烧结混合料中SiO2和FeO含量对烧结矿强度的影响

Influence of SiO_2 and FeO Contents in Charge on Sinter Strength

采用烧结杯制备烧结试样，依据实验结果在水钢65m^2烧结机上进行工业试验；应用标准转鼓测试强度、光学显微镜和x射线衍射仪分析组织和相结构，研究了原料成分波动对烧结矿强度的影响。结果表明，SiO2含量对烧结矿强度有较大影响，SiO2的质量分数为5．37％～5．67％时，烧结矿强度较高；MgO和FeO含量对烧结矿强度也有一定影响，SiO2的质量分数为4．84％～5．00％时，降低烧结料中的MgO和FeO含量可促进烧结矿中铁酸钙的生成，改善其强度。

The influence of composition of charge on sinter strength was studied by means of tumbling test, optical microscopy and X-ray diffraction （XRD）. The samples were prepared with sintering cup, and the production trial was conducted on Shuigang 65 m^2 sintering machine based on the experimental results. It was shown that the SiO2 content has a major effect on the sinter strength. When the SiO2 content was 5.37-5.67%, the sinter had a higher strength. Both the MgO and FeO contents have some effect on the sinter strength. While the SiO2 content was 4.84- 5.00%, the calcium ferrite was formed by decreasing both w（MgO） and w（FeO） and the sinter strength was improved.