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
The extraction separation of germanium from indium raffinate in hydrometallurgical zinc process was discussed. The conditions and mechanism of the extraction with hydroxamic acid HGS98 have been investigated in detail...The extraction separation of germanium from indium raffinate in hydrometallurgical zinc process was discussed. The conditions and mechanism of the extraction with hydroxamic acid HGS98 have been investigated in detail. The results show that u sing 2% (mass fraction) hydroxamic acid HGS98 and 5% D 2EHPA as synergist, germanium is extracted (1 stage) over 99% in 5 min at phase ratio ( V o∶ V a) of 1∶5 from indium raffinate with original acidity. Then, using 2 mol·L -1 NH 4F as strip liquor, the stripping recovery is over 98% in 15 min at phase ratio of 1∶1. This process has the following advantages:easy to operate, high recovery and selectivity, and lower investment cost. It provides a new way to recover rare metal-germanium from metallurgical spent residues.展开更多
煤系伴生资源提取不可避免产生大量低浓度含锗废液,导致稀散金属锗资源的流失,并污染环境。采用酒石酸改性铁锰氧化物(JFMBO)作为吸附材料富集回收煤浸出液中低浓度锗,通过XRD、BET、Zeta电位等测试手段研究了JFMBO的晶体结构和表面性...煤系伴生资源提取不可避免产生大量低浓度含锗废液,导致稀散金属锗资源的流失,并污染环境。采用酒石酸改性铁锰氧化物(JFMBO)作为吸附材料富集回收煤浸出液中低浓度锗,通过XRD、BET、Zeta电位等测试手段研究了JFMBO的晶体结构和表面性质等特征,并探究了JFMBO对锗的吸附行为。结果表明,改性铁锰氧化物吸附锗的最佳投加量为2 g L;JFMBO对锗的吸附容量与溶液pH呈现正相关的趋势;JFMBO对锗的吸附容量随离子强度的增大而降低,升高温度有助于JFMBO对锗吸附反应的进行。锗在JFMBO上的吸附过程可用准二级动力学方程描述,吸附等温线更符合Langmuir模型,25℃下锗的最大饱和吸附容量为169.535μmol g。JFMBO可再生使用,循环进行3次吸附-脱附后仍可保持较高的吸附效率。展开更多
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.
文摘The extraction separation of germanium from indium raffinate in hydrometallurgical zinc process was discussed. The conditions and mechanism of the extraction with hydroxamic acid HGS98 have been investigated in detail. The results show that u sing 2% (mass fraction) hydroxamic acid HGS98 and 5% D 2EHPA as synergist, germanium is extracted (1 stage) over 99% in 5 min at phase ratio ( V o∶ V a) of 1∶5 from indium raffinate with original acidity. Then, using 2 mol·L -1 NH 4F as strip liquor, the stripping recovery is over 98% in 15 min at phase ratio of 1∶1. This process has the following advantages:easy to operate, high recovery and selectivity, and lower investment cost. It provides a new way to recover rare metal-germanium from metallurgical spent residues.
文摘煤系伴生资源提取不可避免产生大量低浓度含锗废液,导致稀散金属锗资源的流失,并污染环境。采用酒石酸改性铁锰氧化物(JFMBO)作为吸附材料富集回收煤浸出液中低浓度锗,通过XRD、BET、Zeta电位等测试手段研究了JFMBO的晶体结构和表面性质等特征,并探究了JFMBO对锗的吸附行为。结果表明,改性铁锰氧化物吸附锗的最佳投加量为2 g L;JFMBO对锗的吸附容量与溶液pH呈现正相关的趋势;JFMBO对锗的吸附容量随离子强度的增大而降低,升高温度有助于JFMBO对锗吸附反应的进行。锗在JFMBO上的吸附过程可用准二级动力学方程描述,吸附等温线更符合Langmuir模型,25℃下锗的最大饱和吸附容量为169.535μmol g。JFMBO可再生使用,循环进行3次吸附-脱附后仍可保持较高的吸附效率。
