Wet Recycling of Waste Lithium Batteries and Removal of Fluoride from Acid Leaching Solution

In the current wet recycling process of waste lithium batteries, electrode powder selectively leaches precious metals through acid leaching. The iron and aluminum ions in the leachate are often removed by adjusting the pH to form hydroxide precipitates, resulting in a large amount of solid waste iron and aluminum slag that is difficult to separate.

In addition, due to the leakage of electrolyte caused by front-end discharge treatment, there are some COD and fluoride ions in the leachate, which affects the service life of equipment and instruments and the quality of back-end products.

At present, mature methods for fluoride removal include coagulation precipitation, adsorption, ion exchange, etc.

Among these methods, finding a defluorination agent with high defluorination capacity, fast efficiency, and low cost is the key. Calcium salt is a widely used defluorination agent, which utilizes the precipitation of insoluble calcium fluoride to remove fluoride. However, in lithium chloride solution, it can only achieve rough defluorination and cannot achieve deep defluorination; The method of adding aluminum sulfate to the neutral leaching solution of lithium mica ore for adsorption and defluorination is also proposed, but this method requires a large amount of investment, has high defluorination costs, and can cause difficulties in pressure filtration, which is not conducive to production.

The HP3500 highly selective defluorination adsorbent developed by Haipu is an organic-inorganic nanohybrid adsorbent material. By utilizing the Donna membrane effect, the surface functional groups of polymer materials are pre enriched with fluoride ions, and then fluorine is removed through the use of fluorine removal nanomaterials within the polymer. Therefore, HP3500 has high selectivity and accuracy in adsorbing fluoride ions.

HPF3500 is suitable for: defluorination of lithium battery recycling solution; Groundwater defluorination; Fluoride removal from drinking water; Fluoride removal from various industrial production fluids; Fluorine containing wastewater treatment in the surface treatment industry.

If a new energy material technology research and development company needs to remove fluoride from the lithium containing liquid produced during the production process, our company's relevant specialized adsorption materials are selected to adsorb the liquid based on its characteristics, difficulties, and treatment requirements. The effluent can meet customer requirements, and the wastewater design indicators are shown in the table below.

*Wastewater Design Parameter Table

*Adsorption processing data