Effects of Recycling By-Products as Calcium Ferrites Added to the Sinter Mix on Sinter Quality and Emission of CO2, NO, and SO2

Rocha, Leonardo Tomas da; Cho, Seongkyu; Kim, Sung‐Wan; Jung, Seung Boo

doi:10.1007/s11663-022-02618-y

Cited by 4 publications

(1 citation statement)

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“…Specially, high-basicity sinter is well received due to the low sintering temperature, high product strength, and good reducibility in blast furnaces [5][6][7][8]. As metallurgical production progresses, iron ore fines with high quality are becoming scarcer, causing an increase in gangue content like Al 2 O 3 and SiO 2 in raw materials for the sintering process [9][10][11][12][13][14][15][16]. So, attention is being paid to the effect of gangue on the formation mechanism of complex calcium ferrite (SFCA) as a bonding phase of high-basicity sinter.…”

Section: Introductionmentioning

confidence: 99%

Formation of Calcium Ferrite Containing Aluminum (CFA) in Sintering of Iron Ore Fines

Du,

Guo,

Guo

2024

Minerals

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Calcium ferrite containing aluminum (CFA) is a precursor of the low-temperature bonding phase in the sintering process of iron ore fines for blast furnace ironmaking. Thus, improving the formation of CFA at lower temperature is very important for saving energy, improving efficiency and production. In this paper, the formation process of CFA was investigated at 1200 °C by reactions of alumina (Al2O3), respectively with a mixture of calcium oxide (CaO) and hematite (Fe2O3) and monocalcium ferrite (CF) as a recognized initial product, as well as reaction of Al-containing hematite (Hss) with CF. The result confirmed that CF is an intermediate product formed easily in the sintering process, and it may react with excessive Fe2O3 to generate an alpha-calcium iron oxide (Ca2Fe15.50O25) as a new phase. It was found that CFA can be formed directly by reactions of CF with Hss and Ca2Fe15.50O25 with Al2O3, while the reaction of CF with Al2O3 is more helpful in generating Ca2Fe15.5O25 rather than CFA, simultaneously forming a calcium aluminum oxide (CaAl2O4, CA; CaAl4O7, CA2). It was revealed that the appearance of CA and CA2 is a main reason to hinder CFA formation in the sintering process of iron ore fines.

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