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Tungsten occurs in the normal state hardly in the type of chemical compounds with additional elements. Even though more than 20 tungsten manner minerals are ...

Chromium Mining, Chromium Mine, Chromium… Chromium is mined as chromite (FeCr2O4) ore. About 2/5ths of the chromite ores and concentrates in the world are ...

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Named from the Greek word meaning "color", chromium is a lustrous, hard, bluish-gray metal. It can be polished to a mirror-like finish and is often used as

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Coal ash leaches chromium in amounts that can greatly exceed EPA’s threshold for hazardous waste at 5000 parts per billion (ppb), 6 and

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