Beneficiation of Indian High Alumina Iron Ore Fines – a Case Study

Raghukumar, C.; Tripathy, Sunil Kumar; Mohanan, Srijith

doi:10.5923/j.mining.20120102.11

Cited by 28 publications

(11 citation statements)

References 6 publications

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“…Some were directly used as a sintering raw material at a low ratio, which affected the sintering process adversely [5]. Therefore, many separating approaches have been published for high-aluminum iron resources, which can be classified as: (1) physical processes like gravity concentration and magnetic separation [6,7] and flotation [8], (2) pyrometallurgical processes containing solid-state reduction [4,[9][10][11][12], and smelting [12][13][14][15]. So far, iron and aluminum cannot be separated completely by physical processes and flotation processes, and more than 10% of sodium additive is required by the solid-state sodium roasting process, leading to a high risk of the degradation of refractory materials in furnaces [16] and higher costs.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Reduction of High-Aluminum Iron Ore by Synergistic Reducing with High-Manganese Iron Ore

Zhou

Luo

Chen

et al. 2018

Metals

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How to utilize low grade complex iron resources is an issue that has attracted much attention due to the continuous and huge consumption of iron ores in China. High-aluminum iron ore is a refractory resource and is difficult to upgrade by separating iron and alumina. An innovative technology involving synergistic reducing and synergistic smelting a high-aluminum iron ore containing 41.92% Fetotal, 13.74% Al2O3, and 13.96% SiO2 with a high-manganese iron ore assaying 9.24% Mntotal is proposed. The synergistic reduction process is presented and its enhancing mechanism is discussed. The results show that the generation of hercynite (FeAl2O4) and fayalite (Fe2SiO4) leads to a low metallization degree of 66.49% of the high-aluminum iron ore. Over 90% of the metallization degree is obtained by synergistic reducing with 60% of the high-manganese iron ore. The mechanism of synergistic reduction can be described as follows: MnO from the high-manganese ore chemically combines with Fe2SiO4 and FeAl2O4 to generate Mn2SiO4, MnAl2O4 and FeO, resulting in higher activity of FeO, which can be reduced to Fe in a CO atmosphere. The main products of the synergistic reduction process consist of Fe, Mn2SiO4, and MnAl2O4.

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Section: Introductionmentioning

confidence: 99%

Enhancing the Reduction of High-Aluminum Iron Ore by Synergistic Reducing with High-Manganese Iron Ore

Zhou

Luo

Chen

et al. 2018

Metals

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“…It is a very fine material, even below the grade of palletizing. With decrease in fineness, its gangue (silica and alumina) content increases [1]. The average total alumina and silica content varies to be around 8-20 wt%.…”

Section: Introductionmentioning

confidence: 98%

“…This settled material is termed slime. The slime generated from hematite ore mainly contains hematite with a small amount of goethite and the gangue minerals like gibbsite, kaolinite and quartz [1,2]. It is a very fine material, even below the grade of palletizing.…”

Section: Introductionmentioning

confidence: 99%

“…Its reuse is required to reduce the environmental load and to conserve mineral resources as well. Although several investigators [1,[3][4][5][6][7][8] have developed flow sheets for its beneficiation, the use of the beneficiated concentrate is still under the scope of the study. Some investigators [9,10] have tried to use it directly in the form of cold bonded briquettes as coolant in the steel making converter.…”

Section: Introductionmentioning

confidence: 99%

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Development of hematite ore pellet utilizing mill scale and iron ore slime combination as additive

Rajshekar

Pal

Venugopalan

2018

J min metall B Metall

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Iron ore slime is generated from mines during processing and washing of iron ore, and it is not considered for pelletizing due to its excessive fineness and high gangue content, despite its good green bonding property. Mill scale is generated from steel rolling mills and reheating furnaces; it has almost nil gangue content, but is not individually considered for pelletizing due to its poor green bonding property. If both of these two wastes are blended in combined form with hematite ore, the high gangue of slime would be balanced by the gangue free mill scale. While mill scale provides exothermic heat of oxidation of FeO and Fe 3 O 4 in it and enhance the diffusion bonding, slime provides good green bonding property to the pellet. Therefore, in this study a good quality pellet was developed by the combined mixing of these two wastes in hematite ore without much increase in gangue content. Up to 15% of mill scale and 15% of slime could be used successfully. The developed pellets provide improved cold compressive strength (366 kg/ pellet), reducibility index (82%), and reduction degradation index (8.5%). Induration temperature could be reduced by 75 °C, which indicates a considerable energy saving in induration furnace.

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“…Many upgrading approaches have been published for high-aluminum limonite ore, including physical and chemical processes [4]. Recent research was focused on gravity concentration and magnetic separation [7], flotation [8,9], sodium roasting and the magnetic separation process [3,[10][11][12][13][14][15]. However, iron and aluminum cannot be separated completely by physical processes, completely by physical processes, so iron recovery is low by the flotation process (around 70%), and as high as beyond 10% of sodium additive is needed by the sodium roasting process, which brings the risk of the degradation of refractory materials in furnaces [16,17] and higher costs.…”

Section: Introductionmentioning

confidence: 99%

Upgrading of High-Aluminum Hematite-Limonite Ore by High Temperature Reduction-Wet Magnetic Separation Process

Zhou

Zhu

Pan

et al. 2016

Metals

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Abstract:The huge consumption of iron ores in China has attracted much attention to utilizing low grade complex iron resources, such as high-aluminum hematite-limonite ore, which is a refractory resource and difficult to upgrade by traditional physical concentration processes due to the superfine size and close dissemination of iron minerals with gangue minerals. An innovative technology for a high temperature reduction-magnetic separation process was studied to upgrade a high-aluminum iron ore assaying 41.92% Fe total , 13.74% Al 2 O 3 and 13.96% SiO 2 . The optimized results show that the final metal iron powder, assaying 90.46% Fe total , was manufactured at an overall iron recovery of 90.25% under conditions as follows: balling the high aluminum iron ore with 15% coal blended and at 0.3 basicity, reducing the dried pellets at 1350˝C for 25 min with a total C/Fe mass ratio of 1.0, grinding the reduced pellets up to 95%, passing at 0.074 mm and magnetically separating the ground product in a Davis Tube at a 0.10-T magnetic field intensity. The metal iron powder can be used as the burden for an electric arc furnace (EAF). Meanwhile, the nonmagnetic tailing is suitable to produce ceramic, which mainly consists of anorthite and corundum. An efficient way has been found to utilize high-aluminum iron resources.

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Beneficiation of Indian High Alumina Iron Ore Fines – a Case Study

Cited by 28 publications

References 6 publications

Enhancing the Reduction of High-Aluminum Iron Ore by Synergistic Reducing with High-Manganese Iron Ore

Enhancing the Reduction of High-Aluminum Iron Ore by Synergistic Reducing with High-Manganese Iron Ore

Development of hematite ore pellet utilizing mill scale and iron ore slime combination as additive

Upgrading of High-Aluminum Hematite-Limonite Ore by High Temperature Reduction-Wet Magnetic Separation Process

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