高镁锂比卤水的纳滤膜分离性能研究
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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.
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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[18] Tu K L,Nghiem L D,Chivas A R.Boron removal by reverse osmosis membranes in seawater de salination applications[J].Separation and Purification Technology,2010,75(2):87-101.
[2] Garrett D E.Handbook of lithium and natural calcium chloride[M].Oxford:Academic Press,2004:180.
[3] Camille Grosjean,Pamela Herrera Miranda,Marion Perrin,et al.Assessment of world lithium resources and consequences of their geographic distribution on the expected development of the electric vehicle industry[J].Renewable and Sustainable Energy Reviews,2012,16(3):1735-1744.
[4]冯跃华.中国盐湖卤水提锂工程化现状及存在问题[J].武汉工程大学学报,2013,35(5):9-14.
[5]张秀峰,谭秀民,张利珍.纳滤膜分离技术应用于盐湖卤水提锂的研究进展[J].无机盐工业,2017,49(1):1-5.
[6]王晓琳,丁宁.反渗透和纳滤技术与应用[M].北京:化学工业出版社,2006:28-30.
[7] Raman L P,Cheryan M,Rajagopalan N.Consider nanofiltration for membrane separation[J].Chemical Engineering Progress,1994,3:68-74.
[8]计超,张杰,张志君,等.DK纳滤膜对高镁锂比卤水的分离性能研究[J].膜科学与技术,2014,34(3):79-85.
[9] Li X H,Zhang C J,Zhang S N,et al.Preparation and characterization of positively charged polyamide composite nanofiltration hollow fiber membrane for lithium and magnesium separation[J].Desalination,2015,369:26-36.
[10] Sun S Y,Cai L J,Nie X Y,et al.Separation of magnesium and lithium from brine using a Desal nanofiltration membrane[J].Journal of Water Process Engineering,2015(7):210-217.
[11] Bi Q Y,Zhang Z Q,Zhao C Y,et al.Study on the recovery of lithium from high Mg2+/Li+ratio brine by nanofiltration[J].Water Science and Technology,2014,70(10):1690-1694.
[12] Yang Gang,Shi Hong,Liu Wenqiang,et al.Investigation of Mg2+/Li+separation by nanofiltration[J].Chinese Journal of Chemical Engineering,2011,19(4):586-591.
[13] Mohammad A W,Teow Y H,Ang W L,et al.Nanofiltration membranes review:Recent advances and future prospects[J].Desalination,2015,356:226-254.
[14] Sun Yongli,Sun Minhua,Cheng Weidong,et al.The examination of water potentials by simulating viscosity[J].Computational Materials Science,2007,38(4):737-740.
[15] M覿ntt覿ri M,Pihlajam覿ki A,Nystr觟m M. Effect of pH on hydrophilicity and charge and their effect on the filtration efficiency of NF membranes at different pH[J].Journal of Membrane Science,2006,280(1/2):311-320.
[16]温现明.荷电膜在盐湖卤水中的传递性质研究[D].西宁:中国科学院研究生院,2006.
[17] Volkov A G,Paula S,Deamer D W.Two mechanisms of permeation of small neutral molecules and hydrated ions across phospholipid bilayers[J].Bioelectrochemistry and Bioenergetics,1997,42(2):153-160.
[18] Tu K L,Nghiem L D,Chivas A R.Boron removal by reverse osmosis membranes in seawater de salination applications[J].Separation and Purification Technology,2010,75(2):87-101.