METALS AND METAL MATRIX COMPOSITES |
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Study on Improving Dry Desulphurization Performance by Regulating Metal Oxides in Steel Slag |
WANG Xinming, MA Xiaoyu*, CUI Suping, WANG Jianfeng, WANG Yali, MA Jikun
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Colloge of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China |
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Abstract The steel slag contains a lot of alkali metal oxides, which makes it have the potential as flue gas desulfurization agent. The modification of steel slag for dry flue gas desulfurization is of profound significance for ecological environment protection and resource conservation. In this work, the steel slag was modified by adjusting the composition of metal oxide to improve its desulfurization performance. Firstly, the promotion effect of the main metal oxides Fe2O3, Al2O3, MgO and MnO in the chemical composition of steel slag on CaO and dry desulfurization of steel slag was confirmed, and then the composition of the main metal oxides of steel slag was regulated by acid and alkali treatment to improve the desulfurization performance. XRF, XRD, XPS, SO2-TPD and other test methods were used to study the reasons for the improvement of desulfurization performance. The results show that after modification, some metal ions existing in the same structure of solid solution are separated into metal oxides. The content of lattice oxygen and adsorbed oxygen on the surface of steel slag increases, the proportion of lattice oxygen increases, and the physical and chemical adsorption capacity of SO2 is enhanced. When the pH value is 13, the best effect is achieved, and the desulfurization rate can reach 93%.
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Published: 25 April 2023
Online: 2023-04-24
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Fund:National Key R & D Program of China (2017YFB0310802) and the Science and Technology Plan of Beijing Municipal Education Commission(KM201910005011). |
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