MANUFACTURE OF COKE FOR GRAPHITE MOLDING

摘要

PURPOSE:To manufacture the titled coke causing hardly irreversible expansion in a graphitizing stage and giving a graphite molding with superior thermal shock resistance by calcining raw coke and heat treating the calcined coke in a steam atmosphere. CONSTITUTION:A carbonaceous starting material such as coal tar or soft coal tar pitch is coked with a delayed coker to form raw coke contd. about 5-8% volatile matter. It is preferable that quinoline-insoluble matter is removed beforehand from the staring material. The raw coke is put in a rotary kiln or the like and calcined at about 1,000-1,600 deg.C. The calcined coke is heat treated at >=700 deg.C for about 1-10hr in a steam atmosphere having >= about 15vol% concn. of steam to obtain coke for a graphite molding.