1. School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China; 2. Sichuan Lomon Titanium Industry Corp., Ltd., Mianzhu 618200, China
Abstract: Thermal cracking process of ferrous sulfate with coal as a reducing agent is investigated.The effects of ferrous sulfate hydrate,coal type,C/S molar ratio and reaction temperature on the concentration of SO2 in furnace gas,and the desulfurization rate of ferrous sulfate are studied.The results demonstrate that ferrous sulfate hydrate is dehydrated at first and decomposes then,while water vapor generated from the dehydration dilutes the concentration of SO2 in the furnace gas.SO2 concentration in furnace gas can exceed 11.12%,the desulfurization rate of ferrous sulfate can exceed 99%,and iron content in solid phase after calcination can be more than 60% when the reaction temperature is at 800℃ and C/S molar ratio is 1.This technology can provide qualified feedstock for sulfuric acid production and qualified iron concentrate for iron and steel smelting.
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