スラグ中の酸化亜鉛の熱力学的考察 (第3報)
1969 年 85 巻 978 号 p. 875-880
詳細
1969 年 85 巻 978 号 p. 875-880
Each molten slag of FeO-Fe203-Si02-ZnO, FeO-Fe203-Si02-CaO-ZnO, FeO-Fe203-Si02-Na2O-ZnO, FeO-Fe203-Si02-Al2O3-ZnO, and FeO-Fe203-Si02-Al2O3-CaO-ZnO systems was brought into equilibrium with a gas mixture of CO, CO2, and Zn vapor which was prepared through reduction of pure ZnO pellets with a CO-CO2 gas mixture. The temperatures of the slag and the ZnO pellets were about 1, 100°and 1, 200°C, respectively, and the activities of ZnO in the molten slags, calculated from these temperatures, were about 0.3.
An increase in the basicity of each slag results in an increase of the activity coefficient of ZnO, γzno.
Replacement of FeO by Na2O and CaO increases γzno, and the former is more effective than the latter. When FeO is replaced by Al2O3, γzno decreases, slightly which shows that Al2O3 is a little less basic than FeO.
When the slag compositions lie in the range of the current work, a decrease of 0.1 in the mole fraction of SiO2 results in an increase of about 0.53 in γzno in the case of FeO-Fe2O3-SiO2-ZnO system, and Al2O3 does not behave as an acid oxide in both cases of FeO-Fe2O3-SiO2-Al2O3-ZnO and FeO-Fe2O3-SiO2-Al2O3-CaO-ZnO systems.
