Injection de minerai au haut fourneau et maîtrise de la teneur en silicium

Brun, G.; Nicolle, R.; Steiler, J.M.; Bouttement, J.L.; Eymond, J.L.; Menaut, J.P.

doi:10.1051/metal/198885010021

Cited by 2 publications

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“…The CO 2 evolution starts at 250°C. At approximately 300°C, hydrocarbons (CH 4 , C x H y ) are detected indicating that volatile matter is released. The maximum of the peak corresponding to H 2 occurs at ϳ600°C and this peak coincides with an endothermic peak.…”

Section: Results Of Dta/tgmentioning

confidence: 99%

“…Multi-injection has also been considered for different reasons. The injection of basic fluxes or iron oxide has been tested to decrease the silicon content of hot metal [1][2][3][4][5][6][7] and to improve slag formation. 8,9) Additionally, the injection of different by-products has been evaluated for re-use of valuable components as well as to decrease the landfill.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of BOF Slag and BF Flue Dust on Coal Combustion Efficiency

et al. 2004

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Injection into a BF of BOF slag to improve the slag formation and of BF flue dust to improve the recycling of in-plant fines has previously been tested. The effects on the PC combustion efficiency at different conditions, when these materials are co-injected with coal, have so far not been tested. Combustion efficiencies at varied temperature, O 2 enrichment, amount of PC, amount of added BOF slag or BF flue dust and particle size of the added material are measured in a fixed bed and a blowpipe model. The established facts that an increased temperature and O 2 enrichment or a decreased amount of coal increase the combustion efficiency are valid also when BOF slag or BF flue dust are added to the coal. By adjusting the combustion conditions, a decreased combustion efficiency can be counteracted, when a second material is co-injected with coal. The effect of BOF slag addition on coal combustion efficiency measured in the blowpipe model is insignificant, if a fine fraction is used. The combustion efficiency is higher in the fixed bed compared with that in the blowpipe model. The addition of BF flue dust increases the combustion efficiency in the fixed bed.

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Section: Results Of Dta/tgmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Effect of BOF Slag and BF Flue Dust on Coal Combustion Efficiency

et al. 2004

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“…The oxidation degree of the slag in the hearth and bosh was considered to be a key factor controlling Si content of hot metal. 7) The different results achieved in the iron ore injection studies might be explained by the particle size of the injected iron ore.…”

Section: )mentioning

confidence: 99%

“…2,3) Injection of iron ore and different fluxes has been tested in some blast furnaces to adjust the sulphur and silicon contents of hot metal. [4][5][6][7][8] In a study concerning the effect of tuyere injection of dolomite on the Si content of hot metal it was found that the increased MgO content of the tuyere slag decreased the SiO 2 activity in the slag and the generation of SiO gas decreased. The effect of MgO on the generation of SiO gas decreased with increased basicity B2 of the slag.…”

Section: )mentioning

confidence: 99%

The Melting Properties of Tuyere Slags with and without Flux Injection into the Blast Furnace.

Ökvist

2001

ISIJ International

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A laboratory study concerning the melting properties of tuyere slags has been conducted. The meltingpoint measurements of various specimens, consisting of coke ash, coal ash and fluxes (BOF slag, burnt lime and burnt dolomite), corresponding to the tuyere slags formed in front of the tuyeres with or without flux injection, have been performed in a high-temperature microscope. Theoretical estimations of melting points have been made based on the chemical composition of the tuyere slag specimens.The results have shown that injection of fluxes has quite a positive effect on the melting properties of the tuyere slag. The melting point of the tuyere slag decreases and the temperature interval between softening and complete melting of the tuyere slag becomes narrower. Compared to the injection of burnt lime and burnt dolomite, the injection of BOF slag will result in still better tuyere slag properties in terms of lower flow point and narrower temperature interval between softening and melting. The differences in melting behaviour in the tuyere slag specimens indicate that injection of BOF slag will also give the tuyere slag a lower viscosity compared to injection of burnt lime or burnt dolomite at the same levels of slag basicity B2.KEY WORDS: flux injection; tuyere slag; melting-point measurements.powder mixture of flux and iron ore did decrease the Si content. The positive effect of flux powder was explained by SiO absorption by the flux powder. 5) In another study on injection of iron ore fines it was found that the Si content was decreased as a result of increased partial pressure of oxygen in the end of the raceway. If sinter fines containing CaO was used the effect was higher. 6) In another study of the injection, a mixture of iron ore and coal or a water slurry containing iron ore resulted in decreased Si content of hot metal. The oxidation degree of the slag in the hearth and bosh was considered to be a key factor controlling Si content of hot metal.7) The different results achieved in the iron ore injection studies might be explained by the particle size of the injected iron ore.8) The original oxidation degree of slags in the bosh and the hearth will affect the result. 5)When a very fine grain size of iron ore is used, the reduction in the raceway will be efficient and the amount of residual FeO limited.The use of injection of flux via tuyeres in order to obtain smooth slag formation in the blast furnace results in a decrease in the volume of bosh slag and prevents the formation of a bosh slag with excessive basicity.1-3) At normal blast furnace operation, the tuyere slag, formed by the ash content in fuels combusted in front of the tuyeres, is very acidic and has a high viscosity. The injection of fluxes via the tuyeres makes it possible to increase the basicity of the tuyere slag to an appropriate level and improve its melting properties. A lower tuyere slag viscosity might improve the drainage of the slag through the voids in the coke bed. 9,10) The aim of this laboratory study is to determine the influe...

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Injection de minerai au haut fourneau et maîtrise de la teneur en silicium

Cited by 2 publications

References 0 publications

The Effect of BOF Slag and BF Flue Dust on Coal Combustion Efficiency

The Effect of BOF Slag and BF Flue Dust on Coal Combustion Efficiency

The Melting Properties of Tuyere Slags with and without Flux Injection into the Blast Furnace.

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