1N硫酸溶液中におけるβ-ZnSの懸濁電解浸出時の白金陽極のインピーダンス挙動について

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  • A Study of Impedance Behaviour of Pt Anode in β-ZnS Suspension-Electrolysis Leaching in 1N H<SUB>2</SUB>SO<SUB>4</SUB> Solution
  • 1N リュウサン ヨウエキチュウ ニ オケル ベータ ZnS ノ ケンダク デ
  • A Study of Impedance Behaviour of Pt Anode in &beta;-ZnS Suspension-Electrolysis Leaching in 1N H<SUB>2</SUB>SO<SUB>4</SUB> Solution

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The suspension-electrolysis method was applied to driect leaching of metal sulfides. The anodic dissolution mechanism of β-ZnS in the suspension-electrolysis with a Pt anode was investigated in terms of the interfacial impedance and voltammgram on the anode. The results obtained are as follows:<BR>(1) In a low electrode potential region in the anodic suspension-electrolysis of β-ZnS alone, the anodic reaction on the Pt anode is mainly the oxidation of H2S due to the H2S evolution-dissolution reaction of β-ZnS in acidic solution. The anodic reaction is controlled by charge-transfer and diffusion, simultaneously.<BR>(2) In the anodic suspension-electrolysis, suspension-graphite particles are oxidized on the Pt anode electrochemically and have a higher potential. In the presence of β-ZnS, they restrain its dissolution with H2S evolution, and then it is dissolved by the S0 product-reaction by the galvanic reciprocal reactions with these oxidized graphite particles. The anodic reaction on the Pt anode in co-suspension of β-ZnS and graphite powder, is mainly the oxidation of the latter.<BR>(3) In the presence of Fe3+, β-ZnS is dissolved by the reaction, ZnS+2Fe3+=Zn2++2Fe2++S0. The anodic reaction on the Pt anode is mainly the oxidation of product Fe2+ and is controlled by the charge-transfer reaction of Fe2+/Fe3+.<BR>(4) Upon suspension-electrolysis of β-ZnS in co-suspending graphite powder and added Fe3+, the oxidation current is remarkably large. The anodic reaction on the Pt anode is also mainly controlled by the charge-transfer reaction of Fe2+/Fe3+.

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