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Fouling characteristics of retired nanofiltration membranes for lithium extraction from salt-lake brines

Authors： WANG Jinyan, WANG Manman, LI Ge, WANG Jing, YAO Zhikan, KOU Ruiqiang, ZHOU Zhijun, ZHANG Lin

Units： 1. MOE Engineering Research Center of Membrane and Water Treatment Technology, College of Chemical & Biological Engineering, Zhejiang University, Hangzhou, 310027, China 2. Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering, Taiyuan, 030000, China 3. Qinghai Qidian Qingyuan New Materials Co., Ltd, Golmud, 816000

KeyWords： separation of Li+ and Mg2+ ; nanofiltration membrane; membrane fouling

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2023,43(5):83-88

Abstract：

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.

Funds：

浙江省“领雁”计划项目（2022C03048），山西浙大新材料与化工研究院研发项目（2022SZ-TD002），国家自然科学基金（U21A20302，22108247），国家重点研发计划项目（2020YFC1909400）

AuthorIntro：

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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