Arsenic removal from pyrite cinders in Na<sub>2</sub>S-NaOH solution with parameters optimized using the response surface methodology

WANG Yong-liang; XIAO Li; FU Guo-yan; LIU Ya; HAN Pei-wei; QIAN Peng; YE Shu-feng; CHEN Yun-fa

doi:10.13374/j.issn2095-9389.2018.09.003

Volume 40 Issue 9

Sep. 2018

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Article Navigation > Chinese Journal of Engineering > 2018 > 40(9): 1036-1042

WANG Yong-liang, XIAO Li, FU Guo-yan, LIU Ya, HAN Pei-wei, QIAN Peng, YE Shu-feng, CHEN Yun-fa. Arsenic removal from pyrite cinders in Na2S-NaOH solution with parameters optimized using the response surface methodology[J]. Chinese Journal of Engineering, 2018, 40(9): 1036-1042. doi: 10.13374/j.issn2095-9389.2018.09.003

Citation:

WANG Yong-liang, XIAO Li, FU Guo-yan, LIU Ya, HAN Pei-wei, QIAN Peng, YE Shu-feng, CHEN Yun-fa. Arsenic removal from pyrite cinders in Na₂S-NaOH solution with parameters optimized using the response surface methodology[J]. Chinese Journal of Engineering, 2018, 40(9): 1036-1042. doi: 10.13374/j.issn2095-9389.2018.09.003

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Arsenic removal from pyrite cinders in Na₂S-NaOH solution with parameters optimized using the response surface methodology

doi: 10.13374/j.issn2095-9389.2018.09.003

1) State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
2) School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2017-09-12

Abstract

Abstract

Pyrite cinder is one of the important secondary resources; however, the arsenic typically contained in pyrite cinder is harmful to metallurgical process. The removal of arsenic can improve the value of pyrite cinders. Thus, a pretreatment method for removal of arsenic from pyrite cinders using a Na₂S-NaOH solution was investigated in this paper. A single factor experiment was conducted to determine the appropriate concentration ranges of NaOH and Na₂S, and then the response surface methodology (RSM) was used to optimize the leaching parameters. The results indicate that the optimized RSM model is reliable. The temperature, NaOH concentration, and Na₂S concentration have significant effects on the arsenic removal. The higher temperature is found to be favorable to the leaching of arsenic, and a significant interaction is found between the concentrations of NaOH and Na₂S. The content of arsenic in the leaching slag can be reduced to 0.08% at 80℃ when the concentration of NaOH and Na₂S is 0.34 and 0.12 mol·L^-1, respectively.
- pyrite cinder,
- arsenic,
- response surface methodology,
- leaching,
- pretreatment

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References(6)

References

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