Method of recovery of metal compounds and metals from nitrate so

Details Method of recovery of metal compounds and metals from nitrate so Method of recovery of metal compounds and metals from nitrate so

1975-08-11

1976-10-19

Ozaki, G.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75108, 75117, 75118R, 75120, 75121, 423 35, 423125, 423143, C22B 2300, C22B 1500, C22B 4700

Patent

active

039868664

ABSTRACT:
A method is provided for recovering metal compounds and metals from ores, concentrates, alloys and other metal containing materials. The material containing said metals is leached in an aqueous solution of nitric acid at atmospheric pressure and temperatures which may vary from ambient to the atmospheric boiling point. An inorganic salt is admixed or formed in the solution to raise the atmospheric boiling point of said solution. The solution is heated to evaporate the water and to increase the concentration of the salt. The atmospheric boiling point of the solution increases with an increase in the salt concentration and causes an evolution of nitric acid or nitrogen containing gas and the sequential precipitation of metal compounds as the boiling point of the solution increases. The solution is filtered after each sequential precipitation to recover the metal compound or mixture of metal compounds which have precipitated as aforesaid. Thereafter the metal compounds may be separated and treated by conventional means to produce a relatively pure metal or an alloy.

REFERENCES:
patent: 1150787 (1915-08-01), Rankin
patent: 2762703 (1956-09-01), Mancke
patent: 2916357 (1959-12-01), Schaufelberger
patent: 3211524 (1965-10-01), Hyde et al.
patent: 3240562 (1966-03-01), Brown et al.
patent: 3720749 (1973-03-01), Taylor et al.
patent: 3793429 (1974-02-01), Queneau et al.

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