THERMAL-BEHAVIOR AND REACTIVITY OF GREEN PETROLEUM COKES USED AS ADDITIVES IN METALLURGICAL COKEMAKING

One calcined and five green petroleum cokes were subjected, in a therm obalance, to controlled thermal treatment up to 1000 degrees C in an N -2 atmosphere and then reacted with CO2 at this temperature. Based on the DTG curves, the volatile matter released during the pyrolysis stag e was divided into five intervals (<150, 150-400, 400-500, 500-750 and 750-1000 degrees C). Relevant information can be obtained from the am ount of volatile matter released in these intervals. In particular, it was found that the amount of volatile matter released in the 400-500 degrees C interval can be related to the modifications observed in the fluidity of coal/PC blends which in turn affects the properties of me tallurgical cokes obtained from these blends. Petroleum coke reactivit y parameters were also obtained. A good correlation was found between the reactivity at 20% of conversion (R-20) and the optical texture ind ex (OTT) calculated from the quantitative analysis of anisotropic comp onents in the cokes. In contrast with the relevance of the information obtained from the volatile matter released during the thermal treatme nt of the petroleum cokes, the reactivity of petroleum cokes was found to have little influence on the reactivity of metallurgical cokes pre pared from coal/PC blends. (C) 1998 Elsevier Science B.V. All rights r eserved.