从提钒尾液制备磷酸锰铁锂正极材料的研究  

Preparation of lithium manganese iron phosphate cathode material from vanadium tailings

作　　者：李智宇 汤婷 王正豪 陈良 朱英明 吴可荆 罗冬梅[1] Li Zhiyu;Tang Ting;Wang Zhenghao;Chen Liang;Zhu Yingming;Wu Kejing;Luo Dongmei(School of Chemical Engineering,Sichuan University,Chengdu 610000,Sichuan,China;School of Metallurgy and Environment,Central South University,Changsha 410000,Hunan,China;Institute of New Energy and Low Carbon Technology,Sichuan University,Chengdu 610000,Sichuan,China)

机构地区：[1]四川大学化学工程学院,四川成都610000 [2]中南大学冶金与环境学院,湖南长沙410000 [3]四川大学新能源与低碳技术研究院,四川成都610000

出　　处：《钢铁钒钛》2024年第6期19-27,共9页Iron Steel Vanadium Titanium

基　　金：国家自然科学基金(51774205)。

摘　　要：以钒渣提钒过程中产生的富含铁锰的浸出液为原料,通过共沉淀法制备了二水草酸铁锰Mn_(0.5)Fe_(0.5)C_(2)O_(4)·2H_(2)O,以此为前驱体,通过高温固相法成功合成了磷酸锰铁锂LiFe_(0.5)Mn_(0.5)PO_(4)正极材料,实现了钒渣浸出液中铁锰资源的综合利用。结果表明,在初始p H值为3.5,温度25℃,反应时间90 min,草酸铵加料量为理论值的1.1倍,加料方式为正加的条件下,铁和锰的沉淀率分别为99.5%和99.4%,与其他杂质实现深度分离,Mn_(0.5)Fe_(0.5)C_(2)O_(4)·2H_(2)O的纯度达99.97%,且粒径较小,分散性良好。可将其作为合成磷酸锰铁锂正极材料的前驱体,为磷酸锰铁锂的工业化生产提供了思路。Using the iron-manganese-rich leaching solution generated during vanadium extraction from vanadium slag was used as the raw material,and ferromanganese oxalate dihydrate Mn_(0.5)Fe_(0.5)C_(2)O_(4)∙2H_(2)O was prepared by co-precipitation,and lithium ferromanganese iron phosphate LiFe_(0.5)Mn_(0.5)PO_(4) anode material was successfully synthesised by high-temperature solid-phase method using this precursor,which achieved the comprehensive utilization of the iron-manganese resources in the vanadium slag leaching solution.The results showed that under the conditions of initial pH 3.5,temperature 25℃,reaction time 90 min,ammonium oxalate addition 1.1 times of the theoretical value,and the addition mode of positive addition,the precipitation efficiency of Fe and Mn were 99.5%and 99.4%,respectively,and the depth separation from other impurities was achieved,and the purity of Mn_(0.5)Fe_(0.5)C_(2)O_(4)·2H_(2)O reached 99.97%with a small particle size and good dispersion.It can be used as a precursor for synthesizing lithium manganese iron phosphate cathode materials,which provides the idea for the industrialized production of lithium iron manganese phosphate.

关 键 词：钒渣浸出液 共沉淀法 草酸铁锰 磷酸锰铁锂 

分 类 号：TF841.3[冶金工程—有色金属冶金] TM911[电气工程—电力电子与电力传动]