Hot Strength of Coke Prepared by Briquetting and Carbonization of Lignite

Abstract

The hot strength of coke prepared from an acid-washed lignite by briquetting-carbonization before and after CO₂ gasification was, for the first time, investigated in this work. The hot strength at 1000°C before gasification was higher than coke strength measured at a room temperature. CO₂ gasification resulted in a linear decrease of the hot strength with the reaction time. The lignite-coke showed faster decrease in the strength during gasification, compared to conventional cokes derived from caking coal or non-or slightly caking coal, due to the high reactivity caused by its porous structure and catalytic metal species remaining even after the acid-washing, while it showed superior hot strength at the initial stage of gasification.