Method of improving precious metal yield in a Merrill-Crowe reco

Details Method of improving precious metal yield in a Merrill-Crowe reco Method of improving precious metal yield in a Merrill-Crowe reco

1992-01-03

1993-06-01

Andrews, Melvyn J.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75737, 423 29, C22B 346

Patent

active

052155749

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.

REFERENCES:
patent: 3033675 (1962-05-01), Hedley
patent: 4701262 (1987-10-01), Chen
patent: 5061459 (1991-10-01), Bennett et al.
"Development of a New Process to Control Scale In the Strip Circuit at the Homestake McLaughlin Mine", Society for Mining, Metallurgy & Exploration, Inc. Preprint No. 90-15 1990.
"Computer Controlled Merrill-Crowe Processing", R. M. van Zyl, Engineering and Mining Journal, Apr. 1983.

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