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研究了不同碱度、不同SiO2与Al2O3含量条件下MgO对铁酸钙生成的影响以及Fe2O3-SiO2-CaO-Al2O3-MgO系内烧结矿的成矿过程,通过模拟高碱度烧结矿配料在空气气氛、1 220℃准化学平衡条件下进行烧结实验,利用XRD-QAMS法进行矿物定量、显微镜下观察矿相结构等方法进行分析。实验结果表明:R=2.0、不含Al2O3时增加MgO含量铁酸钙生成量明显增多,加入质量分数为2.5%的Al2O3后,MgO促进铁酸钙生成的作用减弱,Al2O3改变了MgO对铁酸钙生成的影响规律;随着碱度从1.8增加到2.3,铁酸钙生成量呈上升趋势,但是MgO对铁酸钙生成的促进作用减弱;实验还发现,随着MgO含量增加,不含Al2O3时铁酸钙晶形有“柱状”向“针状”变化趋势;加入质量分数为2.5%的Al2O3后,MgO含量增加对铁酸钙晶形影响减小。
The effect of MgO on the formation of calcium ferrite under different Alkalinity and different SiO2 and Al2O3 contents and the metallogenic process of the sinter in the Fe2O3-SiO2-CaO-Al2O3-MgO system were studied. Atmosphere, sintering at 220 ℃ under the quasi-chemical equilibrium conditions, the use of XRD-QAMS method for quantitative determination of minerals, microscopic observation of the mineral structure and other methods for analysis. The experimental results show that when R = 2.0, the content of calcium oxide increases when the content of MgO increases without Al 2 O 3, and the effect of MgO on calcium ferrite production decreases with the addition of 2.5% The effect of MgO on the formation of calcium ferrate was weakened as the alkalinity increased from 1.8 to 2.3. However, the effect of MgO on the formation of calcium ferrate decreased. The experiment also found that with the increase of MgO content, The shape of calcium ferrate changed from “columnar” to “acicular”, while the addition of MgO 2.5% had less effect on the shape of calcium ferrite.