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作 者:祝宏帅 袁中直 曾文强 李亚德 刘金成 ZHU Hong-shuai;YUAN Zhong-zhi;ZENG Wen-qiang;LI Ya-de;LIU Jin-cheng(EVE Energy Co.,Ltd.,Huizhou Guangdong 516000,China)
机构地区:[1]惠州亿纬锂能股份有限公司,广东惠州516000
出 处:《电源技术》2020年第5期653-656,672,共5页Chinese Journal of Power Sources
摘 要:针对废锂离子电池正极材料浸出方法试剂消耗量大的问题,利用废钴酸锂、磷酸铁锂正极材料在酸性条件下发生的氧化还原反应联合浸出钴、锂,从而大幅减少双氧水试剂的消耗。通过条件实验得到了优化的钴酸锂、磷酸铁锂联合浸出方案:反应温度为60℃,按铁钴摩尔比(Fe/Co)1.1∶1进行混料,硫酸、双氧水用量分别为反应当量1.05和1.1倍。反应完成后,钴、锂的浸出率分别为96.21%、96.65%,浸出液中钴、锂的浓度分别为64.41、17.23 g/L,铁、磷杂质含量降至0.02 g/L以内;通过成分分析结果可知,浸出渣主要成分为FePO4·2 H2O与碳粉的混合物,其中钴、锂的残留量降至0.2%(质量分数)以内。采用磷酸铁锂与钴酸锂进行联合浸出的方案与采用双氧水分别浸出两种材料的方案相比,每处理1 t混合料可节约815 kg双氧水(分析纯,质量分数30%),且可将钴、锂浸出率提升3%~5%。Aiming at the problem of high consumption of reagents in the leaching process of positive materials for waste lithium ion batteries,the redox reaction between lithium cobalt oxide and lithium iron phosphate under acidic conditions were used to leach cobalt and lithium jointly,consequently,the consumption of hydrogen peroxide reagent was greatly reduced.The optimum combined leaching process is obtained by condition experiments:the reaction temperature is 60℃,the mole ratio of iron to cobalt(Fe/Co)in the mixed materials is 1.1∶1,the dosage of sulfuric acid and hydrogen peroxide is 1.05 and 1.1 times of reaction equivalent respectively.After completing the reaction,the leaching ratio of cobalt and lithium are 96.21%and 96.65%,respectively,the concentration of cobalt and lithium in leaching solution is 64.41 and 17.23 g/L respectively,while the content of iron and phosphorus impurities decreased to less than 0.02 g/L.The results of component analysis show that the main component of leaching residue is the mixture of FePO4·2 H2O and carbon powder,cobalt and lithium in the leaching residue are reduced to less than 0.2%.The scheme of combined leaching process of waste lithium cobaltate and lithium iron phosphate battery cathode materials can save 815 kg of hydrogen peroxide(AR,30%)per ton of mixed materials,and the leaching ratio of cobalt and lithium can increase by 3%~5%comparing with the scheme of using hydrogen peroxide to leach the two materials separately.
分 类 号:TM912[电气工程—电力电子与电力传动]
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