Al_2O_3对烧结矿RDI的影响规律

Influence of Al 2O 3 on RDI of Sinter

采用断裂韧性的方法并结合电子显微分析技术，研究了Ａｌ２Ｏ３对烧结矿的低温还原粉化率（ＲＤＩ）的影响规律。研究结果表明：Ａｌ２Ｏ３主要分布在烧结矿的玻璃相中，并以硅铝酸铁和硅铝酸钙的形式存在；烧结矿中Ａｌ２Ｏ３的增加导致玻璃相的断裂韧性降低。作者认为，玻璃相断裂韧性的降低是引起烧结矿的ＲＤＩ增大的主要原因，并确定了烧结矿综合断裂韧性与ＲＤＩ良好的对应关系。

Fracture toughness method combined with electron microscopy was adopted to investigate the influence of Al 2O 3 on RDI of sinter. The results indicate that Al 2O 3 is mainly in the glass phase of sinter in the forms of ferrum silico aluminate and calcium silico aluminate, which results in the decrease of the fracture toughness for glass phase. It is the decrease of the fracture toughness for glass phase that causes the increase of RDI of sinter. The relation between the composite fracture toughness and RDI of sinter is determined.