Liquid purification or separation – Processes – Liquid/liquid solvent or colloidal extraction or diffusing...
Patent
1987-04-30
1990-01-23
Cintins, Ivars
Liquid purification or separation
Processes
Liquid/liquid solvent or colloidal extraction or diffusing...
204103, 204151, 210639, 210651, 210663, 210670, 210684, 210688, 210912, 423 99, 423100, 423371, 423372, B01D 1301, C02F 900
Patent
active
048956597
ABSTRACT:
A method for recovery of metal and cyanide from plating baths and rinse waters includes formation of hydrogen cyanide by acid treatment of such solutions, followed by HCN removal through diffusion across a microporous membrane. The method is applicable in a system wherein soluable metal cyanides and metal cyanide complexes are concentrated through use of a basic anion exchange system. Free hydrogen cyanide is released from the anion exchange system by means of an acid regenerant. In a preferred application of the invention, HCN, once having diffused through the microporous membrane, is neutralized with sodium hydroxide, to form a sodium cyanide solution that can be returned to a plating bath.
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QUESTAR brochure.
Cussler, Jr. Edward L.
Semmens Michael J.
Cintins Ivars
Regents of the University of Minnesota
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