This study describes the research results of petroleum coke (carbon) and phosphogypsum reaction and the methods used for the above. Stoichiometric petroleum coke and phosphogypsum mixtures were prepared for the study. The coke was cut and screened with particle size distribution of 0.25-0.315 mm and dried at 110 °С temperature. The phosphogypsum sample was also cut and screened with the same particle size and was pre-heated within the 100-200 °С range up to permanent mass. The weighed samples were heated within 900 till 1000 °С, the range being typical to one of reaction stages between coke and phosphogypsum, i.e. the decomposition reaction with the products of calcium sulfide and carbon dioxide. The extend and rate of samples conversion and their time correlations were obtained for the number of reaction temperatures. Reaction rate constant and activating energy were calculated based on this correlations results.

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