Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1980-05-05
1981-08-11
Hearn, Brian E.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75101BE, 75108, 75109, 75118R, 75120, 75121, 423 22, 423 24, C22B 1104, C22B 1304, C22B 2500
Patent
active
042832241
ABSTRACT:
A hydrometallurgical process is provided for the separative treatment of electrometallurgical anode slime containing precious metals and substantial amounts of tin dioxide and lead sulfate. The process is especially suited for treatment of anode slimes from the electrorefining of secondary copper to recover about 85% of the metal value contained therein, especially tin and precious metals. First, lead is separated by leaching the slime with diethylene triamine followed by carbonation to precipitate lead carbonate with subsequent regeneration of the leach solution. Second, tin is separated by leaching the undissolved residue from the amine leach with a solution of hydrochloric acid and chlorine to dissolve substantially all substances except tin dioxide. Third, the pregnant leach solution is contacted with an exchange resin substantially selective to adsorption of precious metals except silver followed by cementation of silver from the depleted leach solution by copper addition with subsequent regeneration of the leach solution. Fourth, the loaded resin is elutriated followed by cementation of precious metals from the loaded eluate with silver from the previous step and recycling the silver-enriched solution for cementation of silver.
REFERENCES:
patent: 2082487 (1937-06-01), Frick
patent: 2950964 (1960-08-01), Forward
patent: 4047939 (1977-09-01), Morrison
patent: 4145212 (1979-03-01), Bodson
patent: 4229270 (1980-10-01), Subramanian
Green et al., U.S. Bureau of Mines, Report of Investigations, 7358.
Hanegan Herbert M.
Hearn Brian E.
Peacock Frank A.
Southwire Company
Tate Stanley L.
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