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首页> 外文期刊>Metallurgical and Materials Transactions B >Microscopic Study of Carbon Surfaces Interacting with High Carbon Ferromanganese Slag
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Microscopic Study of Carbon Surfaces Interacting with High Carbon Ferromanganese Slag

机译：碳表面与高碳铁锰渣相互作用的微观研究

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摘要

The interaction of carbon materials with molten slags occurs in many pyro-metallurgical processes. In the production of high carbon ferromanganese in submerged arc furnace, the carbothermic reduction of MnO-containing silicate slags yields the metal product. In order to study the interaction of carbon with MnO-containing slags, sessile drop wettability technique is employed in this study to reduce MnO from a molten slag drop by carbon substrates. The interfacial area on the carbon substrate before and after reaction with slag is studied by scanning electron microscope. It is indicated that no Mn metal particles are found at the interface through the reduction of the MnO slag. Moreover, the reduction of MnO occurs through the contribution of Boudouard reaction and it causes carbon consumption in particular active sites at the interface, which generate carbon degradation and open pore growth at the interface. It is shown that the slag is fragmented to many micro-droplets at the reaction interface, potentially due to the effect on the interfacial energies of a provisional liquid Mn thin film. The rapid reduction of these slag micro-droplets affects the carbon surface with making deep micro-pores. A mechanism for the formation of slag micro-droplets is proposed, which is based on the formation of provisional micro thin films of liquid Mn at the interface.
机译：碳材料与熔渣的相互作用发生在许多火法冶金过程中。在埋弧炉中生产高碳锰铁时，碳热还原含MnO的硅酸盐炉渣可得到金属产品。为了研究碳与含MnO的炉渣之间的相互作用，本研究采用无滴液滴润湿技术，以减少碳基质从熔融炉渣滴中还原MnO。通过扫描电子显微镜研究了与炉渣反应之前和之后碳基材上的界面面积。结果表明，通过还原MnO渣，在界面上未发现Mn金属颗粒。此外，MnO的还原是通过Boudouard反应的作用而发生的，它会导致界面处特定的活性位点处的碳消耗，从而在界面处产生碳降解和开孔生长。结果表明，可能是由于对临时液态Mn薄膜界面能的影响，炉渣在反应界面处破碎成许多微滴。这些炉渣微滴的快速减少会影响碳表面，并产生深的微孔。提出了一种形成渣微滴的机制，该机制是基于在界面处形成液态Mn的临时微薄膜。

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