At present, the continuous accumulation of the flue gas desulfurization (FGD) gypsum in steel plants leads to the serious environmental issues and resource waste. To achieve green and sustainable development for the steel industry, it is significant to improve the usage of by-product gypsum. Employing the sintering FGD gypsum, ferric oxide, and graphite carbon as raw materials, the effects of the carbon content, reaction time, and molar ratio of CaO to Fe₂O₃ on the desulfurization rate of gypsum were studied based on the orthogonal experiment. The results show that the order of the three influencing factors on the desulfurization rate of FGD gypsum is: molar ratio of CaO to Fe₂O₃ > reaction time > carbon content. Under the optimal conditions of 20 wt.% carbon content, 4 h reaction time, and 1:1 molar ratio of CaO to Fe₂O₃, the desulfurization rate of desulfurization gypsum is 95.79%, and 97.57 wt.% of calcium ferrite appears in the solid product, which can be used as sintering additive to increase the economic benefits of enterprises and realize the green ecological development mode of internal generation and internal digestion of solid waste in iron and steel enterprises.

目前，钢铁厂烟气脱硫石膏的不断堆积导致严重的环境问题和资源浪费。为了实现钢铁行业的绿色可持续发展，改善副产品石膏的使用具有重要意义。以烧结烟气脱硫石膏，三氧化二铁和石墨碳为原料，通过正交试验研究了碳含量，反应时间，CaO与Fe ₂ O _3的摩尔比对石膏脱硫率的影响。结果表明，影响烟气脱硫石膏脱硫率的三个因素依次为：CaO与Fe ₂ O _3的摩尔比。 >反应时间>碳含量。在碳含量为20％（重量），反应时间为4h，CaO与Fe ₂ O ₃摩尔比为1：1的最佳条件下，脱硫石膏的脱硫率为95.79％，铁素体钙的出现率为97.57％。用作烧结添加剂，可提高企业的经济效益，实现钢铁企业内部产生和内部消化固体废物的绿色生态发展模式。