Citric Acid → Sodium Hydroxide

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A cobalt sulfate solution (1 mol/L) and sodium hydroxide solution (5 mol/L) were prepared respectively. To the cobalt sulfate solution, citric acid was added. The resultant mixture and the sodium hydroxide solution were simultaneously added into a reactor by a cocurrent method, and allowed to react at 50° C. with pH value at 10.5. Hydrogen peroxide was charged uniformly as an oxidant, and the amount thereof was 1.3 times that needed for completely oxidizing the generated cobalt hydroxide. After reaction completion, the solution was aged for 10 hrs at a constant temperature, dried at 110° C., and roasted at 350° C. for 10 hrs to yield spherical tricobalt tetraoxide with diameter D50 of 7.2 μm and tap density of 2.7 g/cm3.

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