In the metallurgical industry, Chrome Concentrate (India) is mainly used to produce ferrochrome and chrome. Chrome ore as steel, ferrochrome expected to add production of a variety of high strength, corrosion resistant, high temperature oxidation-resistant special steel, such as stainless steel, acid-resistant steel, heat resistant steel, ball bearing steel, spring steel, tool steel, etc. .
Chromium is silver-white metal, hard and brittle. Density 7.20 g / cc. Melting point 1857 ± 20 ℃, boiling point 2672 ℃. Valence +2, +3 and +6. Ionization energy of 6.766 eV. Chromium in acid generally surface passivation its features. Once you go after passivation, which is easy to dissolve in almost all inorganic acids, but insoluble in nitric acid. Chromium is soluble in sulfuric acid, which is not soluble in nitric acid. By water vapor at high temperature oxidation of carbon monoxide at 1000 ℃ is oxidized. At high temperature, chromium reacts with the nitrogen and is eroded by molten alkali metal.
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