| abstract |
In the present invention, 1) cobalt salt solution and liquid caustic soda are added co-currently to a reactor containing a base solution and through which air passes, and the pH value of the system is controlled by controlling the flow amount of liquid caustic soda, and the co-precipitation reaction is performed under a constant stirring speed. After the reaction solution begins to overflow, the pH value of the reaction system decreases by 0.1 every hour until the pH value of the reaction system decreases to 9.5 and the flow rate of cobalt salt increases to 340 L/h, and the flow rate of cobalt salt is 20 L /h increasing, continuously monitoring the particle size, and obtaining a cobalt oxyhydroxide slurry; 2) obtaining dried cobalt oxyhydroxide by sequentially aging and drying the cobalt oxyhydroxide slurry; 3) calcining the dried cobalt oxyhydroxide to obtain battery grade cobalt tetraoxide; According to the method of the present invention, the tap density of the obtained battery grade cobalt tetraoxide can be much higher than that of tricobalt tetraoxide of the same particle size specification produced by the prior art. |