钢包工作衬用无碳预制块的研制与应用

Development and Application of Carbon-Free Precast Block for Ladle Lining

以高铝刚玉为骨料,电熔镁砂、氧化铝微粉和氧化硅微粉为基质料,研制了钢包工作衬用无碳预制块·结果表明:MgO与Al2O3反应形成尖晶石伴随的体积膨胀效应使预制块获得了较小的烧后线收缩率·与传统的Al2O3-MgO-C砖相比,由氧化物微粉结合的预制块具有较低的显气孔率,较高的高温抗折强度和良好的抗渣性·现场实际应用结果表明,用预制块砌筑的钢包工作衬具有较好的保温效果,能够有效地减小精炼过程中钢水的温降,并可以有效地防止钢水增碳,有利于低碳钢和超低碳钢的生产·

A carbon free precast block was developed by using fused high-Al corundum as aggregate and electro-melting magnesia and ultra fine Al2O3 and SiO2 powders as matrix materials, A small linear shrinkage of the precast block was found through the volume expansion due to the spinel which was produced from the reaction of MgO with Al2O3 in matrix, The precast block shows lower apparent porosity and higher hot modulus of rupture and slag corrosion resistance in comparison to conventional Al2O3-MgO-C brick. Practical applications revealed that bonding the precast blocks together as ladle lining can provide better thermal insulation which will effectively reduce the temperature drop of molten steel in refining process and prevent molten steel from carburization. The carbon-free precast block is thus regarded as a new type of ladle lining material that is beneficial to the production of low-carbon and ultra-low-carbon steel.