（1. Ironmaking Department， Shougang Jingtang United Iron and Steel Co.， Ltd.， Tangshan 063210， Hebei， China 2. School of Metallurgical and Ecological Engineering， University of Science and Technology Beijing， Beijing 100083， China）
Abstract：Through simulating the actual situation where coke was simultaneously affected by K and Na vapours in blast furnace, the evolution of coke structure and thermal properties（CRI，CSR）after alkalization with different proportions of K and Na vapours were revealed. Results showed that the coke structure was broken when the proportion of alkali vapours reached 3%，and the coke fine formation rate increased with the increase of K vapour，which indicated that K vapour caused a great damage to coke structure. The CRI of coke reached the highest and the CSR reached the lowest when mass ratio of K/Na was 3/7. It was observed with SEM and energy dispersive spectrometer that K and Na existed in both mineral matters and carbon matrix; nepheline, generated when coke reacted with alkaline (K，Na) vapours, was determined by XRD. The content of K and Na in nepheline is dependent on the ratio of alkaline (K，Na).
2017, Vol. 27 
