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本文采用光学显微镜,电子探针及穆斯堡尔效应等手段对MgO在烧结矿和球团矿中的赋存状态及其对冶金性能的影响进行了微观分析研究。 显微镜下观察表明,随烧结矿中MgO含量增加,赤铁矿及铁酸钙明显减少。当MgO约达4％以上时,烧结矿渣相中开始出现少量镁质硅酸盐矿物。 电子探针扫描分析表明,MgO主要分布于除赤铁矿之外的铁相矿物中,在烧结矿中形成含镁磁铁矿,在球团矿中形成镁铁矿,少部分分布于渣相中。 对杭钢球团矿所做的穆斯堡尔谱学研究表明,在焙烧过程中,Mg~(2+)大量进入磁铁矿八面体晶位,揭示了MgO在人造富矿中富集于铁相及引起物相变化的机理。 基于上述试验研究,分析了MgO对人造富矿冶金性能的影响。
In this paper, the microscopic analysis of the occurrence of MgO in sinter and pellet and its influence on the metallurgical properties were carried out by means of optical microscope, electron probe and Mossbauer effect. Microscopic observation showed that with the increase of MgO content in sinter, hematite and calcium ferrite decreased obviously. When MgO reaches about 4%, a small amount of magnesian silicate minerals begin to appear in the sintered slag phase. Electron probe scanning analysis shows that MgO is mainly distributed in the iron phase minerals except for hematite, and the magnesium-containing magnetite is formed in the sinter, and the maficite is formed in the pellet, and a small part is distributed in the slag phase in. The Mossbauer spectroscopy studies on the Hangzhou Iron and Steel Pelletizers show that a large amount of Mg 2+ enters the octahedral sites of the magnetite during the calcination process, revealing that the MgO is enriched in the iron phase in the man-made rich ore and Cause the mechanism of phase change. Based on the above experimental study, the effect of MgO on the performance of man-made rich ore metallurgy was analyzed.