Issue |
Metall. Res. Technol.
Volume 115, Number 2, 2018
|
|
---|---|---|
Article Number | 203 | |
Number of page(s) | 10 | |
DOI | https://doi.org/10.1051/metal/2017093 | |
Published online | 06 December 2017 |
Regular Article
Microwave alkaline roasting-water dissolving process for germanium extraction from zinc oxide dust and its analysis by response surface methodology (RSM)
1
Key Laboratory of Light Metal Materials Processing Technology of Guizhou Provinces,
Guiyang
550003, PR China
2
School of Materials and Metallurgical Engineering, Guizhou Institute of Technology,
Guiyang
550003, PR China
* e-mail: fuchunhelichun@126.com
Received:
26
August
2017
Accepted:
9
November
2017
Microwave alkaline roasting-water dissolving process was proposed to improve the germanium (Ge) extraction from zinc oxide (ZnO) dust. The effects of important parameters were investigated and the process conditions were optimized using response surface methodology (RSM). The Ge extraction is consistent with the linear polynomial model type. Alkali-material ratio, microwave heating temperature and leaching temperature are the significant factors for this process. The optimized conditions are obtained as follows, alkali-material ratio of 0.9 kg/kg, aging time of 1.12 day, microwave heating at 658 K for 10 min, liquid–solid ratio of 4.31 L/kg, leaching temperature at 330 K, leaching time of 47 min with the Ge extraction about 99.38%. It is in consistence with the predictive value of 99.31%. Compared to the existed alkaline roasting process heated by electric furnace in literature, the alkaline roasting temperature and holding time. It shows a good prospect on leaching Ge from ZnO dust with microwave alkaline roasting-water dissolving process.
Key words: zinc oxide dust / germanium / microwave alkaline roasting / water leaching / response surface methodology
© EDP Sciences, 2017
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