xDLVO理论解析磷精矿陶瓷过滤过程中膜污染问题的研究  

Study on membrane fouling in ceramic filtration of phosphorus concentrate based on xDLVO theory

作　　者：薛锦 田蒙奎[1] 刘海 XUE Jin;TIAN Mengkui;LIU Hai(School of Chemistry and Chemical Engineering,Guizhou University,Guiyang 550025,China;State Key Laboratory for Efficient Utilization of Medium and Low Grade Phosphate Ore and Associated Resources,Guiyang 550016,China)

机构地区：[1]贵州大学化学与化工学院,贵州贵阳550025 [2]中低品位磷矿及其伴生资源高效利用国家重点实验室,贵州贵阳550016

出　　处：《无机盐工业》2024年第6期55-60,93,共7页Inorganic Chemicals Industry

基　　金：国家自然科学基金项目(22162007);贵州省科技计划项目(黔科合支撑[2021]480,[2023]379);瓮福(集团)有限责任公司技术开发项目[WH-220787(YF)]。

摘　　要：应用xDLVO(Extend Derjaguin-Landau-Verwey-Overbeek)理论解析了氧化铝陶瓷膜在磷精矿过滤过程中的膜污染行为。通过xDLVO理论,计算了原生膜(N-AM)、清洗再生膜(C-AM)和淘汰膜(F-AM)与污染物(MP,氟磷灰石、白云石、二氧化硅混合物)之间的相互作用能,分析了范德华作用能(LW)、静电作用能(EL)、极性作用能(AB)在膜污染过程中的贡献。结果表明:对于N-AM膜AB占主导地位表现为排斥作用,有利于减缓膜污染;而对于C-AM膜和F-AM膜LW作用能为主要作用能,表现为吸引作用,加剧膜污染。在膜污染过程中,范德华作用能差异较小,而静电作用能绝对值极小,贡献微弱。膜污染实验与计算结果较一致,表明xDLVO理论对于磷精矿在膜分离过程中的膜污染行为解析及膜污染控制具有指导意义。The membrane fouling behavior of alumina ceramic membrane in the process of phosphorus concentrate filtration was analyzed using xDLVO(Extend Derjaguin Landau Verweek Overbeek) theory.Based on xDLVO theory,the interaction energy between primary membrane(N-AM),cleaning regeneration membrane(C-AM) and phase out membrane(F-AM) and pollutants(MP)(mixture of fluorapatite,dolomite and silica) was calculated.The contribution of Van der Waals interaction energy(LW),electrostatic interaction energy(EL) and polar interaction energy(AB) in the process of membrane pollution was analyzed.The results indicated that AB dominated the N-AM membrane,exhibiting a repulsive effect,which was beneficial for alleviating membrane fouling;for C-AM and F-AM membranes,the LW interaction energy was the main interaction energy,manifested as attraction,exacerbating membrane fouling.In all pollution processes,the difference in Van der Waals interaction energy was relatively small,while the absolute value of electrostatic interaction energy was extremely small and its contribution was weak.The membrane fouling experiment and calculation results were consistent,indicating that the xDLVO theory had guiding significance for the analysis of membrane fouling behavior and membrane fouling control in the membrane separation process of phosphorus concentrate.

关 键 词：磷精矿 陶瓷膜 膜污染 xDLVO 相互作用能 

分 类 号：TQ126.3[化学工程—无机化工]