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首页> 外文期刊>Metallurgical and Materials Transactions B >Formation of a Mineral Layer during Coke Dissolution into Liquid Iron and Its Influence on the Kinetics of Coke Dissolution Rate
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Formation of a Mineral Layer during Coke Dissolution into Liquid Iron and Its Influence on the Kinetics of Coke Dissolution Rate

机译：焦炭溶解在铁水中过程中矿物层的形成及其对焦炭溶解速率动力学的影响

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摘要

The formation and development of the mineral layer that forms between coke and liquid iron during carbon dissolution has been characterized. Coke particles (?2 mm, +0.5 mm) were added to the top surface of an iron 2 mass pct C melt at representative iron-making temperatures, for periods of time between 2 and 120 minutes, before being quenched. The quenched samples were then sectioned, and the solidified coke-melt interfacial region analyzed in the scanning electron microscope (SEM). Analysis showed that a mineral layer was present at the interface at all experimental temperatures (1450 °C to 1550 °C) from 2 minutes and persisted beyond 120 minutes. The mineral layer was found to be composed of calcium aluminate phases, with the proportions of these phases dictating its morphology. Further, changes observed in the rate of carbon dissolution from the coke were related to the composition and morphology of the mineral layer. The effect of this mineral layer on the rate of carbon dissolution has been interpreted as a change in the reaction control mechanism.
机译：已经表征了碳溶解过程中在焦炭和铁水之间形成的矿物层的形成和发展。在淬火之前，在代表性的炼铁温度下，将焦炭颗粒（？2 mm，+ 0.5 mm）添加到质量为2的铁C熔体的顶表面，时间为2至120分钟。然后将淬火的样品切成薄片，并在扫描电子显微镜（SEM）中分析固化的焦炭-熔体界面区域。分析表明，在2分钟的所有实验温度（1450°C至1550°C）下，界面处均存在矿物层，并持续超过120分钟。发现矿物层由铝酸钙相组成，这些相的比例决定了其形态。此外，观察到的从焦炭中溶解碳的速率的变化与矿物层的组成和形态有关。该矿物层对碳溶解速率的影响已被解释为反应控制机制的改变。

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