酸性塩化第一銅水溶液中におけるマンガン酸化物の還元浸出反応

抄録

The reductive leaching reaction of manganese oxides in acidic cuprous chloride solutions was studied from both thermodynamic and kinetic points of view, carrying out the determination of the leaching rates, the measurement of rest potentials and so on. A rotating disc technique was empolyed in this study.
Experimental results obtained are as follows:
(1) The reductive leaching reaction of manganese oxides in acidic cuprous chloride solutions is expressed as:
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\ oindentThe leaching rates were of the first oder with respects to the concentration of aqueous cuprous chloride, while no distinct dependence was observed for the acid concentration.
(2) The reductive leaching rates of manganese oxides were influenced greatly by the stoichiometry of the ores. Reaction with manganese dioxide proceeds faster than that with Mn₂O₃ or Mn₃O₄. This tendency is explained thermodynamically by a decrease in driving force of the leaching reaction.
(3) The overall reaction of reductive leaching of manganese oxides in acidic cuprous chloride solutions is controlled by a mass transfer of cuprous ions through a boundary layer between the acid solution and the surface of the ore.
(4) The rest potentials of the manganese oxides were influenced greatly by the chemical composition of the ore and the hydrogen ions.