The pH value of alkali aqueous solution can make the pH change of the solution in the process of PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC regulation more uniform, which is not easy to cause high local pH value, and the amount of cobalt and nickel into the coarse copper powder is less. An aqueous solution of sodium hydroxide or potassium hydroxide is preferably used. Iron and aluminum removal reaction: the oxidant is added to the resulting copper removal solution to oxidize Fe 2 + to Fe 3 +.
The alkali metal carbonate was then added to the PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC reaction system to hydrolysis fe3 + and al3 + to form a precipitate. The reaction system was insulated and aged and filtered to obtain iron and aluminum slag and purification solution. Oxidants are sodium chlorate or hydrogen peroxide. Equation for the oxidation reaction:
6feso4+3h2so4+naclo3＝3fe2(so4)3+nacl+3h2o(2)
2feso4+h2so4+h2o2＝fe2(so4)3+2h2o(3)
Because sodium chlorate and hydrogen peroxide are highly oxidized, the addition will affect the subsequent precipitation process. Through many experiments, the applicant found that the actual amount of oxidant was controlled at 1.05~1.15 times of the theoretical amount, which could ensure that the fe2 + in the copper removal liquid was fully oxidized. Meanwhile, the residual oxidant in the copper removal liquid had little influence on the subsequent reaction, and PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC iron removal had a good effect.
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