MODIFICATION OF COKE PROPERTIES AS A CONSEQUENCE OF COAL PREHEATING

The influence of coal preheating on the properties of the resultant co kes has been studied using a wide range of coking coals which were car bonized, wet and after preheating, at the INCAR Coking Test Plant oper ating on a semi-industrial scale. Coke mechanical strength improved by using the preheating process rather than wet charging, except for som e cokes produced from coals with a content of volatile matter between 19.5 and 25 wt% db. The most significant differences between cokes fro m preheated and wet coals were observed in terms of microporosity. Inc rease in microporosity as a consequence of preheating is accompanied b y an increase in coke reactivity. As regards the optical texture of co kes, a slight increase in the total anisotropy and the size of mosaic features was observed.