Low Silicon Operation in Blast Furnace with Flux Injection through the Tuyeres

Nakajima, Ryuichi; Kishimoto, Sumiyuki; Hotta, Hirohisa; Simomura, Akio; Ishii, Kunihiko; Yamaoka, Yojiro

doi:10.2355/tetsutohagane1955.76.6_832

Cited by 6 publications

(6 citation statements)

References 2 publications

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“…The slag formation will be greatly optimised, almost reaching to an ideal condition. In addition, it might also bring some additional advantages to the blast furnace operation, such as improving desulphurisation in front of the tuyeres and providing an efficient tool for controlling Si content in hot metal, as proposed and tested in several companies,4 7) which are needed especially for the blast furnace operated with a very low slag volume.…”

Section: Introductionmentioning

confidence: 99%

Injection of Flux into the Blast Furnace via Tuyeres for Optimising Slag Formation.

1999

ISIJ International

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E-mai l: J itang. Ma@km, Iuth,se Based on discussion of the slag formation problems occurred during a commercial sca[e blast furnace test of I OO'/• high Fe-content self-fluxed pellets, a proposal of replacing the charge of flux from the top by injection via tuyeres has been presented. It will optimise the slag formation process and provide a great potential of further increase productivity with smooth operation due to: I ) decrease bosh slag volume significantly;2) obtain even and proper basicities of primary slag, bosh slag, tuyere slag and final slag formed along the height the blast furnace.KEYWORDS: Ironmaking; flux injection; slag formation; cohesive zone; fluxed pellets.l. IntroductionThe blast furnace ironmaking is a hlgh temperature reduction process transforming solid iron oxides to a liquid product of hot metal. In order to get a smooth operation with high productivity and goodquality of hot metal, an appropriate slag formation, dissolution of gangue contained in iron ores and of ash in fuel(s) as well as the components in fiuxes into a liquld slag with desired properties, needs to be made. It is well known that slag volume and slag properties have significant influence on the operation, the cohesive zone has been considered as a critical zone in the blast furnace.In the past few decades, tremendous efforts of improving the quality of raw materials

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Section: Introductionmentioning

confidence: 99%

Injection of Flux into the Blast Furnace via Tuyeres for Optimising Slag Formation.

1999

ISIJ International

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“…En el HA-2 de Keihin Steel Works (Nippon Kokan) se investigó sobre este aspecto (26). El fundente (CaO, MgO) se inyectó por tobera a través de una lanza junto con el viento caliente (1.000 °C).…”

Section: Inyección Simultánea De Cp Y Fundentesunclassified

“…Otro procedimiento alternativo para evitar en lo posible la adherencia del fundente no fundido a la superficie de la carga es inyectar el fundente por tobera en un régimen intermitente, o sea el caudal de fundente aumenta o disminuye periódicamente (27). En este caso, el fundente no fundido adherido a la carga en el período de inyección, se funde durante los períodos de interrupción de la inyección, lo que permite mejorar la permeabilidad a los gases en la parte inferior del horno.…”

Section: Inyección Simultánea De Cp Y Fundentesunclassified

Tecnología de fabricación de arrabio con inyección de combustibles y otros materiales por toberas en el horno alto. III parte. Inyección de mezclas combustibles y otros materiales no combustibles

García¹,

Cores²,

Formoso³

et al. 1998

REVMETAL

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“…In the researches and developments on the injection of flux for the reduction of silicon in molten iron carried out between the latter half of the 1980s and the early 1990s, [11][12][13][14][15][16][17][18] basic fluxes primarily comprising of CaO and MgO and high-FeO fluxes were blown in through tuyeres. The research and development discussed here deals with studies and measurements carried out with attention focused on the melting property of the flux and the temperature near the raceway.…”

Section: Mechanism Of Deadman Inactivation and Choice Of Flux For Injmentioning

confidence: 99%

Activation of Deadman State in the Blast Furnace Using Serpentine Injection through Tuyere

et al. 2004

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In the injection test of serpentine through one tuyere executed as a means to improve the furnace lower filling structure, the tuyere sampler insertion depth and the deadman temperature rose greatly by the amount of the fine serpentine injection of 20 kg/t or more. It is presumed for the melting point of slag piling up in the deadman surface part to decrease by the injection of fine serpentine through tuyere, for the fine ratio (Ϫ3 mm) of the melt origin and a slag hold-up ratio to decrease greatly, and for the gas and liquid permeabilities in deadman to have been improved. In addition, the possibility that the desulfurization reaction is able to be promoted efficiently while maintaining the active state of deadman and the possibility of the low temperature operation by the serpentine injection through tuyere were suggested.

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Low Silicon Operation in Blast Furnace with Flux Injection through the Tuyeres

Cited by 6 publications

References 2 publications

Injection of Flux into the Blast Furnace via Tuyeres for Optimising Slag Formation.

Injection of Flux into the Blast Furnace via Tuyeres for Optimising Slag Formation.

Tecnología de fabricación de arrabio con inyección de combustibles y otros materiales por toberas en el horno alto. III parte. Inyección de mezclas combustibles y otros materiales no combustibles

Activation of Deadman State in the Blast Furnace Using Serpentine Injection through Tuyere

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