盐湖卤水系统的纳滤膜结垢分析与清洗方案优化的研究  

Study on Scaling Analysis and Cleaning Optimization of Nanofiltration System for Salt-lake Brine

作　　者：程新[1,2] 莫晓媛 谭惠芬 康晓晖 CHENG Xin;MO Xiaoyuan;TAN Huifen;KANG Xiaohui(Hangzhou Water Treatment Technology Development Center Co.,Ltd,310012;Bluestar(Hangzhou)Membrane Industries Co.,Ltd,Hangzhou 311106,China)

机构地区：[1]杭州水处理技术研究开发中心有限公司,310012 [2]蓝星(杭州)膜工业有限公司,浙江杭州311106

出　　处：《水处理技术》2023年第10期108-112,共5页Technology of Water Treatment

基　　金：国家重点研发计划资助项目(2021YFB3801104);国家重点研发计划资助项目(2021YFB3801102);浙江省重点实验室(2012E10001)。

摘　　要：纳滤用于盐湖提锂体系可大幅降低后续卤水中的镁锂比从而提高提锂工艺效率。通过解剖某盐湖卤水系统中在线清洗无法恢复性能的三款不同厂家不同型号的纳滤膜发现,造成膜污染的主要成分均为碳酸镁结垢。通过系统分析碳酸镁为主的复杂结垢产物的形成机理以及纳滤膜结垢的影响因素,在现有预处理方案和常规纳滤膜系统设计的前提下,针对性地提出物理清洗和化学清洗结合的优化方案。采用多频次、反向冲洗,同时小流量溶解松动、大流量冲刷去除、中流量加压深度去除的方案,可针对性解决高盐复杂盐卤水体系的纳滤膜碳酸镁垢风险。The application of Nanofiltration(NF)in salt-lake lithium extraction systems can significantly reduce the magnesium-lithium ratio in the subsequent brine,thereby enhancing the efficiency of the extraction process.By analyzing three NF membranes from different manufacturers,it was discovered that the main cause of membrane pollution was magnesium carbonate scaling.Through a systematic analysis of the formation mechanism of complex scale involving magnesium carbonate and the factors influencing NF membrane fouling,an optimization scheme was developed.This scheme combines physical and chemical cleaning methods while maintaining the existing pretreatment scheme and conventional NF membrane system design.To address the risk of magnesium carbonate scale in high salt complex brine water systems,a multi-frequency approach,reverse washing,low flow dissolution loosening,high flow scouring removal,and medium flow pressure deep removal can be employed.

关 键 词：盐湖提锂 纳滤 碳酸镁 结垢 清洗 

分 类 号：TQ028.8[化学工程]