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The experiments in WHIMS were carried out in order to understand the role of thermal treatment on the magnetic separation of the iron ore. Initially, the samples thermally treated at temperatures 500, 600, 700, and 800 °C for a fixed time interval of 30 min were undergone WHIMS at different magnetic intensities such as 0.77, 1.05, 1.18 …
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Demand for iron ore worldwide has been steadily increasing which leads to the extraction of iron ore deposits with more complex mineralogies and higher levels of silicon and phosphorus impurities. This is the case in Algeria with the iron ore deposit of Gara Djebilet, Tindouf; where it has recently been exploited to ensure the sufficiency of …
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To reveal the formation and characteristics of metallic iron grains in coal-based reduction, oolitic iron ore was isothermally reduced in various reduction times at various reduction temperatures. The microstructure and size of the metallic iron phase were investigated by scanning electron microscopy, energy-dispersive X-ray spectroscopy, …
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The reduction of hematite to magnetite or metallic iron has been well documented over many decades and only selected references involving roasting of …
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In this study, the beneficiation of an Oolitic-iron ore (containing 45.46wt% Fe2O3) with magnetization roasting by non-coking coal (containing 62.1wt% fixed carbon) under a stream of argon gas was investigated. Then, a 2500 Gaussian magnet was used for dry magnetic separation method. The effects of roasting time, ore particle size and reaction ...
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Table 1 presents the lean iron ore (XRF) chemical analysis results and the proximate analysis of high ash coal samples. Fig. 1(a) displays the phase analysis to identify the lean iron ore constituent phases. The results in Table 1 indicate that the iron ore is lean, containing only 44% iron, with the main gangue phase being silicon at 17%.
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High phosphorous oolitic hematite ore is one of typical intractable iron ores in China, and the conventional beneficiation methods are found to be impracticable to remove phosphorus from the ore ...
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A large number of studies have shown that oolitic hematite is an iron ore that is extremely difficult to utilize because of its fine disseminated particle size, high harmful impurity content and oolitic structure. ... Phase transformation during roasting process and magnetic beneficiation of oolitic-iron ores. Vacuum, Volume 146, 2017, pp. 63-73.
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Oolitic iron ores are a distinctive subset of iron ore deposits, and are characterised by their spherical grains composed of concentric layers containing …
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A nearly mono-phased product of iron powder can be extrac- ted from the Xuanlong-type oolitic iron ore by a process of deep-reduction and subsequent wet mill- ing and magnetic separation. The optimized deep-re- duction condition is 1200 -C and 60 min with coal content of 30% in the ore-coal mixture.
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Microwave liberation is a promising method for beneficiation of oolitic hematite but has not been used in industrial production. This is because the specific microwave energy requirements for iron ...
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Youssef and Morsi tested a low-grade oolitic iron ore from the Aswan region of Egypt, assaying 45.23% Fe ... The RHF process has clearly achieved deep reduction and opens the possibility of treating lower grade refractory iron ore from beneficiation plants. However, its high energy consumption and low productivity are the obstacles to its ...
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Deep dephosphorization of high‑phosphorus oolitic iron ore (HPOIO) is extremely difficult because of its refractory characteristics. A new approach for simultaneous iron recovery and dephosphorization from HPOIO by oxidation roasting–gas-based reduction (ORGR) and magnetic separation process was developed.The underlying …
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The unutilized iron ore fines (IOF, − 10 mm, 45% to < 60% Fe(T)) left at various mine sites during blasting and processing are rich in goethetic-hematite associated with high clay and considered a potential iron ore resource. The variation of loss on ignition (LOI) from mines to mines is based on the goethite and clay mineral content. The clay …
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In this study, the beneficiation of an Oolitic-iron ore (containing 45.46wt% Low-grade iron ores contain many impurities and are difficult to upgrade to make appropriate concentrates for the blast furnace (BF) or direct reduction (DR) technologies. In this study, the beneficiation of an Oolitic-iron ore (containing 45.46wt% ...
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Oolitic iron ore [7], a type of refractory mineral resource, is being considered with great importance, because of its huge abundance and the increasing demand of iron ores globally. ... Reductive roasting and magnetic beneficiation of oolitic iron ores from west Hubei province were performed in this research. The properties during the roasting ...
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The quality of Indian iron ore resources is generally good with high iron content and high percentage of lumpy ore. More than 85% of the hematite ore reserves are of medium- to high-grade (+62% Fe) and are directly used in blast furnace and in direct-reduced iron (DRI) plants in the form of sized lump ore, agglomerated sinter, and …
DetailsIn this paper, an innovative method is proposed to upgrade iron and remove phosphorus from high-phosphorus oolitic hematite ore by the sodium magnetization roasting–magnetic separation–sulfuric acid and sodium hydroxide leaching process. The process parameters of sodium magnetization roasting, acid leaching, and alkaline …
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In this study, the beneficiation of an Oolitic-iron ore (containing 45.46wt% Fe2O3) with magnetization roasting by non-coking coal (containing 62.1wt% fixed carbon) under a …
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Low-grade iron ores contain many impurities and are difficult to upgrade to make appropriate concentrates for the blast furnace (BF) or direct reduction (DR) technologies. In this study, the beneficiation of an Oolitic-iron ore (containing 45.46wt% Fe2O3) with magnetization roasting by non-coking coal (containing 62.1wt% fixed carbon) under a …
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Oolitic iron ore is one of the most important iron resources. This paper reports the recovery of iron from high phosphorus oolitic iron ore using coal-based reduction and magnetic separation. The influences of reduction temperature, reduction time, C/O mole ratio, and CaO content on the metallization degree and iron recovery were …
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Table 2. Iron phase composition of high-phosphorus oolitic hematite (%). Mineralogy research indicates that oolitic hematite ore belongs to a high-phosphoric-acid orebody. The primary valuable minerals are hematite and limonite, accompanied by small amounts of magnetite and siderite.
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Oolitic iron ore is one of the most important iron resources. This paper reports the recovery of iron from high phosphorus oolitic iron ore using coal-based reduction and magnetic...
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A process involving coal-based direct reduction followed by wet low-intensity magnetic separation is presented in this paper with the objective of promoting the Fe content and …
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A laboratory experiment was carried out to extract iron from oolitic iron ore by a deep reduction and magnetic separation technique. The raw coal with fixed carbon of 66.54% was used as the reductant. The iron was successfully extracted from the oolitic iron ore which otherwise is nearly impossible to be separated due to its extremely fine …
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This review focussed on two main aspects of oolitic iron ore processing: beneficiation by conventional mineral processing techniques (differential grinding, scrubbing, gravity concentration, magnetic concentration, flotation, oil agglomeration and …
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The oolitic gravity magnetic (GM) iron concentrate was supplied by the Lisakovsky iron ore beneficiation plant in Kazakhstan. The plant flowsheet involves ore …
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DOI: 10.1016/J.VACUUM.2017.09.029 Corpus ID: 103764889; Phase transformation during roasting process and magnetic beneficiation of oolitic-iron ores @article{Peng2017PhaseTD, title={Phase transformation during roasting process and magnetic beneficiation of oolitic-iron ores}, author={Tiefeng Peng and X. D. Gao and …
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Fig. 2 Optical image of oolitic iron ore 2.2 Methods The iron ore was roasted in a suspension roasting furnace designed by Northeastern University. The schematic diagram of suspension roasting furnace is shown in Fig. 3. The iron ore samples were crushed and ground to 80% passing 0.074 mm sieve pore size. A 40% H2−60% N2 gas mixture was …
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On the other hand, the oolitic iron ore shows better reduction within the range of 550-650 • C, beyond which it has the reverse effect [13]. ... In the process of iron ore beneficiation, a ...
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Microwave liberation is a promising method for beneficiation of oolitic hematite but has not been used in industrial production. This is because the specific microwave energy requirements for iron ore applications is prohibitively high and there is a lack of quantitative references for microwave irradiation parameters.
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is the key to developing the efficient beneficiation of oolitic iron ores. Various analytical techniques can be used to characterize iron ores, among which X-ray Diffraction (XRD), X-ray fluorescence
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In this study, the beneficiation of an Oolitic-iron ore (containing 45.46wt% Fe2O 3) with magnetization roasting by non-coking coal (containing 62.1wt% fixed carbon) under a …
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The beneficiation of low-grade iron ores to meet the growing demand for iron and steel is an important research topic. ... The available reserves of high-phosphorus oolitic iron ore located in ...
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Most irons existed in hematite with a distribution rate of 97.09%. A small amount of iron existed in magnetite and siderite. In order to identify the types of minerals in ore samples further, the ...
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1. Introduction. The processing and utilization of iron ores are intimately linked to their mineralogical characteristics, liberation pattern, and the nature of inclusion of the impurities such as SiO 2, Al 2 O 3, P and S.The goethitic, oolitic and wad type ores containing high silica and alumina are very difficult to process by conventional …
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In this study, a high-phosphorus oolitic iron ore containing 44.70% Fe and 1.56% P from western Hubei of China was collected as the sample. The chemical composition, mineral composition, structure characteristics, dissemination characteristics, and iron and phosphorus occurrence state were carried out to investigate the …
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This research is aimed at the up-gradation of indigenous Pakistani iron ore, i.e., Dilband iron ore (hematite), by utilizing common metallurgical processes. First, the magnetic properties of the ore were determined. Initially, the iron ore samples contained 34 wt. % Fe in addition to other gangue materials. Therefore, the ore was subjected to a …
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