A Study on Removal of Clay Minerals from Barbil Region Iron Ore; Effect of Scrubbing Followed by Pelletization
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A Study on Removal of Clay Minerals from Barbil Region Iron Ore; Effect of Scrubbing Followed by Pelletization Soumya Sahoo 1 & Sachida Nanda Sahu 2
&
Ranajit Kumar Sahoo 2 & Shatrughan Soren 1 & Surendra Kumar Biswal 2
Received: 2 June 2020 / Accepted: 18 August 2020 # Society for Mining, Metallurgy & Exploration Inc. 2020
Abstract The presence of appreciable quantity of clay mineral in Indian hematite ore needs an attrition technique using screw scrubber in the beneficiation circuit to remove the ultrafine clays and avoid downstream operational problems. Spectroscopic analysis revealed that iron ore samples obtained from the Barbil region of Odisha contain a high amount of silica and alumina in the form of clay minerals (e.g., kaolinite) contributed as a loss on ignition (LOI) in the iron-making process. Iron ore fines of below 10 mm size were subjected to a laboratory-scale screw scrubber, and the effectiveness of scrubbing as well as the pelletization of the scrubbed product was investigated. The screw scrubber in the beneficiation circuit helps to remove the clay minerals, causes an increase in iron values from 63.65% Fe(T) to 66.18% Fe(T), with improved physical (CCS of 325 kg/pellet) and metallurgical (RDI of 2.24%) pellet properties. Keywords Iron ore . Clay minerals . Screw scrubber . Spectroscopy . Pelletization
1 Introduction The iron and steel industry consumes a significant part (about 98%) of iron ore. In India, hematite and magnetite iron ores are widely available. Out of 33,276 billion tonnes of hematite (Fe2O3) and magnetite (Fe3O4), Eastern sector (Assam, Bihar, Chhattisgarh, Jharkhand, and Odisha) has around 79% hematite ore deposits, while approximately 93% magnetite ore deposits are found in Southern sector (Andhra Pradesh, Karnataka, Kerala, and Tamil Nadu) [IBM-2018]. Odisha contributes around 34% of the national deposit of hematite [IBM-2018]. The growth and development of the Indian economy depend to a great extent on the iron and steel industry. As per the national steel policy 2018, steel production will be enhanced to 300 MTPA, and to achieve this target, around 450 MT high-grade ores will be required. The country is not bestowed with high-grade iron-ore resources. Therefore, beneficiation followed by pelletization routes are the need of the
* Sachida Nanda Sahu [email protected] 1
Department of Fuel, Minerals and Metallurgical Engineering, IIT-ISM, Dhanbad 826004, India
2
CSIR – Institute of Minerals and Materials Technology, Bhubaneswar, Odisha 751013, India
hour to achieve the best use of low- and lean-grade iron-ore resources [1, 2]. The utilization of low- and lean-grade iron-ore resources is associated with critical issues from both an environmental as well as from the resource conservation point of view. In recent times, the efforts have intended to utilize the low-grade iron ore by upgrading its iron value through various beneficiation processes. However, the nature of the iron phase minerals associated with other gangue minerals determines the method of beneficiation t
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