Effect of MgO/Al2O3 on Metallurgical Properties of Sinter
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摘要: 采用实验室烧结杯试验装置,研究MgO/Al2O3在0.8~1.2时,MgO/Al2O3对烧结矿强度、粒度组成、RDI和RI的影响,采用金相显微镜和X-射线衍射仪对烧结矿微观结构和矿物组成进行分析。表明:随着MgO/Al2O3的增加,烧结矿强度呈先升高后降低的趋势,且当MgO/Al2O3为1.0时,强度最好,10~40 mm粒度所占比例为58.85%。随着MgO/Al2O3由0.8增加到1.2的过程中,烧结矿RDI得到改善,还原性变差。当MgO/Al2O3在0.9~1.0时,球团矿微观形貌和矿物组成较好,在此范围内,赤铁矿和复合铁酸钙数量较多,强度较好。在用进口矿和本地磁铁矿搭配烧结时,MgO/Al2O3控制在0.9~1.0范围内,微观形貌和冶金性能较好。Abstract: The effect of MgO/Al2O3 on the metallurgical properties of sinter was studied by laboratory sintering cup test device.The effects of MgO/Al2O3 on sinter strength,particle size composition,RDI and RI were studied in the range of 0.8 to 1.2.Microstructure and mineral composition of sinter were analyzed by metallographic microscope and X-ray diffraction.With the increase of MgO/Al2O3,the strength of sinter increases first and then decreases.When MgO/Al2O3 is 1.0,the strength is the best,and the proportion of 10 to 40 mm particle size is 58.85%.With the increase of MgO/Al2O3 from 0.8 to 1.2,the RDI of sinter is improved and the reducibility is worse.When MgO/Al2O3 is in the range of 0.9 to 1.0,the micro-morphology and mineral composition of pellets are better.Within this range,hematite and composite calcium ferrite have more quantity and better strength.When sintering with imported ore and local magnetite,MgO/Al2O3 is controlled in the range of 0.9 to 1.0 in order to obtain better micro-morphology and metallurgical properties.
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Key words:
- sinter /
- MgO/Al2O3 /
- metallurgical properties /
- mineral composition
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