| The gallium has widely used in various high-tech fields because of its irregular crystal structure and large internal bonding force.With the development of electronics industry in recent years,its demand will grow steadily.However gallium usually exists in combination with several minerals such as aluminum(bauxite),zinc(sphalerite)and fly ash.In this paper,the method of separating gallium from fly ash was studied,the supporting liquid membrane technology was combined with the synergetic carrier to separate gallium from different solution environment.The selectivity of target product gallium was increased,and the transmission efficiency of gallium in supporting liquid membrane was improved.Accordingly,the following studies have been carried out:Firstly,acid organophosphate carriers(D2EHPA,PC88 A,Cyanex 272),amines carriers(Aliquat336,Alamine336,N1923)and acid-base coupled carrier system were studied by solvent extraction.The effects of acidity of the aqueous phase,the concentration of the extractants on the gallium extraction percentage were investigated,respectively.The best carrier was selected in combination with the supporting liquid film system and the extraction mechanism was determined.Finally,the effect of stripping concentration on the organic phase loaded with Gallium was studied.Secondly,a single acid carrier(D2EHPA,PC88 A,Cyanex 272)or amines carrier(Aliquat336,Alamine 336)was loaded into the supporting liquid membrane and the migration process of Ga(III)in low and high acid chloride solution on the SLMs was investigated,and the mass transfer conditions were optimized to determine the masstransfer kinetics model of gallium in different environments,and then the stability of the supporting liquid membrane was evaluated.Finally,based on the above researches,the synergistic carrier was prepared and the selective separation characteristics of gallium were verified by solvent extraction method.The mass transfer performance of gallium by different coupled extractants was compared.Meanwhile,the proton migration in the process of supporting liquid membrane was studied.The optimal carrier loading to the support liquid membrane was selected to study the transmission and the selective performance of gallium by process optimization.Finally,the stability was tested by cycle. |
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