Method for recovering slag after lithium extraction of lithium iron phosphate material

The invention provides a lithium iron phosphate material lithium extraction slag recovery method, which comprises: 1) carrying out alkali liquor treatment on the lithium extraction slag to obtain a liquid phase product and a solid phase product; 2) firing the solid-phase product to obtain iron oxide; and 3) reacting the iron oxide with phosphoric acid to obtain the iron phosphate. The recovery method provided by the invention has the characteristics that iron and aluminum elements can be separated, and high-purity iron phosphate can be prepared. 本发明提供一种磷酸铁锂材料提锂后渣的回收方法，该回收方法包括以下步骤：1)对所述提锂后渣进行碱液处理，得到液相产物与固相产物；2)对所述固相产物进行灼烧处理，得到氧化铁；3)使所述氧化铁与磷酸进行反应，得到磷酸铁。本发明提供的回收方法具有可分离铁铝元素，制得高纯度磷酸铁的特点。