Steam Coal
Steam coal (sometimes called thermal coal) is a grade of coal used in electric power plants to generate steam to create electricity. Most of the coals mined in the United States are steam coals. Steam: Coking coal, also known as metallurgical coal, has low sulfur and phosphorus content and can withstand high heat.
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Coltan is a dull black metallic ore from which the elements niobium and tantalum are extracted. The niobium-dominant mineral in coltan is columbite, and the tantalum-dominant mineral is the tantalite.
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Coal is a nonrenewable fossil fuel that is combusted and used to generate electricity. Mining techniques and combustion are both dangerous to miners and hazardous to the environment. Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other elements, chiefly hydrogen, …
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Arsenic is a chemical element with the symbol As and atomic number 33. Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal. Arsenic is a metalloid. Allotropes: grey (most common), yellow, black … Atomic number (Z): 33 CAS Number: 7440-38-2 Natural occurrence:
