The silicomanganese slag of extracting silicomanganese alloy is divided into dry slag, mostly massive, and water slag, mostly fine granular. Its structure is loose, the appearance is often light green particles, and it is composed of some irregular porous amorphous particles. It is mainly composed of CaSiO3, caal2o4, ca2al2sio7, ca2mgsi2o7 and MgSiO3.