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报道一种制备Li_2TiO_3的新方法—无机沉淀胶溶法。以硫酸氧钛为钛源、乙酸锂为锂源、过氧化氢为络合剂,经沉淀-胶溶制备钛-锂溶胶体系,再经干燥、煅烧、酸洗制备偏钛酸型锂吸附剂。采用FTIR、TG-DSC、XRD、SEM、ICP、Zetasizer Nano及旋转式黏度计等测试、表征手段,考察了各制备条件对溶胶体系稳定性、干凝胶及Li_2TiO_3显微结构特性及性能的影响。结果表明:乙酸锂为锂源,体系pH值为7,Ti~(4+)浓度为0.2 mol/L,经陈化24h,可得到黏度为7.3 m Pa·s,Zeta电位为-29.5 m V的稳定溶胶体系。红外光谱分析表明干凝胶中含过氧键;干凝胶较佳煅烧温度和煅烧时间分别为750℃、2 h,制备得到β-Li_2TiO_3,;将β-Li_2TiO_3用0.2 mol/L盐酸溶液进行酸洗制备得到偏钛酸型锂吸附剂H_2TiO_3,锂的酸洗率为85.31%,锂的再吸附容量为27.15 mg/g。
A new method of preparing Li_2TiO_3 was reported - inorganic precipitation peptization. Titanium titanate as a titanium source, lithium acetate as a lithium source and hydrogen peroxide as a complexing agent, preparing a titanium-lithium sol system through precipitation-peptizing, and then drying, calcining and pickling to prepare a metatitanic lithium adsorbent . The effects of preparation conditions on the stability of sol system, microstructure and properties of xerogel and Li_2TiO_3 were investigated by means of FTIR, TG-DSC, XRD, SEM, ICP, Zetasizer Nano and rotary viscometer. . The results show that lithium acetate is a lithium source with a pH of 7 and a Ti (4+) concentration of 0.2 mol / L. After aging for 24 h, the viscosity is 7.3 mPa · s and the Zeta potential is -29.5 mV Stable sol system. Infrared spectrum analysis showed that the xerogels contained xerogels in the xerogel. The optimum calcination temperature and calcination time of the xerogel were 750 ℃ and 2 h, respectively. The β-Li_2TiO_3 was prepared with 0.2 mol / L hydrochloric acid Pickling prepared titanate type lithium adsorbent H_2TiO_3, lithium pickling rate of 85.31%, lithium re-adsorption capacity of 27.15 mg / g.