【摘要】 中国的锂资源主要赋存于高镁锂比盐湖卤水中，提锂难度较高，单一分离手段难以高效提锂，多种盐湖提锂技术的耦合是盐湖提锂的未来发展趋势。采用吸附—膜耦合法对盐湖卤水进行处理，在优化条件下实现了高选择性锂吸附，动态脱附后卤水镁锂比从105.2降低至1.49。考察了不同条件对纳滤膜分离纯化锂的影响。纳滤膜在稀释倍数1.0、温度20℃、操作压力0.4 MPa、pH 4.66、产水原料液比0.54的条件下，锂截留率为2.63%、分离因子为27.3、渗透通量为7.125 L/(m~2·h),最终产水镁锂比从最初的105.2降低至0.05,实现了对高镁锂比盐湖卤水中锂资源的绿色高效提取。更多还原

【Abstract】 China′s lithium resources mainly exist in salt lake with high magnesium-lithium ratio, which is difficult to extract lithium efficiently by a single separation method.The coupling of multiple lithium extraction technologies from salt lakes is the future development trend of lithium extraction from salt lakes.The salt lake brine was treated by adsorption-membrane coupling method, and the highly selective lithium adsorption was realized under optimized conditions, and the Mg²⁺/Li⁺ ratio of the brine was reduced from 105.2 to 1.49 after dynamic desorption.The effect of different conditions on the separation and purification of lithium by nanofiltration membrane separation was investigated.Under the conditions of dilution ratio of 1.0,temperature of 20 ℃,operating pressure of 0.4 MPa, pH value of 4.66,and raw material/liquid ratio of the produced water of 0.54,the lithium retention rate of nanofiltration membrane is 2.63%,the separation factor is 27.3,and the permeation flux is 7.125 L/（m²·h）.The final Mg²⁺/Li⁺ ratio of the produced water is reduced from the initial brine of 105.2 to 0.05,which the green and efficient extraction of lithium resources from salt lake brines with high Mg²⁺/Li⁺ ratio is realized.更多还原