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为了探索复合铁酸钙的生成机制以优化烧结工艺,提高烧结矿质量,采用相平衡法研究了准化学平衡条件下Al_2O_3与MgO在烧结中的行为。结果表明,Al_2O_3和MgO的共同存在有利于复合铁酸钙(silico-ferrite of calcium and alminum,简称SFCA)的生成,但存在着交互作用,MgO促进赤铁矿分解生成磁铁矿,Al_2O_3的存在可抑制MgO的作用,减少磁铁矿生成,尤其在Al_2O_3质量分数较高时,MgO促进磁铁矿生成能力降低,促进SFCA生成作用增强。当MgO质量分数为2%时,添加质量分数2%的Al_2O_3矿相中磁铁矿质量分数快速降低,SFCA质量分数快速增加;随着Al_2O_3质量分数升高,SFCA晶面间距减小,晶体结构稳定性增强,有利于SFCA的生成;Al_2O_3质量分数超过3%后,孔洞结构增多,SFCA质量分数增加变缓,磁铁矿质量分数呈降低趋势,赤铁矿质量分数有升高趋势。
In order to explore the formation mechanism of composite calcium ferrite in order to optimize the sintering process and improve the sinter quality, the phase equilibrium method was used to study the behavior of Al 2 O 3 and MgO in sintering under quasi-chemical equilibrium conditions. The results show that the coexistence of Al 2 O 3 and MgO is beneficial to the formation of silico-ferrite of calcium and alminum (SFCA), but there is an interaction between MgO and hematite, which leads to the formation of magnetite and the presence of Al 2 O 3 Can inhibit the effect of MgO and reduce the generation of magnetite. Especially when the mass fraction of Al 2 O 3 is high, MgO can promote the reduction of magnetite formation ability and promote the formation of SFCA. When the content of MgO is 2%, the mass fraction of magnetite in Al 2 O 3 ore decreases rapidly and the mass fraction of SFCA increases rapidly. As the mass fraction of Al 2 O 3 increases, the spacing of SFCA decreases and the crystal structure When the content of Al 2 O 3 exceeds 3%, the pore structure increases, the SFCA mass fraction increases slowly, the magnetite mass fraction decreases and the hematite mass fraction increases.