三氯化铬溶液中铁的分离研究  

Study on separation of iron from chromium trichloride solution

作　　者：李树琦 李欣倩 冯海涛[1,2] 李波 牛峥嵘[1,2] 董亚萍 LI Shuqi;LI Xinqian;FENG Haitao;LI Bo;NIU Zhengrong;DONG Yaping(Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining 810008,China;Qinghai Engineering and Technology Research Center of Comprehensive Utilization of Salt Lake Resources,Xining 810008,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院青海盐湖研究所,中国科学院盐湖资源综合高效利用重点实验室,青海西宁810008 [2]青海省盐湖资源综合利用工程技术中心,青海西宁810008 [3]中国科学院大学,北京100049

出　　处：《无机盐工业》2023年第8期91-94,101,共5页Inorganic Chemicals Industry

基　　金：青海省重大科技专项(2016-GX-A10)。

摘　　要：铁铬液流电池具有循环寿命长、稳定性高、成本低等特点,在大规模电能储存领域应用日趋广泛。针对铁铬液流电池失效电解液的回收利用开展研究,从CrCl_(3)和FeCl_(3)混合溶液中分离Fe,同时回收Cr和Fe。研究了草酸沉淀法去除三价铬体系中的铁离子,并考察了草酸加入量、溶液pH、反应温度、搅拌速率对铁脱除率的影响。结果表明,当草酸加入量为理论值的1.2倍、溶液pH为3.0、反应温度为25℃时,铁脱除率可达97%以上,所得固相为二水草酸亚铁,结晶形貌好,纯度大于98%。该研究可为铁铬液流电池电解液的综合利用提供有效途径。Iron‐chromium redox flow batteries have long cycle life,high stability and low cost,and are increasingly used in the field of large‐scale electrical energy storage.The research was carried out on the recovery and utilization of failure elec‐trolyte of iron‐chromium flow battery.Fe was separated from a mixed solution of CrCl_(3) and FeCl_(3),and Cr and Fe were both re‐covered.The removal of iron ions from chromium trivalent system by oxalic acid precipitation method was studied,and the effects of oxalic acid addition amount,solution pH,reaction temperature and stirring rate on the removal rate of iron were in‐vestigated.The results showed that when the oxalic acid dosage was 1.2 times of the theoretical value,the solution pH was 3.0 and the reaction temperature was 25℃,the iron removal rate could reach more than 97%.The obtained solid phase was ferrous oxalate dihydrate with good crystal morphology and purity greater over 98%.The research could provide an effective way for the comprehensive utilization of the electrolyte of iron‐chromium redox flow batteries.

关 键 词：三氯化铬 三氯化铁 草酸 二水草酸亚铁 

分 类 号：TQ443.1[化学工程—化学肥料工业]