Thermal Reduction of Mechanically Activated Cinnabar (HgS) and Stibnite (Sb2S3)

The reduction of cinnabar (HgS) and stibnite (Sb₂S₃) by hydrogen was investigated. These investigations were performed in the temperature region 636–765 K for cinnabar and in the region 825–954 K for stibnite. It has appeared that the mechanical activation positively affects the thermal reduction of the sulphides. The thermal decomposition of HgS is accompanied by a change in mechanism taking place at 744 K. As to Sb₂S₃, the change in mechanism inthe investigated temperature region was not observed.This revised version was published online in November 2005 with corrections to the Cover Date.