溶存酸素を利用した銅電解液の不純物制御

概要

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To improve the purification process in copper electrorefining, the effect of dissolved oxygen in the copper electrolyte on the dissolution of some impurities in the anode was investigated. It is found that the dissolution of antimony can be controlled by the dissolved oxygen while it gives a small effect for bismuth and no effect for arsenic. It is considered that antimony is oxidized in a layer of the slime formed on a surface of the anode. The dissolution of antimony is influenced by lead and arsenic in the anode, and the dissolution is accelerated when the arsenic content in the anode was between 0.1 and 0.2 % while it is decreased with the increase of lead content.The electrowinning by means of pulse electrolysis has been proposed as the most effective process for generating the dissolved oxygen.Controlling the dissolution of minor elements in the anode is a kind of purification, and the impurities can be controlled by suppressing their dissolution with a help of the dissolved oxygen. The proposed process has an advantage as it can be operated without any special equipment.
社団法人資源・素材学会の論文
2001-12-25