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首页> 外文期刊>ISIJ international >Shrinkage Distribution of Sintering Bed Evaluated by X-ray CT Observation
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Shrinkage Distribution of Sintering Bed Evaluated by X-ray CT Observation

机译：X射线CT观察评价烧结床收缩率

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摘要

Increasing sinter productivity, product yield, and sinter strength are important for more efficient processes. Because the sintering bed structure should strongly affect such sintering performances, evaluation techniques and controlling methods have been studied. X-ray computed tomography (CT) was used in several studies, because a sintering bed can be observed without destroying it. Sintering bed shrinkage has been also focused on as an index of product yield or sinter strength, because shrinkage should indicate structural change of the sintering bed. However, shrinkage was only evaluated as a cumulative value at the end of sintering, and material behaviour in the sintering bed has not been clarified. In this study, the correlation of shrinkage and sintering bed structure by X-ray CT observation was investigated. Tracers were located in the sintering bed, and the vertical shrinkage distribution was derived from their height change. The result was compared with the shrinkage change with time. Several factors for shrinkage were considered, and their influence degree was discussed. The main factor was sintering with melt formation. This result, however, contradicted the positive effect of 'stand', which prevents shrinkage and improves productivity and product yield. The reason is discussed, focusing on the support effect of the stand and difference in shrinkage distribution in the sintering bed. A quench test at a certain time during sintering was also carried out, and the transition state from granule to sinter was evaluated.
机译：烧结矿生产率，产品产量和烧结矿强度的提高对于更有效的工艺至关重要。由于烧结床结构应强烈影响这种烧结性能，因此已经研究了评价技术和控制方法。 X射线计算机断层扫描（CT）被用于多项研究中，因为可以观察到烧结床而不会破坏它。烧结床的收缩也已被关注为产品产率或烧结强度的指标，因为收缩应表明烧结床的结构变化。然而，收缩率仅在烧结结束时作为累积值来评估，并且在烧结床中的材料性能还不清楚。在这项研究中，通过X射线CT观察研究了收缩率与烧结床结构的相关性。示踪剂位于烧结床中，垂直收缩分布由其高度变化得出。将结果与收缩率随时间的变化进行比较。考虑了收缩的几个因素，并讨论了它们的影响程度。主要因素是烧结与熔体形成。但是，该结果与“支架”的积极作用相抵触，后者可以防止收缩并提高生产率和产品产量。讨论原因，着重于机架的支撑效果和烧结床中收缩率分布的差异。还进行了烧结过程中一定时间的淬火试验，并评估了从颗粒到烧结的过渡状态。

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