Distribution of harmful elements in dissected 125 m3 blast furnace. (2nd October 2019)

• Record Type: Journal Article
• Authors: Fan, Xiaoyue; Zhang, Jianliang; Jiao, Kexin; Zhang, Jiaquan; Wang, Kaidi
• Is Part Of: Canadian metallurgical quarterly. Volume 58:Number 4(2019)
• Page Start: 400
• Page End: 409
• Publication Date: 2019-10-02
• Subjects: Blast furnace -- dissection -- refractory -- harmful elements -- distribution; Metallurgy -- Periodicals; 669.05
• DOI: 10.1080/00084433.2019.1617508
• Languages: English
• ISSNs: 0008-4433

Abstract

ABSTRACT: This paper investigates the distribution of harmful elements in furnace burden and refractory of a water-quenched blast furnace X (BFX) through SEM images, EDS spectra and XRD results. The results show that zinc is mainly concentrated on the lumpy zone while the dominant enrichment region of alkali metal is the cohesive zone. The microstructure and XRD results of refractories in various locations indicate that the erosion caused by harmful elements begins on the hot outer surface of higher stack with the adhesion of zinc, while potassium then completely permeates into the first-layer refractory in the lower part of stack. The local expansion of volume caused by the introduction of harmful elements leads to the erosion of refractory, while the enhanced erosion from the throat to the bottom of the furnace can be explained by the rising temperature. Owing to the shifting location of the temperature isothermal, the harmful elements enrichment region transforms from hot outer surface of refractory at higher part of BFX to the cold inner surface at lower part of BFX.