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The study of the weathering of two bituminous coals stored at the INCAR stockyard and its influence on coke quality is presented. These coals of similar rank are present in industrial blends used by the Corporacion Siderurgica Integral (CSI) for the production of blast-furnace coke. Of all the techniques used to determine the degree of weathering, via thermoplastic properties, Gieseler plastometry was found to be the most sensitive. Coking tests were carried out in the semi-industrial coking plant at INCAR. The effect of weathering on each coal series is completely different. Weathering produces a loss of maximum fluidity accompanied by a decrease in aliphatic hydrogen in both coals. However, the loss rate is different in each case. Coke quality clearly decreases in one, while in the other improves at first but then gradually deteriorates. An improvement in coke quality due to weathering not only affects some high-volatile coals as it is well known but also medium volatile coals.

Influencia de la alteración meteórica de dos carbones coquizables con contenido medio de materia volátil en la calidad del coque producido