转炉渣中MgO的饱和溶解度分析与研究

Analysis and Research of Saturated Solubility of MgO in the Converter Slag

本文分析转炉镁碳砖熔损机理可知影响镁碳砖熔损主要因素之一为炉渣与方镁石之间的固溶反应；通过分析影响转炉渣中MgO的饱和溶解度因素，分析表明：钢水温度、炉渣碱度和渣中FeO为其主要影响因素，炉渣中MgO的饱和溶解度随温度增加而增加，MgO的饱和溶解度随碱度增加而增加；在酸性渣中，MgO的溶解度随着FeO含量的增加而降低，并且碱度越小，MgO的溶解度受渣中FeO的影响越大；在高碱度渣中，FeO含量对MgO溶解度几乎没有什么影响。根据分析湛钢现场数据与理论研究可知，为了提高转炉炉衬的使用寿命，转炉渣中MgO含量需要达到8％～12％之间，转炉冶炼前期渣中FeO尽量控制高些，炉渣碱度控制在3～4之间，钢水温度在满足冶炼钢种要求下尽可能低。

This article analyzed the mechanism of converter magnesia-carbon brick damage. Results show that one of the main factors of magnesia-carbon brick damage was the solid state reaction between the slag. This article also studied the saturated solubility of MgO in the converter slag. The study show that molten steel temperature, slag basicity and the content FeO in the slag was main influencing factors. The saturated solubility of MgO in the slag increased with molten steel temperature and slag basicity. In acidic slag, MgO solubility with increasing FeO content in the slag decreased and MgO solubility was ex- tremely affected by slag FeO when the slag basicity was smaller. In the high basicity slag, the content of FeO is almost no impact on the MgO solubility. According to the analysis of field data and theoretical study of Zhanjiang Iron ＆ Steel, in order to improve the service life of converter lining, the content of MgO in the converter slag needed to be reached between 8% - 12%, and the content of FeO need to be higher and slag basicity was controlled between 3 - 4, the temperature of the molten steel to meet the requirements was controlled as low as possible.