Abstract
In order to give full play to the alkaline neutralization value of carbide slag and reduce the environmental hazards of carbide slag, it is of great practical significance to study the resource utilization of carbide slag. The adsorption of sulfur compounds on carbide slag was studied in the laboratory, and the process parameters of carbide slag desulfurization were explored and optimized. The specific surface area, pore distribution, and other physicochemical parameters were analyzed by XRD and SEM, which explained the changes of products and carbide slag before and after desulfurization. The test results show that carbide slag and limestone have almost the same desulfurization effect. The kinetics of carbide slag desulfurization process conforms to pseudo-first-order kinetics, and the sulfur content of calcium carbide slag reaches to 1000 mgSO2·g−1. A project demonstration was carried out in the gold smelting Tielu Plant of Zhenyuan Huashuo Precious Metals Development Co., Ltd., in Yunnan. The results of the 2-year demonstration project showed that the desulphurization efficiency of the four-stage series desulphurization tower exceeds 95%. The concentration of sulfur dioxide in the discharged flue gas is reduced to less than 20 mg·m−3, which meets the requirements of ultra-low emission standard in China. Therefore, whether from theoretical research or engineering practice analysis, it is feasible to replace limestone with calcium carbide slag for flue gas desulfurization. The paper also discusses the problems existing in the demonstration project, and provides a new idea of “using waste to treat waste” in order to solve the problem of carbide slag disposal.
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The datasets used or analyzed during the current study are available from the corresponding author on reasonable request.
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The authors sincerely thank the anonymous reviewers.
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This study was financially supported by the National Key R&D Program of China (2019YFC0214400).
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Jiamin Qi: data curation, formal analysis, methodology, investigation, formal analysis, writing—original draft. Bin Li: supervision, resources, writing—review and editing. PengXiang Zhou: methodology, conceptualization, investigation, supervision. Di Yang: conceptualization, data curation. Zixuan Wang: writing—review and editing. The manuscript was written through contributions of all authors. All authors have given approval to the final version of the manuscript.
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Qi, J., Zhou, P., Yang, D. et al. Desulphurization mechanism and engineering practice of carbide slag. Environ Sci Pollut Res 29, 88519–88530 (2022). https://doi.org/10.1007/s11356-022-21894-4
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DOI: https://doi.org/10.1007/s11356-022-21894-4