2007 Volume 93 Issue 1 Pages 9-17
The development of production and utilization technology of highly reactive coke is significant in order to improve blast furnace reaction efficiency. In this report, the post-reaction strength of catalyst-doped highly reactive coke was investigated. The reaction between coke and CO2 was stopped at the weight loss of 20% and the reaction temperature was adjusted so that the reaction lasted for a constant period. In this experimental condition, the reaction temperature of highly reactive coke was lower than that of normal coke, which corresponds to the decrease in the thermal rezerve zone temperature in blast furnace. First, a decrease in reaction temperature made the reaction of the catalyst doped nut coke more homogeneous, which increased the post-reaction strength of the highly reactive coke produced by post-addition of catalyst to coke method, however, decreased that of the highly reactive coke produced by pre-addition of catalyst to coke method. Secondly, the post-reaction strength of catalyst-doped highly reactive coke produced by post-addition of catalyst to coke method became equal to or greater than that of normal coke. The kinds of catalysts and the catalyst adding method affects the porosity distribution of coke after reaction and hence the post-reaction strength of coke to a great extent. Suitable selection of catalysts and its addition method to coke leads to the highly reactive coke with post-reaction strength greater than that of normal coke. Catalyst-doped highly reactive coke seems to be promising to improve blast furnace reaction efficiency.