Kinetic analysis on carbothermic reduction of GeO2 for germanium recovery from waste scraps
Kinetic analysis on carbothermic reduction of GeO2 for germanium recovery from waste scraps
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GeO2碳热还原废废料回收锗的动力学分析
DOI：
10.1016/j.jclepro.2018.09.212
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发表时间：
2019-01
影响因子：
11.1
通讯作者：
Xu Zhenming
中科院分区：
文献类型：
--
作者：
Song Qingming;Zhang Lingen;Xu Zhenming
锗是一种稀缺的战略资源，在红外器件、聚合催化剂和光纤等领域有着广泛的应用。工业废渣和粉煤灰是主要的二次锗资源，锗以GeO 2形式存在。碳热还原法是一种很有前途的锗回收技术，其可行性已得到证实。然而，该回收过程的动力学和反应机理尚不清楚，阻碍了对该过程的深入了解和回收技术的进一步改进。本文对GeO 2的碳热还原反应动力学和反应机理进行了详细的研究。确定了反应路径的转换：路径I：第一阶段还原产物GeO从反应区脱附;路径II：第二阶段Ge成为主要还原产物并缓慢蒸发。计算了这两条路径的动力学参数，其中动力学模型对应于自催化模型。一氧化锗（GeO）是主要的回收物，并伴有少量的Ge和GeO 2，提出了一种全面的还原方案。研究结果为碳热还原法从废金属中回收锗提供了理论依据和指导意义。
Germanium, as scarce and strategic resource, is widely used in infrared devices, polymerization catalysts and optical fibers. Manufacturing scraps and coal fly ash are the main secondary germanium resources, where germanium exists as GeO2. Carbothermic reduction method is a promising technology for germanium recovery from such wastes and its feasibility has been confirmed recently. However, the kinetics and reaction mechanism of the recovery process remained unclear, which blocked deep insight into the process and further improvement of recovery technology. In this study, the kinetics of carbothermic reduction of GeO2as well as reaction mechanism was studied in detail. A transformation of reaction path was confirmed: Path I: Reduction product GeO desorbed from reaction region at the first stage; Path II: Ge became the main reduction product and evaporate slowly at the second stage. The kinetic parameters of these two paths were calculated where the kinetic model corresponded to an autocatalytic model. Germanium monoxide (GeO) was the main recovered species accompanied with a small amount of Ge and GeO2and an overall reduction scheme was also proposed. These results can provide theoretical basics and implications for germanium recovery from waste scraps through carbothermic reduction method.
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DOI：
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发表时间：
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期刊：
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影响因子：
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