A low-grade cobalt ore was used as raw material, and the co, mn, fe, al2o3 and mgo contents of this low-grade cobalt ore were 0.41%, 0.36%, 2.53%, 9.28% and 3.64%, respectively. In the industrial test of efficient recovery of cobalt from this low-grade cobalt ore activated magnesium oxide, the following steps were included in sequence.
The first leaching step: add the supernatant of the slurry bank to adjust the leached ore to a concentration of 30% slurry, then add concentrated sulfuric acid and reducing agent, in the control of the leaching process of sulfuric acid mass concentration of 8g/l and redox potential of 340mv, the reaction 360min, the end of the reaction solid-liquid separation, to obtain the cobalt-containing liquid 1 and leaching slag, leaching slag sent to the slurry bank for stockpiling;
The second step of iron removal: add two-stage cobalt slag to the cobalt-containing liquid 1, react for 20min under air-filled condition, then add low-grade cobalt ore finely ground to -0.074mm particle size with 80% by mass, react for 90min under air-filled condition, control the end ph value of iron removal reaction to 4.2, separate solid-liquid at the end of reaction, get cobalt-containing liquid 2 and neutralized slag, and return the neutralized slag to the first step of leaching process;
The third step of manganese removal: add special oxidant to cobalt-containing liquid 2, control the redox potential of 1250mv, remove manganese reaction for 60min, solid-liquid separation at the end of...
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