Degradation of Structure and Properties of Coke in Blast Furnace: Effect of High-Temperature Heat Treatment

• Published in: Characterization of Minerals, Metals, and Materials 2022 pp. 163 - 175
• Main Authors: Chen, Jingbo, Ren, Wei, Guo, Yan, Zhang, Shengfu
• Format: Book Chapter
• Language: English
• Published: Cham Springer International Publishing
• Series: The Minerals, Metals & Materials Series
• Subjects: Coke performance; Compressive strength; Heat treatment; Microstructure
• ISBN: 9783030923723; 303092372X
• ISSN: 2367-1181; 2367-1696
• DOI: 10.1007/978-3-030-92373-0_16

Coke, as one of the main rawRaw materials for blast furnaceFurnace iron-making, is consumed in large quantities in the iron and steel industry. CokePerformanceperformanceCoke performance is deteriorated by thermal stress, carbon loss reaction, molten slag, iron erosion, and alkali metal catalytic erosion. Therefore, the degradation of coke properties is very complicated in blast furnaceFurnace. The deterioration of coke properties is also closely related to structural changes. To clarify the relationship between coke properties and carbon matrix structure during high temperature in the blast furnaceFurnace, metallurgical coke obtained by blending was subjected to heat treatmentHeat treatment under N2 at 1100–1600 ℃ (corresponding from the lumpy zone to the dropping zone). I-type drum, universal material testing machine, X-ray diffractionX-ray diffraction, and optical microscope were used to characterize the change of coke properties and carbon matrix structure. The results showed that the compressive strengthCompressive strength and particle size of coke will regularly decrease after heat treatmentHeat treatment. The degradation of coke structure and properties is low below 1100 ℃ and becomes serious rapidly at 1300–1600 ℃. The main reason for the decrease of coke compressive strengthCompressive strength and pulverization is the increase of graphitization and enlargement of porosity, respectively.