Abstract
The quenching process has the characteristics of complex pollutant composition, high purification difficulty, and serious environmental pollution. In order to meet the national emission standards, the coke quenching tail gas containing SO 2 must be treated. In this paper, halloysite is selected as carrier, modified by low-temperature molten salt etching, manganese oxide is supported by hydrothermal method, halloysite is formed by chitosan gel microspheres, and then SO 2 treatment experiments are carried out. The results show that: The manganese is loaded by hydrothermal reaction, and its oxides are mainly MnO 2 , Mn 2 O 3 , MnO. When the hydrothermal temperature is 180 °C, the metal loading ratio is 5%, and the hydrothermal reaction is 24 h, the SO 2 removal efficiency is maintained at 79.47%, and the total desulfurization amount is 73.22 mg. The halloysite modified by molten salt etching undergoes hydrothermal metal loading. Its removal efficiency is 95.49%, and the total desulfurization amount is 87.98 mg. • Solid waste halloysite can be used as a catalyst carrier. • Molten salt modification and hydrothermal metal loading Mn can efficiently remove SO 2 . • Molten salt etching modified halloysite-based desulfurizer significantly increases O β . • The desulfurization is as high as 95.49%.
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