电磁场对MgO-C耐火材料抗熔渣侵蚀性的影响

Effect of Electromagnetic Field on Melting Slag Resistance of MgO-C Refractories

采用碳含量为14%(质量分数)的MgO-C砖和CaO与SiO2的质量比为0.8的转炉渣,分别在中频感应炉和电阻炉中进行抗渣侵蚀实验。结果表明:感应炉环境中存在的电磁场使抗渣试样中出现明显的渗透层,MgO与渣中氧化铁形成的固溶体在温度降低时以镁铁尖晶石相存在,而低熔相主要为钙镁橄榄石和镁橄榄石。在无电磁场存在的电阻炉中,MgO脱落并熔解到熔渣中与Al2O3形成MgAl2O4,生成的低熔相主要为钙铝黄长石和钙镁黄长石。高温下存在的电磁场,使渣中Fe2+和Fe3+具有较高的扩散系数和渗透性,形成镁铁尖晶石,同时有少量的镁铝尖晶石生成。而无电磁场环境下,只生成镁铝尖晶石相。

The experiment of melting slag resistance of MgO-C refractories were carried out in an induction furnace and a resistance furnace,using MgO-C refractories containing 14% carbon（in mass） and converter slag.Mass ratio of CaO to SiO2 in converter slag is 0.8.The results show that the presence of electromagnetic field in the induction furnace produces an apparent penetration layer on the slag resistance samples.The solid solution,formed by the reaction of MgO and Fe2O3 in slag,is MgFe2O4 phase at a low tem-perature.The low melting phases are mainly monticellite（CaMgSiO4,CMS） and forsterite（Mg2SiO4,MS）.In the resistance furnace without any electromagnetic field,the scaling MgO dissolves into slag and reacts with Al2O3 to generate the MgAl2O4 phase.The low melting phases are gehlenite（Ca2Al2SiO7,C2A2S） and akermanite（Ca2MgSi2O7,C2MS2）.The electromagnetic field at a high tem-perature could enhance the diffusion and penetration of Fe2＋/3＋ ions to form the MgFe2O4 phase,and generate a small amount of MgAl2O4 spinel.Only MgAl2O4 phase can be produced in the absence of electromagnetic field.