With the geographical advantage of being adjacent to China and underutilized resource potential,Mongolian iron ore has become a significant source of iron ore supply for China,however,it cannot be directly used in traditional blast furnace smelting due to its high sulfur content. To explore the application feasibility of this high-sulfur iron ore,this paper studies the oxidative roasting test at different temperatures conducted on magnetically separated high-sulfur iron ore concentrate powder. Through the test,the phase composition and sulfur occurrence state of the high-sulfur iron concentrate powder before and after roasting were analyzed. Combined with thermodynamic analysis of relevant reactions within the test temperature range and the change in SO₂ emission mass concentration during roasting,the desulfurization effect and the pattern of sulfur migration behavior in the high-sulfur iron concentrate powder after roasting at different temperatures were obtained. The test results show that the main sulfur-bearing phases in the high-sulfur iron concentrate powder are pyrite and pyrrhotite,and the oxidative desulfurization reactions of both can proceed spontaneously within the test temperature range. After roasting at 1 100 ℃ and 1 200 ℃,the sulfur content of the ore powder decreased from 3. 186% in the raw ore to 0.034% and 0.017%,respectively,with desulfurization rates both exceeding 98%. By revealing the sulfur migration behavior in high-sulfur iron concentrate powder during oxidative roasting,this paper confirms that the high-sulfur iron ore can be efficiently desulfurized through high-temperature oxidative roasting,which provides an important theoretical basis for the application of desulfurization methods in subsequent practical production processes such as pelletizing and sintering etc.