熔剂颗粒在烧结过程中的特征演变及影响

doi:10.13228/j.boyuan.issn0449-749x.20210217

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Abstract In order to study the characteristic evolution of flux particles and corresponding influence on the properties of sinter, the sampling analysis of the whole actual sintering process was carried out. The results indicated that the flux particles less than 0.5 mm were easier to adhere to the surface of core particles than iron ore particles in the mixing process, and these particles distribute uniformly within each grade of the mixture, While the flux particles larger than 0.5 mm, served as the core particles, were adhered with a certain thickness of the adhesive layer that forming new particles, and moreover the thickness of the attachment layer was less than 1 mm, there for, the diameter of the new particles only increases by no more than 2 mm on the basis of the original particles. At the same time, the original flux particles were fine, led to less flux content in the mixture larger than 5 mm after granulation. In the sintering feeding process, there was segregation of particle size, large particles were segregated downward, and the particles larger than 5 mm at the bottom layer were distributed most, resulting in segregation of flux. The increase of particles larger than 5 mm in the mixture increases the flux segregation, while the increase of 3-5 mm particles reduces the flux segregation. Therefore, segregation of particle size reduces the total flux at the bottom layer, increases the larger particle flux. The decrease of the amount of flux particles reduces the distribution point of the flux, and thus increases the uneven distribution of the flux and deteriorates the local high alkalinity environment, then increases the difficulty for liquid phase generation. At the same time, due to the segregation of particles, the large particle iron ore powder in the bottom mixture increases and more unmelted raw ore appears, which eventually leads to the poor quality of the bottom sinter.

Key words： iron ore sintering flux segregation distribution phase composition microstructure

Received: 22 April 2021

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	Articles by authors
	SHI Xian-ju
	WANG Qiang
	LI Guang-qiang
	LIU Dai-fei
	LI Jun

Cite this article:

SHI Xian-ju,WANG Qiang,LI Guang-qiang等. Characteristic evolution and corresponding influence of flux particles in sintering process[J]. Iron and Steel, 2021, 56(12): 28-35.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20210217 OR http://www.chinamet.cn/Jweb_gt/EN/Y2021/V56/I12/28

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