亜鉛電解採取における電解液中へのアルコール類添加による電解挙動

概要

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The effects of alcohol addition on the electrolytic behaviors by using Pb-Ag-Ca anodes in sulfuric acid electrolyte and industrial electrolyte for zinc electrowinning were investigated. The electrolysis additives used in the sulfuric acid electrolyte were methanol, ethylene glycol and glycerin. In the case of industrial electrolyte, ethylene glycol was added. The results are summarized as follows.Addition of each alcohol in the sulfuric acid electrolyte reduced the bath voltage and anode potential with increasing in the content of additives. Also, the bath voltage and anode potential decreased with increasing in the content of Ca in Pb-Ag-Ca anodes.To predict the oxidation reaction mechanism of ethylene glycol addition, glyoxal and oxalic acid which are oxide substances of ethylene glycol were added in the sulfuric acid electrolyte. The anode potential and the quantity of gas generated decreased with increasing concentration of each additive. During the glyoxal addition, the trend of gas generated similar to the addition of ethylene glycol. It was considered that the anode reactions were oxidation of ethylene glycol or its substances.Addition of ethylene glycol in the industrial electrolyte reduced the bath voltage and anode potential. Moreover, by using a Pb-Ag-Ca alloy anode, the bath voltage and the Pb contents in cathode zinc decreased compared with the conventional Pb-Ag anode.
社団法人資源・素材学会の論文
2004-01-25