Tungsten Ore Information-I

Tungsten is a rare acid-forming heavy metal found chiefly in the tungstates of iron and calcium, wolframite and scheelite.  Tungsten is not found native, but is produced in the form of a greyish-black powder, which when fused has a specific gravity of 19.25, virtually the same as gold at 19.3. I recent years some cases of gold plated tungsten bars masquerading as gold have surfaced. The name tungsten was first used by Cronstedt, and signifies "heavy stone." The chief ore is wolfram, which is usually associated with cassiterite, and for a long time the effective separation of these minerals was a matter of some difficulty. Tungsten minerals were once recovered from tungsten ores by mechanical concentration using their density. A better process was developed, using both by electromagnetic separation, followed by roasting the crushed ore with sodium carbonate, by which operation sodium tungstate is formed, and the tin ores can be removed. In the case of several tin mining companies the presence of wolfram enables profits to be made, which but for the "mixed minerals" would be impossible.




 

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