Suzanne L. Kladder - Colorado Springs CO Terrence W. Mattioli - King of Prussia PA Gary E. Geiger - Richboro PA James E. Cressman - Alamosa CO
Assignee:
Betz Laboratories, Inc. - Trevose PA
International Classification:
C22B 346
US Classification:
75735
Abstract:
A method for improving the yield of gold and silver from a Merrill-Crowe recovery process where the presence of copper effects yield. The method involves the addition of a substoichiometric amount of ethylenediaminetetraacetic acid in combination with a phosphonate and polyacrylic copolymer scale control agent. The method also reduces zinc consumption and controls scaling in the stripping circuit.
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