Zn,Pb,Ga and Ge were separated and recovered from zinc refinery residues by stepwise leaching.In the first stage,by leaching with H2SO4 media,more than 90%of Zn and 99%of Ga were dissolved,leaving 92%of Ge in the leac...Zn,Pb,Ga and Ge were separated and recovered from zinc refinery residues by stepwise leaching.In the first stage,by leaching with H2SO4 media,more than 90%of Zn and 99%of Ga were dissolved,leaving 92%of Ge in the leaching residue.In the second stage,by leaching with HCl media,approximately 99%of Pb and less than 2%of Ge were selectively dissolved.Finally,the remaining 90%of Ge was extracted in 1 mol/L NaOH solution by destroying the correlation between SiO2 and Ge.XRD pattern of the leaching residue demonstrated that ZnSO4·H2O,PbSO4 and SiO2 were removed sequentially through the stepwise leaching.The proposed process achieved high recoveries of Zn,Pb,Ga and Ge,thus presenting a potential industrial application.展开更多
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 wor...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 （P2O4） 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 P2O4/kerosense/Ge4＋ is revealed with respect to the extraction of germanium.展开更多
基金The authors are grateful for the financial supports from the National Natural Science Foundation of China(51804083,51704081)the National Key Research and Development Project(2018YFC1903104)+2 种基金the Natural Science Foundation of Guangdong Province,China(2019A1515011628)the Science and Technology Planning Project of Guangzhou(201904010106)of ChinaGuangdong Academy of Science Doctor Special Program of China(2020GDASYL-0104027,2019GDASYL-0105079,2019GDASYL-0302011,2019GDASYL-0402003).
文摘Zn,Pb,Ga and Ge were separated and recovered from zinc refinery residues by stepwise leaching.In the first stage,by leaching with H2SO4 media,more than 90%of Zn and 99%of Ga were dissolved,leaving 92%of Ge in the leaching residue.In the second stage,by leaching with HCl media,approximately 99%of Pb and less than 2%of Ge were selectively dissolved.Finally,the remaining 90%of Ge was extracted in 1 mol/L NaOH solution by destroying the correlation between SiO2 and Ge.XRD pattern of the leaching residue demonstrated that ZnSO4·H2O,PbSO4 and SiO2 were removed sequentially through the stepwise leaching.The proposed process achieved high recoveries of Zn,Pb,Ga and Ge,thus presenting a potential industrial application.
基金Project(50774094)supported by the National Natural Science Foundation of China
文摘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 （P2O4） 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 P2O4/kerosense/Ge4＋ is revealed with respect to the extraction of germanium.
