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| Status of Alkaline Dearsenization Technology in Secondary Arsenic-Bearing Materials in Nonferrous Metallurgy |
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Received:July 31, 2019
Revised:September 17, 2019
Accepted:September 23, 2019
Published Online:May 14, 2020
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| DOI： |
| KeyWord:secondary arsenic-bearing materials; alkaline dearsenization technology; selective removal of arsenic; harmless treatment; resource utilization |
| Author | Institution |
| WEI Xiaoling |
Baiyin Institute of Mining and Metallurgy |
| WANG Xiaoyang |
Guangdong Polytechnic of Environmental Protection Engineering |
| WANG Wenxiang |
Guangdong Polytechnic of Environmental Protection Engineering |
| FANG Hongsheng |
Guangdong Polytechnic of Environmental Protection Engineering |
| LIU Runqi |
Baiyin Institute of Mining and Metallurgy |
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| Abstract: |
| In this paper, the chemical composition characteristics of typical secondary arsenic-bearing materials are analyzed. The alkaline dearsenization process of secondary arsenic-bearing materials produced in nonferrous smelting industry and its principle are summarized, including hydro-dearsenization process or combined pyro-hydro dearsenization process. Three alkaline hydro-dearsenization leaching systems are commonly used: NaOH single- alkali leaching, NaOH-Na2S mixed-alkali leaching and NaOH+Na2S mixed-alkali two-stage leaching. Hydrogen peroxide, pressure, aeration, microwave, ball milling and other oxidation methods are used to enhance arsenic leaching from secondary arsenic-bearing materials. The combined pyro-hydro dearsenization process mainly includes low-temperature alkaline smelting-water leaching, pre-oxidation roasting -alkaline leaching and low-temperature alkaline roasting-hot water leaching. Low-temperature alkaline roasting-hot water leaching process has good selectivity in arsenic removal and wide applicability of secondary arsenic-bearing materials. Based on all the existing research, the existing problems of alkaline dearsenization technology and the research direction of harmless treatment and resource utilization of secondary arsenic-bearing materials are pointed out. |
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