铝铬渣对用后镁铬砖制备镁铬浇注料性能的影响

Influence of Corundum-chrome Slag on the Property of Magnesite-chrome Castable Prepared with Used Magnesite-chrome Brick

为实现用后镁铬砖的综合利用,本文以用后镁铬砖回收料为主要原料制备镁铬质耐火浇注料,研究了铁合金厂铝铬渣对用后镁铬砖制备镁铬质耐火浇注料体积密度、显气孔率、常温耐压强度、热震稳定性及抗渣性的影响。结果表明:铝铬渣对用后镁铬砖制备镁铬浇注料具有一定的促烧结作用,随着铝铬渣加入量增加,烧后试样常温耐压强度增大。随着浇注料结构中原位尖晶石量增加,试样显气孔率增大,体积密度减小。当铝铬渣加入量为10%时,试样的热震稳定性最好,热震前后试样的常温耐压强度保持率为93.8%,试样具有较好抗渣侵蚀性能,侵蚀层结构稳定均匀。

Based on the comprehensive utilization of used magnesite-chrome brick, magensite-chrome castable were prepared with magnesite-chrome brick. Influence of corundum-chrome slag on the property of magnesite-chrome castable was researched. Bulk density, apparent porosity, cold crushing strength, thermal shock resistance and slag resistance of the magensite-chrome castable were estimated. The experimental resuh show that sintering performacne of magnesite-chrome castable was promoted by adding corundum-chrome slag. The cold crushing strength of castable specimens will increase with corundum- chrome slag addition. Apparent porosity of castable specimens will increase, and bulk density will decrease with spinel synthesized by situ reaction in the magnesite-chrome castable. The thermal shock resistance of magnesite-chrome castable was the best of all specimens when the corundum-chrome slag addition was 10%, the maintaining rate of cold crushing strength before and after thermal shock was 93. 8%. The slag resistance of magnesite-chrome castalble specimen was attributed to the stable and uniform structure of erosion layer.