Utilization of High-Alumina Iron Ore in Pellet Making Through Process Optimization

IF 1.6 4区材料科学 Q2 Materials Science Transactions of The Indian Institute of Metals Pub Date : 2024-07-03 DOI:10.1007/s12666-024-03390-0

Ravindra Kumar, Ravi Kant Sagar, Rameshwar Sah, Vyshnu Kumar, Raghunath Srinidhi, G. Balachandran

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Abstract

The demand for pellets in blast furnaces has recently increased because of their uniform shape and size, controlled chemistry, iron-enriched feed, high strength, and quality consistency. To meet this demand, low- and medium-grade iron ore fines with alumina (> 3.5 wt%) must be used for pelletization because of the limited availability of high-grade ore. The alumina present in the ore has an adverse effect on the pellet properties because of its refractory nature. Therefore, a study was conducted to optimize the firing temperature and chemistry of the feed blend to produce pellets with good pellet properties. Firing temperature (1280 °C, 1300 °C, and 1320 °C), carbon (1 and 1.2%) in the form of coke fines, and MgO (0.60 and 0.80%) in the form of dolomite were used to optimize the pellet-making process for high-alumina iron ore fines. The best result was obtained for feed blend with 1.2% carbon and 0.80% MgO fired at 1300 °C to produce pellets of cold compressive strength more than 300 kg/pellet, reduction degradation index (− 6.33 mm) near 7%, and porosity near 20%.

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通过工艺优化在制粒过程中利用高铝铁矿石

高炉对球团矿的需求近来有所增加，因为球团矿具有形状和大小均匀、化学成分可控、给料富含铁、强度高和质量稳定等特点。为满足这一需求，由于高品位矿石供应有限，必须使用含氧化铝（3.5 wt%）的中低档铁矿粉进行球团。矿石中的氧化铝具有难熔性，会对球团特性产生不利影响。因此，研究人员对焙烧温度和混合原料的化学成分进行了优化，以生产出具有良好球团特性的球团。研究采用了焙烧温度（1280 ℃、1300 ℃ 和 1320 ℃）、焦炭粉形式的碳（1% 和 1.2%）以及白云石形式的氧化镁（0.60% 和 0.80%）来优化高铝铁矿粉的球团制造工艺。碳含量为 1.2% 和氧化镁含量为 0.80% 的混合料在 1300 °C 煅烧时获得了最佳效果，生产出的球团冷抗压强度超过 300 千克/球团，还原降解指数（- 6.33 毫米）接近 7%，孔隙率接近 20%。

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来源期刊

Transactions of The Indian Institute of Metals Materials Science-Metals and Alloys

CiteScore

2.60

自引率

6.20%

发文量

期刊介绍： Transactions of the Indian Institute of Metals publishes original research articles and reviews on ferrous and non-ferrous process metallurgy, structural and functional materials development, physical, chemical and mechanical metallurgy, welding science and technology, metal forming, particulate technologies, surface engineering, characterization of materials, thermodynamics and kinetics, materials modelling and other allied branches of Metallurgy and Materials Engineering. Transactions of the Indian Institute of Metals also serves as a forum for rapid publication of recent advances in all the branches of Metallurgy and Materials Engineering. The technical content of the journal is scrutinized by the Editorial Board composed of experts from various disciplines of Metallurgy and Materials Engineering. Editorial Advisory Board provides valuable advice on technical matters related to the publication of Transactions.