During roasting, in addition to alkali metal can react with sulfuric acid to produce soluble corresponding sulfate, other iron, aluminum, calcium, magnesium, etc., also react with sulfuric acid to produce corresponding sulfate. Although some impurities in the clinker can be removed during the leaching process, the remaining impurities remain in the leaching solution, and it is necessary to continue to purify and remove PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC field to ensure the quality of the product.
The leaching solution was purified by alkaline calcium removal method, and the pH value was increased to 11 ~ 12 by alkalizing lime milk (containing CaO100 ~ 150g/L), so that magnesium and iron were hydrolyzed into hydroxide precipitation. Then sodium carbonate solution (containing Na2CO3 300g/L) is reacted with calcium sulfate to produce calcium carbonate precipitation, and PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC field is used to remove the iron in the leaching solution and the calcium brought in by the alkalizing agent lime milk. The alkaline calcium removal slurry is separated by liquid-solid, and the obtained solution is the purification liquid, the calcium-lithium ratio is less than 9.6×10-4, and the filter cake is the calcium slag, which is returned to the slurry for leaching.
Due to the low concentration of lithium sulfate and the low precipitation rate of lithium, the purification liquid can not be directly used for lithium precipitation or lithium chloride, and it is necessary to adjust the purification liquid with sulfuric acid to pH6 ~ 6.5, and evaporate and concentrate through the three-effect evaporator, so that the concentration of lithium sulfate in the concentrated liquid can reach 200g/L(including Li2O 60g/L). The concentrated liquid is separated by press filtration, the filtrate is used in the process of PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC, and the filter cake is returned to the pulp after the slag is finished.
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