High temperature reduction and softening properties of pellets with magnesite.

Sugiyama, Takeshi; Shirouchi, Shoji; Tsuchiya, Osamu; Onoda, Mamoru; Fujita, Isao

doi:10.2355/isijinternational1966.23.153

Cited by 21 publications

(7 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The weakness in the studies with pre-reduced samples is that the heat treatment is not carried out simultaneously with the reduction, as in a blast furnace. Another weakness is that some softening studies comprise only an individual pellet 16,17) or a couple of pellets 2,3,[9][10][11][12][13][14][15]18) instead of a packed bed of pellets. 7,8,[19][20][21][22][23][24][25][26][27][28][29][30] Studies 2,7,[21][22][23][24][25][26][27][28][29] have been carried out for iron ore pellets under load dynamically from ambient temperature to elevated temperatures using a simulated BF gas.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the Reduction-Softening Behaviour of Blast Furnace Burden with an Advanced Test

et al. 2016

View full text Add to dashboard Cite

A ferrous burden loses its permeability in the cohesive zone of a Blast Furnace (BF), where the iron burden materials soften and melt. A tailor-made, high-temperature furnace named ARUL (Advanced Reduction under Load) was used here to study the reduction-softening behaviour of acid and olivine pellets and basic sinter under simulated BF gas, temperature and pressure conditions.The ARUL test showed the best reduction-softening properties for the basic sinter. The sinter sample resisted up to 1 329°C and achieved a reduction degree of 90.2% until a gas-impermeable structure was formed in a packed bed, whereas the acid pellet lost its permeability at 1 160°C and only reduced to a reduction degree of 48.7%. The olivine pellet had intermediate reduction-softening properties with a final temperature of 1 252°C and a final reduction degree of 68.7%. The differences between the test materials were assessed as being caused mainly by different chemistry, but it was also revealed that the sinter sample remained its macro-porosity markedly better in relation to the pellets, providing routes for reducing gases.The experimental results were compared to the phase diagrams calculated with the computational thermodynamic software FactSage. Phase diagrams for the 5-component FeO-SiO 2 -CaO-MgO-Al 2 O 3 systems with constant CaO, MgO and Al 2 O 3 contents were used to estimate the formation of liquid phases in the test materials. The computed phase diagrams gave an estimate of the liquid formation; however, some limitations were also found in the utilization of the computations because of the need to define the system in certain simplicity.

show abstract

Section: Introductionmentioning

confidence: 99%

Evaluating the Reduction-Softening Behaviour of Blast Furnace Burden with an Advanced Test

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Já a equação (3) mostra o efeito amplificado da B 3 na temperatura de amolecimento para pelotas com basicidade ternária acima de 1.Isso indica que o aumento nos teores de CaO e MgO retardam o amolecimento da pelota. De acordo com estudos publicados ao longo das últimas décadas [5], [8], [9] , concluiu-se que pelotas básicas se caracterizam por possuírem altas temperaturas de amolecimento.…”

Section: Ensaios De Amolecimento E Fusãounclassified

Avaliação Das Propriedades De Amolecimento E Fusão De Pelotas Ácidas E Básicas

Silva¹,

Lemos²,

Nogueira³

2018

ABM Proceedings

View full text Add to dashboard Cite

Resumo Esse trabalho foi conduzido em laboratórios metalúrgicos objetivando um estudo aprofundado dos fenômenos ocorridos em altas temperaturas entre a carga metálica, carga redutora e os gases ascendentes. Através de técnicas modernas em equipamentos sofisticados foi possível avaliar o comportamento de pelotas de minério de ferro com qualidade química distintas em altas temperaturas. Esse estudo possibilitou um melhor entendimento do impacto da mudança de composição química dessas pelotas em certos parâmetros metalúrgicos, como temperatura de amolecimento e grau de redução da carga metálica. O resultado desse estudo foi uma avaliação quantitativa do efeito da basicidade ternária das pelotas, nas propriedades a quente desse tipo de produto, possibilitando estimar possíveis impactos da mudança de composição química da carga metálica na zona de amolecimento e fusão do alto-forno. Palavras-chave:Amolecimento; Fusão; Pelotas; Alto-Forno.

show abstract

“…Some studies have been published on the reduction softening of sinters and pellets [2,3]. Liu et al investigated the effect of high temperature interaction between sinter and lump ore on the formation behavior of primary-slags, and found that it improved the primary-slags formation behavior of integrated burdens [4].…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Reduction and Melting Mechanism of Sinter with Different MgO Content

Guo

Shen

Zhang

et al. 2019

Metals

View full text Add to dashboard Cite

Adding MgO to sinter is considered to be a popular counter measure to cope with the use of high Al2O3 ores. The purpose of this paper is to investigate the effect of the MgO content on the reduction melting behavior in order to clarify the main mechanism of melting and dripping under simulated blast furnace (BF) conditions. It was found that reduction behavior was inhibited with an increased MgO content; the reduction mechanism was further investigated by means of XRD, SEM, and kinetic analysis. The influence of MgO on the melting mechanism of high basicity sinter was also studied. The softening start temperature and softening temperature increased, and the softening zone increased as a whole with the increased MgO contents from 1.3 to 2.0 wt%. The melting temperature was similar, because the MgO remained in an unslagged state and existed in wustite as FeO-MgO solid solution. The dripping temperature was increased; the main reason for this was that high melting-point slags appeared, and that it was more difficult for carburization to occur with increased MgO content. The most appropriate MgO content in the sinter was 1.3 wt% according to principal component analysis (PCA).

show abstract

High temperature reduction and softening properties of pellets with magnesite.

Cited by 21 publications

References 0 publications

Evaluating the Reduction-Softening Behaviour of Blast Furnace Burden with an Advanced Test

Evaluating the Reduction-Softening Behaviour of Blast Furnace Burden with an Advanced Test

Avaliação Das Propriedades De Amolecimento E Fusão De Pelotas Ácidas E Básicas

High-Temperature Reduction and Melting Mechanism of Sinter with Different MgO Content

Contact Info

Product

Resources

About