PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC Iron and aluminum removal reaction of iron removal process: add sodium chlorate as the oxidant to the copper removal liquid, and the actual amount of oxidant is 1.1 times of the theoretical amount. The reaction system was then warmed to 85℃ and an aqueous solution saturated with sodium carbonate was added to allow the fe3 + and al3 + hydrolysis to form a precipitate.
When the ph value rose to 4.5, the reaction system was aged for 3h and filtered to obtain the iron-aluminum slag and purification solution. The use of carbonate to adjust the pH value in the copper removal reaction will lead to the early precipitation of iron and aluminum, and reduce the subsequent removal rate of iron and aluminum. PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC In the iron and aluminum removal reaction of the iron removal process, if the temperature of adding the precipitant is too low, the iron and aluminum removal effect is poor. Using sodium carbonate precipitated better than potassium carbonate.
If sodium hydroxide or ammonia is used to replace the alkali metal carbonate, the removal rate of iron and aluminum is not much different, but nickel and cobalt will enter the iron and aluminum slag more often, and the operation is more difficult, and has a great impact on the environment. When the pH value of the precipitation endpoint is reduced, the removal effect of iron and aluminum is poor; the removal effect is good, but nickel and cobalt will enter the iron-aluminum slag more, and the loss of nickel and cobalt is large. Therefore, the iron and aluminum removal reaction of PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC iron removal process needs to maintain a moderate pH value.
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