Role of MgO and Its Different Minerals on Properties of Iron Ore Pellet

Meraj, Md.; Pramanik, Susanta; Pal, Jagannath

doi:10.1007/s12666-015-0676-8

Cited by 26 publications

(11 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Meraj et al found that different MgO flux carriers had different effects on the properties of pellets [ 26 ]. He found that pellets with a MgO content of 0.9% could reduce the reduction degradation index to 7.5%, but a little deterioration in the cold compression strength property also occurred.…”

Section: Introductionmentioning

confidence: 99%

“…Adding olivine and magnesite fluxes helped the pellet maintain good cold compression strength properties at a lower induration temperature, and it did not reduce the degradation index to a sufficiently low level. Compared with adding magnesite, olivine better improved the pellet performance because of the different gangue contents [ 26 ]. Fan et al revealed that lime and lightly burnt dolomite made the drop strength of the green pellet decrease firstly, and then it increased with the addition of further additives.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Finely Ground Limestone and Dolomite on Compression Strength and Reduction Swelling of Vanadium-Titanium Pellets

et al. 2021

View full text Add to dashboard Cite

Vanadium−titanium magnetite (VTM) is an important raw material for ironmaking under the situation of increasingly demanding scarce resources. To further improve the metallurgical properties of pellets, and to satisfy the requirements of blast furnace slag basicity, finely ground dolomite and limestone have been added to the pellet. In this study, the effect of finely ground dolomite and limestone on the metallurgical properties (green pellet drop strength, cold compression strength, reduction swelling index, and microscopic mineral structure) of VTM pellets were investigated. With the addition of finely ground dolomite and limestone, the drop strength of the green pellet was improved. The effect of adding finely ground limestone was greater than adding finely ground dolomite. Adding more finely ground dolomite and limestone compared to pellets without limestone and dolomite, the cold compression strength was decreased, which was attributed to the decomposition of limestone and dolomite during the induration of pellets. With the addition of dolomite, the reduction swelling index (RSI) increased firstly and then decreased. When the basicity of the pellet was 0.54 to 0.94, the slag phase with the lowest melting point was formed, corresponding to the maximum of the reduction swelling index. For the pellets with added limestone, the reduction swelling of the pellets deteriorated. The reduction index of the pellets increased and reached the maximum (26.6%) at a basicity of 1.54, which belongs to abnormal swelling.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Finely Ground Limestone and Dolomite on Compression Strength and Reduction Swelling of Vanadium-Titanium Pellets

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The previous studies reported the influence of pellet MgO content on the qualities and the microstructures of hematite pellets [12][13][14][15][16][17]. The results presented that by increasing the content of MgO, RDI and RSI of pellets were improved.…”

Section: Introductionmentioning

confidence: 99%

Preparation of MgO added iron ore pellets and effects on a pilot scale blast furnace operation

Chun

Meng

et al. 2019

J min metall B Metall

View full text Add to dashboard Cite

The preparation of MgO bearing iron ore pellets in the mini and pilot scales, and the application for 4070m3 blast furnace were conducted in this paper. The results show that with increasing the MgO content, the compressive strength of fired pellets decreased significantly, while the metallurgical performances, such as RI (reducibility index), RDI (reduction degradation index) and RSI (reduction swelling index) were improved. The scanning electron microscope with energy dispersive spectrometry was used to test the microstructures and the compositions of iron oxide, and the slag of pellets. With increasing the MgO content, MgO exists in the form of magnesium ferrite and monticellite, which presents the high melting temperature, decreasing the content of liquid phase. The pilot scale experiment was performed on a commercial running grate-rotary kiln with the annual output of 2.4 million tons of pellets, which agrees with the results obtained in the mini scale experiment. The application of MgO-bearing pellets was carried out in the 4070 m 3 blast furnace of Meisteel China, and the production indexes improved with increasing the yield and reducing the coke ratio, and the total benefits are 7067 USD/d, which presents the superior economic benefits.

show abstract

“…However, the effect of MgO on pellet properties is varied with the category and composition of both iron ores and MgO additives. For hematite pellets, the researchers illustrated that the MgO additives like magnesite, olivine, and pyroxenite were able to effectively decrease the reduction swelling index (RSI), but they have different effects on compressive strength (CS) and reducibility. In terms of magnetite pellets, Li et al presented that the RSI increased first, and then kept constant with the increase of pure MgO reagent content in pellets.…”

Section: Introductionmentioning

confidence: 99%

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

Gao

Cheng

Xue

et al. 2018

steel research int.

View full text Add to dashboard Cite

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.

show abstract

Role of MgO and Its Different Minerals on Properties of Iron Ore Pellet

Cited by 26 publications

References 16 publications

Effect of Finely Ground Limestone and Dolomite on Compression Strength and Reduction Swelling of Vanadium-Titanium Pellets

Effect of Finely Ground Limestone and Dolomite on Compression Strength and Reduction Swelling of Vanadium-Titanium Pellets

Preparation of MgO added iron ore pellets and effects on a pilot scale blast furnace operation

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

Contact Info

Product

Resources

About