Removal of Chloride Ions from Spodumene Lithium Sulfate Feed Solution

Li2CO3, Lithium hydroxide and other lithium containing compounds are important raw materials for lithium-ion battery cathode materials. With the rapid development of the new energy vehicle industry, the demand for lithium resources is constantly increasing.

After calcination in a rotary kiln, lithium concentrate is processed into calcined material, which is then ball milled in a ball mill and roasted again with concentrated sulfuric acid to obtain acid clinker. The slurry is then filtered and washed with calcium carbonate powder through a filter to obtain lithium sulfate leaching solution. Sodium carbonate and sodium hydroxide are then added to the lithium sulfate leaching solution to adjust the pH and obtain lithium sulfate purification solution. After evaporation and concentration, lithium sulfate completion solution is obtained.

Subsequently, the configured sodium carbonate solution will be heated and lithium sulfate will be added to complete the lithium precipitation process. In addition, the production of lithium hydroxide using Li2CO3 can also be achieved through the process of causticization, or by directly reacting the lithium sulfate leaching solution with sodium hydroxide through a freezing process to precipitate sodium and produce lithium hydroxide.

However, due to the presence of chlorine in the production of sodium carbonate required for lithium deposition, the chlorine removal product developed by Haipu can effectively reduce the chlorine content in lithium sulfate feed solution. The chlorine content in raw water is around 1300, which can be reduced to below 500ppm after adsorption treatment with Haipu's chlorine removal resin product. At the same time, two-stage adsorption can reach below 100ppm.

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