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Recovery of Germanium via H2SO4/MnO2 Leaching–NaAc Leaching/Na2CO3 Precipitation–Tri(octyl-decyl) Amine Stepwise Solvent Extraction
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-12-05 , DOI: 10.1021/acssuschemeng.0c06526 Tao Jiang 1 , Tao Zhang 1 , Zhihong Liu 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-12-05 , DOI: 10.1021/acssuschemeng.0c06526 Tao Jiang 1 , Tao Zhang 1 , Zhihong Liu 1
Affiliation
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Zinc and germanium are typically recovered by sulfuric acid leaching–tannin precipitation from germanium-bearing secondary zinc oxide (SZO). However, low recovery rate of Ge and large consumption of tannin are the obvious limitations. Herein, we propose a novel recovery process involving three main steps: (1) SZO is leached by H2SO4 solution (pH 2.0 ± 0.5), and MnO2 oxidation leaching is conducted for the residue (H2SO4: 10–40 g/L); (2) the oxidation leaching residue is treated with NaAc solution and, subsequently, Na2CO3 (or CO2) to precipitate lead and obtain PbCO3; the resulting solution is reused for the leaching process (step 2); (3) a tri(octyl-decyl) amine(N235)/tributyl phosphate/sulfonated kerosene system (no preacidification) is used to recover germanium from the oxidation leachate; the loaded organic phase is employed as an extractant to recover germanium from the leachate obtained in step 1. The raffinate could be sent to a zinc plant, and the loaded organic phase could be reused after stripping and washing. Up to 98% zinc and germanium leaching efficiencies, 98% germanium extraction efficiency, >90% lead recovery, and 97.87% purity PbCO3 product were achieved. Therefore, a relatively sustainable treatment involving closed-circuit circulation of leaching agents and extractants for SZO was proposed.
中文翻译：
通过H 2 SO 4 / MnO 2浸提-NaAc浸提/ Na 2 CO 3沉淀-三（辛基-癸基）胺逐步萃取萃取锗
锌和锗通常通过硫酸浸出法从含锗的次级氧化锌（SZO）中沉淀出来。然而，锗的回收率低和单宁消耗量大是明显的局限性。本文中，我们提出了一种新颖的回收工艺，涉及三个主要步骤：（1）通过H 2 SO 4溶液（pH 2.0±0.5）浸提SZO ，并对残留物进行MnO 2氧化浸出（H 2 SO 4：10– 40克/升）; （2）将氧化浸出残渣用NaAc溶液处理，然后用Na 2 CO 3（或CO 2）处理，使铅沉淀，得到PbCO 3。; 所得解决方案重新用于浸出过程（步骤2）；（3）使用三（辛基-癸基）胺（N235）/磷酸三丁酯/磺化煤油体系（不进行预酸化）从氧化浸出液中回收锗。负载的有机相被用作萃取剂，以从步骤1中获得的浸出液中回收锗。萃余液可送至锌厂，并且负载的有机相在汽提和洗涤后可重复使用。实现了高达98％的锌和锗浸出效率，98％的锗萃取效率，> 90％的铅回收率和97.87％的PbCO 3纯度产品。因此，提出了一种相对可持续的处理方法，包括用于SZO的浸出剂和萃取剂的闭路循环。
更新日期：2020-12-21
中文翻译：
通过H 2 SO 4 / MnO 2浸提-NaAc浸提/ Na 2 CO 3沉淀-三（辛基-癸基）胺逐步萃取萃取锗
锌和锗通常通过硫酸浸出法从含锗的次级氧化锌（SZO）中沉淀出来。然而，锗的回收率低和单宁消耗量大是明显的局限性。本文中，我们提出了一种新颖的回收工艺，涉及三个主要步骤：（1）通过H 2 SO 4溶液（pH 2.0±0.5）浸提SZO ，并对残留物进行MnO 2氧化浸出（H 2 SO 4：10– 40克/升）; （2）将氧化浸出残渣用NaAc溶液处理，然后用Na 2 CO 3（或CO 2）处理，使铅沉淀，得到PbCO 3。; 所得解决方案重新用于浸出过程（步骤2）；（3）使用三（辛基-癸基）胺（N235）/磷酸三丁酯/磺化煤油体系（不进行预酸化）从氧化浸出液中回收锗。负载的有机相被用作萃取剂，以从步骤1中获得的浸出液中回收锗。萃余液可送至锌厂，并且负载的有机相在汽提和洗涤后可重复使用。实现了高达98％的锌和锗浸出效率，98％的锗萃取效率，> 90％的铅回收率和97.87％的PbCO 3纯度产品。因此，提出了一种相对可持续的处理方法，包括用于SZO的浸出剂和萃取剂的闭路循环。
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