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Title: WO9600801A1: PRECIOUS METAL EXTRACTION PROCESS[French]
[ Derwent Title ]


Country:
Kind:
WO World Intellectual Property Organization (WIPO)
A1 INTERNATIONAL APPLICATION PUBLISHED WITH INTERNATIONAL SEARCH REPORT i

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17 pages

 
Inventor: MARTENSON, Irvin;
MATHIS, Samuel, A.;

Assignee: MARTENSON, Irvin
MATHIS, Samuel, A.
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Published / Filed: 1996-01-11 / 1995-03-24

Application Number: WO1995US0003734

IPC Code: Advanced: C22B 3/10; C22B 3/44; C22B 3/46; C22B 11/00;
IPC-7: C22B 3/44;

ECLA Code: C22B3/10; C22B3/46; C22B11/04;

Priority Number:
1994-06-28  US1994000266563

Abstract:     There is disclosed a process useful for the extraction of gold, silver, and the platinum metals from precious metal containing ores which poses no threat to the environment or the ground water. The process utilizes sodium bromide, sodium chloride, and potassium monopersulfate to react with a water slurry of the precious metal containing ore which has been reduced to a minimum particle size of 250 mesh (10). The leaching out of the gold, silver, and platinum metals occurs when the oxidation-reduction potential is maintained at +600 to +900 with the pH at 3.2 to 3.6 (18). After the precious metals have been dissolved into solution, the ore tailings are filtered (22) and discarded (23). The pregnant leach liquor is pumped to a holding tank (24) where it is subsequently reacted with a solution of sodium hydroxide and sodium borohydride at a pH of 8.2 to 8.6 and the oxidation-reduction parameter held at -550 to -650. A black suspension of the mixed precious metals precipitate out of solution where it is collected (30) and transferred to the refinery for separation and purification by standard procedures. The "barren" leach liquor filtrate is then electrically treated (32), and make-up chemicals of sodium bromide, sodium chloride, and potassium monopersulfate are added for re-use with the next ore batch. [French]

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Description
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+ PRECIOUS METAL EXTRACTION PROCESS
+ BACKGROUND OF THE INVENTION
    FIELD OF INVENTION
+ BRIEF DESCRIPTION OF THE INVENTION
    This invention comprises a method for the extraction of gold, silver, and the platinum metals (ruthenium, rhodium, palladium, osmium, iridium,. and platinum) from precious-metalcontaining ores by the use of low cost and relatively small quantities of common chemicals, non-toxic to the environment or ground water. There are no corrosive chemical odors. The first step of the method is comminution of the precious-metalbearing ores to increase the surface area of the ore and to form a water slurry containing two weight parts water to one part ore. The next step of the method comprises the addition, to the ore slurry, an extraction composition containing sodium bromide, sodium chloride, and potassium monopersulfate under conditions of pH and oxidation-reduction potentials, which will effect extraction of the precious metals as non-toxic, water- soluble metal salts.

       
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Other Abstract Info: CHEMABS 122(24)295785W DERABS C95-138801

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