Desulfurizing Ability of the CaOsatd.-CaCl2-CaF2 Slags

作者：Liu Jiazhan^*; Kobayashi Yoshinao

来源：Metallurgical and Materials Transactions B-Process Metallurgy and Materials Processing Science, 2017, 48(2): 1108-1113.

DOI：10.1007/s11663-016-0890-8

Desulfurizing ability of the CaO-CaCl2-CaF2 slags saturated with CaO has been investigated from the viewpoint of the sulfide capacity and CaO solubility. The CaO-CaCl2-CaF2 slags containing small amounts of Cu2O and CaS were inserted in a CaO crucible with metallic copper. The CaO crucible was sealed in a nickel holder to prevent the evaporation of CaCl2, then heated up and kept at temperatures from 1573 K (1300 A degrees C) to 1673 K (1400 A degrees C) for 24 hours, which enabled the system inside the CaO crucible to reach the equilibrium. As expected, the sulfide capacity derived from the data obtained as well as CaO solubility of the slag increase with an increase in temperature at a constant ratio of CaCl2/CaF2. The solubility of CaO increases by the replacement of CaF2 with CaCl2, whereas the sulfide capacity slightly decreases and the activity coefficient of CaS (gamma (CaS)) increases. This suggests that CaF2 has stronger interaction with CaS than CaCl2. The sulfur distribution ratio between carbon-saturated iron melts and the CaO-CaCl2 slag has been calculated to be about 10 000 at 1573 K (1300 A degrees C) using the sulfide capacity obtained, which value is still large enough even with the replacement of CaF2 by CaCl2.

• 出版日期2017-4