摘要
结合VOD与RH介绍了造成炉外精炼蚀损严重部位的原因。从MgO-Cr2O3、MgO-CaO、MgO-C、MgO-CaO-C、MgO-MgO·Al2O3等耐火材料性能及在精炼中的作用介绍了如何选择耐火材质;从接触角、熔渣粘度、形成高熔点化合物、气孔微细化以及炉渣成分控制、双饱和与精炼温度等方面介绍了提高炉外精炼用耐火材料寿命的途径。最后结合镁铬、镁钙、MgO-C、镁钙碳与无铬耐火材料介绍了炉外精炼用耐火材料的发展动向,并对MgAlON结合镁质耐火材料在炉外精炼中的研究与应用进行了评估与预期。
The ways of improving the lining life and the developing trends of the refractories for secondary refining vessels are examined,analyzed and described in combination with RH,VOD and AOD processes etc. In the first part ,the ways of improving the lining life of refractories are clarified from the results of our research work by means of the rotating cylinder method under forced convection ,the selection of reasonable refractories for refining different high-quality steel grades, such as ultra low carbon stainless steel, IF steel and ultra low sulphur steel etc,the cantact angle of liquid slag resting on refractories,the molten slag interacting with the refractories to form high melting point compound ,the change in viscosity before and after interac- tion of the slag with refractories,the newly developed brick with a homogeneous distribution of many small pores,the solubility limits of MgO,Al2O3 ,Cr2O3 ,MgO · Cr2O3 and MgO · Al2O3 in CaO -SiO2 slags at 1700℃;,the saturation lines for both MgO and CaO（or C3S,or C2S） and both MgO and spinel in the phase diagram of CaO -SiO2 -Al2O3 -MgO quarternary system,the effect of refining temperature on corrosion and to keep the vessel hot at off-time between heats. In the secondary part,the developing trends of the refractories used in secondary refining vessels are summarized and described in combination with magnesite - chrome,MgO -CaO, MgO - MgO · Al2O3 -3% Cr2O3, MgO - C, MgO - CaO - C, low carbon containing MgO - CaO and chrome - free bricks, such as MgO - CaO - ZrO2, MgO - MgO · Al2 O3 - TiO2, MgO - Y2 O3 etc. Finally,the prediction of MgAION bonded magnesite-base bricks applied to refining ultra low carbon steel is analyzed and estimated.
出处
《耐火材料》
EI
CAS
北大核心
2007年第1期1-12,共12页
Refractories
关键词
炉外精炼
VOD
RH
碱性耐火材料
Secondary refining vessels,VOD, RH, Basic refractories
