The type and use of kaolin ore, the development opportunity

Natural kaolin ore output, according to its quality (physical and chemical properties), plasticity and sandy (such as quartz, feldspar, mica mineral particle size > 50 microns) content, generally can be pided into hard coal measures kaolin, soft kaolin and sandy kaolin three types.
Hard kaolinite hard, unplastically, pulverized, fine grinding and plasticity. Soft kaolin is soft, the plasticity is generally stronger, the sand content is less than 50%. The sandy kaolin is loose and malleable, and it is stronger than the sand, and the content of sand is greater than 50%. According to the types affect the industrial use of harmful impurities, crown "contain" the word (which allows content less than 5%) piding the types, such as pyritic hard kaolin, containing soft kaolin clay and organic matter containing limonite sandy kaolin, etc.
The types of kaolin ores affect the physical and chemical properties of kaolin. According to its texture, plasticity and quality fraction of sand, there are three types of kaolin ore industrial types.
The use of kaolin can be pided into kaolin and non-coal kaolin. Kaolinite is a kaolin deposited in coal. The kaolin deposits of coal are often found in the coastal marshes and the mountains or the intermountain basins. The seams are several kilometers long, hundreds of meters wide, and several meters thick. They are symbiotic with bauxite, coal, and sometimes the top floor of the coal seam. The ore is composed of flake kaolinite, with soft and hard. In addition to the soft mineral, some of it is white, because it is black or gray, but it can be whitened. The so-called "calcined kaolin" in commodity is the product of calcining of this kind of ore. Mountain west, shandong zhangli, liaoning benxi kaolin deposit, etc. (du zhenbao et al., 2010).
Coal measures kaolin with its single mineral composition, chemical composition, good dispersibility and pure, refractoriness, electrical insulation, chemical stability and calcined soil to pure, good abrasion resistance and high whiteness excellent physical and chemical properties, are widely used in various industrial fields. Generally speaking, the domestic coal series kaolin (hard kaolin) is suitable for the development of calcined kaolin, which is mainly applied to the fillings of various applications. Calcined kaolin is also used in papermaking because of its high whiteness, and it is expensive to produce high-grade coated paper. However, because the calcining soil mainly increases whiteness, it is generally not used alone, and the amount of water washed in papermaking is less.
Non-coal kaolin is also known as non-coal-bearing kaolin, generally soft kaolin and sandy kaolin, and its crystal structure is pided into single sheet (diameter ratio is 8:1), tubular and laminated. This type of kaolin deposit is usually exposed, and a few hydrothermal alteration deposit is needed. The processing methods mainly include the grading of dry grinding, water removing sand, gravity grading purification, magnetic separation iron removal, chemical removal, calcining whitening and superfine modification, etc.
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