Membrane processes for metal recovery and pollution control...

Details Membrane processes for metal recovery and pollution control... Membrane processes for metal recovery and pollution control...

H - Electricity

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H01M 10/54 (2006.01) B01D 61/44 (2006.01) C02F 9/00 (2006.01) C22B 7/00 (2006.01) C22B 15/00 (2006.01) C22B 26/10 (2006.01)

Patent

CA 1249885

MEMBRANE PROCESSES FOR METAL RECOVERY AND POLLUTION CONTROL IN METAL PROCESS INDUSTRIES- ABSTRACT OF THE DISCLOSURE: A process for the treatment of an aqueous stream containing an acid or base and typically a pre- cipitatable material such as a metal ion comprises: (a) subjecting the aqueous stream to (i) a treatment to produce a relatively pure stream of water and a concentrated aqueous stream, and (ii) water splitting to produce a stream of base, a stream of acid and a dilute aqueous stream of a concentration lower than the concentrated aqueous stream, the treatments (i) and (ii) being effected in either order, (b) recycling at least part of the pure water stream produced in (a)(i) to an earlier stream either in the production leading to said aqueous stream or to step (i) or (ii), (c) recycling at least part of the acid and/or base streams produced in (a)(ii) to an earlier stream either in the production leading to said aqueous stream or to an earlier step in the process, and (d) recycling at least part of the lower con- centration stream produced in (a)(ii) to either (a)(i) or to another step in the process, whereby, when present, only the precipitatable material is removed from the aqueous stream, thereby obviating toxic waste disposal problems.

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