Difference in Radial Direction of Lumpy Coke Sampling from Raceway of Large Blast Furnaces: Microstructure, Alkali Enrichment, and Solution Loss Reaction

Author:

She Yuan123,Li Siqi1,Zou Chong1ORCID,Gao Yaqi1,Wu Keng2,Wu Hao1ORCID

Affiliation:

1. School of Metallurgical Engineering Xi'an University of Architecture and Technology Xi'an 710311 Shaanxi China

2. State Key Laboratory of New Technology of Iron and Steel Metallurgy University of Science and Technology Beijing Beijing 100083 China

3. Xining Special Steel Co. Ltd Xining 810005 China

Abstract

In this article, the morphology, chemical structure, alkali enrichment, and solution loss reactivity in the radial direction of the lumpy feed coke and its corresponding raceway coke from two large blast furnaces are comparatively using multiple characterization methods. The results indicate that the erosion of coke and pore development not only occurs on the surface but also in the center, which can be described as gradient reaction model. The enrichment level of K is higher than Na. K content decreases gradually from the edge to the center of the raceway coke, and the formation of nepheline causes cracks in coke observed by morphology. The crystallite order of the raceway coke is higher than that of the feed coke, with the enrichment of alkali metals, the raceway coke shows variability in the radial direction, and the orderliness gradually decreases from the surface to the interior. With the enrichment of alkali metals, the microcrystalline ordering of the raceway coke decreases from the surface to the interior, and the increase in the concentration of carbon dioxide after the entry into the raceway leads to the preferential reaction of the carbon dioxide with the coke matrix which contains K and many reactive sites.

Publisher

Wiley

Subject

Materials Chemistry,Metals and Alloys,Physical and Theoretical Chemistry,Condensed Matter Physics

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