The Importance of Controlling the Chemistry of Pre-Oxidized Chromite Pellets for Submerged Arc Furnace FeCr Smelting: a Study on Furnace Si Control

M. Erwee, S. Swanepoel, Q. Reynolds
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引用次数: 3

Abstract

South African FeCr operations have over time moved to running furnaces on predominantly pelletized concentrate feeds. This has brought about several changes in how submerged arc FeCr furnaces are operated. In particular, raw material management has become a critical factor to ensure that maximum value is derived from the material, and to minimize the impact of process upsets when they occur. When pre-oxidized pellets are produced, variations in the SiO2 fraction of the pellets will influence the liquidus temperature of the pellet material. Lower liquidus temperatures are undesirable when smelting pellets, since this can lead to impaired pre-reduction of iron oxides in the upper parts of the furnace. Further to this, if for example the furnace electrodes are positioned incorrectly, an excess amount of heat may be generated in the upper parts of the furnace – this can lead to excessive reduction of SiO2 to Si, which in turn reports to the FeCr product as a contaminant. In this paper, the effect of the chemistry of the pellet, electrode control and slag chemistry is studied. It was found that no one factor can fully explain the Si content of the alloy, however, with more modern tools, the industry is one step closer to fully predictive control. Some practical aspects of ensuring that the alloy Si specification is met.
埋弧炉铁熔炼预氧化铁球团化学控制的重要性——炉内硅控制研究
随着时间的推移,南非的铁精矿业务已经转向以颗粒浓缩饲料为主的高炉。这给埋弧铁铁炉的操作方式带来了一些变化。特别是,原材料管理已成为确保从材料中获得最大价值的关键因素,并在发生过程中断时将其影响降至最低。当生产预氧化球团时,球团中SiO2分数的变化将影响球团材料的液相温度。当熔炼球团时,较低的液相温度是不希望的,因为这可能导致炉子上部氧化铁的预还原受损。此外,例如,如果炉电极位置不正确,则可能在炉的上部产生过量的热量-这可能导致SiO2过度还原为Si,从而将FeCr产品报告为污染物。本文研究了球团化学、电极控制和炉渣化学的影响。人们发现,没有一个因素可以完全解释合金的Si含量,然而,随着更现代的工具,该行业离完全预测控制更近了一步。确保合金Si规格符合的一些实际方面。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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