In response to the problem of metallurgical dust containing a high amount of alkali metal chlorides affecting the sintering performance of mixed ore in the sintering process,micro sintering experiments were used in this paper to study the effect of different alkali metal chloride contents on the high-temperature sintering characteristics of iron ore powder. The result showed that the alkali metal chloride reacts with SiO₂ to form a silicate during the sintering process,which inhibited the formation of composite calcium ferrite. It causes the minimum assimilation temperature of iron ore to increase. The amount of liquid phase of the iron ore powder decreased with the increase of the content of alkali metal chloride. This caused to decrease the shrinkage height and the fluidity index of the iron ore. When the alkali metal chloride was too much,the increase of the amount of K⁺ and Na⁺ in the liquid phase reduced the viscosity of the liquid phase so that led to a slight increase in flow index. The number of large pores in sintered ore gradually decreased with the addition of alkali chloride,which increased the sintered ore bond strength.