A kind of preparation method of battery grade cobalt carbonate and prepared cobalt carbonate
A cobalt carbonate and battery-level technology, applied in the field of electrochemistry, can solve the problems affecting the recovery rate of cobalt carbonate preparation and increase the difficulty of mother liquor wastewater treatment, so as to achieve the effect of reducing the content of cobalt metal, reducing the difficulty of treatment, and improving the utilization rate
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[0035] A method for preparing battery-grade cobalt carbonate, comprising the steps of:
[0036] 1) Prepare cobalt salt aqueous solution with cobalt metal concentration of 80-100g / L and ammonium bicarbonate aqueous solution with concentration of 250-300g / L;
[0037] Exemplarily: the cobalt salt aqueous solution may be an aqueous cobalt chloride solution or an aqueous cobalt sulfate solution;
[0038] The cobalt metal concentration of the cobalt salt aqueous solution can be 85g / L, 90g / L, 95g / L;
[0039] The concentration of the ammonium bicarbonate aqueous solution can be 250g / L, 270g / L, 280g / L;
[0040] 2) Take 10-30L of the ammonium bicarbonate aqueous solution obtained in step 1) and add it to the reaction kettle, and raise the temperature to 40-60°C;
[0041] Exemplarily: the addition amount of described ammonium bicarbonate aqueous solution can be 15L, 20L, 25L;
[0042] The reaction temperature can be 45°C, 50°C, 55°C;
[0043] The temperature rise here is a slow tempe...
Embodiment 1
[0053] Example 1 A preparation method of battery-grade cobalt carbonate
[0054] A method for preparing battery-grade cobalt carbonate, comprising the steps of:
[0055] 1) Prepare cobalt chloride aqueous solution with cobalt metal concentration of 90g / L and ammonium bicarbonate aqueous solution with concentration of 250g / L respectively;
[0056] 2) Take 20L of the ammonium bicarbonate aqueous solution obtained in step 1) and add it to the reaction kettle, and raise the temperature to 50°C at a rate of 0.4°C / min;
[0057] 3) Add the cobalt chloride aqueous solution obtained in step 1) into the reaction kettle of step 2) under continuous stirring, stop adding when the pH value in the reaction kettle is 7.4, the stirring speed is 170 rpm, and add chlorine The flow rate of the cobalt aqueous solution is 3L / h;
[0058] 4) After the cobalt salt aqueous solution is added, raise the temperature in the reactor to 80°C under stirring, keep it warm for 20 minutes, and let it stand for...
Embodiment 2
[0061] Example 2 A preparation method of battery-grade cobalt carbonate
[0062] A method for preparing battery-grade cobalt carbonate, comprising the steps of:
[0063] 1) Prepare cobalt sulfate aqueous solution with cobalt metal concentration of 85g / L and ammonium bicarbonate aqueous solution with concentration of 270g / L;
[0064] 2) Take 15L of the ammonium bicarbonate aqueous solution obtained in step 1) and add it to the reaction kettle, and raise the temperature to 40°C at a rate of 0.3°C / min;
[0065] 3) Add the cobalt sulfate aqueous solution obtained in step 1) into the reaction kettle of step 2) under continuous stirring, stop adding when the pH value in the reaction kettle is 7.2, and add cobalt sulfate at a stirring speed of 150 rpm The flow rate of aqueous solution is 2L / h;
[0066] 4) After adding the cobalt salt aqueous solution, raise the temperature in the reactor to 70°C under stirring, keep it warm for 30 minutes, and let it stand for aging;
[0067] 5) A...
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