活性氧化铝、电熔镁砂对用后镁铬砖制备镁铬浇注料性能的影响

Influence of Active Alumina and Fused Magnesia on the Property of Magnesite-chrome Castable Prepared from Used Magnesite-chrome Brick

以用后镁铬砖回收料、镁铝尖晶石为主要原料,铝酸盐水泥为结合剂制备镁铬浇注料,研究了活性氧化铝和电熔镁砂用量对用后镁铬砖制备镁铬浇注料常温性能、热震稳定性及抗渣性的影响。结果表明,加入活性氧化铝和电熔镁砂均能不同程度提高镁铬浇注料热震稳定性和抗渣性。加入活性氧化铝有利于镁铬浇注料中形成原位尖晶石,活性氧化铝加入量为5%时,热震前后试样常温耐压强度保持率为90.8%,镁铬浇注料具有较好的抗渣侵蚀性能,侵蚀层结构稳定均匀。加入电熔镁砂有利于镁铬浇注料基质中形成方镁石/镁铝尖晶石复相结构,当电熔镁砂加入量为5%时,镁铬浇注料经1500℃烧后试样常温耐压强度最大,电熔镁砂加入量为10%时,浇注料抗渣侵蚀性最好。

Magensite-chrome castable were prepared from used magnesite-chrome brick. Influence of active alumina and fused magnesia on the property of magnesite-chrome castable was researched. Property at room temperature, thermal shock resistance and slag resistance of the magensitechrome castable were estimated. The experimental results showed that the thermal shock resistance and slag erosion resistance of magnesite-chrome castable could be improved by adding appropriate amount of active alumina and fused magnesia, the insitu spinel in the magnesia-chrome castable was generated by adding active alumina, when the active alumina addition was 5%, the maintaining rate of cold crushing strength before and after thermal shock was 90.8%, and the slag erosion resistance of magnesite-chrome castalble was good due to the stable and uniform structure of erosion layer. The composite structure ofpericalse/magnesisa alumina spinel was attributed to fused magnesia addition in the magnesia-chrome castable matrix. When the fused magnesia addition was 5%, the cold crushing strength of magneiste-chrome eastable calcined at 1500 ℃ was maxium, when the fused magnesia addition was 10%, the slag erosion resistance of magneiste-chrome castable was the best.