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Calcium carbide
Calcium carbide is an inorganic compound, white crystals, industrial products are gray-black lumps, and the cross section is purple or gray. It reacts violently when encountering water, generating acetylene and releasing heat. Calcium carbide is an important basic chemical raw material, mainly used to produce acetylene gas. Also used in organic synthesis, oxyacetylene welding, etc. Physical and chemical properties: The ore is a yellowish-brown or black blocky solid, and the pure product is a white crystal (the one with higher CaC2 is purple). It has a density of 2.22 g/cm3 and a melting point of 2300°C (related to the content of CaC2). It immediately reacts violently when it meets water to generate acetylene and release heat. The melting point changes with different calcium carbide content.
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Bauxite
The main component of bauxite is alumina, which is hydrated alumina containing impurities and is a kind of earthy mineral. White or off-white, brownish yellow or light red due to iron content. Density 3.45g/cm3, hardness 1~3, opaque and brittle. Extremely difficult to melt. Insoluble in water, soluble in sulfuric acid and sodium hydroxide solution. Mainly used for smelting aluminum and making refractory materials.
The composition of bauxite is extremely complex, and it is a general term for a variety of hydrous alumina ore with extremely different geological sources. Such as boehmite, diaspore and gibbsite (Al2O3·3H2O); some are composed of diaspore and kaolinite (2SiO2·Al2O3·2H2O); some are mainly composed of kaolinite and follow The increase in the content of kaolinite constitutes general bauxite or kaolinite clay. Bauxite is generally formed by chemical weathering or exogenous effects. There are few pure minerals, and always contain some impurity minerals, more or less clay minerals, iron minerals, titanium minerals and detrital heavy minerals. -
Chamotte
Chamotte is a high-quality hard refractory clay produced in Zibo, Shandong Province, China. The standard Al2O3 content of chamotte ore is 38%, after calcination the Al2O3 content is about 44%, and Fe2O3<2%. The composition is stable, the texture is uniform, the structure is dense, and the section is shell-shaped and white. It is used to produce high-quality clay refractory materials. The technical term is the first-grade hard clay clinker, the main chemical components are AL2O3 and SiO2, accompanied by a small amount of Fe2O3 and trace amounts of Na2O and K2O. The main mineral is kaolin.
The chamotte we call generally refer to CALCINED CLAY. . The content of Al2O3 in the calcined chamotte is about 44%, and the content of Fe2O3 is not more than 2%. The composition is stable, the texture is uniform, the structure is dense, and the section is shell-shaped.
The common colors of chamotte after high temperature calcination are: pure white, light gray, light yellow brown, and a small amount of brown iron sheet.
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Andalusite
Andalusite is an aluminosilicate mineral, which is the raw material for making refractory materials and porcelain in spark plugs. It is a typical mineral of low-grade thermal metamorphism, and is commonly found in mudstones in contact with metamorphic zones. It is mainly formed under the conditions of high geothermal gradient and low pressure to temperature ratio.
Andalusite is generally columnar crystal, and its cross section is almost square. Andalusite crystals gather together into radial or granular shapes. People often call the radial andalusites “chrysanthemum stones”, which means that they are like the petals of a chrysanthemum.
