两种基于钛酸锂型锂离子筛的性能差异研究  

Study on performance difference between two types of lithium titanate-based lithium ionic sieve

作　　者：黄江龙 赵文芳 莫恒亮 陈亦力 彭文娟 李天玉 张颖 王志栋 HUANG Jiang-long;ZHAO Wen-fang;MO Heng-liang;CHEN Yi-li;PENG Wen-juan;LI Tian-yu;ZHANG YING;WANG Zhi-dong(Beijing Origin Water Technology Co.,Ltd.,Beijing 100089,China;Beijing Hua Te Yuan Technology Co.,Ltd.,Beijing 100089,China;Beijing Origin Water Membrane Technology Co.,Ltd.,Beijing 101400,China)

机构地区：[1]北京碧水源科技股份有限公司,北京100089 [2]北京华特源科技有限公司,北京100089 [3]北京碧水源膜科技有限公司,北京101400

出　　处：《现代化工》2024年第3期140-144,共5页Modern Chemical Industry

基　　金：国家重点研发计划(2022YFC3203000)。

摘　　要：钛酸锂型锂离子筛(简称钛系锂离子筛)具有吸附容量高、选择性好、寿命长、稳定性高等特点,在盐湖提锂方面具有广阔的应用前景。以二氧化钛与氢氧化锂为原料,通过控制二者的配比和不同高温条件分别固相合成了偏钛酸锂前驱体(β-Li_(2)TiO_(3))和正钛酸锂前驱体(Li_(4)Ti_(5)O_(12))。研究了这2种锂离子筛活化过程的差异性以及在模拟盐湖卤水的吸附条件下吸附选择性和循环稳定性的差异。结果表明,Li_(4)Ti_(5)O_(12)较β-Li_(2)TiO_(3)活化条件苛刻,所需酸浓度更高;相同含Li+水体中,β-H_(2)TiO_(3)的饱和吸附容量达到32.1 mg/g,而H_(4)Ti_(5)O_(12)的饱和吸附容量仅为5.9 mg/g;2种锂离子筛在离子选择性和循环稳定性方面并无明显差异。Lithium titanium-based lithium ionic sieve has a broad prospect in lithium extraction from salt lakes because of its high adsorption capacity,good selectivity,long lifespan and high stability.In this study,lithium metatitanate(β-Li_(2)TiO_(3))and lithium titanate(Li_(4)Ti_(5)O_(12))precursors are separately synthesized from titanium dioxide and lithium hydroxide through controlling the ratio of titanium dioxide and lithium hydroxide under different high temperature conditions in solid phase.The differences in the activated process of these two kinds of lithium ionic sieve are studied,and the differences in adsorption selectivity and cycle stability under simulated salt lake brine adsorption conditions are also explored.The results indicate that Li_(4)Ti_(5)O_(12)needs harsher activating condition thanβ-Li_(2)TiO_(3),and requires higher acid concentration.In the same lithium-containing water,the saturated adsorption capacity ofβ-Li_(2)TiO_(3)reaches 32.1 mg·g^(-1),while that of Li_(4)Ti_(5)O_(12)is only 5.9 mg·g^(-1).There is no significant difference in ion selectivity and cycle stability between these two kinds of lithium ion sieves.

关 键 词：钛系锂离子筛 盐湖提锂 偏钛酸锂 正钛酸锂 

分 类 号：O69[理学—化学]