Sustainable Mining and Metallurgy

In order to promote the large-scale consumption of electrolytic manganese residue (EMR) in cement and other building materials industry, which is conducive to the harmless, reduction and resource disposal of EMR, the parameters of deamination, desulphurization and iron extraction of EMR were explored, and a series of EMR based active gelling materials were prepared. The results show that the ammonia content and sulfur content of EMR decrease with the increase of roasting temperature. When the temperature is 400℃, the residual ammonia content in the slag is 0.09%, and the deamination rate is greater than 90%. When the roasting is held at 600℃ for 10min, the deamination rate is greater than 98%. When taking higher temperature deamination, better deamination effect can be achieved in a shorter holding time. When held at 1300℃ for different holding time, the sulfur content of electrolytic manganese slag can be reduced to less than 1%, and the desulfurization rate is greater than 96%. The content of Fe in the desulphurized EMR with added auxiliary materials can be reduced to about 1% after holding at 1500℃ for 5min, which can be regarded as an ideal effect of iron extraction. The gelling activity of undisturbed EMR powder is low and it can't reach the standard of S75 slag powder by physical or chemical excitation method. The desulphurized EMR powder can meet the requirements of S75 slag powder after increasing the specific surface area or mixing with activator. The EMR powder after extracting iron has good gelling activity and can be directly used in building materials such as cement mixture after grinding, and the incorporation amount is as high as 50%，which is conducive to bulk consumption of EMR.