Study on size reduction process of blast furnace slag with grinding aids

The process of size reduction of blast furnace slag(BFS) with different kinds of grinding aids was studied by use of the method of Blaine specific surface area,scanning electron microscope,laser-particle size analysis,and IR test.The result shows that the effects of different kinds of grinding aids are different at different grinding stages of BFS.At the initial grinding stage,the grinding aid NS with poor lubricity shows good performance,while grinding aid A with high lubricity can greatly improve the grinding effect at the fine grinding stage.Without change of grinding time,especially at the fine grinding stage,grinding aids remarkably improve the fineness of grinding and the particle size distribution in ground materials,change the shape of particles and the microstructure of ground materials,intensify the crystal lattice distortion and crystal lattice defect,and accelerate the breakage of chemical bonds of material structures.Therefore,grinding aids improve the activity of ground materials.