Na2SO4-NaCl binary eutectic salt roasting to enhance extraction of lithium from pyrometallurgical slag of spent lithium-ion batteries

• 作者: Hui Dang Zhidong Chang Xue Wu Sihang Ma Yifei Zhan Na Li Wenbo Liu Wenjun Li Hualei Zhou Changyan Sun
• 来源期刊: 中国化学工程学报（英文版）
• 年，卷（期）: 2022,（1）
• 所属期刊栏目: Separation Science and Engineering
• 页码范围: 294-300
• 页数: 7页
• 语种: 英文

摘要

Effectively extracting lithium at a relatively low temperature from the slag produced by the pyrometal-lurgical treatment of spent lithium-ion batteries remains a great challenge,which limits the acquirement of lithium.Herein,we proposed a eutectic system to roast slag at a lower temperature based on sodium sulfate-sodium chloride (Na2SO4-NaCl) binary eutectic salts.The optimal roasting conditions are as fol-lows:the slag was roasted at 750 ℃ with a (SO42-+Cl-)/Li+ molar ratio of 5:1 for 120 min.Followed by aqueous leaching 5 min at room temperature with a water/roasted samples mass ratio of 30:1,it can get 97.07％ lithium extraction efficiency.