The process and production practice of nickel and cobalt production from activated magnesium oxide i

About 20% of the cobalt is still not recovered in one section of the cobalt precipitation process, and this process uses lime neutralization and precipitation to recover the cobalt in the liquid after one section of cobalt precipitation:

Ca(OH)2+CoSO4=Co(OH)2↓+CaSO4

At the same time, under the alkaline environment, part of magnesium sulfate will react with lime to form magnesium hydroxide.

Ca(OH)2+MgSO4=Mg(OH)2↓+CaSO4

The operating conditions are: under the condition of 60℃ and constant stirring, a slurry of cooked lime (slurry concentration ~20%) is continuously added to the second stage cobalt precipitation reaction tank. In order to ensure the complete precipitation of cobalt recovery, the solution endpoint pH should be controlled at about 8.

The cobalt slurry produced after the second-stage cobalt precipitation is filtered, mixed with the extracted residue to adjust the slurry and sent to the iron removal process to re-enter the process.

The typical composition of the second stage cobalt precipitation solution and…

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