Fluoride Removal from Residual Solution of Waste Lithium Battery Recycling

With the widespread use of lithium batteries, the recycling of waste lithium batteries can not only reduce environmental pollution, but also recover valuable metals such as nickel, cobalt, manganese, and lithium from waste batteries, effectively alleviating resource shortages.

The current recycling and utilization of waste ternary lithium batteries generally involves dismantling, discharging, acid leaching, and other steps to obtain a positive electrode material leaching solution. The main components of the leaching solution are lithium, nickel, cobalt, and manganese. Many lithium battery recycling companies now use extraction methods to recover various valuable metals. After adding sodium chloride to the solution, TBP (tributyl phosphate) is used as the extractant, ferric chloride is used as the co extractant, and sulfonated kerosene is used as the diluent. During the extraction process, a large number of chloride ions complex with trivalent iron and combine with lithium ions, achieving extraction through coordinated hydrogen bonds and separation from magnesium.

After completing lithium extraction, the leakage of electrolyte caused by front-end discharge treatment results in the presence of some fluoride ions in the leachate, which are often carried into the extracted material solution. As there are still some lithium ions that can be recovered in this material solution, it is necessary to remove fluoride ions to ensure the service life of equipment and instruments and the quality of back-end products.

The HP3500 defluorination resin developed by Haipu for the new energy industry is an organic-inorganic nanohybrid material that has high defluorination accuracy (can be processed up to<1mg/L) when used in the new energy field. At the same time, it does not introduce other ionic impurities while defluorining, and most importantly, it does not cause loss of lithium and other valuable metals.

Physical and chemical performance indicators and operating parameters

*BV=Bed Volume, refers to the volume of adsorbent loading

This product is suitable for defluorination of lithium battery recycling materials, defluorination of various industrial production materials, treatment of fluorine-containing wastewater in the surface treatment industry, groundwater treatment, and defluorination of drinking water.