Extraction of germanium(IV) from acid leaching solution with mixtures of P204 and TBP
来源期刊：中南大学学报(英文版)2013年第7期
论文作者：MA Xi-hong(马喜红) 覃文庆 WU Xue-lan(吴雪兰)
文章页码：1978 - 1984
Key words：solvent extraction; germanium; di-(2-ethylhexlyl) phosphoric acid; tributyl phosphate; scrubbing; stripping
Abstract: Solvent extraction experiments were conducted from acidic solutions containing germanium(IV) and other metal ions, such as Ga3+, Fe3+, Zn2+ and Fe2+ in hydrometallurgical process of zinc. The purpose of this work was to enhance the efficiency of the extraction and stripping processes and the selectivity of germanium and other metals, while making the method as simple as possible. Germanium was recovered from sulfuric acid, using di-(2-ethylhexyl) phosphoric acid (P204) as an extractant, tributyl phosphate (TBP) as modifier diluted in sulfonate kerosene and stripped by NaOH aqueous solution. Extraction studies were carried out under different acid concentrations and solvent concentrations, and optimized conditions were determined. The numbers of stages required for extraction and stripping of metal ions were determined from the McCabe–Thiele plot. The results show that the extracting and stripping efficiencies are 94.3% and 100%, respectively, through two-stage extraction and two-stage strip. Moreover, the synergistic effect of TBP on the system P204/kerosense/Ge4+ is revealed with respect to the extraction of germanium.
MA Xi-hong(马喜红), QIN Wen-qing(覃文庆), WU Xue-lan(吴雪兰)
(School of Resources Processing and Bioengineering, Central South University, Changsha 410083, China)
Abstract:Solvent extraction experiments were conducted from acidic solutions containing germanium(IV) and other metal ions, such as Ga3+, Fe3+, Zn2+ and Fe2+ in hydrometallurgical process of zinc. The purpose of this work was to enhance the efficiency of the extraction and stripping processes and the selectivity of germanium and other metals, while making the method as simple as possible. Germanium was recovered from sulfuric acid, using di-(2-ethylhexyl) phosphoric acid (P204) as an extractant, tributyl phosphate (TBP) as modifier diluted in sulfonate kerosene and stripped by NaOH aqueous solution. Extraction studies were carried out under different acid concentrations and solvent concentrations, and optimized conditions were determined. The numbers of stages required for extraction and stripping of metal ions were determined from the McCabe–Thiele plot. The results show that the extracting and stripping efficiencies are 94.3% and 100%, respectively, through two-stage extraction and two-stage strip. Moreover, the synergistic effect of TBP on the system P204/kerosense/Ge4+ is revealed with respect to the extraction of germanium.
Key words:solvent extraction; germanium; di-(2-ethylhexlyl) phosphoric acid; tributyl phosphate; scrubbing; stripping
