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The quartz sand scrubber is an important equipment used in the mining industry. It mainly removes impurities and clay stone quality from the surface of the mining through strong operation. The slurry enters the scrubber body through the feed pipe, and produces intense vortex under the strong beater operation of the impeller. The ore particles have huge kinetic energy in it, and produce intense friction and collision with each other. Mining silica sand scrubber double-slot high-speed mixing barrel 20T zirconium silicate sand washing equipment The impurities and thin films wrapped on the surface of the ore particles are not strong, and they can be easily peeled off the surface of the ore after friction and collision. The strong friction and collision between the adhesive-impregnated ore particles on the surface of the ore layer will also loosen and break, thereby achieving the separation of clay and ore particles. These film impurities and clay break and peel off into the ore slurry, an...

The deep cone sludge thickener is based on the traditional vertical flow sedimentation tank. The structure of the internal feed cylinder is improved, the efficiency of sedimentation is greatly improved, the plane of the sludge thickening tank body is circular, and the suspended solids settle under gravity.In the bottom of the tank, the clarified water is discharged from the overflow weir around the upper end of the tank. The overflow port is provided with a scum filter device and a baffle to ensure the effluent water quality, the underflow concentration is up to 70%, and the treatment capacity is 3-8 times higher than that of the conventional concentrator. The sludge thickening tank is based on gravity and sedimentation which makes solid-liquid separate from each other. The concentration of pulp waste water could be enhanced from 2%~ 15% to 60% ~ 70% by the machine, the clear water is overflow from the upper part of the thickener , so as to achieve the purpose of sewage purification a...

Typical principle process flow of kaolin beneficiation : rough separation adopts spiral classifier and hydrocyclone classification to remove a large amount of coarse sand. Φ42m sedimentation tank, Φ14-20m grading tank and centrifugal classifier are selected for grading, and the particle size distribution is strictly controlled. And according to the quality characteristics of the raw ore of each pit and the product quality requirements, chemical bleaching, high gradient magnetic separation or stripping operations can be taken respectively to obtain different grades of products.

If there is no ballast, the rails and sleepers are laid directly on the roadbed, and the roadbed may not be able to bear the weight of the train and sink downward. The gaps and texture between the crushed stones of the ballast play a good role in dispersing the huge pressure generated by the passing of the train, and evenly disperse the pressure to the foundation. The elasticity of the ballast can well disperse the vibration and noise of the train, making passengers more comfortable and protecting the roadbed. The production, storage and loading of ballast are all completed in a dedicated storage and transportation base. The base is generally located in a location close to the railway freight station, which is convenient for production, loading and transportation, and maximizing efficiency. The stone used to make ballast is natural stone. The raw stones that meet the requirements of hardness, wear resistance, water permeability and other indicators will be transported to the ballast pr...

Install supporting or hanging devices. When installing the circular vibrating screen, the ground should be shoveled and sturdy to prevent problems caused by uneven ground surface during use. Follow the support or hoisting drawings to operate. The installation of each component should be carried out in strict accordance with the sequence of operations. The spring components should be installed before Match the actual stiffness of the end face mark. Connect the screen box to the supporting or hanging device. After installation, it should be adjusted according to the specified inclination. For hanging screens, the inclination of the screen box and the level of the main shaft of the screen box should be adjusted at the same time. Generally adjust the horizontality first to eliminate the deflection of the screen box. After the level is corrected, adjust the longitudinal inclination of the screen box. The force of the vibration isolation spring should be uniform and the force can be judged b...

YK series circular vibrating screen can screen out various specifications of sand. The rocks suitable for sand making, such as river pebbles, limestone and granite, go through the crusher and then enter the circular vibrating screen to screen out fine sand (sand with an average particle size of 0.25mm~0.125mm), medium sand (0.5~0.25mm) and coarse sand (1mm~0.5mm). If the customer needs a specific size of sand, you can replace the corresponding type of screen. YK series circular vibrating screen is mainly composed of screen box, screen, vibrator and damping spring. The vibrator is installed on the side plate of the screen box, and the motor rotates through the coupling, which produces centrifugal inertia force and forces the screen box to vibrate. The YK series circular vibrating screen is installed with a seat, and the adjustment of the inclination angle of the screen surface can be realized by changing the position and height of the spring bearing.

Y series multilayer circular vibrating screen is high efficient sand vibrating screen.  It filter materials into multiple grades according to the size. For the compact structure and the convenient installation, it is the ideal screening device for prefilter of the feed materials before the primary crushing in the quarry site, it also can be used as separation and filtration solely. The vibrating screen adopts cylinder type eccentric shaft vibrator and partial block to adjust the amplitude. The material sieve drip line is long and more sieving specifications. 1. Vibrating screen YA is of double decks to four decks whose moving track is round. 2. The moving track of material is very long; the size of material can be separated into several specifications. 3. It adopts cylinder style inspiring vibrator device and eccentric shaft to adjust. It has the features of reliable structure, strong vibrating generation, high screening efficient, low noise, easy maintenance, safe performance, et...

The Trommel Screen is also called rotary screen or drum screen, which screening the material into different size. Washing: The bucket is driven by the motor through the reducer and rotates in circle. There are many sand storage web grooves and bucket screen for sand storage and primary dewatering. When the bucket moves, sand can be put out by sand storage web groove after being cleaned in the cleaning tank and primary dewatered on the bucket screen. Recycling: Flowing slurry water is extracted by slurry pump, fine sand is collected by the centrifugal force of the cyclone, then fed to the polyurathane screen from the apex spray. The 0.16-3mm fine sand and water are efficiently separated through the vibration screen. Dewatering: coarse sand (3-10mm) and fine sand (0.16-3mm) are fed onto polyurathane vibrating screen for dewatering.

 A 100 ton per hour silica sand purification plant in cost about 150,000 USD. Product Advantages (1) Extracting the fine material in the raw material slurry firstly can effectively reduce the load of the subsequent equipment and reduce the type of the equipment, thereby achieving the purpose of small investment and small floor space, reducing wear and tear on the equipment and prolonging the service life. (2) The fine sand recovery machine has reasonable waterway design, including backwater regulation and overflow regulation, which makes the recovery effect of the whole machine more ideal. The internal structure of the concentration tank is designed according to the principle of fluid dynamics, fully considering turbulence and settlement. In other aspects, in the case of the same amount of processing, the volume is smaller, and the amount of flocculating agent is more economical; the filter press adopts fully automatic program-controlled pulling plate technology, and a pressure ga...

The green and environment protection sand washing production line is a system solution for the problems of  sand dewatering, tailwater purification, waste dry discharge. The silica sand washing plant mainly includes screening, cleaning, dehydration, fine material recovery, solid-liquid separation, sludge dewatering, and other aspects. The material is effectively screened, washed and dewatered throughout the system. Save resources and reduce water consumption. The entire production line has excellent continuous working performance and convenient maintenance. Long service life, easy to move and excellent effect. At the same time, it ensures no pollution and meets environmental protection requirements. A 300ton per hour silica sand purification plant in cost about 500,000 USD. The green and environment protection sand washing production line is a system solution for the problems of  sand dewatering, tailwater purification, waste dry discharge. The silica sand washing plant ...

The deep cone sludge thickener is based on the traditional vertical flow sedimentation tank. The structure of the internal feed cylinder is improved, the efficiency of sedimentation is greatly improved, the plane of the sludge thickening tank body is circular, and the suspended solids settle under gravity. In the bottom of the tank, the clarified water is discharged from the overflow weir around the upper end of the tank. The overflow port is provided with a scum filter device and a baffle to ensure the effluent water quality, the underflow concentration is up to 70%, and the treatment capacity is 3-8 times higher than that of the conventional concentrator. sludge thickener manufacturer

Vibrating feeder also called vibratory feeder is made of vibrating frame, spring, vibrator, motor vibrating device and motor. The vibrator consists two fixed eccentric shafts whose gears are jogged. When installation, the two gears must be jogged according to the sign. By drive of the motor, the two eccentric shafts start rotating to generate a linear huge power which forces the feeder to vibrate back and forth. Through the vibration, The materials will slip and sling on the funnel, moving forward, when the materials pass the screening part, smaller material will fall down, avoiding the further crushing, so screening purpose is reached. Product Features 1.Smoothly vibrating and long service life. 2.Vibrating force adjustable, easy to operation. 3. Low noise and power consumption. 4. Simple structure, easy to maintenance.

 Thickeners are widely used in mineral processing, mainly in the following aspects Slurry concentration In the mineral processing process, the concentration of the slurry directly affects the efficiency and effect of the subsequent process. By thickening the slurry with a thickener, the concentration of the slurry can be increased, the processing volume of the subsequent process can be reduced, and thus the production efficiency can be improved. Tailings treatment Tailings are waste generated during the mineral processing process and usually contain a large amount of water. Dehydrating the tailings with a thickener can reduce the volume of the tailings, reduce the construction and maintenance costs of the tailings pond, and reduce the impact on the environment. Backwater utilization In the mineral processing process, the utilization efficiency of water resources is crucial. By thickening the slurry with a thickener, the clear liquid can be recovered for the production process, red...

Coastal zircon titanium ore dressing process 1. Grinding Grinding is the process of crushing and grinding the original ore to meet the particle size requirements of the subsequent mineral processing process. Commonly used equipment includes ball mills, rod mills, etc., which use mechanical force to crush and grind the ore. 2. Roughing Roughing is the process of preliminarily separating useful minerals from useless minerals in the raw ore to improve the grade of the ore. Commonly used methods include gravity separation, flotation, magnetic separation, etc., which separate the ore by different physical properties. 3. Concentration Concentration is to further separate and purify the roughing products on the basis of roughing to further improve the grade and recovery rate of the ore. Commonly used methods also include flotation, gravity separation, magnetic separation, etc.

The dry sand production line has many advantages, such as saving water resources, low water content of finished products, and small footprint. However, the disadvantages are also obvious and worthy of attention, such as: 1. Uneven coarseness and fineness: The preparation process of dry sand is prone to form some fine pores and cracks, resulting in uneven coarseness and fineness, unreasonable grading, and commercial mixing stations cannot be used directly. 2. Poor particle shape: The particle shape of dry sand is irregular, with more protrusions and sharp angles on the surface. 3. There is a certain amount of stone powder residue on the surface of the product aggregate, the cleanliness is not high, and the appearance is poor. In view of the above shortcomings, Longzhong Heavy Industry has tailored a complete production line for it. The production line consists of a set of equipment such as silos, conveying equipment, sand washing and fine sand recovery equipment, trihydrogen purificati...

 Environmentally protection sand washing plant design principles 1. Seriously implement regulations, norms, and standards on environmental protection. 2. According to the sewage water quality and treatment requirements, choose a reasonable treatment process route, require the treatment technology to be suitable and reliable, and handle the effluent water quality to meet environmental protection requirements. The operation is stable and the investment is reduced while meeting the processing requirements. 3, equipment selection should consider performance and price factors, require high efficiency and energy saving, low noise, reliable operation, easy maintenance and management, and make full use of the original facilities and equipment. The equipment includes sand making machine, sand washing and recycling machine, waste water purifying system.

Frac sand screen working principle After the screen machine is started, the screen box reciprocates back and forth under the action of inertial force. The screen box drives the screen surface to periodically shake, so that the materials on the screen surface will make a directional jump movement with the screen box. The material smaller than the screen surface aperture After falling through the sieve hole, it becomes the sieve. The material larger than the hole diameter of the sieve surface is discharged from the discharge port after continuous tumbling and jumping movement to complete the screening work.

Core equipment for tungsten ore crushing and grinding Jaw crusher: Preliminary crushing of large pieces of ore, laying the foundation for subsequent processing. Cone or impact crusher: Further refine the ore particle size to meet the grinding requirements. Ball mill: Core grinding equipment, grinding the ore to the required fineness through friction and impact. Key equipment for classification and concentration Spiral classifier or hydrocyclone: ​​Classify the ore pulp after grinding and optimize the selection conditions. Concentrator: Increase the mineral concentration, reduce the moisture, and provide the best conditions for subsequent selection. High-efficiency sorting technology equipment Flotation machine: Use reagents and slurry conditions to efficiently separate the target minerals from the gangue. Magnetic separator: Effectively separate magnetic minerals. Screening equipment: remove impurities and optimize pulp quality.

Generally speaking, the water quality and concentration of sewage and sludge , as well as changes in sewage properties, will affect the dosage of flocculants. Turbidity, that is, concentration, is directly reflected in the dosage. For sewage or sludge with low turbidity, a small amount of flocculant can produce an effect, while for sewage with high turbidity and high concentration, a small amount of flocculant will not work. In sand washing wastewater, 12g-20g of flocculant polyacrylamide needs to be added per ton of sand washing wastewater, and the dosage is adjusted according to the concentration of sediment in the muddy water. Ore dressing wastewater is generally solved with 6g of polyacrylamide. In the treatment of coal washing wastewater, the dosage is the same as that of the ore dressing industry, and 6g can be added. The above data is anionic polyacrylamide with a molecular weight of 16-18 million. In sludge dehydration, urban sewage treatment plants that need cationic polyacryl...

From the perspective of sludge treatment equipment supply, the equipment supply chain of sludge treatment can be refined and divided into tempering and wall breaking, sludge dewatering machine, conveying equipment, deodorizing equipment, digestion equipment, composting equipment, drying equipment, and incineration equipment according to demand. Among them, the technical content of dewatering machine, conveying equipment, and deodorizing equipment is relatively low, and tends to be general equipment; while the technical content of digestion equipment, composting equipment, drying equipment, and incineration equipment is relatively high, involving the company’s parameter setting for sludge treatment process, engineering experience, etc.; the highest technical barriers are still related technical equipment of tempering and wall breaking. Harmlessness and stabilization are the basic requirements of various treatment technologies, and the method is incineration and subsequent treatment of f...

The LX SERIES spiral sand washing machine also named sand screw, screw sand washer, which was designed to provide bigger capacity and higher cleaning level than traditional ones. The input materials’ max size can be 30mm. Widely used for cleaning materials in the quarry, minerals, building materials, transportation, chemical industry, water conservancy and hydropower, cement mixture station and so on. They are ideal for construction sand producers, mining companies, salt/brine reclamation, and glass recycling. It is composed of the electric motor, big and small belt pulleys, triangle belt and gear reducer. The screw sand washer adopts inclination of 15 degrees. Under the water tub, three weir plates form the sediment pool. The spiral head is immersed in this pool, and the spiral is driven by electric motor through reducer rotating continuously. The fresh water is fed from porous plate at bottom of sediment pool, and the washed sand is discharged on the top side and delivered by belt c...

For concrete cohesion, they believe that if there are fewer particles <0.075mm in the sand, the concrete will easily bleed, and the mixed concrete will be relatively dry and astringent. Therefore, the appropriate content of <0.075mm particles has certain benefits for the cohesion and water retention of concrete. When the mud content is 5% of the sand mass, the workability is good, but when it reaches 10%, the bleeding of concrete is more obvious. The mud content not only has some effect on the initial slump of concrete, but also has a great harm to the slump loss of concrete over time. In the absence of admixtures, it is generally believed that when the mud content in the sand is <3%, the workability of the concrete is less affected, but as the mud content increases, the slump of the concrete continues to decrease. When it is greater than 3%, the workability of the concrete will be greatly affected. https://www.lzzgmachine.com/service-parts/product-knowledge/retaining-fine-par...

Tin oxide ore is one of the main sources of tin. Tin ore resources mainly include cassiterite (SnO2) and tin sulfide ore, while tin oxide ore mainly refers to cassiterite. Cassiterite is a mineral that is widely mined due to its relatively high tin content, generally in the form of quartz veins, pegmatites or placers. The best beneficiation method is to combine different beneficiation technologies to adapt to the characteristics of different ores, maximize the recovery rate of tin and reduce costs. The following are some beneficiation methods for tin oxide ore: Gravity separation: Due to the high specific gravity of cassiterite, gravity separation is a common method for separating cassiterite. Cassiterite can be effectively separated from light minerals through equipment such as jigs, shaking tables, spiral chutes, etc. Gravity separation is simple, low-cost, and suitable for coarse and medium-sized ores. https://www.lzzgmachine.com/solutions/beneficiation-methods-for-tin-oxide-ore.htm...

Hydro Cyclone is suitable for processing various types of pulp. Whether it is coarse or fine slurry, it can be effectively classified by cyclone 1. Grinding and classification In the fluorite ore dressing process, grinding is an important link. Due to the different embedded particle sizes of fluorite and gangue minerals, it is necessary to separate the monomers through grinding. The cyclone plays a key role in the classification process after grinding. Through the classification of the cyclone, the slurry after grinding can be divided into coarse particles and fine particles. The coarse particles return to the mill for further grinding, and the fine particles enter the next beneficiation process. This not only improves the grinding efficiency, but also ensures the smooth progress of the subsequent beneficiation process. 2. Pretreatment before flotation In the flotation process of fluorite ore, the particle size distribution of the slurry has an important influence on the flotation eff...

In general, the beneficiation of tin ore must first be screened to screen out large pieces of waste rock to improve the efficiency of the subsequent beneficiation process. If the mud content is high, washing is required. Therefore, the screening process usually uses a multi-purpose drum washing machine, which has both the functions of washing and screening. It is very common in the field of tin ore and gold ore washing. After washing and screening, the ore sand can enter the gravity separation process for rough separation. The gravity separation process usually uses a jig as the core gravity separation equipment. The jig for sand tin ore selection has multiple advantages such as high ore separation efficiency, good ore separation effect, high recovery rate, and low production cost. It is also the most energy-saving and environmentally friendly gravity separation equipment. The jig plays an irreplaceable role in the beneficiation of sand tin ore. Due to different types of tin ore, some...

Stone powder refers to particles less than 75μm in artificial sand and mixed sand. Most of the stone powder in artificial sand is fine particles of broken parent rock. Unlike mud in natural sand, their role in concrete is also very different. On the one hand, high stone powder content increases the specific surface area of ​​sand and increases water consumption; on the other hand, the ball effect produced by fine spherical particles will improve the workability of concrete. Therefore, stone powder in artificial sand cannot be regarded as a harmful substance. The comprehensive impact of stone powder content on artificial sand has been proved by decades of experiments: Guizhou Province began to study the use of artificial sand in the 1970s. When the stone powder content in artificial sand is 0-30%, it has little effect on the performance of concrete, has no effect on the compressive and tensile strength of medium and low-grade concrete, and has little effect on the strength of C50 grade...

For feldspar ore produced from feldspathic placer or weathered granite, the ore washing method can be used to remove impurities such as clay, mica, fine mud, etc. The Fe2O3 content of the washed feldspar ore is reduced, and the potassium and Sodium content is increased. The principle of mineral washing is that clay, mica and fine mud have small particle size and small specific gravity, so they settle slowly and can be separated from coarse-grained feldspar under the action of water flow. Ore washing equipment generally uses a washing tank or a vibrating screen. Mining sites generally use washing tanks, and mineral processing plants generally use vibrating screens. Currently, many feldspar ores use this method for impurity removal and purification. The primary slime in the feldspar mine and the secondary slime produced during the mining process will affect its mineral processing effect, so it must be removed in advance before mineral processing. The process of removing slime is called...

Effect of high sand content on concrete 1. When the amount of sand is the same, if the sand is too coarse, the cohesiveness of the mixed concrete is poor, and it is easy to produce segregation and bleeding; If the sand is too fine, the total surface area of ​​the sand increases. Although the cohesiveness of the mixed concrete is better and it is not easy to produce segregation and bleeding, the amount of cement increases. 2. Concrete prepared with well-graded sand not only uses less cement slurry and saves cement, but also improves the workability, density and strength of the concrete. 3. The coarseness and particle grading of the sand are determined by sieve analysis.

The cross section of the spiral concentrator is mostly 1/4 of an ellipse, suitable for sorting mineral particles of 2 to 0.07 mm; the cross section of the spiral chute is cubic parabolic, suitable for sorting ore particles of 0.3 to 0.02 mm. The spiral concentrator and spiral chute have low investment in infrastructure, low energy consumption, simple and reliable equipment, easy operation, high enrichment ratio, and can obtain a variety of products. But the ore must be fed evenly. Compared with other mineral processing methods, gravity separation has the advantages of large processing capacity, wide particle size range, simple equipment structure, no consumption of precious production materials, low operating costs, and no pollution. Therefore, it is widely used in the mineral processing of tungsten and tin ores. . It is also widely used in the separation of ferrous metals (iron, manganese, chromium), rare metals (tantalum, niobium, thorium, zirconium, titanium, etc.) and precious meta...

On April 17, a train loaded with desulfurized gypsum slowly pulled out from Bijie East Station and was transported to Fangchenggang Station in Guangxi to realize the export of bulk solid waste. This train is Guizhou’s first complete desulfurization gypsum foreign trade train. The desulfurization gypsum loaded on the train will be transported by sea and arrive at the Jinpu Terminal in Vietnam 15 days later. It has expanded the previous domestic transportation mode to international, broadened the sales radius of desulfurization gypsum, and helped “Turning waste into treasure”. It is reported that solid waste generated by thermal power generation is usually used as raw materials for building materials for dynamic consumption. In recent years, with the continuous growth of thermal power generation in our province, the amount of solid waste has also increased accordingly. The most representative ones are ash and desulfurization. Gypsum, at the same time, the construction and other industrie...

At present, chromium ores with industrial value are generally chromium-magnesia spinel or chromium-iron spinel minerals, which contain a large amount of chromium oxide, with a content of about 18% to 62%, and generally also contain metals such as aluminum and nickel. Its characteristics make the chromium ore beneficiation process present a rich and diverse state. Due to the properties of chromium, chromium ore beneficiation processes include gravity separation, magnetic separation, flotation, combined beneficiation, chemical beneficiation, etc. Commonly used in industry are single gravity separation, single magnetic separation, and gravity-magnetic combined beneficiation processes. In terms of equipment selection, shakers and jigs are mostly used in the gravity separation stage, while the equipment selection in the magnetic separation stage is determined based on the magnetism of the ore.

China's largest copper smelter has proposed a production cut of 5% to 10% and decided not to publish copper processing fee (TC) guidance prices for the second quarter, two people familiar with the matter said on Thursday. The decision was taken after a meeting of the China Smelter Purchasing Group (CSPT) in the commercial hub of Shanghai, which has been facing the dual dilemma of raw material supply shortages and a sharp drop in TC prices in the spot market. Copper ore washing plant Participants told Reuters that large smelters are concerned about the current situation in the spot market, which they believe has become divorced from true market fundamentals. It is worth noting that the last time CSPT refused to set a guidance price was in the second quarter of 2021. In addition, large smelters made proposals to limit output in January this year, but did not take actual action. Smelters such as Jiangxi Copper, Jinchuan Group and China Copper have yet to comment on this production red...

With the extensive use of quartz resources, high-quality crystal and vein quartz are decreasing day by day, and low-grade quartz resources are receiving more and more attention. LZZG has developed natural quartz sand and quartz sand purification processes for customers. High-purity quartz sand refers to quartz sand with a silica content higher than 99.9% (3N). Low-end, mid-range and high-end products are distinguished by silica content of 99.9%, 99.99% and 99.998%.

Indonesian kaolin has a long way to go from its origin to being usable in various industrial processes. Below we will see how it was created and where it comes from. Kaolin gravity separation equipment First, kaolin must be mined using water jets. The kaolinite is then centrifuged with a kaolin slurry, thereby removing the sand, and the kaolinite is ready for triple filtration, using 100 to 325 mesh screens. The kaolinite is purified and solidified after being filtered by a high-pressure pump and a filter press. In this step, a kaolin block with a moisture content of 33% to 35% is produced. If you want kaolin with a lower moisture content, it must be naturally dried until the moisture content is between 12% and 14%. This kaolin clay has a moderate moisture content compared to dry kaolin clay, which contains only 1-4% moisture.

The basis for selecting a hydrocyclone is: ① The volume of slurry required to be processed Q (m3/h); ② The classification particle size (or the maximum overflow particle size) d (mm). First, determine the diameter D of the cyclone based on Q and d. Generally, when the overflow is thicker and the production capacity is large, a large-sized cyclone is used, otherwise a small-sized cyclone is used. When the required production capacity is large and the overflow is very thin, small-sized cyclones can be connected in parallel to form a cyclone group.

Quartz crucible requires high purity quartz sand Since quartz crucibles need to withstand high temperatures and corrosive environments during use, the purity of the material is very high. Ordinary quartz sand may contain impurities, such as iron oxide, aluminum oxide, etc. These impurities may affect the experimental results and cause cracks and damage on the surface of the quartz crucible. Therefore, a quartz crucible requires a quartz sand content of at least 99.9%. Such high-purity quartz sand can ensure the quality and performance of quartz crucibles and improve the accuracy and reliability of experiments.

Foundry sand is mainly classified according to its particle size and chemical composition. Particle size standard According to the particle size of the sand, foundry sand can be divided into the following standards: -Coarse sand: 0.6mm-2.36mm; – Medium sand: 0.2mm-0.6mm; – Fine sand: 0.075mm-0.2mm; – Ultrafine sand: less than 0.075mm.

The gravity separation and purification process mainly uses the density and particle size differences between kaolin and gangue minerals to remove light organic matter and high-density impurities containing elements such as iron, titanium and manganese to achieve the purpose of purifying kaolin and reduce or remove impurities. negative impact on its whiteness. Using a small cone angle cyclone group or centrifuge to replace the washing and screening operations in the kaolin purification process can not only achieve the purpose of washing and classifying, but also remove some impurities, which has good application value, but at the same time it must also be considered It is difficult to obtain the final kaolin product that meets the requirements through the gravity separation process alone. After gravity separation and purification, calcination, magnetic separation and leaching are still required to obtain the final qualified product.