The Nonferrous Metals Society of China

Transactions of Nonferrous Metals Society of China >

2022 , Vol. 32 >Issue 3: 1041 - 1049

DOI: https://doi.org/10.1016/S1003-6326(22)65853-9

Mining, Minerals Processing and Metallurgical Engineering

Process and mechanism of hydrothermal stabilization forarsenic sulfide sludge containing elemental sulfur

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  • Hui XU1, Li-wei YAO1, Qiu-jing XU1, Yun-yan WANG1,2, Xiao-bo MIN1,2,Yong KE1,2, Yong-jian LUO1, Jin-yao TANG1, Si-ang PENG3, Li-min ZHANG 1, Jia-li DU1
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.The High School Attached To Hunan Normal University, Changsha 410006, China

Online published: 2022-03-25

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Abstract

An optimized hydrothermal treatment was employed to stabilize the arsenic sulfide sludge (ASS).Under the optimal conditions (160 °C, 2 h, liquid-to-solid (L/S) ratio of 1:1, and initial pH of 2), the leaching concentrations of As and Cd decreased from 504.0 and 12.0 mg/L to 1.23 and 0.03 mg/L of the treated ASS, respectively. The results indicate that the stabilization of the ASS was achieved through structure transformation from the particles into a bulk and the speciation transformation of As and Cd. Besides, sulfur in the ASS could significantly improve the stabilization property due to its melting and polymerization.

Cite this article

HuiXU,Li-weiYAO,Qiu-jingXU,Yun-yanWANG,Xiao-boMIN,YongKE,Yong-jianLUO,Jin-yaoTANG,Si-angPENG,Li-minZHANG,Jia-liDU . Process and mechanism of hydrothermal stabilization forarsenic sulfide sludge containing elemental sulfur[J]. Transactions of Nonferrous Metals Society of China, 2022 , 32(3) : 1041 -1049 . DOI: 10.1016/S1003-6326(22)65853-9

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