成分对MgO-Al_2O_3-C耐火材料抗侵蚀性能的影响

除工作环境外,原料配比对MgO-Al2O3-C材料抗侵蚀性能具有重要影响.采用不同杂质含量的电熔镁砂原料,按照不同C含量和Al2O3含量制备MgO-Al2O3-C试样.通过转动试样浸渣方法测得不同试样在富CaO熔渣中的侵蚀速率,从而研究了成分对抗侵蚀性能的影响.结果表明抗侵蚀性能随着镁砂杂质含量的增加而迅速降低,随着碳含量以及Al2O3含量的增加而先增加后降低.过多的Al2O3导致了熔渣黏度下降,而过多的碳导致了空隙率增大.根据上述结果,在富CaO熔渣中MgO-Al2O3-C材料理想的Al2O3质量分数为10%~30%,理想的C质量分数为10%~20%.

Effects of Composition on Corrosion Resistance of MgO-Al2O3 -C Refractory

The proportion of raw materials has an important influence on corrosion resistance of MgO-Al2O3-C refractory besides working conditions. MgO-Al2O3-C samples were prepared with different type of fused magnesia and various amounts of Al2O3 and graphite. Their corrosion rates in CaO-rich slag were investigated by rotating the samples in the molten slag. The effect of composition on the corrosion resistance of MgO-Al2O3-C refractory was studied. The results showed that the corrosion resistance decreases as the magnesia’s impurity increases. And with the increase of Al2O3 and graphite content， the corrosion resistance increases firstly and then decreases. Excessive Al2O3 results in viscosity decrease of slag， and excessive graphite results in porosity increase. Thus， for MgO-Al2O3-C refractory that used under CaO-rich slag， the ideal Al2O3 content is 10%~30% and the graphite content is 10%~20%.