Method for combined recovery of waste ternary lithium battery positive electrode powder and lithium iron phosphate battery positive electrode powder

The invention relates to a method for combined recovery of waste ternary lithium battery positive electrode powder and lithium iron phosphate battery positive electrode powder. The core of the method is to realize the combined recovery of the waste ternary positive electrode material by using a power battery positive electrode active substance lithium iron phosphate with reducibility under an acidic condition as a reducing agent, a leaching, coprecipitation and high-temperature solid-phase method recovery route is constructed, and a complete closed-loop recovery process is completed. And finally, the purposes of high-selectivity lithium recovery and ternary positive electrode material regeneration are achieved. 本发明涉及一种废旧三元锂电池正极粉与磷酸铁锂电池正极粉联合回收的方法。该方法的核心是在酸性条件下具有还原性的动力电池正极活性物质磷酸铁锂作为还原剂实现废旧三元正极材料的联合回收，构建了浸出+共沉淀+高温固相法回收路线，完成了一条完整的闭环回收工艺。最终实现高选择性回收锂和再生三元正极材料的目的。