Investigation on beneficiation of goethite-rich iron ores using reduction roasting followed by magnetic separation. Issue 3 (3rd July 2019)

• Record Type: Journal Article
• Authors: Ravisankar, Vivek; Venugopal, R.; Bhat, Harikrishna
• Is Part Of: Mineral processing and extractive metallurgy. Volume 128:Issue 3(2019)
• Page Start: 175
• Page End: 182
• Publication Date: 2019-07-03
• Subjects: Iron ore -- reduction roasting -- magnetic separation -- goethite -- Recovery -- Upgradation -- Coal -- Magnetite; Ore-dressing -- Periodicals; Metallurgy -- Periodicals; Metallurgy; Ore-dressing; Periodicals; 669
• DOI: 10.1080/03719553.2017.1412876
• Languages: English
• ISSNs: 2572-6641

Abstract

ABSTRACT: In this study, reductive roasting followed by low-intensity magnetic separation were used to upgrade iron ore from Gua mines in Jharkhand. The work aimed to maximise the recovery of iron values by upgrading to a high-grade product suitable for pelletisation and sintering. The received ore contains 58% Fe, 7.82% silica, 4.26% alumina and 4.97% loss on ignition. Reductive roasting experiments were conducted at times of 10, 20 and 30 min at 600°C, 700°C and 900°C using coal as a reducing agent. Roasted samples were processed using a low-intensity magnetic separator. Best results were obtained at 800°C for 30 min using 10% coal in the charge. Using these conditions a product containing 66.6% Fe was produced at 90.4% recovery. The roasted samples were characterised by XRD which confirms the hematite to magnetite transformation and by SEM which highlighted the porous nature of the upgraded ore. GRAPHICAL ABSTRACT: