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high quality new kaolin high efficiency concentrator in melbourne

kaolinite processing | equipment, process flow, cases - jxsc machine

kaolinite processing | equipment, process flow, cases - jxsc machine

Kaolinite is a non-metallic mineral, mainly composed of kaolinite, halloysite, hydromica, illite, montmorillonite and quartz, feldspar and other minerals, often mixed with pyrite, limonite, anatase, quartz, chalcedony, alum, etc. Kaolin is widely used in ceramics, paper, rubber, plastics and refractory industries due to its excellent processabilities such as plasticity, cohesiveness, sinterability and fire resistance. There are three main types of the genesis of kaolin deposits: weathering, sedimentary and hydrothermal alterations.

The processing of kaolin ore depends on the nature of the ore and the end-use of the product. There are two processes used in industrial production: the dry process and wet process. Usually, hard kaolin is produced by the dry process, and soft kaolin is produced by a wet process.

The kaolinite dry mining process is a simple and economical process. The ore is crushed to 25.4mm by a hammer crusher and fed into the cage mill to reduce the particle size to 6.35mm. The hot air in the cage mill reduces the moisture of the kaolin from about 20% to 10%. The crushed ore is further ground by a blown-type Raymond mill equipped with a centrifugal separator and a cyclone. This process removes most of the sand and the product is commonly used in low-cost fillers in the rubber, plastics and paper industries. When used in the paper industry, the product can be used as a filler in the filler layer with an ash content of less than 10% or 12%. At this time, the brightness of the product is not high.

When the dry beneficiation method requires high whiteness of the product, the product produced by Raymond mill must be dry iron removed. The dry process has the advantages of eliminating the dehydration and drying process, reducing the loss of ash powder, short process flow, low production cost, and is suitable for drought and water shortage areas. However, it is necessary to rely on the wet beneficiation process to obtain high-purity kaolin.

The wet process includes three stages of ore preparation, ore beneficiation processing and product processing. The beneficiation stage may include hydraulic grading, flotation, selective flocculation, magnetic separation, chemical treatment (bleaching), etc. to remove different impurities.

The prepared slurry pulp is first desanded by the rake type washing box, floating tank classifier or cyclone, and then divided into two grades of coarse and fine by the continuous centrifuge, hydraulic cyclone, hydraulic separator or vibrating fine sieve (325 mesh).

The fine-grained grade of the classifier is fed into HGMS (high-gradient magnetic separator) to remove iron-titanium impurities. The product is detached by stirring and scouring and then leached by iron oxide. The clay which is high enough in brightness and has good coating properties can be magnetically removed. Stripped and sent directly to the leaching operation. After leaching, alum is added to the slurry to coagulate the clay minerals to facilitate dehydration.

The bleached clay is dewatered using a high-speed centrifuge, a rotary vacuum filter or a filter press. Dewatering by filter or filter press. The filter cake is redispersed into a slurry of 55% to 65% solids and then spray dried to make a loose dry product. Part of the dry product was mixed into the dispersed slurry to make 70% solids and shipped to the paper mill.

The final product, which is not selected, has low brightness and can only be obtained by magnetic separation, froth flotation or selective flocculation in the process. However, these independent operations have their own advantages and disadvantages, so the industry usually uses a combined process of two or three of these processes for the comprehensive utilization of clay resources.

Related post: Whats High Gradient Magnetic Separator? The dyed impurities in kaolin (such as hematite, etc.) have weak magnetic properties and can be removed by a high gradient magnetic separator. In the United States, the PEM-84 wet high gradient magnetic separator can reduce Fe2O3 in kaolin ore from 0.9% to 0.6%, and Ti2O3 from 1.8% to 2.0% to 0.8%. This high-gradient magnetic separator uses stainless steel wool as a medium. When the field strength is 1.5 to 2.0T, it consumes 270-500kw.

China has carried out wet research on Hunan acid, Lingyang, Boluo and Hengling soils, and all of them have obtained good test results, especially the removal of iron and titanium in kaolin by vibration high gradient magnetic separation. Very good test indicators. From the comparative test results of Chinas CLY500 vibrating high gradient magnetic separator and the US PEM-84 high gradient magnetic separator, the high gradient magnetic of China is seen from the iron and titanium impurities and whiteness. The machine performance is better than the United States.

Since some iron impurities in some kaolin mines exist in the form of silicates, the magnetic properties are very weak, and titanium exists in the form of rutile, the magnetic separation method is difficult to work, so the process is usually accompanied by flotation, selective flocculation and other operations. To improve the quality of the product. In recent years, superconducting magnetic separators have been successfully applied to kaolin sorting, which not only reduces energy consumption, but also greatly increases the field strength, and the quality of kaolin concentrate is also higher. The Eriez superconducting magnetic separator features a rapid magnetic lift, achieving the highest design field strength (5T) in 60 seconds, while the degaussing time is short, which greatly reduces the time required to flush magnetic impurities from the magnet during the load cycle. Its energy consumption is low, about 80% less than conventional magnetic separator, and the processing capacity is large, up to 100t/h.

The United Kingdom has tested a reciprocating helical superconducting magnetic system that is similar in design to a conventional can magnetic filter, except that it retains the superconducting magnet in an excited state during the duty cycle without switching control. Continuous operation. The 3048mm superconducting high gradient magnetic separator designed by Humboldt of Germany has simple structure, low operation and maintenance cost and good stability.

The purpose of the flotation operation is to float titanium impurities from the kaolin. Since the impurity particles are extremely fine, a carrier flotation process is usually employed. The carrier mineral may be calcite or silica sand (-325 mesh), and the amount of the carrier mineral is generally 10% to 20% by weight of the kaolin, and a part of the carrier may be reused after being recycled.

The agents used in the flotation process include dispersant sodium silicate, pH adjuster amine hydroxide and caustic soda collector Tal oil, fatty acid and calcium petroleum sulfonate. However, flotation has many disadvantages. The hydrophobization of the carrier requires a large number of chemicals. The flotation process can only be effective at a lower concentration of the slurry, thereby increasing the cost of dewatering. The loaded body must be removed from the clay product as much as possible. Recycling in the product for recycling.

Chemicals and carrier minerals remaining in the clay are detrimental to the final product. Cundy and Yong et al. studied a flotation process that does not require a carrier and floats anatase directly from kaolin, which is characterized by the presence of dispersants (such as sodium silicate) and pH adjusters (usually amine hydroxide). Under high conditions, high pulp concentration (40% to 60% solids) is scrubbed to remove surface contaminants. At the same time, scrubbing also disintegrates anatase and hematite from kaolin minerals, and then traps a small number of activators and fatty acids. The slurry is added together with the slurry, and the anatase covered by the collector forms selective agglomeration under high shear stirring conditions, so that the particle size is significantly increased, and the slurry after high shear stirring and slurry is diluted to 15%~ Flotation is carried out with 20% solids, and alum in kaolin can also be removed by flotation.a You may interest in buying flotation machine, 7 Factors Affecting Froth Flotation

At pH 8~11, selective agglomeration of iron-titanium impurities was observed by adding alkaline earth metal ions such as Ca2+ and Mg2+ to the kaolin slurry, and then selective flocculation was carried out with a weak anionic polyelectrolyte. The process requires a slurry concentration of less than 20%, so a large amount of moisture must be removed in subsequent operations, and the residual flocculant also affects the quality of the final product.

Selective flocculation of kaolin with high-molecular flocculant, the kaolin particles flocculate to the bottom, and the iron-titanium impurities are reddish-brown in the suspension in the upper part due to the fine particles, and the upper suspension can be removed. Most of the iron-titanium impurities are removed and processed by other operations (such as magnetic separation) to obtain high-quality kaolin. Suzhou Kaolin Company has achieved good indicators using a new process of selective flocculation. The use of selective flocculation and high gradient magnetic separation to treat kaolin also obtained satisfactory indicators.

Leaching is carried out in the presence of a weakly acidic solution (pH 3 to 4) in the presence of a reducing agent (NaS2O4) to keep the dissolved iron in the Fe2+ state, avoiding the formation of Fe(OH)3, and washing it with water to separate it from the kaolin. In order to remove the dark organic matter, it can be bleached with a strong oxidizing agent (hydrogen peroxide, sodium hypochlorite, etc.), and the Suzhou Kaolin Company has obtained high-quality kaolin products by oxidative bleaching. It has been reported that the treatment of kaolin with microorganisms can significantly improve the quality of the product.

The selected clay is stored in a slurry tank for 6-8 hours, and the pH is adjusted to 3-4, which is close to the zero points of the clay, so that the clay particles are easily agglomerated. The addition of alum to the pulp helps the agglomeration of the clay particles and promotes dehydration. The cylinder filter is a commonly used dewatering device which increases the slurry concentration to 55% to 60%. One of the important functions of the filtration operation is to remove chemicals from the clay.

To enhance this work, the water spray is often used. Spray drying has become a very effective process in the clay industry, but it is expensive. In recent years, a new filtration process utilizing the electrophoretic properties of charged particles in an electric field has emerged. The kaolin particles are negatively charged at pH > 3 and are surrounded by an oppositely charged ion mist to form an electric double layer.

In the electric field, the clay particles move toward the anode, and the counterions in the ion mist move toward the cathode. When the particles reach the anode, they are used to protect the filter cake formed on the anode film of the electrode. The anode filter cake is further dehydrated by electroosmosis, and the excess water is pumped out through the negatively charged filter cake capillary by the electroosmotic principle.

The dehydrating agent is used to agglomerate the kaolin particles into large particles, which can accelerate the precipitation rate of the particles, facilitate the dehydration, and reduce the kaolin loss of the fine particles. Therefore, the development of new high-efficiency dehydrating agent for kaolin is also one of its research directions.

1 The raw ore mined from the mine is coarsely selected on-site, and a large number of tailings are discarded in the mine. This not only solves the filling of the goaf but also reduces the stockpiling and transportation of the ore in the ore dressing plant. Concentrates of each roughing plant;

3 high-concentration pulping, dispersing agent is added to the pulp during the sorting process, the flocculating agent is added during the dehydration process, and the filter press or vacuum filter product can be sold as a product without drying;

4 In addition to the hydrocyclone classification, the beneficiation operation also uses a centrifugal classifier, a sand mill, a high gradient magnetic separator, and a flotation machine to improve product fineness and reduce impurities such as iron, titanium and sulfur;

5 The chemical bleaching process is commonly used in major kaolin producing countries such as the United States, the United Kingdom, and the former Soviet Union to produce high-whiteness kaolin products, but the cost is high;

6 Kaolin products are sold in bulk, coarse powder, fine powder and paste form. The manufacturer supplies different products according to the requirements of the users. There are many types of drying equipment for the products, but most applications are spray drying, because the cost is relatively low;

7 Concentrators not only have large production capacity, but also many varieties, and are standardized products. It can meet the needs of different users. China Kaolin Company has four categories and 34 varieties. These products are widely used in paper fillers and coatings, ceramics industry raw materials, rubber and plastic fillers and reinforcing agents, white cement oil felts, roofing coatings and waterproofing agent ingredients, fiberglass ingredients, ink pigments, cosmetics and soaps. Fillers, carriers of pesticides and fertilizers, binders for abrasive materials, synthetic molecular sieves, petroleum catalysts, atomic energy reactors, etc.

1 The carrier flotation process makes it possible to select fine-grained kaolin. The advantage is that the kinetic energy of the particles is increased, but the consumption of the agent is high, and the use and processing cost of the carrier mineral is further increased.

2 The activation of polyvalent cations without a carrier can also cause anatase to float, but the consumption of fatty acid-matched collectors is higher than that of other industrial minerals, which may be due to the large surface area of the particles.

3 High-shear agitation plays a two-fold role in the flotation. One is to dissociate the anatase from the kaolinite, and the other is to induce shear flocculation between the anatase particles covered by the collector.

4 High-gradient magnetic separation technology has greatly changed the appearance of the kaolin industry. Especially the vibration high-gradient magnetic separation can effectively remove the iron-titanium impurities in kaolin, but has little effect on the particle size composition and physical and chemical properties of the product. Produce high-quality kaolin products. Dry high gradient magnetic separation treatment of hard kaolin can eliminate product dehydration and reduce product loss, which is suitable for dry and low water areas. The superconducting high gradient magnetic separator has low energy consumption and large processing capacity. The product purity is high and will be widely used in the kaolin industry.

5l oxygen concentrator,oxygen concentrator machine,cabinet oxygen concentrator manufacturers and suppliers in china

5l oxygen concentrator,oxygen concentrator machine,cabinet oxygen concentrator manufacturers and suppliers in china

Product categories of Oxygen Concentrator, we are specialized manufacturers from China, 5L Oxygen Concentrator, Oxygen Concentrator Machine suppliers/factory, wholesale high-quality products of Cabinet Oxygen Concentrator R & D and manufacturing, we have the perfect after-sales service and technical support. Look forward to your cooperation!

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kaolin beneficiation process,kaolin beneficiation plant | prominer (shanghai) mining technology co.,ltd

kaolin beneficiation process,kaolin beneficiation plant | prominer (shanghai) mining technology co.,ltd

The processing technology of kaolin ore depends on the nature of the ore and the end use of the product. There are two kinds of dry process and wet process used in industrial production. Usually, hard kaolin is produced by dry process, and soft kaolin is produced by wet process.

The dry process is a simple and economical process. After the mined raw ore is crushed to 25.4mm by a hammer crusher, it is fed into a cage crusher to reduce the particle size to 6.35mm. The hot air in the cage crusher reduces the moisture of the kaolin from 20% About 10%. The crushed ore is further refined by a blown Raymond mill equipped with a centrifugal separator and cyclone dust collector. This process can remove most of the sand and gravel. The products are usually used as low-cost fillers in the rubber, plastics and paper industries. When used in the paper industry, this product can be used as a filler where the ash content of the filler layer is less than 10% or 12%, and the brightness of the product is not required at this time.

When the dry method requires high whiteness of the product, the product produced by the Raymond mill must be subjected to dry iron removal. The advantage of the dry process is that it can save the process of product dehydration and dry operation, reduce the loss of ash, the process is short, the production cost is low, and it is suitable for arid and water-scarce areas. But to get high-purity high-quality kaolin, we must rely on wet process. Wet beneficiation process

The wet process includes three stages: ore preparation, mineral processing and product processing. The preparation stage includes batching, crushing and tamping operations. Tamping is to mix the raw kaolin ore with water and dispersant in the tamping machine to make pulp. The tamping operation can disperse the raw ore, prepare the kaolin ore pulp of appropriate fineness for the sorting operation, and remove the large-grained sandstone. The beneficiation stage may include hydraulic grading, flotation, selective flocculation, magnetic separation, chemical treatment (bleaching) and other operations to remove different impurities. The prepared pulp is de-sanded by rake washing box, float tank classifier or cyclone, and then it is divided into continuous centrifuge, hydrocyclone, hydraulic separator or vibrating fine screen (325 mesh) Two grades of thickness. The fine-grained grade of the classifier is sent to HGMS (high gradient magnetic separator) to remove iron and titanium impurities. The product is leached with iron oxide after being stirred and scrubbed and peeled off. The clay with high brightness and good coating performance can be removed without magnetic separation and Stripped and sent directly to the leaching operation. After leaching, alum is added to the slurry to make the clay minerals coagulate and facilitate dehydration. The bleached clay is dehydrated with a high-speed centrifuge, rotary vacuum filter or filter press. Filter or filter press dehydration. The filter cake is redispersed into 55% to 65% solid slurry, and then spray dried to make a loose dry product. Part of the dry product is mixed into dispersed pulp to make 70% solids and shipped to the paper mill by boat.

The final product without selection has lower brightness, and only high-brightness clay products can be obtained by configuring magnetic separation, foam flotation or selective flocculation in the process. However, these independent operations all have their own advantages and disadvantages, so the industry usually adopts a combined process of two to three of these processes for the comprehensive utilization of clay resources.

Dyeing impurities in kaolin (such as hematite, etc.) have weak magnetic properties, so they can be removed by a high gradient magnetic separator. The US uses PEM-84 wet high-gradient magnetic separator to reduce the Fe2O3 in the kaolin ore from 0.9% to 0.6% and Ti2O3 from 1.8% to 2.0% to 0.8%. This kind of high-gradient magnetic separator uses stainless steel wool as the medium. When the field strength is 1.5 2.0T, the power consumption is 270 500kw. In China, wet methods have been carried out on Hunan Huling, Leiyang, Poluo and Hengling clays [3-6], all of which have achieved good test results, especially the removal of iron and titanium in kaolin by vibrating high gradient magnetic separation A very good test index. From the comparison test results of China's CLY500 vibrating high-gradient magnetic separator for Leiyang Kaolin in Hunan and the high-gradient magnetic separator of PEM-84 in the United States, China's high-gradient magnetic The machine selection performance is better than the United States.

Because some iron impurities in some kaolin mines exist in the form of silicate, the magnetic property is very weak, while titanium exists in the form of rutile, the magnetic separation method is difficult to work, so the process is usually equipped with flotation, selective flocculation and other operations To improve product quality. In recent years, superconducting magnetic separators have been successfully used in kaolin separation. Not only does energy consumption decrease, but the field strength can be greatly improved, the quality of kaolin concentrate is also higher. Eriez superconducting magnetic separator has the characteristics of rapid magnetization, can reach the highest design field strength (5T) within 60s, and the demagnetization time is short, which greatly shortens the time required to flush magnetic impurities from the magnet during the load cycle. Its energy consumption is low, about 80% less than the conventional magnetic separator, and the processing capacity is large, which can reach more than 100th. The United Kingdom has tested a reciprocating helical tube superconducting magnetic system. Its design is similar to a conventional pot-shaped magnetic filter. The difference is that it still keeps the superconducting magnet in the excitation state during the working cycle without the need for switch control. Continuous operation. The 3048mm, superconducting high gradient magnetic separator designed by Humboldt Company of Germany has a simple structure, low operation and maintenance costs, and good stability.

The purpose of the flotation operation is to float titanium impurities from kaolin. Because the impurity particles are very fine, the carrier flotation process is usually used. The carrier mineral can be calcite or silica sand (-325 mesh). The amount of carrier mineral is generally 10% to 20% of the weight of kaolin. A part of the carrier can be reused after being recycled. The agents used in the flotation process include the dispersant sodium silicate, the pH adjuster amine hydroxide and the caustic soda collector, tall oil, fatty acids and calcium petroleum sulfonate. However, there are many shortcomings in flotation. The hydrophobization of the carrier requires a large amount of reagents. The flotation process can only be effective at a low slurry concentration, thereby increasing dewatering costs. The loaded body must be removed from the clay product as much as possible. And from the foam The product is recycled for recycling. The chemicals and carrier minerals remaining in the clay are harmful to the final product. Cundy and Yong et al. Studied a flotation process that does not require a carrier, and floats anatase directly from kaolin, which is characterized by the presence of dispersants (such as sodium silicate) and pH adjusters (commonly used amine hydroxides). Under conditions, scrub with high slurry concentration (40% to 60% solids) to remove surface contaminants. At the same time, scrubbing also dissociates anatase and hematite from kaolin minerals, and then captures a small amount of activator and fatty acids The slurry is added into the slurry together, and the anatase covered by the collector forms selective agglomeration under high shear stirring conditions, thereby significantly increasing the particle size. The slurry after high shear mixing and slurry mixing is diluted to 15% ~ 20% solids are used for flotation, and alum in kaolin can also be removed by flotation.

At pH 8 ~ 11, adding Ca2 +, Mg2 + and other alkaline earth metal ions to kaolin slurry can observe the selective aggregation of iron-titanium impurities, and then use weak anion polyelectrolyte for selective flocculation. The process requires the slurry concentration to be less than 20%, so there must be a lot of water to be removed in subsequent operations, and the residual flocculant also affects the quality of the final product.

Selective flocculation of kaolin with polymer flocculant, kaolin particles flocculate and settle to the bottom, iron and titanium impurities are reddish brown in the upper suspension due to the fine particles, and the upper suspension can be removed by removing Most of the iron and titanium impurities are removed, and then processed by other operations (such as magnetic separation) to obtain high-quality kaolin. Suzhou Kaolin Company has achieved good indicators by adopting a new selective flocculation process. The use of selective flocculation plus high-gradient magnetic separation for kaolin treatment also achieved satisfactory indicators.

The leaching is carried out in the presence of a reducing agent (NaS2O4) in a weakly acidic solution (pH 3 ~ 4), which can keep the dissolved iron in the Fe2 + state, avoid the formation of Fe (OH) 3, and separate it from kaolin by washing with water. In order to remove dark-colored organic matter, strong oxidants (hydrogen peroxide, sodium hypochlorite, etc.) can be used for bleaching. The Suzhou Kaolin Company's selection plant has obtained high-quality kaolin products by oxidative bleaching. According to reports, the treatment of kaolin with microorganisms can significantly improve the quality of the product.

The selected clay is stored in the slurry tank for 6-8 hours, the pH is adjusted to 3-4, close to the zero electric point of the clay, so the clay particles are easy to agglomerate. The addition of alum to the ore pulp helps the agglomeration of clay particles and promotes dehydration. Cylinder filter is a commonly used dewatering device, it can increase the concentration of ore pulp to 55% ~ 60%. One of the important functions of the filtering operation is to remove the chemical agents in the clay. To strengthen this operation, water spray is often used. Spray drying has become a very effective process in the clay industry, but it is expensive. In recent years, a new type of filtration process using the electrophoretic properties of charged particles in an electric field has emerged. Kaolin particles are negatively charged at pH 3 and surrounded by oppositely charged ion mist to form an electric double layer. In the electric field, the clay particles move to the anode, and the counter ions in the ion mist move to the cathode. When the particles reach the anode, they are used to protect the filter cake formed on the anode film of the electrode. The anode filter cake is further dehydrated by electroosmosis, and excess water is pumped out through the negatively charged filter cake capillary according to the principle of electroosmosis.

The dewatering agent is used to agglomerate the kaolin particles into large particles, which can accelerate the precipitation speed of the particles, facilitate dehydration, and reduce the loss of fine particles of kaolin. Therefore, the development of new high-efficiency dehydrating agents for kaolin is also one of its research directions.

Prominer has been devoted to mineral processing industry for decades and specializes in mineral upgrading and deep processing. With expertise in the fields of mineral project development, mining, test study, engineering, technological processing.

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