Recovery of Tungsten From Ferrotungsten-I

Description of The Preferred Embodiments

A method is provided whereby tungsten values are recovered from ferrotungsten by completely oxidizing the ferrotungsten at high temperatures in an oxygen atmosphere followed by digestion with sodium hydroxide to form soluble sodium tungstate. The sodium tungstate is then purified by conventional means. The method may be used to recover at least about 90% of the tungsten values present in the ferrotungsten.

For a better understanding of the present invention, together with other and further objects, advantages and capabilities thereof, reference is made to the following disclosure and appended claims taken in conjunction with the above-described drawings.

A method for the recovery of tungsten from ferrotungsten has been developed whereby at least about 90% of the tungsten may be recovered from ferrotungsten scrap. The method is comprised of calcining the ferrotungsten at a high temperature in an oxygen containing atmosphere. During calcination, an oxygen containing gas is flowed through the calciner to promote oxidation. Calcining is continued until the ferrotungsten becomes completely oxidized. The oxidized ferrotungsten is then digested using sodium hydroxide to form a soluble sodium tungstate, Na₂ WO₄. Once in solution, the Na₂ WO₄ can then be purified and processed by conventional hydrometallurgical techniques. Examples of such hydrometallurgical techniques can be found in U.S. Pat. Nos. 4,360,502 to MacInnis, 4,369,165 to Kim, 4,552,729 to Miller, and 2,339,888 to Smith which are incorporated herein by reference.


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