Reclamation process for tungsten carbide/cobalt using acid diges

Details Reclamation process for tungsten carbide/cobalt using acid diges Reclamation process for tungsten carbide/cobalt using acid diges

1996-07-17

1998-03-17

Simmons, David A.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75414, 75419, 75425, 75709, 75710, B22F 900

Patent

active

057281971

ABSTRACT:
Tungsten carbide cobalt and tungsten-containing materials are recycled using a single high-temperature oxidation with standard dilution chemistry. The scrap material is ground, oxidized, and subjected to an acid digestion, preferably in hydrochloric acid. This causes the cobalt to form cobalt chloride while the tungsten remains insoluble. The pH is then increased to about 7.0 which causes the cobalt chloride to form cobalt hydroxide which precipitates out of solution. The cobalt and tungsten are separated and dissolved in a high-pH ammonia solution which can then be spray dried to form a precursor powder for subsequent carburization to form tungsten carbide-cobalt powders.

REFERENCES:
patent: 3887680 (1975-06-01), MacInnis et al.
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patent: 4798708 (1989-01-01), Ladd et al.
patent: 4851041 (1989-07-01), Polizzotti et al.
patent: 5230729 (1993-07-01), McCandlish et al.
patent: 5352269 (1994-10-01), McCandlish et al.
patent: 5417945 (1995-05-01), Gingerich et al.
patent: 5599514 (1997-02-01), Gardano et al.

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