Using Phosphate rock as a material,

Using Phosphate rock as a material, and the materials are pre-treated by microwave roasting to research the effect of phosphate rock slurry on the removal of SO2 after microwave roasting. The effects of gas flow rate, temperature, solid-liquid ratio and oxygen content on the desulfurization of slurry were investigated when the SO2 concentration was 2500 mg·m-3, and the best gas flow of slurry desulfurization were 500 mL·min-1, the slurry temperature is 40 ℃, the solid-liquid ratio is 7:400 g:mL, the oxygen content is 5%. The IC, ICP, XRD, SEM were used to characterize and analyze the phosphate rock slurry and phosphate rock before and after microwave modification. The results showed that the main components of the raw ore were Ca5(PO4)3F, CaMg(CO3)2 and SiO2. However, after microwave modified treatment, the phase structure of the phosphate rock has changed, and cracks have appeared on the surface of the ore powder; the concentration of Fe3+ and Mn2+ in the phosphate rock slurry has increased significantly; the content of Fe in the phosphate rock after microwave modified is the same as before the irradiation 1.72 times. According to calculations, the activation energy of slurry desulfurization after microwave modified is significantly reduced by 37.1% compared with raw phosphate rock slurry. The results of response surface design experiments showed that the slurry temperature, solid-liquid ratio, and oxygen content all have a certain interaction effect on the desulfurization rate, and the interaction between solid-liquid ratio and oxygen content is the most obvious.