Inorganic Chemicals Industry ›› 2024, Vol. 56 ›› Issue (6): 55-60.doi: 10.19964/j.issn.1006-4990.2023-0285

• Research & Development • Previous Articles     Next Articles

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

XUE Jin1(), TIAN Mengkui1(), LIU Hai2   

  1. 1.School of Chemistry and Chemical Engineering,Guizhou University,Guiyang 550025,China
    2.State Key Laboratory for Efficient Utilization of Medium and Low Grade Phosphate Ore and Associated Resources,Guiyang 550016,China
  • Received:2023-05-25 Online:2024-06-10 Published:2024-06-20
  • Contact: TIAN Mengkui E-mail:1148145312@qq.com;tianmk78@ 126.com

Abstract:

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.

Key words: phosphorus concentrate, ceramic membrane, membrane pollution, xDLVO, interaction energy

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