膜科学与技术

高压纳滤膜在浓盐水资源化利用中的应用研究

作者：张兆钢，梁松苗，田长周，胡利杰

单位：时代沃顿科技有限公司，贵阳 550014

关键词：高压纳滤膜组合浓缩浓水资源化梯级分离

出版年,卷(期):页码： 2021,41(6):146-152

摘要：

纯碱生产厂双膜法精制卤水的工艺中，纳滤系统的浓水富含MgSO4、MgCl2及NaCl。用耐压等级为8.5MPa，不同MgCl2截留率的纳滤膜对常压纳滤系统的浓水进行浓缩实验，探究纳滤浓水资源化利用的可行性。结果表明：前三段选择截留率为96.3%、后两段选择截留率为45.5%的纳滤膜的组合浓缩方案是较优工艺。大部分NaCl、MgCl2分别渗透到前三段、后两段产水中，MgSO4保留在浓水中，MgCl2、MgSO4的浓度分别可达48.61g/L、205.64g/L。NaCl、MgCl2及MgSO4的可回用率分别为76.43%、62.59%及61.29%，初步实现了有价元素梯级分离。在用截留率为96.3%的纳滤膜元件进行单独浓缩的工艺中，MgCl2及MgSO4保留在浓水中，浓缩倍数分别为6.29及6.73；产水是较纯净的NaCl溶液，浓度为20.21g/L。组合浓缩工艺后两段产水侧含有较高浓度的MgCl2，使纳滤膜两侧溶液的渗透压差降低，利于MgSO4进一步浓缩。可见，不同性能的纳滤膜的组合工艺具有一定的应用前景。

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.

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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