Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group vib metal
Patent
1987-07-06
1990-10-09
Russel, Jeffrey E.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group vib metal
423 57, 75711, 75743, C01G 3900, C01G 4100, C22B 300
Patent
active
049619101
ABSTRACT:
Methods are disclosed for recovering one or more of the metals of tungsten and molybdenum from metal-cellulose material. One method involves digesting the material in a mineral acid selected from the group consisting of hydrochloric acid having a concentration of at least about 4 normal, and sulfuric acid having a concentration of at least about 9 normal at a temperature of at least about 50.degree. C. for a sufficient time to form a digestion solid containing the major portion of the tungsten and a digestion solution containing a portion of any molybdenum which is present in the material, and separating the solid from the solution. Another method involves having as the starting material a metal-cellulose material comprising one or more of the metals of tungsten and molybdenum and elements selected from the group consisting of arsenic, phosphorus, silicon, and combinations thereof. The digestion is carried out as described above to form a digestion solution containing the major portion of any tungsten and molybdenum which is present, and a residue, followed by separating the digestion solution from the residue.
REFERENCES:
patent: 3307938 (1967-03-01), Ronzio et al.
Li, K. C., "Chemical Processing Tungsten Ores and Concentrates" Journal of Metals, Jun. 1962, pp. 413-417.
Perry, Robert H., Perry's Chemical Engineers' Handbook 6th Ed., Pub. by McGraw-Hill, NY, New York (1984) pp. 19-71, 19-72.
Powers John A.
Vanderpool Clarence D.
Bos Steven J.
Castle D. R.
GTE Products Corporation
Quatrini L. Rita
Russel Jeffrey E.
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