Stabilization treatment of arsenic-alkali residue (AAR): Effect of the coexisting soluble carbonate on arsenic stabilization
Arsenic-alkali residue (AAR) from antimony smelting is highly hazardous due to its ready leachability of As, seeking for proper disposal such as stabilization treatment. However, As stabilization in AAR would be challenging due to the high content of coexisting soluble carbonate. This study conducte...
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doaj-4c8015bef97f40dcadf9bdd3cabf0a5a2020-11-25T02:55:44ZengElsevierEnvironment International0160-41202020-02-01135Stabilization treatment of arsenic-alkali residue (AAR): Effect of the coexisting soluble carbonate on arsenic stabilizationXin Wang0Jiaqi Ding1Linling Wang2Shuyuan Zhang3Huijie Hou4Jingdong Zhang5Jing Chen6Miao Ma7Daniel C.W. Tsang8Xiaohui Wu9Environmental Science Research Institute, School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, ChinaEnvironmental Science Research Institute, School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, ChinaEnvironmental Science Research Institute, School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; Corresponding authors.Environmental Science Research Institute, School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, ChinaEnvironmental Science Research Institute, School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, ChinaSchool of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, ChinaEnvironmental Science Research Institute, School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; Corresponding authors.Zhongnan Engineering Corporation Limited, Changsha 410000, ChinaDepartment of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, ChinaEnvironmental Science Research Institute, School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, ChinaArsenic-alkali residue (AAR) from antimony smelting is highly hazardous due to its ready leachability of As, seeking for proper disposal such as stabilization treatment. However, As stabilization in AAR would be challenging due to the high content of coexisting soluble carbonate. This study conducted the stabilization treatments of AAR by ferrous sulfate and lime, respectively, and revealed the significant influence of coexisting carbonate. It was found that ferrous sulfate was more efficient than lime, which required only one-tenth of dosages of lime to reduce the As leaching concentration from 915 mg/L to a level below 2.5 mg/L to meet the Chinese regulatory limit. The combining qualitative and quantitative analyses based on XRD, SEM–EDS, and thermodynamic modeling suggested that the formation of insoluble arsenate minerals, ferrous arsenate or calcium arsenate, was the predominant mechanism for As stabilization in the two treatment systems, and their efficiency difference was primarily attributed to the coexisting carbonate, which had a slight effect on ferrous arsenate but severely obstructed calcium arsenate formation. Moreover, the examination of As leaching concentrations in 1-year-cured samples indicated that the long-term stability of ferrous sulfate treatment was far superior to that of lime treatment. This study provides ferrous salts as a promising and green scheme for stabilization treatment of AAR as well as other similar As-bearing solid wastes with coexisting soluble carbonate. Keywords: Arsenic-alkali residue, Arsenic stabilization, Ferrous sulfate, Lime, Arsenate minerals, Coexisting soluble carbonatehttp://www.sciencedirect.com/science/article/pii/S0160412019326649 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Xin Wang Jiaqi Ding Linling Wang Shuyuan Zhang Huijie Hou Jingdong Zhang Jing Chen Miao Ma Daniel C.W. Tsang Xiaohui Wu |
spellingShingle |
Xin Wang Jiaqi Ding Linling Wang Shuyuan Zhang Huijie Hou Jingdong Zhang Jing Chen Miao Ma Daniel C.W. Tsang Xiaohui Wu Stabilization treatment of arsenic-alkali residue (AAR): Effect of the coexisting soluble carbonate on arsenic stabilization Environment International |
author_facet |
Xin Wang Jiaqi Ding Linling Wang Shuyuan Zhang Huijie Hou Jingdong Zhang Jing Chen Miao Ma Daniel C.W. Tsang Xiaohui Wu |
author_sort |
Xin Wang |
title |
Stabilization treatment of arsenic-alkali residue (AAR): Effect of the coexisting soluble carbonate on arsenic stabilization |
title_short |
Stabilization treatment of arsenic-alkali residue (AAR): Effect of the coexisting soluble carbonate on arsenic stabilization |
title_full |
Stabilization treatment of arsenic-alkali residue (AAR): Effect of the coexisting soluble carbonate on arsenic stabilization |
title_fullStr |
Stabilization treatment of arsenic-alkali residue (AAR): Effect of the coexisting soluble carbonate on arsenic stabilization |
title_full_unstemmed |
Stabilization treatment of arsenic-alkali residue (AAR): Effect of the coexisting soluble carbonate on arsenic stabilization |
title_sort |
stabilization treatment of arsenic-alkali residue (aar): effect of the coexisting soluble carbonate on arsenic stabilization |
publisher |
Elsevier |
series |
Environment International |
issn |
0160-4120 |
publishDate |
2020-02-01 |
description |
Arsenic-alkali residue (AAR) from antimony smelting is highly hazardous due to its ready leachability of As, seeking for proper disposal such as stabilization treatment. However, As stabilization in AAR would be challenging due to the high content of coexisting soluble carbonate. This study conducted the stabilization treatments of AAR by ferrous sulfate and lime, respectively, and revealed the significant influence of coexisting carbonate. It was found that ferrous sulfate was more efficient than lime, which required only one-tenth of dosages of lime to reduce the As leaching concentration from 915 mg/L to a level below 2.5 mg/L to meet the Chinese regulatory limit. The combining qualitative and quantitative analyses based on XRD, SEM–EDS, and thermodynamic modeling suggested that the formation of insoluble arsenate minerals, ferrous arsenate or calcium arsenate, was the predominant mechanism for As stabilization in the two treatment systems, and their efficiency difference was primarily attributed to the coexisting carbonate, which had a slight effect on ferrous arsenate but severely obstructed calcium arsenate formation. Moreover, the examination of As leaching concentrations in 1-year-cured samples indicated that the long-term stability of ferrous sulfate treatment was far superior to that of lime treatment. This study provides ferrous salts as a promising and green scheme for stabilization treatment of AAR as well as other similar As-bearing solid wastes with coexisting soluble carbonate. Keywords: Arsenic-alkali residue, Arsenic stabilization, Ferrous sulfate, Lime, Arsenate minerals, Coexisting soluble carbonate |
url |
http://www.sciencedirect.com/science/article/pii/S0160412019326649 |
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