Codeposition Behavior of Impurities in Electrolytic Production of Iron.

AKIYAMA Tetsuya, FUKUSHIMA Hisaaki, SUNACHI Naoya

doi:10.2473/shigentosozai.111.867

Codeposition behaviors of Cu, Cd, Pb, Sn, Ni, Co, Zn and Mo with Fe have been studied in chloride and sulfate baths. The results obtained are as follows: (1) The single deposition of Fe proceeded with significant overvoltage, the degree of which depended on the type of electrolyte and temperature. (2) The codeposition of Cu and Cd with Fe was found to be regular type, resulting in higher contents of these impurities in the deposits than in the baths. (3) The codeposition behavior of Pb from chloride bath was similar to those of Cu and Cd. However, the content of the impurities in the deposits obtained from Pb-containing sulfate bath and Sn-containing chloride and sulfate baths was lowered by the precipitation of Pb sulfate and Sn hydroxide in the baths. (4) The contents of Ni and Co in the deposits showed lower value. This indicates the anomalous codeposition of Ni and Co with Fe, i. e., the preferential deposition of Fe over the wide range of electrolysis condition. (5) In the baths containing Zn²⁺, the anomalous codeposition in which less noble Zn deposits preferentially occurred. In this case, the codeposition of electrochemically less noble Zn should be considered to produce high purity Fe. (6) Mo content in the deposits decreases with an increase in current density to become less than 1% at higher current densities.

Codeposition Behavior of Impurities in Electrolytic Production of Iron.

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