Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group ib metal
Patent
1979-06-11
1980-11-04
Hearn, Brian E.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group ib metal
423 37, 423 41, 423 50, 423 87, 423140, 423150, 423605, 423559, 423 95, 423 98, 423561R, C01G 312, C01G 2120, C01G 4502, C01G 5311
Patent
active
042319935
ABSTRACT:
A multi-step process for recovering metal values from lead smelter matte. The matte is mixed with sulfuric acid and manganese oxide and leaching is effected at atmospheric pressure to form an aqueous solution including dissolved metal sulfates and a residue containing sulfur and lead sulfate. The sulfur is removable by conventional means and the lead sulfate may be returned to the smelter. The pH of the aqueous sulfate solution is adjusted to 3.5 to 4.5 to precipitate ferric iron and arsenic and pH is readjusted to about 3.0 to redissolve coprecipitated copper. After separation from the precipitate, the aqueous solution is mixed with a sulfiding agent, such as sodium sulfide at a pH of not more than 3 to selectively precipitate copper sulfide. After separating the copper sulfide, the aqueous solution is mixed with further sulfiding agent at a pH of 3 to 4.5 to form a cobalt-nickel sulfide precipitate in which the weight ratio of copper-nickel to sulfur is 1.8. After separation of the precipitate, the pH of the solution is adjusted to 3 to 7 to form a manganese sulfate slurry. The slurry is reacted with oxygen at a temperature of 25.degree.-75.degree. C. to form a manganese-containing precipitate. The precipitate is separated from the brine and heated in a furnace to form manganese oxide which is recycled to the leaching step. The brine is also recycled to the leaching step as a source of sulfuric acid.
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Hebble Terry L.
Sandberg Richard G.
Brown William S.
Gardiner Donald A.
Hearn Brian E.
The United States of America as represented by the Secretary of
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