Mineralogical Characterization-Assisted Reduction Roasting of Banded Hematite Jasper Ore
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ORIGINAL CONTRIBUTION
Mineralogical Characterization-Assisted Reduction Roasting of Banded Hematite Jasper Ore Ranu Srivastava1 . Ranjit Prasad1
Received: 1 June 2020 / Accepted: 8 September 2020 Ó The Institution of Engineers (India) 2020
Abstract In many parts of India, because of depletion in high grade iron ore, efforts are focused on the use of lowgrade iron ore for steel production. As an alternative iron source, low-grade banded iron ores have attracted attention. The beneficiation and utilization of banded iron ore is closely connected to their mineralogical characteristics, nature of impurity inclusion and liberation behavior. Characterization studies indicated that ore was low in iron value (* 36.5 wt%), and contained high amount of silica (* 46.3 wt%), which made it difficult to process by conventional beneficiation method. Therefore, we used reduction roasting method on the ore to produce the pellet feed material. Different process parameters such as roasting time, temperature and coal-ore ratio were optimized to achieve the maximum recovery and grade of magnetic product. Using coal as reducing agent, the optimum condition was found to be as, reduction temperature: 900 °C, time: 90 min, and coal-ore ratio: 15%. Under the optimum condition, maximum recovery and grade of magnetic product were found to be 72% and 65%, respectively. Keywords Banded hematite jasper Characterization Reduction roasting Coal Low-intensity magnetic separator
& Ranu Srivastava [email protected] 1
Department of Metallurgical and Materials Engineering, National Institute of Technology, Jamshedpur 831014, India
Introduction India’s 2030 steel vision aims to produce 300 million ton steel per year which needs 550 million tons of high quality iron ore per year (approx. 60% Fe). India does not have sufficient rich quality iron ore reserves but carries plentiful resources of banded iron ore. A major amount of banded iron ore is generated during the traditional mining of hematite ore, which is stockpiled as waste resources around the mines site [1]. These ores contain 30–40 wt% iron. It is anticipated that effective utilization of such resources can completely eliminate the crises of desirable rich quality iron ore. Research studies on the processing of banded iron ore are limited and beneficiation methods such as hydrocyclone, WHIMS and flotation are described. These traditional processing techniques give poor response due to complex mineralogical nature of ore. In conventional method, fine grinding of ore is required to perform the various beneficiation operations. In some cases, using the conventional method, iron grade can be improved up to the required pellet feed ([ 60% Fe), but due to low value of recovery and yield, this method is not economically feasible [2–4]. Therefore, to overcome all these problems, an alternative method such as reduction roasting with lowintensity magnetic separation needs to be implemented. Rath et al. utilized cow dung cakes for the reduction studies of iron ore slimes of Barsua ar
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