硫化第一鉄の酸浸出反応の速度論的研究

抄録

Kinetic study of non-oxidative leaching of synthetic ferrous sulfides in aqueous hydrochloric acid solutions has shown that the leaching rate is directly proportional to both the concentration of acid and the surface area of ferrous sulfides.
Rate constants for the acid leaching reaction exhibits an activation energy of 9.5 kcal/mol regardless of the stoichiometry of sample powders, and this fact suggests that the overall reaction is interface reaction controlled. However, the leaching rate of stoichiometric ferrous sulfide dissolves much faster than non-sto chiometric ore.
Acceleration effect of the dissolution of ferrous sulfides at low PH₂S range of gaseous phase may be attributed to the increase in effective surface area due to the change of adsorption of hydrogen sulfide on the sample surface.