In the copper removal process of PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC process, the added iron powder will consume a small amount of acid, so the ph value of the copper removal liquid will be increased to 3~3.5, which just meets the requirements of the ph value in the iron and aluminum removal reaction. The alkali metal carbonate was slowly added as the precipitant to make the fe3 + hydrolysis to form iron precipitate and al3 + hydrolysis to form aluminum precipitate.
With the addition of alkali carbonate, the pH of the reaction system is slowly increased, and when the pH rises to 4.0 to 4.8, the addition of alkali carbonate is stopped, when the fe3 + and al3 + precipitate completely. After 3~6h of filtration, get iron and aluminum slag and purification solution. PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC In the subsequent process, the purification solution can be extracted and other operations to obtain the ternary material precursor.
Further, the main components of iron and aluminum slag are sodium iron slag (na2 (fe6 (so4) 4 (oh) 12)) and sodium aluminum slag (na2 [al6 (so4) 4 (oh) 12]), and a small amount of hydroxide. The pH adjustment process of iron and aluminum removal reaction of PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC process should be completed within 1~2h. If the pH adjustment time is too short, it is easy to cause too high local pH value, and the cobalt and nickel form precipitation into the iron and aluminum slag and cause the loss.
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