High temperature properties of by-product cold bonded pellets containing blast furnace flue dust

Robinson, Ryan

doi:10.1016/j.tca.2005.04.015

Cited by 32 publications

(19 citation statements)

References 2 publications

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“…With sufficiently long heating time, a briquette has been shown to reach a 100% RD with the self-reduction in an inert atmosphere. 10) In the present experiments these reduction steps were reached in the briquette samples containing about 10 wt-% coke with interrupted reduction experiments, which simulated the BF conditions at 480, 780 and 1 100°C, respectively. The reference pellet did not reach these reduction steps completely in the same experiments which can be explained by the direct reduction system achieved by the coke of the briquette.…”

Section: Reductionmentioning

confidence: 77%

“…(11). This reaction series has been proposed to occur approximately at 750°C by Robinson et al 10) ........ (11) …”

Section: "Wüstite" Experimentsmentioning

confidence: 96%

“…This leads to various phase transformations and metamorphosis in the briquette. 10,11) The durability of the briquette is dependent on these phase transformations, which makes the reduction behavior experiments necessary.…”

Section: Introductionmentioning

confidence: 99%

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Reduction Behavior of Cold-bonded Briquettes under Simulated Blast Furnace Conditions

et al. 2014

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Recycling of fine sized iron-rich by-products back to blast furnace (BF) process in the form of cementbonded briquettes has become a common procedure in steel plants. Replacing part of the cement by Ground Granulated Blast Furnace Slag (GGBFS) is also a common method to reduce cement consumption. When the briquettes are subjected to high temperature and reducing atmosphere in the BF, the cement phases decompose and the iron oxides undergo a series of phase transformations. To avoid early disintegration and to improve the performance of the briquettes, it is necessary to study these reactions during the reduction. In the present study the reduction behavior of the BF briquette samples was studied by experimental methods in a laboratory scale furnace, which simulates the conditions of the BF shaft in a CO-CO2-N2 atmosphere. With interrupted experiments the composition of the briquette was studied in different reduction stages of the BF shaft. The effect of GGBFS as a binder material on the reduction was studied with GGBFS containing briquette samples. The reduction of briquettes was compared to an olivine pellet which was used as a reference sample. Considerably higher reduction rate was detected with the briquettes compared to the pellet at 1 100°C when reduced to metallic iron. 25-50 vol-% swelling in the briquette samples was detected during the wüstite-iron reduction step at 900-1 000°C. X-ray diffraction (XRD) was used to observe the phase transformations in the Fe-Fe2O3-CaO system of the briquette and the results are in agreement with the theory.

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Section: Reductionmentioning

confidence: 77%

“…(11). This reaction series has been proposed to occur approximately at 750°C by Robinson et al 10) ........ (11) …”

Section: "Wüstite" Experimentsmentioning

confidence: 96%

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Reduction Behavior of Cold-bonded Briquettes under Simulated Blast Furnace Conditions

et al. 2014

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“…The fraction of solid by-products classified as "fine particles" (60 % of dusts and sludge) is very difficult to recycle without extensive pre-treatment and until recently, it has been deposited in landfills. These by-products are problematic to recycle not only because of their small particle size, but also for their high content of impurities, of which the saleable content is not high enough to make further processing economical 1 . In recent years the costs for depositing in landfills have increased due to lack of space and due to increasing environmental restrictions.…”

Section: Introductionmentioning

confidence: 99%

Kinetic Aspects of Methylene Blue Adsorption on Blast Furnace Sludge

Malina

Rađenović

2015

Chem.Biochem.Eng.Q.

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“…2,4,5) Si, Ca, Mg and other minor elemental oxides are present in lesser amounts. Characterization of flue dust from an Egyptian iron and steel company showed that about 74 wt% of the material was below a particle size of 210 mm.…”

Section: Introductionmentioning

confidence: 99%