Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1981-09-01
1983-08-09
Carter, Herbert T.
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
423 22, 423 27, 423 40, 75118R, 75121, C22B 300, C01G 5500, C01G 500, C01G 700
Patent
active
043976891
ABSTRACT:
The process comprises the steps of leaching the concentrate with hot hydrochloric acid and chlorine gas to dissolve most of the gold, platinum and palladium, treating the residue from the leaching step with an excess of an alkaline oxidizing agent to solubilize the ruthenium, slurrying the resulting solids in water, combining the precious metal values from the slurry with the liquor from the leaching step and releaching the resulting slurry with hot hydrochloric acid and chlorine. The leach liquor which is then separated from the remaining solids is a chloride solution which contains substantially all the platinum group metals and gold present in the concentrate.
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Paper Lonrho Process, L. Floyd, May 1978.
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Refining of Gold from Precious Metal Concentrates by Liquid-Liquid Extraction B. F. Rimmer, Chemistry & Industry, Jan. 19, 1974, pp. 63 to 66.
Countercurrent Extraction Separation of Some Platinum Group Metals, Part II E. W. Berg & E. Y. Lau, Analytica Chimica Acta, 27, 1962, pp. 248 to 252.
The Platinum Group Metals: Part 1, R. J. Dosing, May 1980, pp. 41 to 48, (Unique Properties are Irreplaceable in Modern Industry.
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Transcript of talk given by R. I. Edwards of NIM at the AIME Conference held in New York, May 1978.
Colton D. Frederick
Edwards Julian D.
Lea Richard K.
Carter Herbert T.
Inco Limited
Kenny Raymond J.
Mulligan,Jr. Francis J.
Steen Edward A.
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