Emission Characteristics of SO2 During Roasting of Iron Ore Pellets

会议论文
发表日期：

2024年

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Rongguang Xu,
Yunqing Tian,
Dawei Sun,
Ruiqing Qian,
Xiangjuan Dong,
Wenwang Liu,
Chengwei Ma,
Xiaojiang Wu,
Luyao Zhao,
Tao Yang,
Li Ma

摘要

Baking cup experimentsBaking cup experiment were carried out and emission characteristics of SO2SO2 during roastingRoasting of iron ore pelletsIron ore pellets were investigated. Concentration of SO2SO2 starts to increase when the temperature is about 800 °C, then reaches a peak when the temperature is just above 900 °C. Furthermore, emission characteristics of SO2SO2 during roastingRoasting of iron ore pelletsIron ore pellets in travelling grate machinetravelling grate machine were investigated. There are two peaks of concentration of SO2SO2, and the lower peak is in downdraft drying section, while the higher peak is in roastingRoasting section. Concentration of SO2SO2 is at a low level in preheat section, then begins to increase in roastingRoasting section, and reaches peak value in Number 11 wind boxes. Sulfur content in acid pellets is about only one fifth of that in alkaline ones, which might relate to calcium in iron ore pelletsIron ore pellets. Except for chemical compositions, temperature is another important factor for sulfur content in iron ore pelletsIron ore pellets. Sulfur in iron ore pelletsIron ore pellets made from roastingRoasting test was analyzed by XPS, and results show that there is mainly sulfate.