Recovery of platinum-group metals from ores

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United States of America Patent

PATENT NO 4337226
SERIAL NO

06233422

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Abstract

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Metal values are recovered from ore concentrates by means of dry grinding, followed by a two-stage leaching process in which the ground concentrate is first leached with sulfuric acid at a temperature of about 90.degree. to 100.degree. C. to selectively leach nickel and iron. The residue is then leached with a solution comprising sulfuric acid and NaOCl or H.sub.2 O.sub.2 to extract platinum, palladium, copper and gold.

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Patent Owner(s)

Patent OwnerAddress
UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE INTERIORBRANCH OF PROCUREMENT AND PATENTS DIVISION OF GENERAL LAW OFFICE OF THE SOLICITOR DEPARTMENT OF THE INTERIOR 1849 C STREET N W MS 6531 WASHINGTON DC 20240

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Gomes, John M Reno, NV 10 142
Peasley, Edward R Orangevale, CA 1 12

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