Recycling Valuable Metals by Wet Process of Waste Power Wall Battery

Wet process recovery of valuable metals is the use of hydrometallurgy to recover valuable metal elements in waste Power wall Battery cathode materials. The waste li-ion battery positive electrode material is leached by a leaching agent, and elements such as lithium, iron, and phosphorus enter the solution in the form of ions. After the leaching solution is removed and purified, the lithium and iron elements are separated and recovered. Lithium is generally recovered as lithium carbonate and lithium phosphate, while iron is generally recovered as iron phosphate and iron hydroxide. The leaching agents are mainly inorganic acids, such as sulfuric acid, nitric acid, hydrochloric acid, etc. There are also reports of leaching with organic acids. The oxidizing agent usually uses hydrogen peroxide. According to the different leaching forms of valuable metals, the wet process recovery of waste Power wall Battery can be divided into wet full component leaching and wet selective leaching of lithium.

Here is the content list:

Wet full component leaching method

Wet selective lithium leaching method

Wet full component leaching method

Wet full-component leaching usually uses an acid solution to leach both lithium and iron into the solution, and then separates lithium and iron by chemical precipitation and other methods and recovers them. This method can obtain high-purity lithium salts and iron salts and can realize the recovery of all components of waste solar charger battery cathode materials. The wet full-component leaching process can realize the full-component recovery of waste Power wall Battery cathode materials and has the advantages of a high metal recovery rate and high purity of recovered products.

Wet selective lithium leaching method

Since the current wet full-component leaching process of Power wall Batteries has problems such as the use of a large number of reagents, resulting in low economic benefits, there is an urgent need to develop a low-cost wet recovery process. The wet selective leaching lithium process usually only selectively leaches lithium, leaving the iron in the leaching residue, and one-step leaching can obtain lithium solution and iron phosphate. This method has attracted much attention due to its low reagent consumption and simple process, and researchers have done a lot of research work in this area. Compared with the wet full-component leaching process, the wet selective lithium leaching process has the advantages of a higher lithium leaching rate, complete separation of lithium and iron, low reagent consumption, low energy consumption, and a short process. The prospect of industrial application is great, but it is necessary to consider how to make high-value utilization of leached slag iron phosphate.

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