Effect of slag composition on iron nuggets formation from carbon composite pellets

Nogueira, Alberto Eloy Anduze; Mourão, Marcelo Breda; Takano, Cyro; Santos, Dener Martins dos

doi:10.1590/s1516-14392010000200012

Cited by 19 publications

(11 citation statements)

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“…9) Meanwhile, comprehensive studies on carbon composite agglomerate (CCA) used for ITmk3 ® -Midrex process have been carried out from the view point of carburization, metallization and effect of slags. 10,11) In CCA system, iron oxide reduction and iron melting were much improved by Fe-C melt due to the faster mass transport according to Kim et al,12,13) The role of slag on melting and separation of iron was also clarified from the previous studies. 14,15) However, reduction behavior of carbon composite pellet specifically the influence of slag composition is not well understood yet.…”

Section: Introductionmentioning

confidence: 99%

Reduction Behavior of Carbon Composite Pellets Including Alumina and Silica at 1273 K and 1373 K

Park

Sahajwalla

2014

ISIJ Int.

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The effect of alumina and silica on the reaction behavior of carbon composite pellet was investigated by thermogravimetric analysis at 1 273 K (1 000°C) and 1 373 K (1 100°C). X-ray diffraction was used for the phase analysis of iron oxide changing from hematite to reduced iron. The overall reaction was divided into three stages according to phase transformation of iron oxide. CO and CO2 from off-gas data was used for kinetic analysis and for understanding reaction mechanism. The Boudouard reaction was largely influenced by alumina and silica that changed CO gas concentration resulting in different reduction behavior of the pellets. Alumina increased the reaction rate of carbon composite pellet while silica decreased the overall reaction rate.

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Section: Introductionmentioning

confidence: 99%

Reduction Behavior of Carbon Composite Pellets Including Alumina and Silica at 1273 K and 1373 K

Park

Sahajwalla

2014

ISIJ Int.

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“…Elas consistem de uma mistura de carvão e minério de ferro com adição de pós fluxantes, pelotizadas com um aglomerante, que pode ser orgânico ou inorgânico. A vantagem em relação aos métodos tradicionais é a melhoria da cinética de reação entre a partícula de óxido de ferro e a de carvão [6]. No caso do carvão possuir um elevado teor de cinzas, isto pode ser reduzido por moagem seguido de um processo de flotação.…”

Section: Introductionunclassified

Produção De Pelotas Auto-Redutoras a Partir De Lixo Orgânico Doméstico

Nogueira¹,

Takanor²,

Mourão³

et al. 2017

Anais Dos Seminários De Redução, Minério De Ferro E Aglomeração

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ResumoO lixo orgânico doméstico gera um problema de eliminação crescente, exigindo sistemas de processamento dispendiosos. É necessário encontrar novas aplicações para estes resíduos; uma poderia ser como matéria prima metalúrgica. Neste trabalho é estudado o desenvolvimento de pelotas auto-redutoras usando a pirólise de resíduos orgânicos, onde é gerado carbono e voláteis condensáveis e não condensáveis. O alcatrão resultante foi misturado com minério de ferro, pó de carvão e fluxante (CaO), para produzir as pelotas. O carvão fluidizado cria uma forte aderência dos elementos, mostrando uma boa viabilidade do presente processo. Palavras-chave: Auto-redução; Resíduos orgânicos; Pirólise; Alcatrão. THE SELF-REDUCING PELLET PRODUCTION FROM ORGANIC HOUSEHOLD WASTE AbstractThe domestic organic waste disposal generates an increasing problem requiring expensive processing systems. It is necessary to find new applications for these wastes; one could be as metallurgical raw material. This paper examines the development of self-reducing pellets using pyrolysis of organic waste, which generated carbon and condensable and non-condensable volatile. The resulting tar was mixed with iron ore, coal powder and flux (CaO) to produce pellets. The fluidized coal creates a strong grip of the elements, showing a good feasibility of this process.

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“…Consequently, the coal-based CCA reduction behaviors with the slag composition 'a', 'b' and 'c' have been well studied. [6][7][8][9][10] However, these slag compositions are not suitable © 2014 ISIJ for high Al2O3 iron ore due to the increase of slag volume. Thus, to effectively and extensively use high Al2O3-containing iron ores with CCA reduction process, alternative slag design must be developed.…”

Section: Introductionmentioning

confidence: 99%

“…These steps with the slag region 'a', 'b' and 'c' have been already studied. [6][7][8]12) Ohno et al 6) investigated the effect of metal-slag separation based on slag melting temperatures and viscosities with slag region 'b' and 'c'. Nogueira et al 7) also observed clear metal-slag separation behavior with slag 'a'.…”

Section: Introductionmentioning

confidence: 99%

“…[6][7][8]12) Ohno et al 6) investigated the effect of metal-slag separation based on slag melting temperatures and viscosities with slag region 'b' and 'c'. Nogueira et al 7) also observed clear metal-slag separation behavior with slag 'a'. Kim et al 8,12) studied the role of liquid phase on the metal-slag wetting/ separation behavior in the slag composition 'a' based on insitu confocal laser-scanning microscope (CLSM) observation.…”

Section: Introductionmentioning

confidence: 99%

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Metal-slag Separation Behaviors of Pellets Consisted of Iron, Graphite and CaO–Al2O3 Based Slag Powders

et al. 2014

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In-situ observations of metal-slag separation behaviors between CaO-Al2O3 based slag, iron and graphite powder mixed pellets by a confocal laser-scanning microscope (CLSM) have been carried out to find the effective way to use high Al2O3 iron ore in CCA reduction processes. Since a particular type of high Al2O3 iron ore such as laterite contains small amount of NiO and Cr2O3, the effect of NiO and Cr2O3 on the metal-slag separation behaviors were also studied. The observed metal-slag separation behaviors were analyzed based on the equilibrium phase fractions calculated by FactSage and carbon diffusion simulation in an iron sphere particle with a spot carbon source condition. Based on these in-situ observations and carbon diffusion results, starting temperature of metal-slag separation was found to correspond to the eutectic temperature of CaO-Al2O3 based slag. The iron carburization was initiated by slag melting and most of iron particles were melted within about 20 s after slag melting. The rapid carburization after slag melting was introduced by the good wettability between solid iron and molten slag. NiO and Cr2O3 additions did not change the fundamental behaviors of metal-slag separation at least up to about 3 mass%. Based on these results, it was confirmed that high Al2O3 content iron ore can be used in CCA reduction process by using CaO-Al2O3 based slag.KEY WORDS: metal-slag separation; high Al2O3 iron ore; iron carburization; spot source diffusion; CaOAl2O3 based slag.

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Effect of slag composition on iron nuggets formation from carbon composite pellets

Cited by 19 publications

References 4 publications

Reduction Behavior of Carbon Composite Pellets Including Alumina and Silica at 1273 K and 1373 K

Reduction Behavior of Carbon Composite Pellets Including Alumina and Silica at 1273 K and 1373 K

Produção De Pelotas Auto-Redutoras a Partir De Lixo Orgânico Doméstico

Metal-slag Separation Behaviors of Pellets Consisted of Iron, Graphite and CaO–Al2O3 Based Slag Powders

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