Abstract
To clarify the effect of pressure load on the behavior of coal, product gases and the properties of the coal during carbonization were examined. By increasing the pressure load (〜40MPa) during the carbonization, H_2 and CO formations were significantly suppressed; the amount of pyridine extractable from the solid residue (coke) significantly increased at the carbonization temperature of 350 to 400℃; and the yield of coke increased. These effects were found to be brought about through the suppression of cross-linking reactions during the initial stage of carbonization under the pressure load. This fording partly clarified the mechanism by which the metallurgical coke having good properties could be produced from weakly coking coals by the hot-briquetting method.
