ChromiteProfileChromite is an oxide of iron and chromium whose chemical formula corresponds to FeCr2O4. As it does not contain H2O in its molecular structure, chromite is anhydrous. the only one that has commercial use. Chromium has a wide range of applications in metallurgical and chemical processes. When used in the production of iron, steel and other alloys, chromite improves hardness and the ability to resist the effects of corrosion and oxidation. Due to these properties, it is a key element in the manufacture of stainless steel. In the automotive and heavy industrial sectors, refractory chromite is used in its granular form to make ferrous and non-ferrous castings. Chromite sands derive their high refractoriness from low wettability and good chemical stability. With a melting point of 2,150ºC and low thermal expansion, the bloating caused by the oxidation of FeO compounds helps seal the moldings. In addition, the high density and thermal conductivity of this ore promote rapid solidification of castings.ApplicationOf the world's total chromite production; about 94% are cast into ferrochrome alloys. China is the world's largest consumer of chromite with around 70% of total production. Major stainless steel producers, such as Japan, the United States, Germany and India, account for the remainder. In the chemical industry, sodium chromate is used to make various chemicals, including pigments in paints, plastics and ceramics. In addition, chromite is an important medium of paper ......... which involves obtaining the powdery substance and then roasting it at 1700°–2200°C. Before this operation, the zirconium oxide material is subjected to stabilization by melting at 1700 °C and adding 5 to 7% CaO or MgO. This converts the main body of the zirconia into the cubic phase. The cooked briquettes are then ground in a ball mill until they reach a particle size of less than 10 millimeters. Then the powder is washed with diluted HCl to remove impurities and used to form a casting slip. Drying produces a 2-4% shrinkage and after baking an additional contraction of approximately 15% occurs. Fused stabilized zirconia can also be produced using an electric arc process with a final product containing more than 90% of the particles in the cubic phase. In this form, zirconium oxide is able to withstand repeated thermal cycles and a maximum temperature of 2400°C under oxidizing conditions..