Effect of magnesia on desulfurizing power of blast-furnace slags

Loginov, V. I.; Berin, A. L.; Yaroshenko, N. M.; Lebed, P. K.

doi:10.1007/bf01087881

Cited by 3 publications

(2 citation statements)

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“…In recent past, it is discovered that small amount of nut coke addition in mixture with ferrous burden contributes to better gas permeability, enhanced reduction kinetics, lower Thermal Reserve Zone (TRZ) temperature and good softening melting properties of the ferrous burden. [1][2][3][4] The factors which are known to restrict the higher usage of nut coke in the blast furnace, are: (1) Regular coke layer thickness (minimum coke layer thickness) as the nut coke are charged as the replacement of regular coke, the regular coke layer thickness diminishes, and (2) Improper hearth permeability due to the presence of fine unconsumed coke and coal fines in the hearth. Its usage varies from furnace to furnace and region to region in the range of 2-23 wt-%.…”

Section: Introductionmentioning

confidence: 99%

A review on nut coke utilisation in the ironmaking blast furnaces

Gavel

2016

Materials Science and Technology

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In the ironmaking blast furnaces, nut coke (10-40 mm; 2-23 wt-%) is charged together with the ferrous burden. A systematic review is performed to understand the effects of nut coke use on the permeability, thermal reserve zone (TRZ), reduction kinetics and softening & melting behaviour. State of the art techniques for enhancing reactivity and to lower TRZ temperature are discussed. To utilise nut coke effectively, need of correlational research is expressed on its behaviour with different burden chemistry, carbon ordering, ash content and distribution style. Challenges for higher nut coke utilisation like decrease in regular coke layer thickness and unconsumed fines in lower part of the furnace are pointed out. The scope of further research is marked via this review.

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Section: Introductionmentioning

confidence: 99%

A review on nut coke utilisation in the ironmaking blast furnaces

Gavel

2016

Materials Science and Technology

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“…In order to reduce coke losses Loginov et al suggested mixing of nut coke in the sinter layers. 2 Today the majority of blast furnaces use nut coke (10-100 kg/t hot metal) to reduce production costs. 3 Yaroshevskii et al reported the statistical analysis of the average annual indices of some European blast furnaces which showed that the introduction of 5-30% nut coke of total coke consumption gave the coefficient replacement factor close to 1.…”

Section: Introductionmentioning

confidence: 99%

Influence of nut coke on iron ore sinter reducibility under simulated blast furnace conditions

Mousa

Senk

Babich

et al. 2010

Ironmaking & Steelmaking

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One of the most important factors to increase the economic efficiency of the blast furnace process is to reduced coke losses (undersieve product known as nut coke). In recent years there has been increased interest in mixing nut coke in the sinter layers. In order to clarify the influence of nut coke on sinter reducibility, sinter and sinter-nut coke mixtures were isothermally reduced with 30%CO-70%N 2 at 1173-1523 K using a muffle furnace supported by an on-line gas analyser. Reflected light microscopy, scanning electron microscopy and X-ray technique were used to characterise the microstructure and the different phases developed in the original and reduced sinter. Sinter reduced without nut coke participation exhibited reduction retardation at elevated temperatures (.1373 K) while the presence of nut coke prevented such phenomena. The rate controlling mechanism of sinter and sinter-nut coke mixture was predicted from the correlation between apparent activation energy calculations, mathematical modelling derived from gas-solid reaction model and microstructure examination.

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