氧化性气氛下MgO含量对富镁复合铁酸钙生成的影响

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英文篇名：Effects of MgO on the formation of Mg-rich Silico-Ferrite of Calcium and Aluminum(SFCA)under oxidizing atmosphere 作者：马保良 ; 张玉柱 ; 杨锦涛 ; 胡长庆 英文作者：Ma Baoliang;Zhang Yuzhu;Yang Jintao;Hu Changqing;School of Metallurgy,Northeastern University;Xingtai Iron and Steel Co.,Ltd.;School of Metallurgy and Energy,North China University of Science and Technology; 关键词：富镁复合铁酸钙 ; MgO ; CaO-SiO_2-Fe_2O_3-MgO-Al_2O_3体系 ; 机理 英文关键词：Mg-rich SFCA;;MgO;;CaO-SiO_2-Fe_2O_3-MgO-Al_2O_3;;system 中文刊名：SJQT 英文刊名：Sintering and Pelletizing 机构：东北大学冶金学院;邢台钢铁有限责任公司;华北理工大学冶金与能源学院; 出版日期：2019-02-15 出版单位：烧结球团 年：2019 期：v.44 基金：河北省科技计划项目(17217691D) 语种：中文; 页：SJQT201901001 页数：5 CN：01 ISSN：43-1133/TF 分类号：5-9

摘要

为阐释MgO含量对CaO-SiO_2-Fe_2O_3-MgO-Al_2O_3体系富镁复合铁酸钙(以下简称SFCAM)生成的影响机制,利用XRD、SEM、EDS等方法分析了950～1 250℃条件下获得的CaO-SiO_2-Fe_2O_3-MgO-Al_2O_3体系(MgO含量为1.3%～3.9%)的物相组成、微观形貌等。结果表明:SFCAM开始生成温度区间为1 000～1 050℃,大量生成温度区间为1 150～1 200℃;当温度高于1 200℃时,SFCAM开始分解。确定当温度大于1 100℃,低MgO含量时,MgO主要以MgFe_2O_4、Ca_2Mg(Si_2O_7)(以下简称CMS)形式与铁铝酸钙(以下简称CFA)等反应生成SFCAM;高MgO含量时,MgO主要以CMS形式与CFA等反应生成SFCAM。
        In order to elucidate the mechanism of effect of MgO content on the formation of magnesium rich composite calcium ferrite(hereinafter referred as SFCAM) in CaO-SiO_2-Fe_2O_3-MgO-Al_2O_3 system, the phase composition and micromorphology of the CaO-SiO_2-Fe_2O_3-MgO-Al_2O_3 system(with MgO content of 1.3%～3.9%) at temperature of 950～1 250 ℃ are studied by the methods of XRD, SEM and EDS. The results show that, the initial formation temperature range of Mg-rich SFCA is 1 000～1 050 ℃, and the temperature range of large amount of Mg-rich SFCA formation is 1 150～1 200 ℃; and when the temperature is higher than 1 200 ℃, the SFCAM begins to decompose. It is determined that when the temperature is higher than 1 100 ℃ and the content of MgO is low, MgO reacts with calcium ferric aluminate(hereinafter referred as CFA) and forms Mg-rich SFCA mainly in the form of MgFe_2O_4 and Ca_2Mg(Si_2O_7)(hereinafter referred as CMS). When the content of MgO is high, MgO reacts with CFA and forms SFCA mainly in the form of CMS.

引文

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