膜科学与技术

盐湖提锂用退役纳滤膜的污染分析

作者：王金燕，王曼曼，李鸽，王晶，姚之侃，寇瑞强，周志军，张林

单位： 1. 浙江大学化学工程与生物工程学院，膜与水处理教育部工程中心，杭州 310027； 2.山西浙大新材料与化工研究院，太原 030000 3. 青海启迪清源新材料有限公司，格尔木，816000

关键词：锂镁分离；纳滤膜；膜污染

出版年,卷(期):页码： 2023,43(5):83-88

摘要：

纳滤分离技术已在盐湖提锂领域得到了成功的应用。但在锂镁分离运行过程中，纳滤膜不可避免地会发生膜污染，导致膜性能显著下降，膜服役寿命大幅缩短。为此，本文对退役的青海察尔汗盐湖提锂用纳滤膜进行了剖检，表征并分析了纳滤膜表面污染层的形貌结构及其化学组成。结果表明，膜表面以胶状无机污染为主，其中以SiO2胶体污染最为严重，污染层中的主要无机成分还包括Fe2O3与Al2SiO5等，而主要的有机成分则包含蛋白质与多糖。基于对纳滤膜的污染分析，本文进一步提出了盐湖提锂过程中纳滤膜污染的预防措施，为纳滤膜的有效运行提供参考。

Nanofiltration separation technology has been successfully applied in the field of lithium extraction from the salt-lake. However, during the separation process, membrane fouling occurs inevitably, resulting in decreased membrane performance and shortened membrane lifetime. In this work, the deteriorated nanofiltration membrane applied for the lithium extraction from Qinghai Qarhan Salt Lake was autopsied. The morphologies and compositions of the membrane fouling layer were evaluated. The results showed that the membrane mainly suffered from the inorganic colloidal. SiO2 colloids were the mostly detected foulants. Fe2O3, and Al2SiO5 were the other detected inorganic foulants with high content. The main organic foulants were proteins and polysaccharides. Based on the above results, strategies to extent the lifetime of nanofiltration membranes in lithium extraction from salt-lake process were proposed.

王金燕（1998-），女，浙江杭州人，硕士研究生，研究方向为反渗透膜污染研究

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