Upgrading Iron Ore by Microwave Desulfurization with Reduction of Harmful SO2 Emission
摘要
In this study, a novel method for simultaneously improving desulfurizationDesulfurization of iron oreIron ore and lowering SO2SO2 emission in flue gasFlue gas at low temperature by microwave roasting of the ore with the addition of urea was proposed. The results showed that the desulfurizationDesulfurization percentage of iron oreIron ore increased significantly with lower SO2SO2 emission in flue gasFlue gas when urea was added. By adding 1.5 wt% ureaUrea into iron oreIron ore and roastingRoasting the mixtureMixture at 250 ℃ for 60 min, the desulfurizationDesulfurization percentage of roasted iron oreIron ore reached 67.37% and the SO2SO2 emission in flue gasFlue gas decreased by 74.68%. After leaching of the roasted ore with water at room temperature for 30 min, the residual sulfur content of the leachingLeaching product decreased to 0.21 wt%. This study provided a good example for efficient, low-cost, and environmentally friendly desulfurizationDesulfurization of iron oreIron ore.