Growth of metallic iron particles during reductive roasting of boron-bearing magnetite concentrate

Zhang, Xin; Li, Guanghui; Rao, Mingjun; Mi, Huanpeng; Liang, Binjun; You, Jinxiang; Peng, Zhiwei; Jiang, Tao

doi:10.1007/s11771-020-4384-0

Cited by 12 publications

(3 citation statements)

References 21 publications

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“…The residence time of the iron grain at the reaction interface and the probability of producing larger iron granules increased. In the later stage, the concentration of 2FeO•SiO 2 diffused to the reaction interface further decreased, resulting in a smaller particle size of metallic iron at the reaction interface [18,21,27]. Moreover, many small iron granules appeared on the surface of the slag at the end of the reduction reaction owing to the increase of the slag viscosity and the slower falling speed.…”

Section: Metallic Phase Growth Process and Description Of Limiting Linksmentioning

confidence: 99%

“…The coal-based reduction results were obtained using the optical image analysis to measure the metallic iron granularity of the reduction products [14,19]. The average iron size increased with the reduction time and reduction temperature [16,20,21]. The distribution of metallic iron grain followed the exponential decay function (frequency distribution) and the Rosin-Rammler equation (cumulative distribution), respectively [17,22].…”

Section: Introductionmentioning

confidence: 99%

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The Growth Characteristics and Kinetics of Metallic Iron in Coal-Based Reduction of Jinchuan Ferronickel Slag

Qin

Gao

et al. 2021

Minerals

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As the fourth-largest industry waste residue, after iron slag, steel slag, and red mud, in China, the comprehensive utilization of nickel slag is imminent. Coal-based reduction combined with magnetic separation was considered an efficient method to extract iron from nickel slag. During the coal-based reduction of Jinchuan ferronickel slag, the growth characteristics and kinetics of metallic iron were investigated in this paper. The metallisation rate and metal iron grain size gradually increased with the reduction temperature or the reaction time, and the coal-based reduction process was divided into the rapid formation period and the aggregation growth period of the metallic phase. The granularity distribution of metallic iron obeyed the Doseresp sigmoidal function, and the activation energy of grain growth at different stages were 52.482 ± 4.448 kJ·mol−1 and 26.426 ± 3.295 kJ·mol−1, respectively. Meanwhile, a mathematical growth model of the metallic iron grains was also established.

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Section: Metallic Phase Growth Process and Description Of Limiting Linksmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Growth Characteristics and Kinetics of Metallic Iron in Coal-Based Reduction of Jinchuan Ferronickel Slag

Qin

Gao

et al. 2021

Minerals

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“…The reduction kinetics of the boron-bearing iron concentrate/coal composite pellets shows that the rate-limiting step was carbon gasification at 1000–1150 °C, whereas the reduction was controlled by interfacial chemical reactions at 1150–1300 °C . To achieve the metallization of boron-bearing iron concentrate, the reaction temperature exceeds 1050 °C and the reduction time is more than 1–3 h under laboratory conditions. − Therefore, the problematic aspects of reducing boron-bearing iron concentrate with coal are high reduction temperatures, energy consumption, and CO 2 emissions. With the continued global focus on carbon neutrality, the iron and steel industry strives to find alternative processes to coal-based reduction .…”

Section: Introductionmentioning

confidence: 99%

Fluidized Reduction Kinetics of Boron-Bearing Iron Concentrate by Hydrogen at Low Temperatures Based on Model-Fitting and Model-Free Methods

Li,

Yu,

et al. 2024

ACS Omega

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Pyrometallurgy is the most effective way to comprehensively utilize boron-bearing iron concentrate, and there is an urgency for an environmentally friendly and efficient method to achieve the prereduction of boron-bearing iron concentrate. In this study, the mechanism and kinetics of isothermal hydrogen reduction of boron-bearing iron concentrate in a fluidized bed at 500–570 °C were discussed. The reduction degree was quantified in combination with the online gas composition analysis technique, and the phase and microstructure of the reduced products were characterized. The results exhibited that the apparent activation energy remained constant during the whole reduction process, with average values of 50.67 and 48.08 kJ/mol calculated by the model-free and model-fitting methods, respectively, and the reaction was controlled by the contracting sphere model. The formation of a microporous metallic iron facilitated the rapid penetration of hydrogen to the reaction interface. Therefore, the intrinsic chemical reaction at the interface determined the whole reaction process.

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Research on efficient utilization of high-phosphorus oolitic hematite for iron enrichment and dephosphorization by hydrogen mineral phase transformation

Ding,

Yuan,

Gao

et al. 2023

J. Cent. South Univ.

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Growth of metallic iron particles during reductive roasting of boron-bearing magnetite concentrate

Cited by 12 publications

References 21 publications

The Growth Characteristics and Kinetics of Metallic Iron in Coal-Based Reduction of Jinchuan Ferronickel Slag

The Growth Characteristics and Kinetics of Metallic Iron in Coal-Based Reduction of Jinchuan Ferronickel Slag

Fluidized Reduction Kinetics of Boron-Bearing Iron Concentrate by Hydrogen at Low Temperatures Based on Model-Fitting and Model-Free Methods

Research on efficient utilization of high-phosphorus oolitic hematite for iron enrichment and dephosphorization by hydrogen mineral phase transformation

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