Recycling method for selectively extracting lithium from lithium iron phosphate waste

The invention discloses a recovery method for selectively extracting lithium from a lithium iron phosphate waste material, and belongs to the field of waste lithium battery recovery. According to the chelating agent, 1, 5-diamino biuret and (E)-3-([2, 2 '-bipyridyl]-4-yl) sodium acrylate are subjected to an addition reaction, a bipyridyl-containing biuret ligand is obtained, and a trace amount of lithium can be chelated out. And the extraction rate of lithium is improved, and the leaching rate is as high as 99.53%. 本发明公开了一种磷酸铁锂废料选择性提锂的回收方法，属于废旧锂电池回收领域。本发明的螯合剂采用1，5-二氨基缩二脲与(E)-3-([2，2′-联吡啶]-4-基)丙烯酸钠发生加成反应，得到含联吡啶的缩二脲配体，可以将微量的锂鳌合出来。提高了锂的提取率，浸出率高达99.53％。