Kaolin Crushing and Grinding System,Machines for Sale
Kaolin(also called Kaolinite) is is a clay mineral, part of the group of industrial minerals, with the chemical composition Al2Si2O5(OH)4. It is a layered silicate mineral, with one tetrahedral sheet linked through oxygen atoms to one octahedral sheet of alumina octahedra. Rocks that are rich in kaolinite are known as kaolin or china clay. --wikipedia.
Kaolin is used in a variety of industries, including paper manufacture, ceramics, and paint formula tions. Papermaking uses a large amount of kaolin clay, and crude kaolin is not useful as a mined product until it is processed to remove impurities.
In Georgia, kaolin deposits are normally lo cated and mapped from exploratory cores to depths typically from a few tens to about 200 feet. During mining, the overburden is stripped from one to a few acres to expose the kaolin layer. No water is used in actual drilling, but up to 1,000 gallons per core may be used in explo ration and mine development.
Relatively large volumes of water are used at kaolin processing plants, which are usually lo cated some distance from the mining area. Mined kaolin is usually slurried near the mine and transported to processing facilities through a pipeline as a clay suspension dispersed in water. Although processing methods vary with the run-of-mine clay quality and the end use for the processed clay, they usually include suspension or dispersion (deflocculation), screening, grit removal (e.g., gravity separa tion, centrifugation), flotation, brightening (e.g., magnetic separation, oxidation), floccu lation, filtration, drying, and packaging.
Water usage varies with the specific operations needed to refine the clay for its end use, but a nominal estimate from one source indicates typical usage is ~2,000 gallons per ton of fin ished product. Approximately 80 percent of the finished kaolin shipped to the paper industry is in slurry form, which is 70 percent kaolin and 30 percent water.
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