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Chromium ore

How is chromium extracted from its important ore?

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Chromium ore

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  1. Chromium Ore How is chromium extracted from its important ore?

  2. What is Chromium • Chromium's name comes from the Greek word "chroma" which means "color." • Chromium is a chemical element. • Its symbol is Cr and atomic number is 24. • It is a steely-grey, lustrous, hard and brittle transition metal. • Chromium is also highly valued as a metal that is able to be highly polished while resisting tarnishing.

  3. Uses of Chromium • Chromium is used as a pigment in paint, ink, dye & Cosmetics. • The familiar yellow lines painted down the center of highways and the yellow paint used on school buses are often "chrome yellow" - a color produced from chromium pigment. • Chromium is a metal used to induce hardness, toughness, and chemical resistance in steel. • Thin coatings of chromium alloys are used as platings on auto parts, appliances, and other products. These are given the name "chrome plated." • Chromium is a metal used to induce hardness, toughness, and chemical resistance in steel. The alloy produced is known as "stainless steel."

  4. Chromite Ore Processing Low-grade ore obtained from an open cut trench at a chromite deposit near Auburn, Calif., was treated in the laboratory using gravity-magnetic separation and flotation beneficiation techniques. Flotation using known methods, however, gave very poor results and will not be discussed further in this report. Tabling of the ore followed by upgrading the tabled chromite concentrate using magnetic separation to remove magnetite gave far superior results. The results and discussion of gravity-magnetic separation tests on the Auburn ore follow.

  5. How is chromium extracted from its important ore? Process of extracting chromium from a chromium ore or concentrate by oxidation, which comprises suspending the chromium ore or concentrate in a bath of molten salts and introducing an oxygen-containing gas into the suspension in a sufficient amount and for a sufficient amount of time to oxidize chromium therein. A process for extracting chromium in the form of a chromate from ore or concentrate by the suspension oxidation thereof to the chromate state which comprises suspending finely crushed ore or concentrate containing the chromium in a molten liquid bed of an alkali metal salt in the ratio of 1 part by weight of ore to 5 to 20 parts by weight of salt; subjecting the suspension to agitation with an oxygen-containing gas at a temperature and for a time sufficient to convert the chromium to alkali metal chromates; and leaching with water to separate out the water soluble chromates from insoluble residue.

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