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Effect of Reducing Gas on the Volume Change during Reduction of Iron Oxide Compacts

机译：还原气体对氧化铁粉体还原过程中体积变化的影响

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摘要

Iron oxide compacts fired at 1 373 K for one hour were reduced at 973-1 373 K using different reducing gases; namely CO, H_2, 50%H_2-CO and simulated reformed natural gas. The reduction course has been followed up by means of recording weight-loss changes as a function of time. The structure of the compacts was examined by reflected light microscope whereas the volume change was measured by displacement method. It has been found that both temperature and reducing gas composition have a significant effect on the volume change behaviour during reduction. The volume change values of the completely reduced compacts were not well representing the volume change behaviour during reduction. The greater swelling was observed for compacts reduced with pure CO giving a maximum value of 224% for compacts reduced up to 90% reduction at 1 173 K. Reduction with pure H_2 showed a maximum contraction of 24% for compacts completely reduced at 1 123 K. The volume change behaviour for compacts reduced with gas mixtures was mainly dependant on the relative contents of CO and H_2 in the reducing gas. Mechanisms have been proposed for the volume change trends for compacts reduced with the different gases and correlated with the microstructure of the reduced compacts.
机译：在1373 K下燃烧一小时的氧化铁压块在973-1 373 K下使用不同的还原气体还原。 CO，H_2、50％H_2-CO和模拟重整天然气。通过记录减肥随时间的变化来跟踪减肥过程。通过反射光显微镜检查压块的结构，而通过位移法测量体积变化。已经发现，温度和还原性气体组成都对还原期间的体积变化行为具有显着影响。完全还原的坯块的体积变化值不能很好地代表还原过程中的体积变化行为。对于纯CO还原的压块，观察到更大的溶胀，在1 173 K时压制的压块最大值达到224％。在1 123 K完全压制的压实H_2的还原显示最大收缩率为24％用混合气体还原的压块的体积变化行为主要取决于还原气体中CO和H_2的相对含量。已经提出了用于因不同气体而还原的压块的体积变化趋势的机制，并且该机制与还原的压块的微观结构相关。

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