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综合运用光学显微镜和显微图像分析仪等测试仪器和手段,对不同预热和焙烧条件下,巴西赤铁精矿与云南省内磁铁精矿搭配使用时氧化球团的矿物组成、显微结构以及焙烧固结机理进行了重点研究。研究结果表明,无论在预热阶段还是焙烧阶段,由于磁铁矿氧化生成的新生Fe2O3活性较赤铁矿颗粒中的原生Fe2O3活性高,能够促进颗粒间Fe2O3再结晶的形成。因此,在赤铁精矿中适量配加磁铁精矿生产氧化球团,有利于降低预热焙烧温度,提高球团矿质量。
Comprehensive use of optical microscope and microscopic image analyzer and other testing instruments and means for different preheating and roasting conditions, the combination of hematite in Yunnan Province and the use of magnetite concentrate when the oxide pellets of mineral composition, microstructure As well as roasting and consolidation mechanism. The results show that the formation of recrystallized Fe 2 O 3 particles can be promoted by the activity of fresh Fe 2 O 3 generated by the oxidation of magnetite in the preheating and calcination stages. Therefore, the appropriate amount of hematite concentrate with magnetic concentrate production of oxide pellets, is conducive to reducing the preheating calcination temperature, improve pellet quality.