Continuous preparation of pure metals by gaseous reduction

Details Continuous preparation of pure metals by gaseous reduction Continuous preparation of pure metals by gaseous reduction

C - Chemistry, Metallurgy

22

B

53/378

C22B 5/00 (2006.01) B22F 9/00 (2006.01)

Patent

CA 1046290

Abstract of the Disclosure A process for continuously recovering metal powders of high purity from aqueous solutions of the salts thereof which comprises conditioning the aqueous solution to attain a selected free ammonia to metal mole ratio in the general range of from 0.0:1 to about 6:1, depending upon the solution used and the metal to be reduced, then continuously passing the solution through a tubular reactor under steady state conditions in modified plug flow in which localized, limited backmixing occurs, while continuously charging a reducing gas to the reactor in countercurrent flow with respect to the solution to agitate the solution as it passes through the reactor, and to continuous- ly reduce selected metal ions to yield insoluble metal powder. A temperature gradient is preferably maintained over at least a portion of the length of the tubular reactor from ambient temperature at the point of charging the leach solution to a temperature preferably exceeding 200°F at a location spaced from the ambient temperture point.

219008

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