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The name tungsten (which means ' heavy stone ' in Swedish and was the old Swedish name for the mineral scheelite and other minerals of similar density) is used in English, French, and many other languages as the name of the element, but wolfram (or volfram) is used in most European (especially Germanic and Slavic) languages and is derived from ...
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Demand for high grade wolfram, after the development of tungsten as a lamp filament in 1904, and for molybdenite for use in patent alloys, led to an early interest in rare metals by British firms, the most prominent being George G. Blackwell and Sons of Liverpool. Prices in 1904 for both metals were high - up to £200 per ton for molybdenite ...
Making a ton of primary aluminum consumes at least 12,500 kW-hr, and most plants consume 14,500 to 15,000 kW-hr per ton of primary aluminum. [18] Secondary production of a given unit of aluminum requires about 10% of the electricity of primary production. The United States mined production of bauxite for primary aluminum production is ...
"Wolfram" is an alternate name for tungsten, a strategic material used in anti-tank weapons and machine tools. Most of the wolframite mines in Europe, such as the Barruecopardo mine, are in northwestern Spain and northern Portugal. [a] The high demand for this scarce strategic mineral in war time had created a bubble in prices, with the ...
Nyamuliro represents one of the largest tungsten reserves in Uganda having estimated reserves of 10 million tonnes of ore grading 0.5% tungsten. [ 2 ] The mine was taken over by KI3R Minerals Ltd, a subsidiary of Kerilee Investments, in 2016 from Krone Uganda Ltd. [ 3 ]
Another catalytic use of tungsten is as a De-NO X catalyst which is used in the treatment of nitrogen oxide emissions to convert harmful nitrogen oxides into inert N 2 gas. [14] Another modern day use of tungsten is as a lubricant. Tungsten disulfide (WS 2) is a lubricant with a dynamic coefficient of friction of ~0.03. Tungsten disulfide can ...
Scheelite is a calcium tungstate mineral with the chemical formula Ca W O 4.It is an important ore of tungsten (wolfram). Scheelite is originally named after Swedish chemist Carl Wilhelm Scheele (1742–1786).
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