钛系锂离子筛的制备及其吸附性能研究

以无定型水合二氧化钛和氢氧化锂分别作为钛源和锂源,通过高温固相法合成钛系锂离子筛（HTO）并进行了扫描电镜（SEM）、X射线衍射（XRD）、接触角测试等表征。研究了HTO在高镁锂比[n（Mg）/n（Li）]盐湖卤水中随时间变化对锂吸附容量的影响。结果表明,HTO在高镁锂比盐湖卤水中26 h吸附容量达到24.8 mg/g。HTO具有优异的选择性,分离系数（α^Li _Mg）达到4 813.0。经过20次吸附循环试验,HTO的锂吸附容量仅下降4.8%,且每次钛的溶损率都在0.08%以下。结果表明,HTO具有较好的循环吸附性能和稳定性。该HTO具有从高镁锂比盐湖卤水提取锂的能力,具有很广阔的市场前景。

Research on preparation and adsorption performance of titanium lithium ion sieve

The titanium lithium ion sieve（HTO） was synthesized via high temperature solid state method by using amorphous hydrated titanium dioxide and lithium hydroxide as the titanium source and lithium source,respectively.And the scanning electron microscopy（SEM）,X-ray diffraction（XRD） and contact angle test were further carried out.The effect of HTO in salt lake brine with high n（Mg）/n（Li） over time on the lithium adsorption capacity was studied.The results showed that the adsorption capacity of HTO in salt lake brine with high n（Mg）/n（Li）reached 24.8 mg/g for 26 h.HTO had excellent selectivity with separation coefficient（α^Li _Mg） of 4 813.0.After 20 adsorption cycle tests,the lithium adsorption capacity of HTO decrea-sed by only 4.8%,and the dissolution rate of titanium was below 0.08% each time.The results showed that HTO had good cyclic adsorption performance and stability.The HTO had the ability to extract lithium from salt lake brine with high n（Mg）/n（Li）,and showed very broad market prospect.