w(MgO)/w(SiO_2)对转炉渣系微晶玻璃结构和性能的影响

Effects of w(MgO)/w(SiO_2) on Structure and Flexural Strength of Glass Ceramics Made from Converter Slag

为了减少转炉渣对环境的危害,提出利用熔融法制备了SiO2-CaO-MgO-Fe2O3系微晶玻璃.借助DTA,SEM和XRD等分析方法,系统探讨了w(MgO)/w(SiO2)比值对微晶玻璃的结构和弯曲强度的影响.结果表明:随着w(MgO)/w(SiO2)比值的增加,玻璃的转变温度和析晶峰温度变化较小,但微晶玻璃的物相组成发生较大变化,由普通辉石转变为透辉石,微晶玻璃内部的晶体尺寸逐渐减小,晶体分布相对均匀;微晶玻璃的弯曲强度逐渐增加.

To reduce the environmental hazard resulting from converter slag, the glass ceramics in SiO2-CaO-MgO-Fe2O3 system were prepared using the slag through melting process. The effect of the ratio w （MgO）/w （SiO2） on structure and flexural strength of the glass ceramics was investigated by DTA, SEM and XRD. The results showed that glass transition temperature and crystallization peak temperature of the ceramics changed little with the increasing value of the ratio,but its phase composition changed greatly, i. e., from augite to diopside with grain size gradually decreased and crystals uniformly distributed. Meanwhile the flexural strength of glass ceramics increased.