In order to reuse some discarded pyrite slag,the experimental study of making iron concentrate from the pyrite slag was carried out,in which the iron was recovered by magnetic separation and the sulfur was removed from the iron concentrate by floatation.The feasibility of removing sulfur from the pyrite slag was discussed in detail.The pyrite slag used in the test contains iron of 50.12% and sulfur of 1.48%.After magnetic separation of the pyrite slag,an iron concentration with an iron content of 65.44% and a sulfur content of 0.96% was obtained.The experimental results of the floatation desulphurization show that good desulphurization effect can been achieved when the pH values of the slurries are 5.5 and 9.5 respectively for the first floatation and the second floatation,the slurry density is 20%~30% and the content of grain below 0.074mm is about 80% for grinding fineness,and the floatation temperature of has little effect on desulphurization effect so the temperature of the slurry can is at normal temperature.The conclusion is that an iron concentrate containing iron of 65.35% and sulfur of 0.39% can be got by magnetic separation and then desulphurization.