Product description, Product introduction: Cryolite is double salt of sodium fluoride and aluminum fluoride. The chemical formula is 3AaF·A1F3. Cryolite stone is soft, waxy luster, hardness is 2.5 to 3, the gravity is from 2.95 to 3.01, and the color is white. The cryolite can improve process performance, improve friction coefficient and extend the service life of lining. The character of Fluorite: Cryolite is of natural and artificial two kinds. Natural cryolite is associated with granite.Producing method of producing artificial cryolite is as below: adding the sulfuric acid in fluorite, heating to make it produce hydrogen fluoride, and then make the sodium aluminate react to made cryolite. In addition, the phosphate rock also can be the raw material to produce artificial cryolite. In the process of manufacture phosphate fertilizer, recycle fluorine from the ore, and react with sodium hydroxide, then make the aluminum hydroxide react to make cryolite. property: Na content : 33 % min Al content: 112.5% min P content: 52% min SiO2 content: 0.25% max grade:200mesh,325mesh sieving rate: 97%