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首页> 外文期刊>ISIJ international >Influence of H2–H2O Content on the Reduction of Acid Iron Ore Pellets in a CO–CO2–N2 Reducing Atmosphere
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Influence of H2–H2O Content on the Reduction of Acid Iron Ore Pellets in a CO–CO2–N2 Reducing Atmosphere

机译：H 2 -H 2 O含量对CO-CO -n 2中酸铁矿粒料还原的影响减少气氛

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Using hydrogen as a reducing agent for iron production has been the focus of several studies due to its environmental potential. The aim of this work is to study the influence of H_(2)–H_(2)O content in the gas phase on the reduction of acid iron ore pellets under simulated blast furnace conditions. Temperature and gas compositions for the experiments were determined with multi-point vertical probes in an industrial blast furnace. The results of the reduction tests show that higher temperatures and H_(2) content increase the rate and extent of reduction. For all the gas and temperature combinations, morphological, mineralogical, and microstructure changes were observed using different characterization techniques. Microscopy images reveal that H_(2)–H_(2)O, in the gas phase, has a positive influence on reduction, with metallic iron forming at the pellet’s periphery and core at lower temperatures compared to CO–CO_(2)–N_(2) reducing gas. Porosity and surface area changes were determined using a gas pycnometer and the BET method. The results indicate that increasing the reduction temperatures and H_(2) content results in greater porosity and a larger surface area. Moreover, carbon deposition did not take place, even at lower temperatures. A rate minimum was detected for pellets reduced at 800°C, probably due to metallic iron formation, hindering the diffusion of reducing gases through the product iron layer.
机译：使用氢气作为铁生产的还原剂是由于其环境潜力的几项研究的重点。本作作品的目的是研究H_（2）-H_（2）o含量在气相中的影响在模拟高炉条件下的酸铁矿颗粒中的减少。用工业高炉中的多点垂直探针测定实验的温度和气体组合物。减少试验的结果表明，较高的温度和H_（2）含量增加了减少的速率和程度。对于所有的气体和温度组合，使用不同的表征技术观察到形态学，矿物学和微观结构变化。显微镜图像显示，在气相中的H_（2）-H_（2）O具有积极的减少影响，在颗粒的周边和核心在较低温度下形成金属铁与CO-CO_（2）-N_相比（2）降低气体。使用气体Pycnometer和BET方法测定孔隙率和表面积改变。结果表明，增加还原温度和H_（2）含量导致更大的孔隙率和较大的表面积。此外，即使在较低的温度下，也没有发生碳沉积。对于800℃降低的颗粒，可能是由于金属铁形成，阻碍了降低气体通过产品铁层的扩散，因此检测到速率最小。

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