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Business Manager Wu Wenju
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Chromite powder is a magmatic mineral, which is often produced in superbasic rocks and coexists with olivine; it is also found in sand ore. It looks like magnetite in appearance, and is generally a massive or granular aggregate. In the metallurgical industry, chromite is mainly used to produce ferrochrome and metallic chromium. Ferrochrome as a steel additive produces a variety of high-strength, corrosion-resistant, wear-resistant, high-temperature, and oxidation-resistant special steels. Metal chromium is mainly used for smelting special alloys with cobalt, nickel, tungsten and other elements. Chromite is a scarce mineral species with small reserves and low output. In the industry, ferrochrome, chromium spinel, chromium-rich spinel, hard chromium spinel and other similar minerals are often collectively referred to as chromite.
Chromite is a mineral whose main constituents are oxides of iron, magnesium and chromium: (Fe, Mg) Cr2O4, which is a type of spinel. It is a mineable chrome ore, with a complex mineral composition, uncertain magnesium content, and sometimes aluminum and iron elements. There are about 30 kinds of chromium-containing minerals in nature, but only chromite has industrial value, and chromite, aluminite and chromium-rich spinel are common in China.
Chromite is refractory, used as refractory, and also used to make chromium compounds such as chromium trioxide, sodium dichromate, potassium dichromate and so on.
Chromite is an oxide mineral of chromium and iron. There are high-carbon ferrochromium (containing 4 to 8% carbon), medium-carbon ferrochromium (containing 0.5 to 4% carbon), low-carbon ferrochromium (containing 0.15 to 0.50% carbon), and micro-carbon ferrochrome (containing carbon to 0.06%), ultra-fine carbon ferrochrome (less than 0.03% carbon), metallic chromium, silicon chromium alloy. It is quite hard and has a black semi-metallic sheen. Chromite is the main source of metallic chromium and can also be used in high temperature refractory materials. Chromite is generally a lumpy or granular aggregate. The chemical composition of chromite is FeCr2O4, an oxide mineral of the crystallographic equiaxed system. The iron in the composition can often be partially replaced by magnesium. When Mg is mainly used, it is called magnesiochromite. With a normal spinel structure. Chromite Cr2O3 content is 67.91%. Is the main source of industrial chromium, can also be used to make high temperature refractory materials, such as chromium brick. The Morse hardness is 5.5 to 6, and the specific gravity is 3.9 to 4.8. With weak magnetism. Chromite is only produced in ultrabasic or basic rocks. Large chromite deposits are mainly produced in Transvaal, South Africa, near Guylow in Zimbabwe, Svidlovsk region in Russia, and Cuba. China's chromite ore is produced in Tibet, Gansu, and Shaanxi.
Magnesia-chrome bricks and chrome-magnesia bricks are used in metallurgy, glass and cement industries. Due to the use of chromium-containing products in cement rotary kiln, hexavalent chromium compounds will be generated. For environmental protection reasons, they are gradually replaced by magnesium-aluminum spinel products or dolomite products. In addition, it is used for refining metallic chromium, producing ferrochrome, stainless steel, and manufacturing dichromate.