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Volume 9
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10.3390/min9020130
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Article

Release Behaviors of Arsenic and Heavy Metals from Arsenic Sulfide Sludge during Simulated Storage

by
Liwei Yao
1,
Xiaobo Min
1,2,
Yong Ke
1,2,*,
Yunyan Wang
1,2,
Yanjie Liang
1,2,
Xu Yan
1,2,
Hui Xu
1,
Jiangchi Fei
1,
Yuancheng Li
1,
Degang Liu
1 and
Kang Yang
3
1
School of Metallurgy and Environment, Central South University, Changsha 410083, China
2
Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha 410083, China
3
School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(2), 130; https://doi.org/10.3390/min9020130
Submission received: 21 December 2018 / Revised: 10 February 2019 / Accepted: 20 February 2019 / Published: 23 February 2019
(This article belongs to the Special Issue Arsenic Geochemistry and Health)
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Abstract

Non-ferrous metal smelting enterprises produce hundreds of thousands of tons of arsenic sulfide sludge (ASS) each year in China. Most of the ASS are stored at the companies without enough preventive measures. During the storage and natural drying process, arsenic sulfide is easily oxidized, thereby causing secondary pollution and increasing environmental risks. In this paper, experiments of simulated storage were used to study the release characteristics of heavy metals. During the simulated storage, the release concentrations of As, Pb, and Cd increased rapidly at first and then slowly. Although the total amount of arsenic released was the largest, the release ratio was in the order of Cd > Pb > As. The effects of different atmospheres and conditions on the release of arsenic and heavy metals were explored. The more the H2SO4 in the sludge, the higher the release concentration, and the addition of an appropriate amount of Ca(OH)2 is beneficial for reducing the release of heavy metals. Finally, SEM, XRD and TG-DTG techniques were carried out to confirm that the release of heavy metals was caused by the oxidation process resulting from the residual H2SO4 in the ASS and the air.
Keywords: arsenic sulfide sludge; simulated storage; heavy metals release; oxidization arsenic sulfide sludge; simulated storage; heavy metals release; oxidization
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MDPI and ACS Style

Yao, L.; Min, X.; Ke, Y.; Wang, Y.; Liang, Y.; Yan, X.; Xu, H.; Fei, J.; Li, Y.; Liu, D.; et al. Release Behaviors of Arsenic and Heavy Metals from Arsenic Sulfide Sludge during Simulated Storage. Minerals 2019, 9, 130. https://doi.org/10.3390/min9020130

AMA Style

Yao L, Min X, Ke Y, Wang Y, Liang Y, Yan X, Xu H, Fei J, Li Y, Liu D, et al. Release Behaviors of Arsenic and Heavy Metals from Arsenic Sulfide Sludge during Simulated Storage. Minerals. 2019; 9(2):130. https://doi.org/10.3390/min9020130

Chicago/Turabian Style

Yao, Liwei, Xiaobo Min, Yong Ke, Yunyan Wang, Yanjie Liang, Xu Yan, Hui Xu, Jiangchi Fei, Yuancheng Li, Degang Liu, and et al. 2019. "Release Behaviors of Arsenic and Heavy Metals from Arsenic Sulfide Sludge during Simulated Storage" Minerals 9, no. 2: 130. https://doi.org/10.3390/min9020130

APA Style

Yao, L., Min, X., Ke, Y., Wang, Y., Liang, Y., Yan, X., Xu, H., Fei, J., Li, Y., Liu, D., & Yang, K. (2019). Release Behaviors of Arsenic and Heavy Metals from Arsenic Sulfide Sludge during Simulated Storage. Minerals, 9(2), 130. https://doi.org/10.3390/min9020130

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