摘要
采用硫酸体系对钛酸锂废料选择性提锂、浸出液除杂沉Li2CO3、浸出渣通过固相烧结法制备TiO2。研究了硫酸浓度、液固比、反应时间等对锂浸出率的影响,锂离子浓度、碳酸钠添加量、反应温度等对Li2CO3产品质量的影响。结果表明,最佳酸浸工艺为:硫酸浓度1.5 mol/L、液固比3∶1、95℃下反应2 h,此时锂浸出率为96.80%;最佳沉锂工艺为:在净化液Li+浓度27 g/L、碳酸钠添加量为理论值的1.10倍、沉锂温度95℃、反应时间40 min,此条件下得到的碳酸锂产品主含量大于99.65%,达到行业电池级碳酸锂要求。本工艺锂浸出率高,无废液产生,工艺流程短,操作简单,成本较低,可为钛酸锂废料的综合回收提供借鉴。
A sulfuric acid system was adopted to selectively extract lithium from lithium titanate waste,and Li2CO3 was precipitated from leachate after purification.The obtained leaching residue was used to prepare TiO2 with a solid-phase sintering method.The effects of sulfuric acid concentration,liquid-solid ratio and reaction time on the leaching rate of lithium,and the effects of the lithium ion concentration,dosage of sodium carbonate and reaction temperature on the quality of Li2CO3 products were all studied.The acid leaching process was performed optimally with the sulfuric acid concentration of 1.5 mol/L,a liquid-to-solid ratio of 3∶1.After a 2 h-reaction at 95℃,the lithium leaching rate reached 96.80%;and then the following lithium precipitation process was performed optimally at 95℃for 40 min in the purification solution with Li+concentration of 27 g/L,with the dosage of sodium carbonate at an amount of 1.10 times the theoretical value,leading to the obtained lithium carbonate product with the main content more than 99.65%,up to the requirement for battery-grade lithium carbonate.It is shown that this technique,being short in processing flowsheet,simple in operation and low in cost,can bring in high lithium leaching rate without generating waste liquid.It is concluded that this research can be of reference to the comprehensive recovery of lithium titanate waste.
作者
刘雯雯
文小强
郭春平
周有池
陈燕飞
张帆
肖颖奕
LIU Wen-wen;WEN Xiao-qiang;GUO Chun-ping;ZHOU You-chi;CHEN Yan-fei;ZHANG Fan;XIAO Ying-yi(Ganzhou Institute of Nonferrous Metallurgy,Ganzhou 341000,Jiangxi,China)
出处
《矿冶工程》
CAS
CSCD
北大核心
2020年第4期95-98,102,共5页
Mining and Metallurgical Engineering
基金
江西省重点研发计划项目(20192BBE50022)
赣州市科技计划项目(赣市科发[2018]50号)
江钨集团公司项目(JXTC-19A-05)。
关键词
废旧锂电池
综合回收
钛酸锂
锂
电池级
碳酸锂
spent lithium batteries
comprehensive recycling
lithium titanate
lithium
battery grade
lithium carbonate
作者简介
刘雯雯(1989-),女,江西赣州人,工程师,硕士,主要研究方向为新能源、二次资源回收利用。
