When the lithium ion solution is added, the temperature of the copper removal solution is 30~60℃, then the copper removal solution is heated to 80~90℃, and then the alkali metal carbonate is added. The effect of heating up is to make the precipitation fully flocculation into large particles, the precipitation effect is better, and remove iron and aluminum more thoroughly. The alkali metal carbonate is sodium carbonate or potassium carbonate. Its use as PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC precipitant has the advantages of safe and easy control of pH.
Through several tests, it was found that the precipitation of fe3 + and al3 + was more complete, so sodium carbonate is preferably used in the PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC process. Commonly used sodium hydroxide or ammonia as precipitation agent, the reason of sodium hydroxide is too alkaline, near the titration end point will cause a sharp change in pH value,
Therefore, the titration is more demanding and it is not easy to reach the desired ph range. Although ammonia is weak alkali, ammonia is volatile and toxic, which is irritating and corrosive to the eye, nose and skin. The highest allowable concentration in the air is 30 mg/m3, so it is not suitable as a precipitating agent for PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC process.
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