塩化第二鉄水溶液中における硫化第一鉄の酸化反応
1977 年 93 巻 1071 号 p. 377-382
詳細
1977 年 93 巻 1071 号 p. 377-382
Kinetic study of the oxidative leaching of synthetic ferrous sulfides in an aqueous ferric chloride solution was made.The principal results obtained are as follows:(1) A rate equation appliciable to the leaching reaction, in which both the surface area of powdered materials and the concentration of leachant change significantly, was derived.
(2) The main leaching reaction of ferrous sulfide is the oxidative reaction forming elemental sulfur, but this reaction is depressed by competitive reaction of acid leaching below pH 1.
(3) The oxidative leaching of stoichiometric ferrous sulfide proceedes faster than non-stoichiometric ore.
(4) Rate equation for the oxidative leaching of ferrous sulfide with ferric chloride is found to be R=K·A·(Fe3+) and Ea=12.0 kcal/mol (49.98 at % Fe) and 14.5 kcal/mol (46.93 at % Fe)
From this, a chemically controlled direct oxidation mechanism is proposed.
