基金the financial support on this research from the Talent Training Program of Yunnan Province, China (No. 202005AC160041)the Major R&D Project of Yunnan Province of China (No. 202002AB0800020102)。
文摘采用湿法冶金从废旧LiFePO_(4)正极粉末中回收有价金属锂和铁,回收产物作为原料制备磷酸铁锂。通过优化浸出工艺参数,在丙酮酸浓度为3.0 mol/L、H_(2)O_(2)体积为2 m L、固液比为0.1 g/m L、反应温度为80℃以及反应时间为20min的条件下,Li的浸出效率达到96.56%。采用XRD、XPS、FE-SEM和EDS对浸出残渣进行表征。结果表明,浸出残渣为FePO_(4),Fe/P摩尔比为0.974。将浸出液的pH值调整到12.0,并在80℃搅拌2 h后,浸出液中的Li通过原位沉淀以Li_(3)PO_(4)形式回收,其纯度为96.5%(质量分数)。丙酮酸/H_(2)O_(2)溶液浸出Li的反应动力学数据符合Avrami模型(R^(2)>0.95)。Li浸出过程的活化能较低,表明扩散限制浸出过程中的反应速率。
基金Projects(22068021,52064030)supported by the National Natural Science Foundation of ChinaProject(202305AC160064)supported by the Yunnan Young and Middle-aged Academic and Technical Leaders Reserve Talent Program,ChinaProjects(202202AG050011,202202AG050007)supported by Yunnan Major Scientific and Technological Program,China。
基金the National Key R&D Program of China(Nos.2018YFC1901805,2018YFC1901801)the Reserve Talents of Young and Middle-aged Academic and Technical Leaders in Yunnan Province,China(No.2018HB009)+1 种基金the Program for Innovative Research Team in University of the Ministry of Education of China(No.IRT-17R48)the Major Project of Science and Technology Department of Yunnan Province,China(No.2019ZE007).
基金the financial supports from the National Natural Science Foundation of China(No.U1902219)the Yunnan Young and Middle-aged Academic and Technical Leader Reserve Talent Project,China(No.2018HB009)+1 种基金the Yunnan Outstanding Youth Science Foundation,China(No.202101AV070007)the Major Science and Technology Projects in Yunnan Province,China(Nos.2019ZE007,202002AB080002)。
