Growth Kinetics of Metallic Iron Phase in Coal-based Reduction of Oolitic Iron Ore

Sun, Yongsheng; Han, Yuexin; Gao, Peng; Li, Yanjun

doi:10.2355/isijinternational.isijint-2016-253

Cited by 15 publications

(5 citation statements)

References 32 publications

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“…In terms of kinetics, the DIFT is a nucleation-dominated process. By contrast, continuous cooling transformation or isothermal transformation without deformation are grain growth–dominated processes [ 12 , 13 , 14 , 15 ].…”

Section: Resultsmentioning

confidence: 99%

Influence of Hot Plastic Deformation in γ and (γ + α) Area on the Structure and Mechanical Properties of High-Strength Low-Alloy (HSLA) Steel

et al. 2016

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The main goal of this study was to develop a new processing technology for a high-strength low-alloy (HSLA) steel in order to maximize the mechanical properties attainable at its low alloy levels. Samples of the steel were processed using thermal deformation schedules carried out in single-phase (γ) and dual-phase (γ + α) regions. The samples were rolled at unconventional finishing temperatures, their final mechanical properties were measured, and their strength and plasticity behavior was analyzed. The resulting microstructures were observed using optical and transmission electron microscopy (TEM). They consisted of martensite, ferrite and (NbV)CN precipitates. The study also explored the process of ferrite formation and its influence on the mechanical properties of the material.

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Section: Resultsmentioning

confidence: 99%

Influence of Hot Plastic Deformation in γ and (γ + α) Area on the Structure and Mechanical Properties of High-Strength Low-Alloy (HSLA) Steel

et al. 2016

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“…[8][9][10][11] When reduced at 1 100-1 200°C for 50-100 min, products with metallization ratio ~90% were obtained. 2,[12][13][14][15] After grinding and magnetic separation, concentrates with ~90 wt% TFe at recovery of ~80% were achieved. However, it is energy intensive because it involves such a high temperature step.…”

Section: Introductionmentioning

confidence: 99%

Reduction Mechanism and Kinetics of a Low Grade Iron Ore-coal Composite Pellets Improved by Sodium Salt

Zhong

Huang

et al. 2020

ISIJ Int.

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Reduction behavior of low grade iron ore-coal composite pellets was investigated in the temperature range of 850-1 000°C. Effects of the sodium salt addition on the reduction behavior and kinetics were researched. Reduction samples were analyzed by applying X-ray Diffraction (XRD) and scanning electron microscope-energy dispersive spectroscopy (SEM-EDS) to reveal its function mechanism. Results demonstrated that composite pellets without sodium salt showed poor reduction performance at lower temperatures (below 950°C) for most of wustite phase transferred into fayalite rather than iron. Raising reduction temperature can restrain fayalite formation to some extent, but the effect was limited. However, the reduction process of wustite to iron was improved by sodium salt in temperature range of 950-1 000°C for its favourable inhibiting effect on formation of fayalite. SEM-EDS analysis of reduced samples revealed that sodium salt also enhanced the growth of newly formed metallic iron particles. The reduction process of composite pellets was diffusion controlled reaction in the temperature range of 850°C-1 000°C. The activation energy decreased from 545.06 kJ/mol to 135.77 kJ/mol as 3 wt% of sodium salt was applied.

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“…However, the intimately intermixed structural unit of both fluorapatite and chamosite in high-phosphorus oolitic hematite have caused huge difficulties in obtaining the qualified iron ore concentrates by conventional methods of mineral processing [2,3]. A coal-based direct reduction roasting process combined with magnetic separation operation [4][5][6][7] has been developed by using carbon-containing pellets of high-phosphorus oolitic hematite with coal as reductant to treat the refractory ore in recent years. In this process, the iron oxide is first reduced to a metallic iron in the roasted products also known as briquettes.…”

Section: Introductionmentioning

confidence: 99%

“…Coal slime and blast furnace dust all contain solid carbon as reductant in the direct reduction process, and they have not received effective use at the research stage due to high ash content and complex components [11][12][13][14]. Meanwhile, since the properties of the blast furnace dust and coal slime differ from coal, the dephosphorization of this process may differ from the coal's dephosphorization process that was noted above [5,6], and have a higher receptivity on reductant type from the viewpoint of phosphorus content of DRI.…”

Section: Introductionmentioning

confidence: 99%

Dephosphorization Behavior of High-Phosphorus Oolitic Hematite-Solid Waste Containing Carbon Briquettes during the Process of Direct Reduction-Magnetic Separation

Cao

Zhang

Sun

2018

Metals

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In this paper, the process of direct reduction roasting using magnetic separation to produce direct reduction iron (DRI) from high-phosphorus oolitic hematite, using coal slime and blast furnace dust as reductant, is investigated. The possible use of slime coal and blast furnace dust as reductant and the dephosphorization behavior during the process of direct reduction was studied. Experimental results showed that both blast furnace dust and coal slime can be used as reductant under certain conditions in the process. The dephosphorization mechanism of blast furnace dust and coal slime were investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM)-energy dispersive X-ray spectroscopy (EDS). A DRI with 91.88 wt. % iron grade, 88.38% iron recovery and 0.072 wt. % P can be obtained with 30 wt. % blast furnace dust as reductant. The program not only used blast furnace dust but also recovered iron from blast furnace dust and high-phosphorus oolitic hematite. The analysis results revealed that phosphorus is distributed in gangue mineral and fluorapatite when blast furnace dust is used as reductant. Phosphorus-bearing minerals were not reduced to phosphorus element when the blast furnace dust was the reductant, but part of the fluorapatite reduced to phosphorus which smelt into metallic iron with coal slime as reductant. This led to a high phosphorus content of DRI. This research could provide support to the idea concept for recycling of carbon-containing solid waste and to assist the effective recovery of refractory iron ore by direct reduction–magnetic separation.

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Growth Kinetics of Metallic Iron Phase in Coal-based Reduction of Oolitic Iron Ore

Cited by 15 publications

References 32 publications

Influence of Hot Plastic Deformation in γ and (γ + α) Area on the Structure and Mechanical Properties of High-Strength Low-Alloy (HSLA) Steel

Influence of Hot Plastic Deformation in γ and (γ + α) Area on the Structure and Mechanical Properties of High-Strength Low-Alloy (HSLA) Steel

Reduction Mechanism and Kinetics of a Low Grade Iron Ore-coal Composite Pellets Improved by Sodium Salt

Dephosphorization Behavior of High-Phosphorus Oolitic Hematite-Solid Waste Containing Carbon Briquettes during the Process of Direct Reduction-Magnetic Separation

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