At various Russian and non-Russian enterprises, cupronickel sulfide concent
rates are roasted for partial removal of sulfur, The oxidation of solid sul
fides is a complex heterogeneous process, associated with adsorption, desor
ption, external and internal diffusion, and various multistage chemical rea
ctions. Therefore, if the process is to be conducted correctly, it is impor
tant to study the kinetic aspects of oxidation and the mechanism by which t
he sulfide materials react with gaseous oxygen.