Abstract
In order to obtain highly reactive cokes, a Ca-ion exchanged brown coal (Loy–Yang coal) was added to a caking coal (Goonyella coal) with different blending ratios and cokes were then prepared from these blended coal samples. With the addition of Ca-loaded coals, the CO2-gasification reactivity of the resulting cokes was significantly increased. Their initial reactivity was particularly enhanced, at a maximum, being thirty times as high as the reactivity of a coke prepared from a single Goonyella coal. This is because the reactive part derived from the brown coal in each coke was initially gasified with the other part from the caking coal almost intact. Since, as coke texture, the former part (from the brown coal) is included in a matrix of the latter part (from the caking coal), the mechanical strength was not lowered so much, even though the cokes were gasified up to a conversion of 10%. In conclusion, this study demonstrates that some addition of a Ca-ion exchanged brown coal to a caking coal is quite promising for the production of highly reactive and high strength cokes.
