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Literature analysis shows that the physical significance of the equation from which the index B b is calculated does not support its description as the ash basicity index. For quantitative assessment of the coal's mineral component, which has an important influence on the coke quality-specifically, on CSR and CRIthe potential reactivity of coke (CRP) is recommended as a better characterization of the index B b . Three and two parameter versions of the formula for CRP are presented. Models of the relation CRP = f(I b ) are developed for different parameter ranges. It is found that CRP and I b are not analogs. Therefore, in the devel opment of resources for the production of high quality coke (in terms of CRP and CRI), these parameters should both be used.

In a recent issue of this journal, Malyi described experiments on the modification of DG coal for its subsequent use in coking batch in place of G coal. Analysis of that paper shows that, contrary to Malyi's statements, there is no shortage of G coal, because the Donets Basin comfortably meets the demand. The model mixture that Malyi uses for modification is complex in composition and contains considerable sulfur. He does not state its properties or the available reserves. Malyi's ideas regarding the pyrolysis of coal are shown to be very contradictory, while his experimental data prompt skepticism, since the measured ash con tent, total sulfur content, and clinkering properties of the batch differ from those calculated on the basis of the properties and proportions of the batch components. When using batch that contains modified DG coal in place of G coal, the coke yield is reduced, and its quality is impaired. These findings support the conclusion that Malyi's research is unnecessary, unpromising, and unworthy of further consideration.

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