A total of 14 million tonnes of chromite ore is extracted. Chromium ores are mined today in South Africa, Zimbabwe, Finland, India, Kazakihstan and the Philippines. Chromium (IV) oxide (CrO 2) is used to manufacture magnetic tape.Ĭhromium is mined as chromite (FeCr 2O 4) ore. Chromium is used in metallurgy to impart corrosion resistance and a shiny finish as dyes and paints, its salts colour glass an emerald green and it is used to produce synthetic rubies as a catalyst in dyeing and in the tanning of leather to make molds for the firing of bricks. Chromium plating was once widely used to give steel a polished silvery mirror coating. ApplicationsĬhromium main uses are in alloys such as stainless steel, in chrome plating and in metal ceramics. Chromium is unstable in oxygen, it immediately produces a thin oxide layer that is impermeable to oxygen and protects the metal below. It does not tarnish in air, when heated it borns and forms the green chromic oxide. Its colour is silver-gray and it can be highly polished.
Separation and Concentration Purification RequestĬhromium - Cr Chemical properties of chromium - Health effects of chromium - Environmental effects of chromiumĬhromium is a lustrous, brittle, hard metal.Plant Inspection & Process Optimalisation.
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