废旧磷酸铁锂正极粉脱锂后的磷铁渣经硝酸浸出除铝的研究  

Study on Removal of Aluminum from Ferrous Phosphate Slag after Lithium Removal from Waste Lithium Iron Phosphate Cathode Powder by Nitric Acid Leaching

作　　者：黄铿齐 李立平 肖炜彬 谭泽 HUANG Kengqi;LI Liping;XIAO Weibin;TANG Ze(Guangdong Guanghua Sci-tech Co.,Ltd.,Shantou 515000,China)

机构地区：[1]广东光华科技股份有限公司,广东汕头515000

出　　处：《化工技术与开发》2023年第4期66-70,共5页Technology & Development of Chemical Industry

基　　金：广东省重点领域研发计划项目(2020B090919003)。

摘　　要：针对废旧磷酸铁锂正极粉脱锂后的磷铁渣含铝量偏高的问题,开展了无机酸体系浸出磷铁渣除铝的研究,重点考察了酸种类、酸浓度、液固比、浸出温度、浸出时间等参数对Fe、Al浸出规律的影响。结果表明,Fe、Al在硝酸中的浸出率差异,大于在硫酸或磷酸中的浸出率差异。在硝酸体系中,当酸浓度为0.2mol·L^(-1)、液固比为10∶1、浸出温度为70℃、浸出时间为8.0h时,Al、Fe的浸出率分别为96.3%和3.92%。硝酸酸浸法可扩大磷酸铁与铝的浸出率差异,实现铝的选择性溶出,达到深度除铝的目的。In view of the problem that the aluminum content of iron phosphate slag after the lithium removal of waste lithium iron phosphate cathode powder was relatively high,the research on the aluminum removal of iron phosphate slag by the leaching of inorganic acid system was carried out,focused on the effects of acid type,acid concentration,liquid-solid ratio,leaching temperature,leaching time on the leaching law of Fe and Al.The results indicated that the leaching difference between Fe and Al in nitric acid was greater than that of sulfuric acid or phosphoric acid.In nitric acid system,when the concentration of nitric acid was 0.2mol/L,liquidto-solid ratio was 10:1,leaching temperature was 70℃and reaction time was 8.0h,leaching efficiency of Al and Fe were 96.3%and 3.92%,respectively.The nitric acid leaching method could expand the leaching difference between iron phosphate and aluminum,realize the selective dissolution of aluminum,and achieve the purpose of deep aluminum removal.

关 键 词：废旧磷酸铁锂正极粉 磷铁渣 硝酸 浸出率差异 除铝 

分 类 号：X705[环境科学与工程—环境工程]