Based on the analysis of the physical and chemical properties of the experimental raw material,a gold-bearing high-grade sulfur concentrate,the industrial experiment of its fluidized roasting was carried out with 100 kt/a roasting acid preparation device.At the same time,the thermodynamic and equilibrium composition of roasting reaction were simulated by HSC6.0 software.The effects of roasting intensity on the yield of mixed residue,roasting quality,element distribution characteristics and the proportion of recovered reduce at different residue discharge ports were investigated.Besides,the roasting reaction mechanism was studied.The results show that the sulfur concentrate has fine particle size,the fineness of-0.074 mm accounts for 95.58 %,and there is no overflow residue in the process of fluid-ized roasting.The roasting intensity has little effect in the yield of mixed residue.The proportion of boiler residue and cyclone dust increases first and then decreases with the increase of roasting intensity,and the proportion of electric dust decreases first and then increases with the increase of roasting intensity.The contents of Au and   Fe   in boiler residue are the higher,and the contents of other impurity elements are lower.The impurity element grade in mixed reside can be lowered by increasing the proportion of boiler residue.Under proper roasting intensity(5.9 t/(m²·d)),the sulfur removal rate of the gold-bearing high-grade sulfur concentrate and the Fe grade of mixed residue are 98.71 % and 64.78 % respectively.The proportion of boiler residue and electric dust in mixed residue are 57.92 % and 3.96 % respectively.Fe₂O₃ in the sulfuric acid residue may decompose into Fe₃O₄ when the temperature rises to 650 ℃.