This paper investigated the effect of important factors on SLMSD performance to recover indium from etching solution such as: pH of feed solution, extractant (Di-(2-ethylhexyl) phosphoric acid (D2EHPA)) concentration, oxalic acid concentration. It was found that % In3+ was removed from feed solution in about 20 minutes with high concentration factor () under suitable conditions (pH 1; Di-(2- ethylhexyl) phosphoric acid (D2EHPA), 2 wt% oxalic acid). | Vietnam Journal of Science and Technology 59 1 2021 90-95 doi 2525-2518 59 1 15569 SUPPORTED LIQUID MEMBRANE WITH STRIP DISPERSION FOR RECOVERING INDIUM FROM ETCHING SOLUTION OF LCD INDUSTRY INFLUENCE OF FACTORS ON PERFORMANCE Dang Thi Tuyet Ngan1 2 Tran Trung Kien1 Da-Ming Wang2 1 School of Chemical Engineering Hanoi University of Science and Technology HUST Dai Co Viet Ha Noi Viet Nam 2 National Taiwan University NTU Sec. 4 Roosevelt Road Taipei 10617 Taiwan Emails Received 8 October 2020 Accepted for publication 8 January 2021 Abstract. Supported liquid membrane with strip dispersion SLMSD is a promising process for metal recovery from e-waste or waste streams because of many advantages such as the ability to combine extraction and stripping into one single step and thus have non-equilibrium mass transfer characteristics and maximum driving force. This paper investigated the effect of important factors on SLMSD performance to recover indium from etching solution such as pH of feed solution extractant Di- 2-ethylhexyl phosphoric acid D2EHPA concentration oxalic acid concentration. It was found that In3 was removed from feed solution in about 20 minutes with high concentration factor under suitable conditions pH 1 Di- 2- ethylhexyl phosphoric acid D2EHPA 2 wt oxalic acid . Keywords liquid membrane SLMSD indium recovery etching solution D2EHPA. Classification numbers . 1. INTRODUCTION Using liquid membrane the extraction and stripping process can be combined into one step that normally carried out in two separate stages in conventional solvent extraction. This technique has been applied mainly for ions separating and concentrating. The membrane here is an organic solution which consists of an extractant a diluent and a modifier in some cases. The desired ion forms complex with extractant at one side of membrane then the complex diffuses across the membrane to the opposite side where the .
