摘要
采用NT102纳滤膜对高镁锂比卤水镁锂分离性能做了研究,考察了操作压力、进料温度、pH、原料液镁锂比、稀释倍数等操作条件以及Na~+、K~+、H_3BO_3、SO_4~(2-)对镁锂分离性能的影响。结果表明:采用较低的操作压力、进料温度、pH、稀释倍数以及较高的原料液镁锂比(质量比,下同),有利于实现镁锂分离;同时,溶液中的Na~+、K~+、H_3BO_3对提高镁锂分离性能有利,而SO_4~(2-)则对镁锂分离产生不利影响;NT201纳滤膜对高镁锂比卤水的镁锂分离因子可达0.038 5,分离性能优异。
The separation experiments of magnesium and lithium from brine with high ratio of magnesium to lithium were carried out by NT102 nanofiltration membranes.The effects of operating pressure,feeding temperature,pH,Mg~(2+)/Li~+ratio and dilution multiple on separation performance were investigated.Moreover,the influences of Na~+,K~+,H_3 BO_3 and SO_4~(2-)on the Mg~(2+)and Li~+separation were also studied.It was found that the lower operating pressure,feeding temperature,pH and dilution multiple,and higher Mg~(2+)/Li~+ratio were advantageous to improve the separation performance between Mg~(2+)and Li~+.Furthermore,the presence of Na~+,K~+and H_3 BO_3 in brine could enhance the separation of Mg~(2+)and Li~+,while the influence of SO_4~(2-)was opposite.The NT201 nanofiltration membrane had excellent separation performance for the brine with high ratio of magnesium to lithium with lower separation factor of 0.038 5.
引文
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