COCARBONIZATION OF PITCHES WITH COAL MIXTURES FOR THE PRODUCTION OF METALLURGICAL COKES

This study is concerned with the co-carbonization of coal-tar pitch wi th weak-coking coal mixtures for the production of high-strength metal lurgical cokes for the blast furnace process. Several lab-scale testin g methods have been applied to the pitch/coal blends including coking tests, dilatometry, Gieseler plastometry, and measuring strength and a nisotropy of the obtained cokes and semi-cokes. These lab-scale tests and full-scale coke oven tests showed that the addition of, for exampl e, 5-7% coal-tar pitch and 5% coke breeze to Polish coal blends improv e their coking properties. Similar improvements can be achieved by the addition of reactive pitches from liquid-phase co-thermolysis of scra p plastics with coal-tar pitch.