1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China 2. Sinosteel Corporation Wuhan Safety Environmental Protection Research Institute, Wuhan 430081, Hubei, China 3. Engineering Research Institute， University of Science and Technology Beijing, Beijing 100083, China
Abstract：To improve the level of resource utilization of KR desulfuration slag, X- ray finorence,X- ray diffraction,SEM and EDS were used to study mineralogy characteristics of KR desulfuration slag of a certain steel mills, and FactSage was used to study the existing state and precipitation law of sulfur in experimental slag. Results show that if using CaO desulfurizer, main phases the corresponding KR desulfuration slag were calcium aluminum silicate,calcium silicon and spinel. The micro appearance of calcium aluminum silicate was continuously outspread with irregular shape, and the surface was smooth and flat without pores and cracks; the shape of calcium silicon was irregular, and surface of it was rough with pores and cracks; the size of spinel was various, and the main shape was irregular polygon, while a small number was in irregular shape. When temperature was over 1220℃，sulfur in experimental slag precipited in form of SO2, CaS existed out at 1220℃，CaSO4 out at 1160℃;at about 1120℃，the precipitating amounts of CaS and CaSO4 remain unchanged with the decrease of temperature, and the amount of CaSO4 in the experimental slag larger than that of CaS.
2015, Vol. 25 
