The used magnesia carbon brick for ladle was sorted ,trash separated ,crushed,and treated by separating particles to prepare recycled material The effects of addition and particle size of recycled material on property of magnesia carbon brick were studied, The results show that: ( 1 )the introduction of the recycled material can reduce the density.cold crushing strength ,hot modulus of rupture,and slag resistance to different extents;and the introduction of recycled material with padicle size ≤0.074 mm has the greatest influence;( 2 ) introducing recycled material with particle size of 5-3 mm has the smallest influence on density of the magnesia carbon brick;when introducing 1％ .the bulk density reduces by 0. 003 9 g· cm-3 and the apparent porosity increases by 0. 108 7 ％; ( 3 ) the recycled material with particle size of 3- 1 mm has the smallest effect on cold crushing strength and hot modulus of rupture;when introducing 1％ .the cold crushing strength reduces by 1.66 MPa and hot modulus of rupture reduces by 0. 11 MPa.%对钢包用后镁碳砖进行拣选、除杂、破碎、颗粒分离处理,制成回收料,研究回收料加入量和粒度对镁碳砖性能的影响.结果发现:(1)引入回收料均不同程度降低了镁碳砖的致密度、常温耐压强度、高温抗折强度和抗渣侵蚀性,以引入≤0.074 mm回收料对其各项性能降低程度影响最大.(2)引入5～3 mm回收料对镁碳砖致密度影响最小,平均引入1%质量分数的5～3 mm回收料,其体积密度降低0.003 9 g·cm-3,显气孔率增加0.108 7%.(3)引入3 ～1 mm 回收料对镁碳砖常温耐压强度和高温抗折强度影响最小,乎均引入1%质量分数的3 ～1 mm回收料,其常温耐压强度降低1.66 MPa,高温抗折强度降低0.11 MPa.
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