Softening Behaviors of Acid and Olivine Fluxed Iron Ore Pellets in the Cohesive Zone of a Blast Furnace

Kemppainen, Antti; Ohno, Ko Ichiro; Iljana, Mikko; Mattila, Olli; Paananen, Timo; Heikkinen, Eetu Pekka; Maeda, Takayuki; Kunitomo, Kazuya; Fabritius, Timo

doi:10.2355/tetsutohagane.tetsu-2016-097

Cited by 4 publications

(3 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Geassy et al 18) studied the reduction behavior of flux pellets at 1 023-1 273 K. The results showed that the reduction rate of flux pellets was significantly higher than that of acid pellets in the early stage, and the reduction rate decreased in the later stage due to the formation of magnesia wustite. Kemppainen et al 19) studied the softening behavior of acid pellets and magnesia acid pellets. The results showed that the main reason for pellet deformation is the dissolution of the wustite phase and the separation of the wustite phase into a single wustite phase particle in the pellet.…”

Section: Effect Of Sio 2 On the Softening-melting And Dropping Behavi...mentioning

confidence: 99%

Effect of SiO2 on the Softening-Melting and Dropping Behavior of Magnesia Flux Pellets

Tian,

Jin,

Zhang

et al. 2023

ISIJ Int.

View full text Add to dashboard Cite

Section: Effect Of Sio 2 On the Softening-melting And Dropping Behavi...mentioning

confidence: 99%

Effect of SiO2 on the Softening-Melting and Dropping Behavior of Magnesia Flux Pellets

Tian,

Jin,

Zhang

et al. 2023

ISIJ Int.

View full text Add to dashboard Cite

“…To achieve efficient and stable operations under such conditions, it is important to clarify and control the phenomena in the cohesive zone. Estimations of the gas permeability, [1][2][3] melting-softening behavior, 4,5) and reduction behavior [6][7][8][9] in the cohesive zone have been the subjects of previous research. 10) According to Mori et al, 4) the initial melt formation temperature of the pellets and sinters increases with the degree of reduction.…”

Section: Introductionmentioning

confidence: 99%

Influence of CaO/SiO2 on the Reduction Behavior of Sintered Fe2O3–CaO–SiO2–Al2O3 Tablets at the Softening and Melting Temperatures

et al. 2020

View full text Add to dashboard Cite

Reduction experiments were conducted with sintered Fe 2 O 3 -CaO-SiO 2 -Al 2 O 3 tablets at (mass%CaO)/ (mass%SiO 2 ) (C/S) of 1.5, 2.0, and 2.5 at 1 000, 1 050, 1 100, 1 150, and 1 200°C. From the reduction behaviors, we investigated the relationship between the reduction rate and C/S at the softening and melting zone temperatures of blast furnaces. The reduction rates at C/S = 2.0 and 2.5 increased with temperature in the range of 1 000 to 1 200°C. The reduction rate at C/S = 1.5 increased with temperature in the range of 1 000 to 1 150°C; however, at 1 200°C, it decreased to the same value obtained at 1 000°C. The microstructures of these samples, after sintering at 1 270°C, pre-reduction at 900°C, and reduction at 1 200°C, were analyzed through SEM-EDS. Fe 2 O 3 particles, SFCA, slag, and pores among Fe 2 O 3 particles existed in the samples after sintering. The matrix components in the pre-reduced sample were suggested to be calcium silicate slag containing FeO x and Al 2 O 3 at C/S = 1.5, and to be 'FeO x ' originated from SFCA at C/S = 2.0 and 2.5. The porosity of the open pores at C/S = 1.5 decreased to 16%. It was found that the reduction rate at 1 200°C decreased due to this lower porosity. By contrast, the porosity of the open pores after reduction at C/S = 2.0 and 2.5 was much higher than that after pre-reduction. The reduction rates of these samples at 1 200°C were found to not decrease as a result of maintaining a higher porosity.

show abstract

“…The particles are coloured by their sizes. The value of load acting on the top of particles is determined 100 KPa according to the standard conditions in the softening test [48,49]. For this test case, the conversion and dynamic modulus of the XDEM are used.…”

Section: Cohesive Zonementioning

confidence: 99%

The Extented Discrete Element Method (XDEM): An Advanced Approach to Model Blast Furnace

Peters¹,

Baniasadi²,

Baniasadi³

2018

Iron Ores and Iron Oxide Materials

View full text Add to dashboard Cite

The blast furnace iron making is the oldest but still the main method to produce liquid iron through sequential reduction processes of iron ore materials. Despite the existence of several discrete and continuous numerical models, there is no global method to provide detailed information about the processes inside the furnaces. The extended discrete element method known as XDEM is an advance numerical tool based on Eulerian-Lagrangian framework which is able to cover more information about the blast furnace process. Within this platform, the continuous phases such as gas and liquid phases are coupled to the discrete entities such as coke and iron ore particles through mass, momentum and energy exchange. This method has been applied to the shaft, cohesive zone, dripping zone and hearth of the blast furnace. In this chapter, the mathematical and numerical methods implemented in the XDEM method are described, and the results are discussed.

show abstract

Softening Behaviors of Acid and Olivine Fluxed Iron Ore Pellets in the Cohesive Zone of a Blast Furnace

Cited by 4 publications

References 11 publications

Effect of SiO<sub>2</sub> on the Softening-Melting and Dropping Behavior of Magnesia Flux Pellets

Effect of SiO<sub>2</sub> on the Softening-Melting and Dropping Behavior of Magnesia Flux Pellets

Influence of CaO/SiO<sub>2</sub> on the Reduction Behavior of Sintered Fe<sub>2</sub>O<sub>3</sub>–CaO–SiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> Tablets at the Softening and Melting Temperatures

The Extented Discrete Element Method (XDEM): An Advanced Approach to Model Blast Furnace

Contact Info

Product

Resources

About