Abstract:Process mineralogy of high arsenic bearing complex gold concentrate was investigated. The effects of roasting temperature and time, and compressed air flow on removal rates of arsenic and sulfur were studied. The results show that this complex gold ore concentrate contains fewer sulfides with main minerals of pyrite, arsenopyrite and gangue minerals such as feldspar and quartz. Gold in concentrate exists mainly as of element or gold and sulfur (arsenic) compound, oxide inclusions and gangue. Particle size of gold particles is mostly between 1~3 μm, part of particles is <1 μm, a few larger grain size can be up to 4~5 μm. Arsenic and sulfur removal rate is up to 97% and 98% above, respectively under the optimum conditions including roasting temperature of 650 ℃, roasting time of 45 min, and compressed air flow of 150 L/h.