Fe2O3微粉添加对MgO CaO系耐火材料烧结性能及 抗水化性能的影响

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%。

Effect of Fe203 Addition on Properties of Sintering and Hydration Resistance of MgO-CaO Refractories

By adding fine Fe2O3 powder, the effect of the Fe2O3 addition on the properties of sintering and hydration resistance of MgO-CaO refractories was investigated. The results showed that the sintering property of the MgO- CaO refractories could be promoted dramatically, and the hydration of the MgO-CaO refractories could be inhibited. When increasing the Fe2O3 amount from 0 to 3%, the bulk density of the MgO-CaO refractories increased first and then decreased, the apparent porosity gained a sharp decrease and then increased by contraries. They both had extreme values when the Fe2O3 addition was 1%. The bulk density and apparent porosity changed obviously when the Fe2O3 addition was between 0.2% and 0.5 %. The chalked ratio of the MgO-CaO samples added with 1% Fe2O3 was only 1.46% when hydrated at 60℃ （relative moisture 75%） for 144 h.