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<p>The growing accumulation of KR desulfurization slag, a high-basicity, iron-rich by-product of hot metal pretreatment, poses environmental and resource challenges for the steel industry. This study systematically explores its recycling potential in sintering, using XRF, XRD, SEM–EDS, and sintering pot tests at blending ratios from 0.8% to 2.5%. Results show that 0.8–2.0% KR slag improves mixture granulation and increases the 10–40&#xa0;mm sinter fraction. At 2.0% blending, yield rises by 5.35%, tumble index by 2.8%, and fuel consumption drops by 9.8&#xa0;kg/t, while calcium ferrite reaches 37%. However, SO<sub>2</sub> emissions increase, with residual sulfur content rising to 0.15&#xa0;wt.%. The findings clarify sulfur migration and phase regulation, suggesting KR slag as a sustainable sintering additive if blending is controlled to limit emissions.</p>

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Effect of KR Desulfurization Slag Addition on Sinter Quality and Sulfur Migration

  • 期刊论文

  • 发表日期：

    2026年3月7日

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  • Yujie Liu,
  • Xinggan Zhang,
  • Yunjin Xia,
  • Dingdong Fan,
  • Aijun Deng

摘要

The growing accumulation of KR desulfurization slag, a high-basicity, iron-rich by-product of hot metal pretreatment, poses environmental and resource challenges for the steel industry. This study systematically explores its recycling potential in sintering, using XRF, XRD, SEM–EDS, and sintering pot tests at blending ratios from 0.8% to 2.5%. Results show that 0.8–2.0% KR slag improves mixture granulation and increases the 10–40 mm sinter fraction. At 2.0% blending, yield rises by 5.35%, tumble index by 2.8%, and fuel consumption drops by 9.8 kg/t, while calcium ferrite reaches 37%. However, SO2 emissions increase, with residual sulfur content rising to 0.15 wt.%. The findings clarify sulfur migration and phase regulation, suggesting KR slag as a sustainable sintering additive if blending is controlled to limit emissions.