Fluoride Removal from Lithium Battery Recycling Solution

The rapid development of society has made batteries an important electronic consumer product. The widespread use of batteries has brought great convenience to our daily lives, but at the same time, it has also brought a series of problems. The recycling and disposal of waste batteries is of great significance from both the perspectives of resource utilization and environmental protection. The electrolyte in waste batteries generally contains a certain amount of fluoride ions, so when waste batteries are discarded without treatment, it will cause permanent pollution to the water resources and soil at the disposal site.

In summary, the recycling and reuse of lithium resources is also an important issue. The recycling of various waste batteries is of paramount importance in lithium resource recovery. At present, waste batteries in China mainly rely on wet extraction. Due to the presence of electrolyte in waste batteries and limitations in the process flow, it is inevitable that fluoride ions will accumulate during the preparation of lithium salt compounds, resulting in serious problems such as excessive fluoride content and environmental pollution.

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 special adsorption material researched by Haipu Company can selectively separate fluoride ions or nickel ions from the lithium battery recycling solution, which not only reduces the cost input for enterprises, but also effectively protects the environment, thus achieving resource recycling and reuse.

Process flowchart

Scope of application

Treatment of lithium battery wastewater for nickel and fluoride removal.

Advantage

1. Efficiently remove fluoride and nickel from wastewater with high removal efficiency, without affecting the concentration of other ions, and can be used for purification treatment at the end of wastewater discharge or before reuse; 2. The process flow is simple, the footprint is small, and the fixed investment cost is low. 3. High degree of automation and simple operation. Adsorption processing data: