Preparation method for cell grade cobalt hydroxide
A cobalt hydroxide and battery-level technology, applied in the direction of cobalt oxide/cobalt hydroxide, etc., can solve the problem of small particle size, shorten the reaction cycle and improve the reaction efficiency
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[0017] The preparation method of the battery-grade cobalt hydroxide of the embodiment of the present invention comprises the following steps:
[0018] Step S01: using ammonia solution as the bottom liquid;
[0019] Step S02: injecting nitrogen gas into the bottom liquid;
[0020] Step S03: adding sodium hydroxide solution, cobalt salt solution, ammonia solution and nitrogen into the bottom solution in parallel to react to obtain cobalt hydroxide;
[0021] Step S04: washing and drying the cobalt hydroxide.
[0022] Specifically, the reaction device in the above process may be a reaction kettle.
[0023] Specifically, in step S01, the ammonia concentration of the bottom liquid is 3-20 g / L, the pH of the bottom liquid is 9.8-12.8, and the temperature of the bottom liquid is 50-70°C. The ammonia concentration of bottom liquid among the present invention all refers to the NH in every liter of bottom liquid 3 mass (w / v).
[0024] The above-mentioned ammonia concentration can be...
Embodiment 1
[0046] Step S01: using ammonia solution as the base liquid.
[0047] The ammonia concentration of the bottom liquid is 20g / L, the pH of the bottom liquid is 12.8, and the temperature of the bottom liquid is 70°C.
[0048] Step S02: Infuse nitrogen gas into the bottom liquid.
[0049] Step S03: adding sodium hydroxide solution, cobalt salt solution, ammonia solution and nitrogen gas into the bottom solution in parallel to react to obtain cobalt hydroxide.
[0050] Wherein, the mass concentration of sodium hydroxide in the sodium hydroxide solution is 32%, the ammonia concentration in the ammonia solution added in parallel is 10%, and the concentration of cobalt salt in the cobalt salt solution is 180g / L.
[0051] Step S03 is divided into two stages, wherein,
[0052] The first stage is: when the D50 particle size of cobalt hydroxide is less than 10 μm, control the flow rate of cobalt salt solution to 250L / h, the flow rate of sodium hydroxide solution to 100L / h, the flow rate ...
Embodiment 2
[0059] Step S01: using ammonia solution as the base liquid.
[0060] The ammonia concentration of the bottom liquid is 15g / L, the pH of the bottom liquid is 11.9, and the temperature of the bottom liquid is 55°C.
[0061] Step S02: Infuse nitrogen gas into the bottom liquid.
[0062] Step S03: adding sodium hydroxide solution, cobalt salt solution, ammonia solution and nitrogen gas into the bottom solution in parallel to react to obtain cobalt hydroxide.
[0063] Wherein, the mass concentration of sodium hydroxide in the sodium hydroxide solution is 25%, the ammonia concentration in the ammonia solution added in parallel flow is 20%, and the concentration of cobalt salt in the cobalt salt solution is 120g / L.
[0064] Step S03 is divided into two stages, wherein,
[0065] The first stage is: when the D50 particle size of cobalt hydroxide is less than 10 μm, control the flow rate of cobalt salt solution to 200L / h, the flow rate of sodium hydroxide solution to 150L / h, the flow ...
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