不同Li/Mn摩尔比尖晶石型锰酸锂中锂离子的酸处理抽出  

EXTRACTING Li^+ FROM SPINEL-TYPE LITHIUM MANGANESE OXIDES OF DIFFERENT Li/Mn RATIOS

作　　者：王洪玲[1] 贺红梅[1] 杜丽[1] 张燕茹[1] 马淑兰[1] 杨晓晶[1] 

机构地区：[1]北京师范大学化学学院,北京100875

出　　处：《北京师范大学学报（自然科学版）》2010年第1期49-51,共3页Journal of Beijing Normal University(Natural Science)

基　　金：国家自然科学基金资助项目(50872012)

摘　　要：采用熔融盐法合成了2种不同Li/Mn摩尔比的尖晶石型锰酸锂.在水溶液中用稀盐酸、(NH4)S2O8介质对其进行处理,旨在观察这2种化合物中的Li+离子抽出行为.结果表明对于Li+来说,2种酸溶液的抽出效果相似;Li+离子抽出表现为离子交换反应和氧化还原反应.HCl对于Mn的溶出率大,但是(NH4)2S2O8溶液几乎不溶解这2种锰酸盐.Mn的平均氧化态低的尖晶石被氧化性酸处理时,有更多的Mn3+转化成Mn4+.A flux method was used to synthesize two spinel-type manganese oxides with different Li/Mn ratios. Li^＋ was extracted by dilute HCl and （NH4）2S2O8 aqueous solutions to investigate the ion extraction behavior. Data show that for lithium ions, these two solutions lead to similar Li^＋ extraction rates, and Li^＋ extraction proceeds via both ion-exchange and redox reactions. Manganese ions are dissolved in HCl by a large dissolution rate, whereas the two manganese oxides hardly dissolved in （NH4）2S2O8 solution. The spinel with lower mean oxidation state of Mn has more change from Mn^3＋ to Mn^4＋ when treated with oxidizing acid solution.

关 键 词：尖晶石型锰酸锂 酸处理 锂离子抽出 离子交换 氧化还原反应 

分 类 号：TQ433.431[化学工程] TM911[电气工程—电力电子与电力传动]