Unformed refractory material composition

A monothilic refractory composition which comprises (1) a spinel material comprising a MgO-Al2O3 spinel phase and/or a MgO-Al2O3 spinel-corundam material comprising a MgO-Al2O3 spinel phase and a MgO-Al2O3 corundam phase, both materials containing 2 to 20 wt % of magnesia, in an amount of 20 to 70 wt %, (2) a magnesia material having a particle diameter of 0.3 mm or less and containing 55 to 85 wt % of particles having a particle size of 75 mum or less and having a magnesia content of 90 wt % or more in an amount of 3 to 12 wt %, (3) an alumina cement having a calcia content of less than 20 wt % in an amount of 3 to 10 wt %, (4) an ultra fine powder containing silica as a primary component in an amount of 0.3 to 1.5 wt %, and (5) an alumina material in the balanced amount. The monothilic refractory composition has high heat resistance and also exhibits improved resistance to corrosion and the permeation of slag. 一种未成形耐火材料混合物，包括：(1)20至70重量％有MgO-Al#-[2]O#-[3]尖晶石相的尖晶石料及或含MgO-Al#-[2]O#-[3]尖晶石相和MgO-Al#-[2]O#-[3]刚玉相的MgO-Al#-[2]O#-[3]尖晶石-刚玉料，这两种材料均含有2至20重量％镁土，(2)3至12重量％颗粒直径为0.3mm或更小并且含有55至85重量％粒子粒度为75mm或更小之颗粒的镁土料，而镁土的含量为90重量％或以上，(3)3至10重量％氧化钙含量小于20重量％的矾土水泥，(4)0.3至1.5重量％含有有作为主要成分之硅石的超细粉末，以及(5)平衡量的矾土料。此未成形耐火材料混合物具有高耐热性而且展现出改进的耐蚀性以及耐炉渣穿透性。