Reduction of iron ore by coal in a rotary kiln takes place in two stages: (a) reduction of iron ore by carbon monoxide: Fe 2 O 3 +3CO=2Fe+3CO 2; (b) gasification of carbon of coal by CO 2:C+CO 2 =2CO. In the present paper, kinetic equations have been developed for reduction of iron oxide by carbon monoxide and gasification of coal char …
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The present research work elucidates the pivotal role of raw material ore types in influencing the efficacy of the reduction roasting process. The study investigates …
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The scarcity of high-grade iron ore resource and availability of the considerable quantity of low-grade iron ore fines, banded hematite quartzite (BHQ) ore in mines (mostly in Bihar, Odisha ...
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To utilize the low grade iron ore resources of Karnataka, a banded hematite quartzite (BHQ) type ore was analyzed for its response to inert magnetization roasting …
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Herein, we have presented the feasibility study using reduction roasting process on one of the Indian low-grade BHQ iron ore for the preparation of magnetite …
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BHQ iron ore is presumed to be a sedimentary rock either formed through a chemical or biochemical precipitate of Precambrian origin, consisting of interchanged iron-rich and iron-poor (amorphous silica-rich) layers [3]. ... (available in BHQ) to magnetite phase by the reduction-roasting process followed by the separation of magnetic ...
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The reduction behavior of ore is evaluated based on process separation efficiency, concentrate purity-recovery, and metallization degree. The current study also investigates the effect of microwave exposure on the bonded structure of low-grade BHQ iron ore by comparing it with the synthetic mixture of analytical grade iron oxide and quartz.
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The iron oxides present in the BHQ undergoes reduction similar to lump ore (Fe 2 O 3 → Fe 3 O 4 → FeO). Availability of FeO to initiate the liquid phase is depending on the reducibility, phase distribution and chemistry of the iron bearing materials. Although, the reducibility of BHQ (~66%) is comparatively low, the cumulative reducibility ...
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Reduction roasting followed by magnetic separation has become a major beneficiation technique to utilize low and lean-grade iron ore resources. However, the fundamentals of the reduction nature of iron ore are complex and largely depend upon the mineralogical characteristics of the raw material. In order to ascertain the complexities …
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Under statistically optimized conditions such as temperature: 850 °C, time: 90 min and BFD to ore ratio: 0.4, the process of reduction roasting followed by low intensity magnetic separation (LIMS ...
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Das et al. carried out the beneficiation of BHQ ore from Hospet area, Karnataka, using the flotation and magnetic separation (HGMS) to produce the pellet grade concentrate. ... Rayapudi et al. performed the microwave reduction of BHJ and BHQ ore using charcoal. They observed that ferrite phase was formed within 10 min with ≤ 8 …
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DOI: 10.1016/J.MINPRO.2014.05.006 Corpus ID: 95066033; Influence of band thickness of banded hematite quartzite (BHQ) ore in flotation @article{Rath2014InfluenceOB, title={Influence of band thickness of banded hematite quartzite (BHQ) ore in flotation}, author={Swagat S. Rath and Hrushikesh Sahoo and Sushanta Kumar Das and …
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eficiation studies of BHQ ore from Hospet, Karnataka. Flotation studies of ore produced a product containing 64.68% Fe with recovery of 66.38% at 9.5 pH value [10]. Rayapudi et al. performed the microwave reduction of BHJ and BHQ ore using charcoal. They observed that ferrite phase was formed within 10 min with B 8 (wt%) charcoal at 900 W power.
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The BHJ ore showed high specific comminution energy for size reduction compared to the BHQ ore. The information obtained from these tests could be used to compare material hardness as well as to evaluate energy requirements in grinding. References. Das B, Mishra BK, Prakash S, Das SK, Reddy PSR, Angadi SI (2010b) …
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The present study focuses on the mineralogical aspects and roasting of iron ore (Fe: 55.4%) fines in both fixed bed and fluidized bed roaster. Goethite is the dominant mineral phase in this low-grade iron ore containing hematite, silica and alumina. Such ore was roasted at a constant temperature of 900°C, with non-coking coal of 20% at …
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Several studies have shown the reduction of iron ore directly by gaseous mixtures (Dry et al. 1987;Olivares 1989;Srinivasan 2002;Yu et al. 2017c). ... (BHQ) ore in mines (mostly in Bihar, Odisha ...
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The BHJ ore showed high specific comminution energy for size reduction compared to the BHQ ore. The information obtained from these tests could be used to …
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Download scientific diagram | Feed characterization of BHQ iron ore head sample. a: size distributional analysis; b: XRD analysis of head sample; c,d: optical microscopic study of the head sample ...
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Sample-3 (BHQ) and Sample-4 (BHJ) demonstrated moderate responses to the reduction roasting process, resulting in 62.4% Fe-grade with about 60.9% recovery and 63.26% Fe-grade with approximately 81.9% recovery, respectively.
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Previous researchers used the costly beneficiation methods like reduction roasting (12,15) enhance gravity separation (9) and froth flotation methods for beneficiation of BHQ and BHJ iron ore. The developed technology by the researchers is far from conventional beneficiation techniques and requires huge capital and operating resources.
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The BIF is a combination of Banded Hematite Jasper (BHJ) and Banded Hematite Quartzite (BHQ). The iron ore deposits of the Horseshoe belt of Eastern India is famous for its rich deposit of high-grade hematite ores. ... Kinetics and mechanisms of direct reduction of iron ore-biomass composite pellets with hydrogen gas. International …
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Hydro-cyclone to get a product suitable for subsequent use in the sinter mix. 3 [ 1] BHQ iron ore samples of very low grade containing only 38-40 wt-% of iron Haematite and quartz are the major ...
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In many parts of India, because of depletion in high grade iron ore, efforts are focused on the use of low-grade 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 …
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The reducibility tests on the three different lump ores indicated that the reducibility index of ore-1 was higher (76.33%) as compared to ore-2 (65.41%) and ore-3 (63.67%).
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throughput, improved size reduction ratio and maximized energy efficiency. In this study, emphasis has been given to study this aspect and the objective is to optimize the pro-cess parameters during grinding of hard banded hematite quartzite iron ore (BHQ) in HPGR. 2 Materials and Methods A banded iron ore (BHQ) sample from Odisha was used in ...
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During the reduction process, the dispersion of the ore material increases, the bonds between the mineral particles get weakened, and as a result, iron oxide particles get reduced to the lower state under the reducing atmosphere. ... The flotation studies of BHQ ore using cetylpyridinium chloride and benzyl dimethyl tetradecyl ammonium …
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Para-magnetic iron ore, consisting primarily of hematite, limonite or siderite can be converted to magnetite by reduction roasting process. This magnetite can be …
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There are several processes for direct reduction of iron ore: gas-based shaft furnace processes (Midrex® and Energiron being the main ones) - accounting for 75.8% of 2019 DRI production (total 108.1 million tonnes);
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It occurs in the iron ore mining benches either on the top of the ore or laterally with ore or within the ore, whose removal is imperative for proper development of mine benches during iron ore excavation. Based on the Fe%, as per IBM classification, Fe < 45% BHJ/BHQ has been classified as waste rock and more than 45% Fe as Sub-grade.
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The reduction roasting process is one of the potential alternatives to overcome such challenges. Herein, we have presented the feasibility study using …
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