酸素と硫黄のポテンシャルを同時に制御する混合ガス雰囲気について
1975 年 91 巻 1054 号 p. 785-790
詳細
1975 年 91 巻 1054 号 p. 785-790
In the fundamental study on the non-ferrous pyrometallurgy, many experiments must be carried out under the conditions of the constant oxyten and the constant sulfur potentials, In such a case those potentials are controlled by using appropriate gas mixtures. The present study was undertaken in order to confirm the oxygen potentials of such gas mixtures by means of the following oxygen concentration cell,
O2 (in gas mixture)/ ZrO2+ (CaO)/O2 (in air).
The oxygen potentials of gas mixture CO2-SO2-H2-Ar were measured (1) for various initial mixing ratios of CO2-H2-SO2 at constant Ar mole fraction of 0.5 and 1200°C, and (2) for various initial mixine ratios of CO2-H2, at contant Ar mole fraction of 0.5 and SO2 moletraction of 0.005 and 1300°C. In each case the total pressure was kept 1 atm.
Also the theoretical oxygen potentials of such gas mixtures were calculated based on the material balance and the mass action law for the relating many chemical reactions, using the available data of free energies. In such calculation these gas mixtures were assumed to be ideal.
From the present experiment it was found that the oxygen potentials of the gas mixtures were in good agreement with the calculated values. Furthermore, based on such calculation, the oxygen and the sulfur potentials of different eight gas mixtures were estimated at 1300°C and these results were shown in Po2vsPs2 space.
