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A process for recovering from bearing ores comprises producing a concentrate from the and leaching the concentrate at atmospheric pressure in a strong mineral acid solution, for example, a solution of sulfuric acid, hydrochloric acid or nitric acid within a temperature range of from 40° to 90 Centigrade for from one to four hours in the presence of an inorganic ...read more
In 1783 Spanish chemists Juan José and Fausto Elhuyar obtained metallic by reduction of oxide with carbon it was named wolfram hence chemical symbol, W for mineral wolframite, from which it was extracted. In 1847, Robert Oxland patented in Britain manufacturing process for sodium , tungstic acid, and pure metal, and in 1857, he patented process for producing …read more
and processing. . mining methods used depends on physical and chemical properties of mineral, tonnage and grade, physical form in which it occurs, geometry and depth of orebody. common methods are surface or open pit mining and sub-surface or underground mining, or a combination of both.read more
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