A reduction leaching-removal-active magnesium oxide cobalt sink process was used to recover cobalt from a copper and cobalt oxide ore in DRC. The effects of the addition and dosage of the reducing agent sodium metabisulfite, the leaching reaction time, the removal reaction time, the addition and dosage of the cobalt sink active magnesium oxide and the reaction time of the cobalt sink were investigated.
The results showed that the cobalt leaching rate could reach 90.38% when the fineness of 74μm was 70%, the mass concentration of pulp was 33%, the pH value of the end point was 1.5~1.8, the sulfuric acid was added for 30 min, sodium metabisulfite was added, the dosage of sodium metabisulfite was 8kg/t ore, and the leaching was stirred for 5h. The residue of the leaching solution after the extraction of copper was removed with limestone+lime, The reaction is stirred for 6h at room temperature, the pH of the end point is about 5.8, the copper in the solution can be reduced to 0.04g/L after lime is added for 3h, the copper precipitation rate is 90.51%, the iron precipitation rate is 99.23%, the cobalt precipitation rate is 7.39%, the precipitation residue is returned to the leaching process to recover the copper and cobalt; the solution after decontamination is sunk by activated magnesium oxide, the activated magnesium oxide emulsion is added within 5min, when the magnesium oxide When the mass ratio of magnesium oxide to cobalt was 1.03 and the cobalt precipitation time was 5h, the cobalt precipitation rate reached 90.13% and the...
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