Efficient synthesis of iron nanoparticles by self‐agglomeration in a fluidized bed

Li, Jun; Kong, Jing; Zhu, Qingshan; Li, Hongzhong

doi:10.1002/aic.15402

Cited by 20 publications

(3 citation statements)

References 49 publications

(52 reference statements)

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“…In addition, by adjusting the particle size distribution of the ore fine particles and preparing the fine particles into larger particles by granulation, the sticking tendency can be lowered to some extent. Q. S. Zhu et al 151,152) used the granulation method in the study of fluidized reduction of ultrafine iron oxide powder. And the synthesis of iron nanoparticles by the reduction of iron oxide nanoparticles in a fluidized bed was achieved , using the self-agglomeration treatment to prevent the de-fluidization.…”

Section: Choosing Of Proper Kind Of Orementioning

confidence: 99%

A Review on Prevention of Sticking during Fluidized Bed Reduction of Fine Iron Ore

et al. 2020

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The fluidized bed ironmaking technology has attracted the attention of many researchers for decades as a direct reduction ironmaking method with many advantages. This process has been applied as a pretreatment method in many non-blast furnace ironmaking processes. However, the sticking problem hindered its development greatly. Defining the essential cause of sticking, and fundamentally solving this problem are the key steps encountered by this process. The research works related to the prevention of sticking problem during fluidized bed reduction of fine iron ore are comprehensively summarized in this article. The causes of sticking, the influencing factors of sticking and the solution of sticking are firstly discussed, followed by the analysis on the possible development direction of future fluidized bed ironmaking technology.

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Section: Choosing Of Proper Kind Of Orementioning

confidence: 99%

A Review on Prevention of Sticking during Fluidized Bed Reduction of Fine Iron Ore

et al. 2020

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“…Our previous work has recognized that the sintering rate of nanoparticles is dependent on the reaction rate 49 . The mild reduction rate lead to the formation of self‐agglomerates with porous structure and allows self‐agglomerates to stand for the balance of interparticle forces and to overcome the sintering of agglomerates 32 .…”

Section: Resultsmentioning

confidence: 99%

Relationship between reaction and diffusion during ultrafine NiO reduction toward agglomeration fluidization

Zhu

2020

AIChE Journal

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The relationship between reaction and diffusion during ultrafine NiO reduction by H2 in a fluidized bed reactor were investigated. The result illuminates that the reduction reaction proceeding in the unreduced NiO powders is according to the nucleation model. A modified force balance model between cohesive and collision forces incorporating grain‐boundary diffusion and reaction is proposed to predict the agglomeration behavior of ultrafine Ni during the reduction of NiO in a fluidized bed. The modified force balance model shows more precise predictions than the model without consideration of grain‐boundary diffusion. Based on the model, it is found that the core of the two‐step reduction is to decouple grain growth from reduction for achieving full conversion while retaining nanosized grain sizes.

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“…However, fluorite particles used in this process are fines with a wide particle size distribution and consist of Geldart A particles as well as lots of ultrafine Geldart C particles. As is well-known, the ultrafine particles can lead to agglomeration during the fluidization , and result in low fluidization quality, which severely hinders the industrialized process. Up to now, there are still no reports related to the successful industrialization of this process.…”

Section: Introductionmentioning

confidence: 99%

Fluidization of Cohesive Fluorite Particles at Ambient/High Temperatures and Enhancement Methods

Liu

Lin

Huang

et al. 2018

Ind. Eng. Chem. Res.

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Fluidization of fine fluorite particles, classified as Geldart A/C particles, was studied at ambient/high temperatures by experiments. Results showed that fine fluorite particles could not be fully fluidized at ambient temperatures, due to the agglomeration phenomenon. What’s worse, due to the great increase of van der Waals forces with the increasing temperature, the fluidization quality was further depressed and they were totally defluidized at 723 K unless the loose gases were used during the heating process. In order to improve the fluidization quality, an enhancement method of adding cohesive calcium sulfate particles was established. The best improvements at ambient/high temperatures both appeared when the addition fraction was 20 wt %. Moreover, theoretical analysis showed that the effect mechanism of a calcium sulfate particle was the “coordination” theory. According to the “coordination” theory, the optimum addition fraction of calcium sulfate particles was calculated as 16.5 wt %–22.4 wt %, which agreed well with the experimental results.

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Efficient synthesis of iron nanoparticles by self‐agglomeration in a fluidized bed

Cited by 20 publications

References 49 publications

A Review on Prevention of Sticking during Fluidized Bed Reduction of Fine Iron Ore

A Review on Prevention of Sticking during Fluidized Bed Reduction of Fine Iron Ore

Relationship between reaction and diffusion during ultrafine NiO reduction toward agglomeration fluidization

Fluidization of Cohesive Fluorite Particles at Ambient/High Temperatures and Enhancement Methods

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