Reaction mechanism study of new scheme using elemental sulfur for conversion of barite to barium sulfide

Barium sulfide has been widely accepted as a useful barium compound in many fields. To reduce the emission of CO 2 through tail gas during the current industrial production of barium sulfide by the black ash method, a new clean process for barium sulfide preparation by barite reduction using elemental sulfur is proposed. Herein, we report a study on the kinetics and thermodynamics of the thermal decomposition of barium sulfate by elemental sulfur . The mechanism of this complicated gas–solid reaction was investigated under non-isothermal conditions, at different heating rates. Four isoconversional methods were used to determine the activation energy . The mechanism model of the barium sulfate decomposition was confirmed using the double equal–double step method. The results suggested that the barium sulfate decomposition followed the Jander D3 spherical symmetry model; the order of the reaction ( n  = 1.06) was determined using the Carne equation.