Process for comprehensive recovery of copper-cobalt-containing sulfuric acid slag
A sulfuric acid slag, copper-cobalt technology, applied in the direction of photographic process, photographic auxiliary process, process efficiency improvement, etc., can solve the problems of affecting quality, waste, high sulfur content of metallized pellets, etc., and achieve the effect of improving quality
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[0019] Example 1
[0020] The invention is applied to the sulphuric acid slag produced in the acid production of a certain pyrite concentrate in Congo. The copper grade of the sulfuric acid slag is 0.5%, the cobalt grade is 0.06%, and the iron grade is 68.54%.
[0021] (1) Bioleaching
[0022] The sulphuric acid residue was subjected to biological leaching, the pH value was maintained at 2.0, the pulp concentration was 25%, and the Sulfobacillus thermosulfiooxidans 6Y-1 strain was inoculated for leaching. The reaction cycle was 3 hours, the temperature was 65°C, and the continuous leaching method was adopted. The leaching rate of copper and cobalt both reached 85%.
[0023] (2) Recovery of copper in the leachate
[0024] The concentration of copper in the leaching solution is above 0.5g / L, and M5640 is used for extraction. The extraction ratio (v / v) A:O=4:1, three-stage countercurrent extraction, sulfuric acid (180g / L) reverse extraction ratio (v / v) O:A=2:1, enter the electrowinning...
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