废旧三元正极材料葡萄糖还原焙烧优先提锂工艺

Priority Recovery of Lithium from Spent Ternary Cathode Materials by Reduction Roasting with Glucose

以废弃三元锂离子电池正极材料(spent-NCM)为研究对象,葡萄糖(C_(6)H_(12)O_(6))为焙烧剂,采用焙烧—水浸工艺实现锂的选择性优先浸出。结果表明,在600℃焙烧90 min、C_(6)H_(12)O_(6)与spent-NCM质量比25%、浸出液固比20 mL g的条件下,spent-NCM中的有价金属元素转变为水溶性的Li_(2)CO_(3)和不溶性的Ni、Co和MnO,焙烧产物经水浸可选择性优先分离Li,Li的浸出率为95.62%。

Lithium was selectively and preferentially extracted from ternary cathode materials of spent ternary lithium-ion batteries(spent-NCM)by roasting with glucose(C 6H 12 O 6)-water leaching process.Under the optimum roasting conditions of roasting at 600℃for 90 min,mass ratio of C_(6)H_(12)O_(6)to spent-NCM of 25%,and L S ratio of 20 mL g,the valuable metal elements in spent-NCM are transformed into water-soluble Li_(2)CO_(3)and water-insoluble Ni,Co and MnO respectively.Li can be selectively and preferentially separated by water leaching with leaching rate of 95.62%.