shortens the kneading time during the manufacturing process and prevents pigment precipitation. And it can produce a good color, increase painting performance, so that the brushing surface is dry, smooth, soft and bright.

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