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-Li₂TiO₃)和正钛酸锂前驱体(Li₄Ti₅O₁₂)。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,Li₄Ti₅O₁₂较β-Li₂TiO₃活化条件苛刻,所需酸浓度更高;相同含Li⁺水体中,β-H₂TiO₃的饱和吸附容量达到32.1mg/g,而H₄Ti₅O₁₂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-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.

黄江龙(1977-),男,硕士,正高级工程师,研究方向为水处理、经济管理,huangjianglong@originwater.com;李天玉(1982-),女,博士,正高级工程师,研究方向为水处理、盐湖资源化,通讯联系人,bsy＿litianyu@126.com。