Neutralization treatment method of nickel and cobalt precipitation post-liquid
A treatment method, nickel deposition technology, applied in the improvement of process efficiency, recycling of waste collectors, lithium carbonate;/acid carbonate, etc., can solve problems such as easy crystallization and difficult process
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Embodiment 1
[0014] 1) Calcining the nickel-cobalt lithium manganese oxide positive electrode material at 300-600°C, the calcination residence time is about 5-10min; prepare 200-250g / L dilute sulfuric acid solution, add the calcined positive electrode material, the solid-liquid ratio is 100-120g: 1L, raise the temperature to 90-100°C, and react for 2 hours to obtain a low-manganese leaching solution and leaching residue.
[0015] 2) Raise the temperature of the low-manganese leaching solution to 60°C, slowly add solid oxalic acid, the amount added is 1.4 times the mass required by the theory of nickel-cobalt precipitation, and react for 2 hours to obtain the nickel-cobalt oxalate solid and the solution after nickel-cobalt precipitation, after nickel-cobalt precipitation The nickel content in the liquid is less than 0.2g / L, the cobalt content is less than 0.4g / L, and the manganese content is less than 0.01g / L.
[0016] 3) Neutralize the solution after precipitation of nickel and cobalt with...
Embodiment 2
[0018] 1) Calcining the nickel-cobalt lithium manganese oxide positive electrode material at 300-600°C, the calcination residence time is about 5-10min; prepare 200-250g / L dilute sulfuric acid solution, add the calcined positive electrode material, the solid-liquid ratio is 100-120g: 1L, raise the temperature to 90-100°C, and react for 2 hours to obtain a low-manganese leaching solution and leaching residue.
[0019] 2) Raise the temperature of the low-manganese leaching solution to 70°C, slowly add solid oxalic acid, the amount added is 1.4 times the mass required by the theory of nickel-cobalt precipitation, and react for 1 hour to obtain nickel-cobalt oxalate solid and nickel-cobalt-precipitated liquid, after nickel-cobalt precipitation The nickel content in the liquid is less than 0.2g / L, the cobalt content is less than 0.4g / L, and the manganese content is less than 0.01g / L.
[0020] 3) Neutralize the solution after precipitation of nickel and cobalt with solid calcium hyd...
Embodiment 3
[0022] 1) Calcining the nickel-cobalt lithium manganese oxide positive electrode material at 300-600°C, the calcination residence time is about 5-10min; prepare 200-250g / L dilute sulfuric acid solution, add the calcined positive electrode material, the solid-liquid ratio is 100-120g: 1L, raise the temperature to 90-100°C, and react for 2 hours to obtain a low-manganese leaching solution and leaching residue.
[0023] 2) Raise the temperature of the low-manganese leaching solution to 90°C, slowly add solid oxalic acid, the amount of which is 1.4 times the mass required for the precipitation of nickel and cobalt theory, and react for 1 hour to obtain the nickel-cobalt oxalate solid and the liquid after precipitation of nickel and cobalt, after precipitation of nickel and cobalt The nickel content in the liquid is less than 0.2g / L, the cobalt content is less than 0.4g / L, and the manganese content is less than 0.01g / L.
[0024] 3) Neutralize the solution after precipitation of nic...
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