Thermodynamics calculation on the oxidation and sulfur removal abilities of slag in EAF dust pellet reduction process

来源期刊：中南大学学报(英文版)2001年第1期

论文作者：PENG Bing PENG Ji ZHANG Chuan-fu Jonathan Lobel Janusz A. Kozjnski

文章页码：64 - 68

Key words：thermodynamics calculation; slag; electric arc furnace; dust

Abstract: The valuable metals in the dust can be rechcled by mixing it with reducing agent carbon and lignosulfonate as the binder to make pellets, then returning the pellets to electric are furnace (EAF) and sdding ferro-silicon. Part of valuable metals in the dust is reduced by carbon and part of them reduced by ferro-silicon for the economical consideration. The resuced metals get into the steel in the stainless steel or special steel production. But the sulfur in the lignosulfonate may affect the quality of produced steel, which is dependent on the status of the smelting slag. The experiment were conducted in the way of changing the ratio of start iron, pellets, ferro-silicon and lime. The content of the slag was checked by XRF for the calculation themodynamics study. The active concentrations of materials in the slag, the slag abilities of oxidation and sulfur removal in EAF dust reduction process were determined by themodynamics calculation study on CaO-MgO-FeO-Fe₂O₃-SiO₂-S slag at 1550℃. The oxidation ability of slag can be expressed as N(FeO)+6N(Fe₂O₃)+8N(Fe₃O₄)。 The sulfur removal ability is dependent on the amount of added ferro-silicon and the basicity of the slag. The calculation thermodynamics model was set up and it could be applied to the practical production.