Metallization of Extruded Briquettes (BREX) in Midrex Process

Bizhanov, Aitber; Malysheva, T. Ya.

doi:10.3390/met7070259

Cited by 5 publications

(3 citation statements)

References 4 publications

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“…It can significantly reduce pollutant emissions and realize clean production, representing a feasible innovative green ironmaking technology with low environmental emissions. However, in the process of the high-temperature fluidized reduction of iron ore powder, sticking loss may occur more easily, reducing the reduction efficiency and hindering the continuous operation of the process [6][7][8][9][10]. This has become the most important obstacle for the industrialized application of fluidized iron smelting technology.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Pressurized Decarbonization of CO on Inhibiting the Adhesion of Fine Iron Ore Particles

Liu

et al. 2018

Metals

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In this research, Australian fine iron ore is reduced by pressured carbon monoxide in a fluidized bed. This research aims to obtain the influence law of gas linear velocity, reduction pressure, reduction temperature, particle size, and reduction time on the reduction effect and the economic, convenient, and effective operating parameters, as well as clarify the effect of the pressurized decarbonization of CO, which inhibits the adhesion of fine iron ore particles during the reduction process. The experimental results show that the preferable operating parameters are a linear velocity of 0.8 m/s, reduction pressure of 0.2 MPa, reduction temperature of 1023 K, and particle size of 0.18 mm-0.66 mm. The graphite produced by the carbon precipitation reaction of carbon monoxide hinders the diffusion of iron atoms and avoids the direct contact between the iron atoms, thereby effectively controlling the sticking.

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Section: Introductionmentioning

confidence: 99%

The Effect of Pressurized Decarbonization of CO on Inhibiting the Adhesion of Fine Iron Ore Particles

Liu

et al. 2018

Metals

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“…The occurrence states of carbons deposited from waste plastics can be divided into two types: graphite and carbon from Fe 3 C. Carbon from Fe 3 C reduces the sticking of fine iron ore, while the graphite hinders the direct contact of iron atoms, thereby effectively controlling the sticking.added are mainly oxides, such as CaO, MgO, SiO 2 , and Al 2 O 3 . The adding methods include the dry method, powder method, water mixing method, sintering method, solution method, slurry method, and high-temperature coating method [6][7][8][9]. The addition of inert components affects the surface morphology of particles, especially the growth of iron whiskers [9].…”

mentioning

confidence: 99%

“…The adding methods include the dry method, powder method, water mixing method, sintering method, solution method, slurry method, and high-temperature coating method [6][7][8][9]. The addition of inert components affects the surface morphology of particles, especially the growth of iron whiskers [9]. Moreover, the inert components wrap the surface of slag particles or the dilution bed and reduce the probability of iron contact on the surface of particles.…”

mentioning

confidence: 99%

The Effect of Carbon Dissection of Waste Plastics on Inhibiting the Adhesion of Fine Iron Ore Particles during Hydrogen Reduction

Liu

et al. 2018

Metals

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In this research, Australian fine iron ore was reduced by combining pressurized and energy-bearing waste plastics in a fluidized bed. This research aims to obtain preferable operating parameters by synthetically researching the effect of temperature, linear velocity, pressure, size, and mass content of energetic waste plastics, and to clarify the sticking mechanism and the inhibitory mechanism of fine iron ore during the reduction process. The experimental results show that the preferable operating parameters include a reduction temperature of 923-973 K, linear velocity of 0.8 m/s, reduction pressure of 0.15 MPa, particle size of energetic waste plastics of 0.18-0.66 mm, and mass content of energetic waste plastics of 8%. Under the conditions of theses preferable operating parameters, the sticking mechanism of fine iron ore is caused by the reunion of the metal iron atoms. The occurrence states of carbons deposited from waste plastics can be divided into two types: graphite and carbon from Fe 3 C. Carbon from Fe 3 C reduces the sticking of fine iron ore, while the graphite hinders the direct contact of iron atoms, thereby effectively controlling the sticking.added are mainly oxides, such as CaO, MgO, SiO 2 , and Al 2 O 3 . The adding methods include the dry method, powder method, water mixing method, sintering method, solution method, slurry method, and high-temperature coating method [6][7][8][9]. The addition of inert components affects the surface morphology of particles, especially the growth of iron whiskers [9]. Moreover, the inert components wrap the surface of slag particles or the dilution bed and reduce the probability of iron contact on the surface of particles. Therefore, the inhibitory effect and inert ingredients' uniformity on the particle surface are related to adhesion strength.Carbon is attached to the surface of the particles through carbon precipitation and chemical reactions, and its uniformity distribution and adhesion strength are improved compared with those for the method of adding oxides [10,11]. Shi et al. [12] found that the adhesion of carbon effectively inhibits growth of iron whiskers, which are not easily generated on the surface of powder particles, thereby inhibiting sticking loss. This theory is based on the fact that powder sticking is caused by the hook of an iron whisker. However, Mikami, Zhong, and Shao et al. [13][14][15] showed that the iron whisker is not a necessary condition for the occurrence of sticking loss; pure iron powder particles can also generate sticking loss, and pure iron powder contains no iron whisker. Therefore, the mechanism of inhibition of sticking by carbon precipitation must be further studied. During non-blast furnace ironmaking, the gas-based reduction process is implemented using pressure. Many experts' studies on the mechanism of inhibiting sticking loss are mostly based on atmospheric pressure and differ from the production practice.In order to improve environmental protection and production efficiency, the current study added energetic waste pl...

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Briquetting

Bizhanov¹,

Chizhikova²

2019

Agglomeration in Metallurgy

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Metallization of Extruded Briquettes (BREX) in Midrex Process

Cited by 5 publications

References 4 publications

The Effect of Pressurized Decarbonization of CO on Inhibiting the Adhesion of Fine Iron Ore Particles

The Effect of Pressurized Decarbonization of CO on Inhibiting the Adhesion of Fine Iron Ore Particles

The Effect of Carbon Dissection of Waste Plastics on Inhibiting the Adhesion of Fine Iron Ore Particles during Hydrogen Reduction

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