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Application of Ultra high pressure nanofiltration membrane in resource utilization of concentrated brine

Authors： ZHANG Zhaogang, LIANG Songmiao, TIAN Zhangzhou, HU Lijie

Units： Vontron Technology Co.，Ltd Guiyang 550014

KeyWords： Ultra high pressure nanofiltration membrane combined concentration concentrated briner reclamation gradient separation

ClassificationCode：TQ09

year,volume(issue):pagination： 2021,41(6):146-152

Abstract：

In the process of refining brine by double membrane method in soda production plant, the concentrate of nanofiltration system is rich in MgSO4, MgCl2 and NaCl. The concentration experiments were carried out by different MgCl2 rejection nanofiltration membranes that their maximum operating pressure is 8.5 MPa to explore the feasibility of resource utilization for concentrate in nanofiltration system. The experimental result shows that：the combined concentration schemed nanofiltration membrane whose rejection was 96.3% in first to third stages and rejection was 45. 5% in the second two stages was preferred。NaCl and MgCl2 were mainly permeated with water in the first to third stages and second two stages respectively, while MgSO4 were remained in concentrate, the concentration of MgCl2 and MgSO4 were 48.61g/l and 205.64g/l respectively. The reuse rates of NaCl, MgCl2 and MgSO4 were 76.43%, 62.59% and 61.29% respectively and achieved the gradient separation of Valuable elements. For single concentration process by nanofiltration membrane whose rejection was 96.3%, both MgCl2 and MgSO4 were remained in concentrate, the concentration multiples were 6.29 and 6.73 respectively; the permeate was NaCl solution with a concentration of 20.21g/l. For combined concentration process, the permeate contained high concentration of magnesium chloride, reduced the osmotic pressure difference across the membrane, and benefited to the further concentration of magnesium sulfate. It can be forecasted that the combination process of nanofiltration membrane with different performance has a certain application prospect.

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AuthorIntro：

张兆钢（1988-），男，贵州晴隆人，本科，工程师，主要从事反渗透、纳滤膜的应用研究.

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