The influence of Fe2O3 to sulfur fixation efficiency of CaO for coal powder combustion

For coal powder in southwest of China, sulfur fixing technology of coal powder combustion in this paper has been studied by thermodynamics calculation and experiment. Results show that, the sulfur fixation efficiency of CaO in experiment is highest; when n(CaO)/n(S) ratio equal to 2.0, additive Fe₂O₃ enhances the sulfur fixation efficiency of fixing agent CaO. Fe₂O₃ is easier to decompound gradually to Fe₂O₃ and FeO at the reducing action of C. One side the oxides of iron can catalyze the reaction of sulfur-fixing, on the other hand Fe₂O₃ can absorbs SO₂ to turn to FeSO₄.