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通过添加Fe2O3微粉的方法,研究了Fe2O3微粉对MgO-CaO系耐火材料烧结性能和抗水化性能的影响。试验结果表明,添加Fe2O3微粉可以有效地促进MgO-CaO系耐火材料的烧结,抑制其水化速度。当Fe2O3的添加量在0～3%时,随着Fe2O3添加量的增加,耐火材料试样的体积密度先增加后减小,显气孔率则先减小后增加,且两者均在Fe2O3为1%处出现极值。当Fe2O3的添加量在0.2%～0.5%的范围时,耐火材料试样的显气孔率和体积密度变化最明显。当Fe2O3添加量为1%时,将试样在温度为60℃、相对湿度为75%的条件下水化144 h后,其粉化率仅为1.46%。
The effect of Fe2O3 powder on sintering performance and hydration resistance of MgO-CaO refractory was studied by adding Fe2O3 powder. The experimental results show that the addition of Fe2O3 powder can effectively promote the sintering of MgO-CaO refractory and inhibit its hydration rate. When the amount of Fe2O3 is 0-3%, the bulk density of refractory samples first increases and then decreases with the increase of Fe2O3 addition, while the apparent porosity decreases first and then increases, 1% at the extreme. When Fe2O3 is added in the range of 0.2% ~ 0.5%, the apparent porosity and bulk density of the refractory samples are the most obvious. When the amount of Fe2O3 is 1%, the sample is hydrated for 144 h at a temperature of 60 ℃ and a relative humidity of 75%, and its powdering rate is only 1.46%.