In order to find a reasonable disposal method for electrolytic manganese slag (EMS), effect of roasting at medium and high temperature on the content of manganese, sulfur and ammoniacal nitrogen in EMS was explored. The results show that after the EMS is directly roasted at 1 050 ℃ for 60 min, the mass fraction of S in the EMS sample falls from 9.11% to 0.87%, while the mass fraction of Mn goes up from 1.87% to 2.26%. After being washed with water, the EMS sample is then roasted with 3% coal (in mass fraction) at 1 000 ℃ for 60 min. As a result, the mass fractions of S and Mn in the obtained roasted sample drop down to 1.32% and 0.78%, respectively. It is found that after direct roasting process at medium and high temperature, EMS can meet the requirement of mass fraction of S for cement admixture, and also medium and high temperature roasting process can almost remove all ammoniacal nitrogen therein, presenting a good removal effect.

electrolytic manganese slag (EMS)  /  roasting at medium and high temperature  /  desulfurization  /  cement  /  dehydrogenation  /  ammonia removal