Effect of preformed calcium ferrite addition on sintering behavior of vanadium titanomagnetite

Xie Hao; Li Gang; Lv Xuewei; Sun Xiaodong; He Haixi

doi:10.7513/j.issn.1004-7638.2023.04.018

Volume 44 Issue 4

Aug. 2023

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Xie Hao, Li Gang, Lv Xuewei, Sun Xiaodong, He Haixi. Effect of preformed calcium ferrite addition on sintering behavior of vanadium titanomagnetite[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(4): 117-124. doi: 10.7513/j.issn.1004-7638.2023.04.018

Citation:

Xie Hao, Li Gang, Lv Xuewei, Sun Xiaodong, He Haixi. Effect of preformed calcium ferrite addition on sintering behavior of vanadium titanomagnetite[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(4): 117-124. doi: 10.7513/j.issn.1004-7638.2023.04.018

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Effect of preformed calcium ferrite addition on sintering behavior of vanadium titanomagnetite

doi: 10.7513/j.issn.1004-7638.2023.04.018

Xie Hao^{1, 2
,},
Li Gang¹,
Lv Xuewei²,
Sun Xiaodong¹,
He Haixi¹

1.
CISDI-INFO Co., Ltd., Chongqing 400041, China
2.
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China

Received Date: 2022-12-23
Publish Date: 2023-08-30

Abstract

Abstract

In view of the problems of low yield, poor strength and high energy consumption in the sintering process of vanadium titanomagnetite, a new sintering technology of preformed calcium ferrite is proposed in this paper, and its feasibility and theoretical basis are revealed through the tablet sintering and thermal analysis test. The results show that with the increase of substitution ratio (preformed calcium ferrite to partially substitute CaO), the microstructure of roasted products changes from granular structure to melting corrosion structure, the content of SFCA increases, while perovskite content decreases. In addition, the quantity of melts increases, the coalesce of sintering bubbles is promoted, the average porosity decreases from 42.9% to 36.2%, and the densification of the matrix is promoted. The formation of calcium ferrite melts in the heating process can be divided into three reactions, according to the formation temperature from low to high, it is the eutectic reaction of CF+CF₂ → L, the melting of SFCA-I and SFCA, respectively; the addition of preformed calcium ferrite can reduce the generation temperature of initial melts, and increase the total sintering melts by about 9 %; promote the melting of iron oxides into the initial melts, increase the content of calcium ferrite, and promote solid-liquid assimilation reaction.
- sintering,
- vanadium titanomagnetite,
- preformed calcium ferrite,
- TG-DSC

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References(21)

References

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