硫化第一鉄の酸浸出反応
1976 年 92 巻 1055 号 p. 39-44
詳細
1976 年 92 巻 1055 号 p. 39-44
The leaching rate and rest potential of ferrous sulfides in sulfuric acid solutions were examined from both thermodynamic and kinetic aspects. The main results obtained in this study are as follows:
1. The leaching rate of non-stoichiometric ferrous sulfides, Fe1-αS, in an acidic solution is lowered regularly with the increase in a value.
2. This tendency is explained thermodynamically by the decrease in driving force of acid leaching reaction.
3. Ferrous sulfides decompose evolving hydrogen sulfide in an acidic solution. Also, the corresponding amount of elemental sulfur to a value deposits on the surface of sulfide particles, resulting in the retarding of leaching.
4. The rest potential of non-stoichiometric sulfide was influenced bythe concentrations of ferrous ion, hydrogen ion and hydrogen sulfide in the electrolyte and the composition of ferrous sulfide.
However, the concentrations of ferrous ion and hydrogen sulfide do not affect on the rest potential of stoichiometric ferroussulfide.
5. The leaching rate of non-stoichiometric ferrous sulfide is enhanced significantly by lowering the potential of reaction system.
