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-Li2TiO3)and lithium titanate(Li4Ti5O12)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 Li4Ti5O12 needs harsher activating condition than β-Li2TiO3,and requires higher acid concentration.In the same lithium-containing water,the saturated adsorption capacity of β-Li2TiO3 reaches 32.1 mg·g-1,while that of Li4Ti5O12 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
Key words
titanium-based lithium ionic sieve/lithium extraction from salt lake/lithium titanate/lithium metatitanate
维普
万方数据