GASEOUS REDUCTION BEHAVIOR OF IRON OXIDE IN MINERAL PHASES AND IN CaO-SiO<sub>2</sub>-FeO SLAG POWDER

Ono-Nakazato, Hideki; Usui, Tateo; Kitamura, Nobufumi; Tsubone, Youhei

doi:10.1080/714856825

Cited by 11 publications

(6 citation statements)

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“…These materials tend to soften and bond the particles. 33,70) This phenomenon generally occurs after the FeO phase has been reduced. Softening of the surface of the particles at higher temperatures promotes plastic deformation on the surface of the particles, which increases the contact area during the collision between particles, further promoting the occurrence of bonding phenomena.…”

Section: The Effect Of Compounds Of Low Melting Pointmentioning

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: The Effect Of Compounds Of Low Melting Pointmentioning

confidence: 99%

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

et al. 2020

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“…Reduction mechanisms of iron oxide in the slag system have been studied extensively. [8][9][10][11][12][13] Oxygen within the air blown to the furnace also forms CO by reacting with carbon in the cokes.…”

Section: +C=3feo+co (3) Feo+co=fe+co 2 and Feo+c=fe+comentioning

confidence: 99%

In-Situ Observation of Fe0.94O Reduction at High Temperature with the Use of Optical Microscopy

Yamashita

Nakada

Nagata

2007

Metall Mater Trans B

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TORU YAMASHITA, TOMOYA NAKADA, and KAZUHIRO NAGATA Highly (l00) oriented Fe 0.94 O, when physically contacted with graphite, is reduced in various CO partial pressures at isothermal temperatures between 1173 and 1473 K. The reducing behaviors were studied in situ using optical microscopy. The results indicated that the reduction of FeO+CO fi Fe+CO 2 took place anywhere on the surface of the Fe 0.94 O at temperatures above 1173 K. The reaction did not start nor spread from the point where the Fe 0.94 O-graphite were in physical contact. The moving rate of the Fe/Fe 0.94 O interface is classified into three regions (as a function of P CO and also temperature): the slow moving region at low temperatures; the stepwise moving region at medium temperatures and low P CO ; and the constant and fast moving region at high P CO or high temperatures.

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“…The third type of sticking can occur at a temperature above 1123 K because of the generation of low melting eutectica between wüstite and gangue components of the iron ore [ 29 , 52 , 69 ]. As a result, the particles become soft and tend to bond.…”

Section: Influence Of the Reduction Process On The Fluidization Behaviormentioning

confidence: 99%

Analysis of the Usability of Iron Ore Ultra-Fines for Hydrogen-Based Fluidized Bed Direct Reduction—A Review

Wolfinger¹,

Spreitzer

Schenk

2022

Materials

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This review focuses on the usability of iron ore ultra-fines for hydrogen-based direct reduction. Such technology is driven by the need to lower CO2 emissions and energy consumption for the iron and steel industry. In addition, low operational and capital expenditures and a high oxide yield because of the direct use of ultra-fines can be highlighted. The classification of powders for a fluidized bed are reviewed. Fluid dynamics, such as minimum fluidization velocity, entrainment velocity and fluidized state diagrams are summarized and discussed regarding the processing of iron ore ultra-fines in a fluidized bed. The influence of the reduction process, especially the agglomeration phenomenon sticking, is evaluated. Thus, the sticking determining factors and the solutions to avoid sticking are reviewed and discussed. The essential theoretical considerations and process-relevant issues are provided for the usability of iron ore ultra-fines for hydrogen-based fluidized bed direct reduction.

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GASEOUS REDUCTION BEHAVIOR OF IRON OXIDE IN MINERAL PHASES AND IN CaO-SiO₂-FeO SLAG POWDER

Cited by 11 publications

References 0 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

In-Situ Observation of Fe0.94O Reduction at High Temperature with the Use of Optical Microscopy

Analysis of the Usability of Iron Ore Ultra-Fines for Hydrogen-Based Fluidized Bed Direct Reduction—A Review

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GASEOUS REDUCTION BEHAVIOR OF IRON OXIDE IN MINERAL PHASES AND IN CaO-SiO2-FeO SLAG POWDER

Cited by 11 publications

References 0 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

In-Situ Observation of Fe0.94O Reduction at High Temperature with the Use of Optical Microscopy

Analysis of the Usability of Iron Ore Ultra-Fines for Hydrogen-Based Fluidized Bed Direct Reduction—A Review

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GASEOUS REDUCTION BEHAVIOR OF IRON OXIDE IN MINERAL PHASES AND IN CaO-SiO₂-FeO SLAG POWDER