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<p>In pursuit of carbon peaking and carbon neutrality goals, conventional sintering processes face significant transformation challenges owing to their high energy consumption and carbon emissions. Embodying the concept of carbon-free sintering, gas-based sintering technology replaces coke breeze with clean gaseous fuels (e.g., natural gas, hydrogen-rich gas) and restructures the heating system, presenting itself as a critical pathway for low-carbon transition in the iron and steel industry. This study first investigated the influence of oxygen content on the high-temperature sintering characteristics of iron ore fines through micro-sintering experiments. Subsequently, key operating parameters, including charging mode, bed thickness, and heating schedule, were optimized using a dedicated gas-based sintering pot system. The experimental results revealed that increased oxygen content significantly improved the high-temperature sintering characteristics. Compared with conventional sinter, the gas-based sinter exhibited substantial improvements in quality: the sinter yield increased from 77.81 to 85.21%, accompanied by an increase in the tumbler index from 62.10 to 72.76% and an improvement in the reduction degradation index (RDI) from 59.38 to 66.31%. Moreover, significant reductions in sinter off-gas emissions were achieved: CO<sub>2</sub> peak concentration decreased from 10% to approximately 2.5%, CO peak concentration decreased from 12,500 ppm to below 3000 ppm, NO<sub><i>x</i></sub> peak concentration decreased from 250 to 28 ppm, and SO<sub>2</sub> peak concentration decreased from 88 to 25 ppm. These results demonstrate that the gas-based sintering technology offers significant synergistic benefits in reducing both pollution and carbon emissions, holding considerable promise for industrial-scale implementation.</p> Graphical Abstract <p></p>

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Application of All-Gas Fuel Heating in Iron Ore Sintering: Optimization of Gas-Based Sintering Process

  • 期刊论文

  • 发表日期：

    2026年5月8日

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  • Xiangbo Jiang,
  • Tiejun Chen,
  • Xianlin Zhou,
  • Junying Wan,
  • Yanhong Luo,
  • Pinjing Ren,
  • Jiawen Liu

摘要

In pursuit of carbon peaking and carbon neutrality goals, conventional sintering processes face significant transformation challenges owing to their high energy consumption and carbon emissions. Embodying the concept of carbon-free sintering, gas-based sintering technology replaces coke breeze with clean gaseous fuels (e.g., natural gas, hydrogen-rich gas) and restructures the heating system, presenting itself as a critical pathway for low-carbon transition in the iron and steel industry. This study first investigated the influence of oxygen content on the high-temperature sintering characteristics of iron ore fines through micro-sintering experiments. Subsequently, key operating parameters, including charging mode, bed thickness, and heating schedule, were optimized using a dedicated gas-based sintering pot system. The experimental results revealed that increased oxygen content significantly improved the high-temperature sintering characteristics. Compared with conventional sinter, the gas-based sinter exhibited substantial improvements in quality: the sinter yield increased from 77.81 to 85.21%, accompanied by an increase in the tumbler index from 62.10 to 72.76% and an improvement in the reduction degradation index (RDI) from 59.38 to 66.31%. Moreover, significant reductions in sinter off-gas emissions were achieved: CO2 peak concentration decreased from 10% to approximately 2.5%, CO peak concentration decreased from 12,500 ppm to below 3000 ppm, NOx peak concentration decreased from 250 to 28 ppm, and SO2 peak concentration decreased from 88 to 25 ppm. These results demonstrate that the gas-based sintering technology offers significant synergistic benefits in reducing both pollution and carbon emissions, holding considerable promise for industrial-scale implementation.

Graphical Abstract