Extraction of Lithium from Salt Lake Brine by H2 TiO3 Lithium Ion Sieves
The adsorption-resolution process of H2TiO3 lithium sieves for lithium extraction from salt lake brine was investigated.The crystal shape and morphology of the screen before and after adsorption were characterized by X-ray diffraction(XRD)and scanning electron microscopy(SEM).The results show that the surface of H2 TiO3 lithium ion screen has good particle dispersion,loose pores and stable crystal structure after granulation,and the structure does not change significantly after recycling.In the continuous ion exchange system,the 30 columns are divided into 6∶1∶2∶1 according to the four steps of adsorption-washing material-desorption-acid washing,under the optimal conditions of the adsorption feed flow rate of 12 BV/h,the adsorption time of 3 h,the washing flow rate of 1 BV/h,the rinsing time of 30 min,the hydrochloric acid in the analytical process of 0.1 mol/L,analytical temperature of 30～40 ℃,the cyclic analytical time of 1 h,the acid washing flow rate of 8 BV/h,the washing rate of 30 min,the continuous operation of 30 cycles,the adsorption performance is stable,the adsorption capacity is about 6.67 mg/g,the adsorption rate is about 80％,and the Li-rich analytical liquid Li+mass concentration is about 1.2 g/L,ρ(Li+)/ρ(Na+)is about 1.The method has a certain value of industrial popularization and application.
H2 TiO3lithium ion sievesadsorption methodlithium extraction from salt lake
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