CaO-SiO_2-MgO-Al_2O_3系精炼渣的活度计算模型

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英文篇名：The activity calculation model for a refining slag system of CaO-SiO_2-MgO-Al_2O_3 作者：于哲 ; 刘承军 英文作者：YU Zhe;LIU Chengjun;Key Laboratory for Ecological Metallurgy of Multimetallic Ores (Ministry of Education), Northeastern University;School of Metallurgy, Northeastern University; 关键词：熔渣 ; 分子离子共存理论 ; 活度模型 ; MgO 英文关键词：slag;;the coexistence theory of molecule and ion;;activity calculation model;;MgO 中文刊名：JXYE 英文刊名：Jiangxi Metallurgy 机构：东北大学多金属共生矿生态化冶金教育部重点实验室;东北大学冶金学院; 出版日期：2019-02-15 出版单位：江西冶金 年：2019 期：v.39;No.224 基金：国家重点研发计划资助项目(2017YFC0805100);; 国家自然科学基金资助项目(51674069,51874082) 语种：中文; 页：JXYE201901002 页数：5 CN：01 ISSN：36-1105/TF 分类号：8-12

摘要

精炼渣系对钢中夹杂物的演变与去除有着重要影响,渣金反应导致铝脱氧钢中大量形成MgO-Al_2O_3夹杂物,危害钢材的表面质量与疲劳性能.为了降低渣中MgO的反应性,文中依据分子离子共存理论,建立了CaO-SiO_2-MgO-Al_2O_3系精炼渣的活度计算模型,利用该模型,计算分析了渣中MgO含量、SiO_2含量、CaO/Al_2O_3和CaO/SiO_2对渣中MgO活度的影响规律.结果表明,增加Si O2含量可显著降低MgO活度.当MgO含量为10%时,控制CaO/Al_2O_3小于1和CaO/SiO_2小于0.6可有效降低MgO活度.
        Refining slag has an important influence on the evolution and removal of inclusions in steel. A large amount of MgO-Al_2O_3 inclusions are formed in the aluminum deoxidized steel due to slag-steel reaction, which results in deteriorating the surface quality and fatigue properties of the steel. In order to reduce the reactivity of MgO in slag, the activity calculation model of CaO-SiO_2-Mg O-Al_2O_3 refining slag is established on the basis of the coexistence theory of molecule and ion. The model is applied in the calculation and analyzation of the effects of MgO content, SiO_2 content, CaO/Al_2O_3 and CaO/SiO_2 on MgO activity in slag at 1600 ℃. The results show that the MgO activity is significantly reduced with the increasement of SiO_2. When the MgO content is 10 %, the effective reduction of MgO activity can be realized with the controlled contents of CaO/Al_2O_3 and CaO/SiO_2 are less than 1 and 0.6 respectively.

引文

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