用后Al2O3-SiC-C砖的回收再利用

摘要

对铁水包和混铁车用后的Al2O3-SiC-C(简称ASC)砖进行再生处理,然后以高铝矾土熟料、电熔刚玉、叶蜡石、SiC粉和鳞片石墨为原料,分别掺加质量分数为10％、20％、30％的Al2O3-SiC-C再生料制备了铁水包用和混铁车用再生Al2O3-SiC-C砖.与原砖相比,再生砖的体积密度和常温耐压强度较高,显气孔率较低,而高温抗折强度、抗氧化性、抗渣性与原砖的差距不大.过多添加ASC再生料对再生Al2O3-SiC-C砖的高温抗折强度和抗渣侵蚀性能不利,以统料形式添加时,混铁车用Al2O3-SiC-C衬砖中ASC再生料的添加量(w)不宜超过30％.%Recycled AI2O3-SiC-C bricks for iron ladle and torpedo ladle were prepared using high alumina bauxite clinker,fused corundum,pyrauxite,SiC powder and flake graphite as starting materials,adding 10%,20% and 30% (mass percent) of recycled materials made from used AI2O3-SiC-C bricks,respectively. Compared with the original bricks,the recycled bricks have high bulk density and cold crushing strength,low apparent porosity,but similar hot modulus of rupture,oxidation resistance and slag corrosion resistance. The excessive recycled AI2O3-SiC-C material is harmful to hot modulus of rupture and slag corrosion resistance of the recycled bricks,and its proper addition in working lining bricks of torpedo ladle should not exceed 30%.