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<p>High-sulfur iron concentrates emit SO<sub>2</sub> into the flue gas during pellet induration. To investigate the effect of the SO<sub>2</sub> cycle on pellet quality in the grate-kiln process, sulfur balance analysis, thermodynamic calculations, and pellet production experiments under simulated flue gas circulation conditions were conducted. The results indicated that SO<sub>2</sub> circulation inhibited desulfurization and deteriorated pellet strength. SO<sub>2</sub> absorption increased the pellet sulfur content to 0.70&#xa0;wt.% during the downdraft drying phase, and the absorption could be aggravated by the moisture. The desulfurization rate of the preheating process was also decreased to 16.67%, resulting from the refractory sulfate generation. Sulfur content of the roasted pellets dropped to 0.13&#xa0;wt.% because of the aluminosilicate generation. The finished pellet sulfur content further decreased to 0.08&#xa0;wt.% due to the fresh air during the cooling process. Eventually, optimization measures were proposed when high-sulfur iron concentrates were used for oxidized pellet preparation.</p>

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Effect of SO2 circulation on pellet quality in grate-kiln process

  • 期刊论文

  • 发表日期：

    2026年2月5日

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  • Qiu-Yu Li,
  • Zi-Jian Su,
  • Ke Ma,
  • Yuan-Bo Zhang,
  • Xiao-Guang Bai,
  • Guo-Wei Fu,
  • Tao Jiang

摘要

High-sulfur iron concentrates emit SO2 into the flue gas during pellet induration. To investigate the effect of the SO2 cycle on pellet quality in the grate-kiln process, sulfur balance analysis, thermodynamic calculations, and pellet production experiments under simulated flue gas circulation conditions were conducted. The results indicated that SO2 circulation inhibited desulfurization and deteriorated pellet strength. SO2 absorption increased the pellet sulfur content to 0.70 wt.% during the downdraft drying phase, and the absorption could be aggravated by the moisture. The desulfurization rate of the preheating process was also decreased to 16.67%, resulting from the refractory sulfate generation. Sulfur content of the roasted pellets dropped to 0.13 wt.% because of the aluminosilicate generation. The finished pellet sulfur content further decreased to 0.08 wt.% due to the fresh air during the cooling process. Eventually, optimization measures were proposed when high-sulfur iron concentrates were used for oxidized pellet preparation.