富钛料制备H_2TiO_3型锂离子吸附剂及其吸附性能研究

Preparation of H_2TiO_3 Lithium-ion Adsorbent Using Ti-rich Material and Its Adsorption Performance Study

以熔分钛渣提纯得到的富钛料为钛源,通过固相法合成了吸附剂前躯体β-Li_2TiO_3。前躯体Li_2TiO_3经酸洗脱出Li^+后制备得到H_2TiO_3型锂离子吸附剂。考察了前躯体Li_2TiO_3的合成温度,采用吸附动力学模型和Langmuir吸附等温方程研究了吸附剂的吸附性能。结果表明:当反应温度为750℃时,得到了具有良好结晶性的前驱体β-Li_2TiO_3。在Li^+浓度为2 g/L的LiOH溶液中,该吸附剂的Li^+吸附容量为28.51 mg/g。随吸附液的碱性增强,Li^+浓度升高,吸附剂的吸附容量增大。通过Langmuir吸附等温方程计算,得出该吸附剂的理论最大吸附容量为45.6 mg/g。

β-Li2TiO3 was synthesized as precursor of the lithium-ion adsorbent via solid-phase reaction u- sing Ti-rich material as titanium source, which was prepared by purification of melt-separated titanium slag. H2TiO3 lithium-ion adsorbent was finally obtained after extracting Li＋ from the precursor Li2TiO3 via acid treatment. The synthesis temperature of precursor Li2TiO3 was investigated and the adsorption proper- ties of the adsorbent were studied using adsorption kinetics model and Langmuir adsorption isotherm equa- tion. Precursor β-Li2TiO3 with good crystallization was obtained at 750 ℃. In LiOH solution with 2 g/L of Li＋ concentration,H＋ adsorption capacity of the adsorbent reached 28.51 mg/g. Li＋ adsorption capacity increased with increase in alkalinity and Li＋ concentration of the solution. The theoretical maximum ad- sorption capacity calculated by Langmuir equation was 45.6 mg/g for the obtained adsorbent.