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Extraction of arsenic from arsenic-containing cobalt and nickel slag and preparation of arsenic-bearing compounds
Alternative TitleTrans. Nonferrous Met. Soc. China
Yu, Guo-lin1,2; Zhang, Ying2; Zheng, Shi-li2; Zou, Xing1; Wang, Xiao-hui2; Zhang, Yi2
2014-06-01
Source PublicationTRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
ISSN1003-6326
Volume24Issue:6Pages:1918-1927
AbstractThe arsenic extraction from the arsenic-containing cobalt and nickel slag, which came from the purification process of zinc sulfate solution in a zinc smelting factory, was investigated. The alkaline leaching method was proposed according to the mode of occurrence of arsenic in the slag and its amphoteric characteristic. The leaching experiments were conducted in the alkaline aqueous medium, with bubbling of oxygen into the solution, and the optimal conditions for leaching arsenic were determined. The results showed that the extraction rate of arsenic was maximized at 99.10% under the optimal conditions of temperature 140 degrees C, NaOH concentration 150 g/L, oxygen partial pressure 0.5 MPa, and a liquid-to-solid ratio 5:1. Based on the solubilities of As2O5, ZnO and PbO in NaOH solution at 25 degrees C, a method for the separation of As in the form of sodium arsenate salt from the arsenic-rich leachate via cooling crystallization was established, and the reaction medium could be fully recycled. The crystallization rate was confirmed to reach 88.9% (calculated on the basis of Na3AsO4) upon a direct cooling of the hot leachate down to room temperature. On the basis of redox potentials, the sodium arsenate solution could be further reduced by sulfur dioxide (SO2) gas to arsenite, at a reduction yield of 92% under the suitable conditions. Arsenic trioxide with regular octahedron shape could be prepared successfully from the reduced solution, and further recycled to the purification process to purify the zinc sulfate solution. Also, sodium arsenite solution obtained after the reduction of arsenate could be directly used to purify the zinc sulfate solution. Therefore, the technical scheme of alkaline leaching with pressured oxygen, cooling crystallization, arsenate reduction by SO2 gas, and arsenic trioxide preparation, provides an attractive approach to realize the resource utilization of arsenic-containing cobalt and nickel slag.; The arsenic extraction from the arsenic-containing cobalt and nickel slag, which came from the purification process of zinc sulfate solution in a zinc smelting factory, was investigated. The alkaline leaching method was proposed according to the mode of occurrence of arsenic in the slag and its amphoteric characteristic. The leaching experiments were conducted in the alkaline aqueous medium, with bubbling of oxygen into the solution, and the optimal conditions for leaching arsenic were determined. The results showed that the extraction rate of arsenic was maximized at 99.10% under the optimal conditions of temperature 140 degrees C, NaOH concentration 150 g/L, oxygen partial pressure 0.5 MPa, and a liquid-to-solid ratio 5:1. Based on the solubilities of As2O5, ZnO and PbO in NaOH solution at 25 degrees C, a method for the separation of As in the form of sodium arsenate salt from the arsenic-rich leachate via cooling crystallization was established, and the reaction medium could be fully recycled. The crystallization rate was confirmed to reach 88.9% (calculated on the basis of Na3AsO4) upon a direct cooling of the hot leachate down to room temperature. On the basis of redox potentials, the sodium arsenate solution could be further reduced by sulfur dioxide (SO2) gas to arsenite, at a reduction yield of 92% under the suitable conditions. Arsenic trioxide with regular octahedron shape could be prepared successfully from the reduced solution, and further recycled to the purification process to purify the zinc sulfate solution. Also, sodium arsenite solution obtained after the reduction of arsenate could be directly used to purify the zinc sulfate solution. Therefore, the technical scheme of alkaline leaching with pressured oxygen, cooling crystallization, arsenate reduction by SO2 gas, and arsenic trioxide preparation, provides an attractive approach to realize the resource utilization of arsenic-containing cobalt and nickel slag.
KeywordArsenic-containing Cobalt And Nickel Slag Alkaline Leaching Cooling Crystallization Sodium Arsenate Arsenic Trioxide
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1016/S1003-6326(14)63272-6
URL查看原文
Indexed BySCI
Language英语
WOS KeywordREDUCTION
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000339278400038
Citation statistics
Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/11017
Collection研究所(批量导入)
Affiliation1.Univ Sci & Technol Beijing, Sch Met & Ecol Engn, Beijing 100083, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Yu, Guo-lin,Zhang, Ying,Zheng, Shi-li,et al. Extraction of arsenic from arsenic-containing cobalt and nickel slag and preparation of arsenic-bearing compounds[J]. TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA,2014,24(6):1918-1927.
APA Yu, Guo-lin,Zhang, Ying,Zheng, Shi-li,Zou, Xing,Wang, Xiao-hui,&Zhang, Yi.(2014).Extraction of arsenic from arsenic-containing cobalt and nickel slag and preparation of arsenic-bearing compounds.TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA,24(6),1918-1927.
MLA Yu, Guo-lin,et al."Extraction of arsenic from arsenic-containing cobalt and nickel slag and preparation of arsenic-bearing compounds".TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA 24.6(2014):1918-1927.
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