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Kaolin powder
Kaolin is a non-metallic mineral, a kind of clay and clay rock dominated by kaolinite clay minerals. Because it is white and delicate, it is also called white cloud soil. It is named after Gaoling Village, Jingde Town, Jiangxi Province. The
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Kaolin is a non-metallic mineral, a kind of clay and clay rock dominated by kaolinite clay minerals. Because it is white and delicate, it is also called white cloud soil. It is named after Gaoling Village, Jingde Town, Jiangxi Province.
The pure kaolin is white, fine, soft and soft, with good plasticity and fire resistance and other physical and chemical properties. Its mineral composition is mainly composed of kaolinite, halloysite, hydromica, illite, montmorillonite, quartz, feldspar and other minerals. Kaolin has a wide range of uses. It is mainly used in papermaking, ceramics and refractory materials, followed by coatings, rubber fillers, enamel glazes and white cement raw materials, and a small amount is used in plastics, paints, pigments, grinding wheels, pencils, daily cosmetics, soaps, etc. Pesticides, medicines, textiles, petroleum, chemicals, building materials, national defense and other industrial sectors.
processing methods:
(1) In order to separate non-clay minerals and organic matter such as quartz, feldspar, mica, iron minerals, titanium minerals in kaolin, and produce kaolin products that can meet the needs of various industrial fields, in addition to the use of gravity separation, flotation, and magnetic separation In addition to the purification of kaolin, it is sometimes necessary to use deep processing methods such as chemical bleaching, ultra-fine peeling, calcination, and surface modification to treat the kaolin. The beneficiation and processing of kaolin can be divided into two processes: dry method and wet method.
(1) The dry method generally crushes the mined ore to about 25mm through a crusher, and feeds it into a cage crusher to reduce the particle size to about 6mm. The crushed ore is further pulverized by a blown Raymond mill equipped with a centrifugal separator and a cyclone dust collector. This process can remove most of the sand and gravel, and is suitable for processing those ore with high raw ore whiteness, low sand content and suitable particle size distribution. Dry processing has low production costs, and the products are usually used as low-cost fillers in industries such as rubber, plastics and papermaking.
(2) The wet processing process generally crushes the raw ore, and then goes through mashing, desanding, cyclone classification, stripping, centrifuge classification, magnetic separation (or bleaching), concentration, pressure filtration, and drying. The product can be used for ceramic or paper coatings. If you prepare filler grade or paper coating grade kaolin, you need to increase the calcination process, that is, ore crushing, smashing, cyclone classification, peeling, centrifugal classification, concentration, pressure filtration, internal steam drying, calcination, depolymerization and so on.
(3) Calcining method: Calcining is a widely used method for producing special kaolin products. It has 4 calcination temperature ranges: 500~700℃, 925℃, 1000℃, 1400℃. Calcined at different temperatures, the application range of the obtained products is also different. Calcined kaolin with only hydroxyl removed is used as a filler for cable plastics and rubber seals; kaolin calcined at 1000°C can be used as a filler for paper instead of Tio2; after 1300~ The kaolin calcined at 1525°C can be used as the filler of refractory products and the lining of optical glass crucibles.
(4) Peeling method: In order to make paint-grade kaolin products, the thicker laminated kaolin must be peeled into thin slices. The peeling methods include wet grinding, extrusion and chemical soaking. ①Wet grinding method prepares kaolin into a slurry with a solid gas content of about 40%. After adding a dispersant, add grinding media (such as quartz sand, porcelain beads, glass beads, nylon polyethylene beads, etc.) to a grinding machine for a certain amount of grinding After time, sieving, and then precipitation classification. ②Extrusion method: Send the kaolin slurry to the high-pressure homogenizer, pressurize the high-pressure homogenizer to 20-35Mpa, and then spray it from the nozzle. Due to the sudden drop in pressure, the kaolin crystal layer "looses". The slurry sprayed at high speed is sprayed onto the impeller, and the direction of movement is suddenly changed, causing the loose crystal layer to peel off. ③Chemical agent soaking method: Soak the kaolin powder with a saturated solution of urea, and heat it to 30-80°C at the same time, add a small amount of dispersant to fully disperse the kaolin, and stir at high speed to peel off the crystal layer. Benzidine, acetamide, etc. can also be used instead of urea. The neutral aqueous solution of AlCl3 and Na2SiO3 are mixed in a ratio of 1:0.75 to 1:5 to produce precipitation. Dry at 110°C to obtain Al2O3·2SiO2·2H2O.
(5) The kaolin is ground fine, washed to remove the sand, treated with inorganic acid, washed with water to near neutral, and dehydrated at a temperature above 330℃
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