Abstract: The reaction characteristic of tin removal from tin-bearing iron concentrate by sulfidation roasting was studied. The sulfidation roasting process includes two parts: reduction and sulphuration volatilization. The reaction system should be controlled at weak reductive atmosphere for promoting tin volatilization. The TG-DSC analysis results of pyrite show that a liquid phase is generated in the bulk with increasing of temperature to 1150℃, and the roasting temperature should be kept at around 1150℃ to promote the sulphuration volatilization of tin. XRD analysis results show that the original iron phases of Fe3O4 and Fe2O3 are transformed into FeO and metallic iron after the sulfidation roasting of pyrite, tin-bearing iron concentrate and coal. When the temperature is increased, FeO and metallic iron contents are increased significantly, and the process realizes the iron prereduction of concentrate. The kinetic analysis results show that the apparent activation energy of tin removal reaction is 13.96 kJ/mol, and the reaction limiting step the mass transfer of reactants.

Key words: tin-bearing iron concentrate, sulfidation roasting, TG-DSC analysis, kinetics

摘要： 对含锡铁精矿的硫化焙烧脱锡反应特征进行了研究. 结果表明，焙烧过程包括还原和硫化挥发两部分，为促进其中锡的挥发，系统应控制为弱还原性气氛. 1150℃时物料中开始有液相产生，硫化焙烧后，物料中铁物相由Fe3O4和Fe2O3转变为FeO和金属铁，且随硫化焙烧温度升高含量增多，实现了含锡铁精矿中铁的预还原. 动力学分析表明，反应的表观活化能E=13.96 kJ/mol，反应受扩散控制.

关键词: 含锡铁精矿, 硫化焙烧, TG-DSC分析, 动力学