Effect of Blaine Fineness on the Quality of Hematite Iron Ore Pellets for Blast Furnace

Pal, Jagannath; Ghorai, Soumitra; Agarwal, Sanjay; Nandi, Bikash; Chakraborty, Tapas; Das, Goutam; Prakash, Satya

doi:10.1080/08827508.2013.873862

Cited by 47 publications

(24 citation statements)

References 11 publications

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“…12) To reduce this RDI, MgO containing flux is useful as has been mentioned in Sec 1. Therefore, before assessing the performance of hydroxide lime, optimum requirement of MgO content and basicity is necessary.…”

Section: Resultsmentioning

confidence: 99%

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Development on Iron Ore Pelletization Using Calcined Lime and MgO Combined Flux Replacing Limestone and Bentonite

et al. 2014

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CaO and MgO bearing fluxes are widely used in sinters and pellet to improve their basicity and other properties viz. strength and physico-chemical properties especially, for lowering reduction degradation index of high alumina ore agglomerate. Limestone (CaCO3 mineral) is presently used as CaO input in agglomeration. Endothermic calcination of CaCO3 at elevated temperature is energy consuming and kinetic driven process. Grinding to powder also consumes energy. In contrary, calcined lime is relatively softer and disintegrates on hydration. Calcined and hydrated lime both has very good green bonding property also. Though, calcined/hydrated lime is used in sintering replacing limestone, it is hardly used in pelletization. This is because of facing problems viz. crack formation in pellet, loss in bonding efficiency of bentonite, handling of hydrated lime etc. However, suitable adjustment of flux composition and process parameters can make the calcined lime usable in pelletization as advantage. This study is concentrated on optimization of MgO (olivine) flux addition and basicity and finally used calcined lime in place of limestone in developing good quality iron ore pellets with combined flux. It is found that calcined lime fluxed pellet without bentonite and limestone shows very good dry compressive strength (3.5 kg/pellet) and improved green compressive strength (1.5 kg/pellet), drop numbers (12 Nos ), cold crushing strength (310 kg/pellet) and reduction properties. The complete replacement of limestone and bentonite is found with better pellet properties. The bentonite elimination will help minimizing alumina and silica input in pellet and reduce the cost in pelletization.KEY WORDS: iron ore plletization; combined flux; use of calcined lime; elimination of bentonite; replacement of limestone; pellet properties.

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Section: Resultsmentioning

confidence: 99%

“…may be mentioned. Further, high alumina hematite pellets like Noamundi ore pellet shows very high RDI, 12) which requires MgO bearing flux addition. Therefore, it is necessary to optimize the pellet chemistry and maintain suitable operation condition to get the advantage of calcined lime.…”

Section: Introductionmentioning

confidence: 99%

Development on Iron Ore Pelletization Using Calcined Lime and MgO Combined Flux Replacing Limestone and Bentonite

et al. 2014

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“…Therefore, a minor addition of MgO is done to reduce its RDI below the acceptable limit. The beneficial effect of MgO addition has also been reported by other investigators (Thaning 1976;Pal et al 2015). For decreasing the RDI without increasing basicity, MgO in the form of olivine was added in pellets C4-a, C4-b containing 15% mill scale.…”

Section: Physicochemical Properties Of Mill Scale Added Pelletsmentioning

confidence: 92%

“…Thus, further increase in temperature is required for acidic pellets without mill scale to get good strength. Many researchers have found it to be as high as 1325°C (Pal et al 2015). However, in 15% mill scale added acidic pellet, nearly 250 kg/pellet CCS is achieved at 1250°C induration temperature (Figure 3), which is suitable for blast furnace operation.…”

Section: Use Of Mill Scale As Additivementioning

confidence: 99%

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Mill scale as a potential additive to improve the quality of hematite ore pellet

Rajshekar

Pal

Venugopalan

2017

Mineral Processing and Extractive Metallurgy Review

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Hematite pellet is required to be indurated at very high temperature to achieve its good strength as there is no exothermic heat of oxidation unlike magnetite. As mill scale contains mainly FeO and Fe 3 O 4 , any minor amount of its addition in pellet can provide in situ heat and enhance diffusion bonding and sintering. In this study, the mill scale generated in steel plant is added as magnetite input in hematite pellet both in acidic and in basic condition. It has been found that in fluxed pellet, mill scale can improve the properties of pellet. In acidic pellet, the induration temperature has been reduced to a great extent (1250-1275°C) and all properties have been found to be improved due to the addition of 15% mill scale. Mill scale shows enough potential to eliminate the flux addition in producing blast furnace quality pellet from hematite ore. Thus, the flux free acidic pellet has been developed even at very low temperature (1275°C) of induration.

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Property Investigations of Low‐Grade Vanadium‐Titanium Magnetite Pellets with Different MgO Contents

Gao

Cheng

Xue

et al. 2018

steel research int.

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Properties of low-grade vanadium-titanium magnetite pellets (LGVTMP) with different MgO contents are investigated. Since MgO can ameliorate the properties of acid pellets, pure MgO reagent is added to LGVTMP as a MgO additive in this paper. The experimental results show that the compressive strength (CS) of different MgO-bearing LGVTMP has a decreasing trend with the increase of MgO content, but all of the pellets are above 2000 N/pellet and meet the requirement of the blast furnace production when the roasting temperature is 1250 C. And the mechanism of MgO on reduction swelling (RS) is different from hematite and magnetite. At 900 C, the RS of LGVTMP mainly occurs in the reduction process of Fe 2 O 3 ! Fe 3 O 4 ! FeO and Fe 2 TiO 5 ! Fe 2 TiO 4 under the atmosphere of 70% N 2 and 30% CO. Moreover, reduction swelling index (RSI) of LGVTMP increases first and then decreases with the increase of MgO content, and 1.25% MgO pellets have worse RSI of 17.9%. In addition, adding MgO can improve the reducibility of LGVTMP due to the decrease of Fe 2 TiO 5 content.

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Effect of Blaine Fineness on the Quality of Hematite Iron Ore Pellets for Blast Furnace

Cited by 47 publications

References 11 publications

Development on Iron Ore Pelletization Using Calcined Lime and MgO Combined Flux Replacing Limestone and Bentonite

Development on Iron Ore Pelletization Using Calcined Lime and MgO Combined Flux Replacing Limestone and Bentonite

Mill scale as a potential additive to improve the quality of hematite ore pellet

Property Investigations of Low‐Grade Vanadium‐Titanium Magnetite Pellets with Different MgO Contents

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