Regular Article

Coal blend properties and evaluation on the quality of stamp charging coke from weakly coking blends

¹ The Key Laboratory of Chemical Metallurgy Engineering of Liaoning Province, University of Science and Technology Liaoning, Anshan 114051, Liaoning Province, PR China
² Shandong Steel Group Jinan Iron & Steel Co., Ltd., Jinan, PR China
³ College of Chemical Engineering, Hebei United University, Tangshan 063009, Hebei Province, PR China

^* e-mail: wangqi8822@sina.com

Received: 26 February 2017
Accepted: 2 June 2017

Abstract

Stamp charging coking can use weakly coking coal effectively, which can cut the cost for iron and steel enterprises. However, the quality of stamp charging coke has been debated due to lower CSR index. In this paper, the correlation between blend coking properties and quality indices of stamp charging coke is given out through statistical analysis of data from coking production, the effect of blend properties and stamping on the properties of stamp charging coke is estimated through microstructure, and the strength after reaction of stamp charging coke is evaluated through temperature dependence of reacted coke strength and BF smelting. The results show that the stamping permits to use the weakly coking blend with lower G index without impairing the M₁₀ and M₄₀ indices, but the CSR index is decreased. Meanwhile, the reason that the stamp charging coke with lower CSR index can also be used smoothly in BF is presented. The present works are significant to guide the blending of increasing weakly coking coal and evaluate reasonably the quality of stamp charging cokes.