锂离子筛前驱体Li_(1.6)Mn_(1.6)O_4的制备及酸洗研究  

Preparation and acid-pickling of Li_(1.6)Mn_(1.6)O_4 lithium-ion sieve precursor

作　　者：吉国佳 朱桂茹[1] 

机构地区：[1]中国海洋大学化学化工学院,山东青岛266100

出　　处：《无机盐工业》2015年第12期38-42,共5页Inorganic Chemicals Industry

摘　　要：以高锰酸钾、无水乙醇、氢氧化锂等为原料,采用水热法制备了锂离子筛。考察了锂离子筛前驱体在不同条件下酸洗其锂离子洗脱率和锰离子溶损率,得出最优酸洗条件。研究表明,在酸洗温度为30℃、搅拌转速为400 r/min、酸洗时间为12 h、盐酸浓度为0.1 mol/L、液固比为500 m L/g条件下对锂离子筛前驱体进行酸洗,锂离子溶出率达到98%以上、锰离子溶损率小于3%。经X射线衍射(XRD)和扫描电镜(SEM)检测,锂离子筛前驱体和酸洗后锂离子筛都呈尖晶石结构。锂离子筛在p H=12.6、质量浓度为500 mg/L的锂原液中对锂的吸附量达到62.20 mg/g。Lithium ionic-sieve precursor was prepared by hydrothermal synthesis method with KMO4,Et OH,and Li OH·H2O as raw materials.Lithium extraction rate and manganese dissolving loss rate of lithium ion-sieve precursor under different conditions were investigated to determine the optimal conditions of acid pickling.The optimal conditions were that the experimental temperature was 30 ℃,the stirring speed was 400 r/min,pickling time was 12 h,concentration of HCl was 0.1 mol/L,and the liquid-solid ratio was 500 m L/g.Lithium extraction rate could reach over 98% and manganese dissolving loss rate was less than 3% under the optimal conditions.The precursor and the acid-pickled lithium ion-sieve both presented spinel structure through XRD and SEM test.Its adsorption capacity to lithium reached 62.20 mg/g,in the lithium primary liquid with mass concentration of 500 mg/L and with p H of 12.6.

关 键 词：锂离子筛 锂溶出率 锰溶损率 

分 类 号：TQ131.11[化学工程—无机化工]