Studies on the Mechanical and Physical Properties of Hematite Iron Ore Pellets Prepared Under Different Conditions
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ORIGINAL ARTICLE
Studies on the Mechanical and Physical Properties of Hematite Iron Ore Pellets Prepared Under Different Conditions Anand Babu Kotta1 Mithilesh Kumar3
•
D. Narsimhachary2 • Swapan Kumar Karak3
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Received: 16 June 2020 / Accepted: 3 August 2020 The Indian Institute of Metals - IIM 2020
Abstract The global iron-producing industries are trying to use the high alumina content iron ores due to the exiguity of high-grade ores and economic reasons. For this purpose, this present study focuses on the utilization of high alumina hematite iron ores obtained from eastern part of India in pelletization experiments. The effects of firing temperature and time, and binder addition on compressive strength, porosity and XRD analysis of resultant pellets were investigated. The experimental results showed that the amount of Al2O3 in the iron ore pellets did not show a much variation on the compressive strength (\ 100 N) and porosity with increase in temperature up to 1373 K, followed by a gradual change in their values with further rise of firing temperature up to 1573 K. The X-ray diffraction patterns of resultant fired hematite iron ore pellets did not show any change in the major phase. Keywords Hematite iron ore Pellet Binder Molasses Firing temperature and time Compressive strength Porosity
& Anand Babu Kotta [email protected] 1
Department of Mechanical Engineering, G H Raisoni College of Engineering, Nagpur, Maharastra 440016, India
2
International Advanced Research Centre for Powder Metallurgy and New Materials, Hyderabad, Telangana 500005, India
3
Department of Metallurgical and Materials Engineering, National Institute of Technology Rourkela, Rourkela, Orissa 769008, India
1 Introduction Iron and steel industries are mainly the driving force of development in any country, and this industry has a great influence on the country’s economic status [1]. As reported in the literature (Joint Plant Committee, 2019), India became the second largest steel producer in 2018 (about 106.5MT) and it accounts for nearly 6% of world crude steel production [2]. This has increased the demand of high-quality raw materials, such as iron ores, coal and limestone. Over the time, the reserves of high-grade iron ores are getting continuously depleted due to enormous excavation, and thus, iron-producing industries are turning toward the utilization of enormous amounts of low-grade iron ore lumps and fines [3, 4]. The generated iron ore fines are not suitable for feed to any iron-making processes because they create problems inside the reactors [5]. The utilization of these iron ore fines in iron making will be a positive step toward the economic development of the nation [6]. Till date, pelletization and sintering have been proved to be the most appropriate techniques for the utilization of these iron ore fines [7]. Pelletization is suitable for iron ore fines having size less than 100 mesh [8]. This requirement makes the pelletization process little bit more costly. However, researches are going on to mak
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