亜鉛電解採取における鉄族金属の特徴的挙動

抄録

The behavior of such impurity as Ni, Co, Fe, Ag, Cu or Cd in the electrowinning of zinc was studied. The characteristics of iron-group metals, compared with other impurities, were revealed in the impurity content of the deposits as well as its deposition rate, although the impurities studied brought about more or less higher critical current densities above which the massive zinc deposition occurred.
The SEM images of the deposits obtained from the baths containing iron-group metals were similar to that of pure zinc, while Ag, Cu and Cd affected the morphology of the deposits in a striking manner. The presence of iron-group metals in the solutions, further, resulted in the distinct pattern of the potential oscillation caused by the deposition and dissolution of cathode zinc. These phenomena were in good agreement with the deposition behavior of each impurity.
Thus, it may be necessary to distinguish the iron-group metals from other impurities in the dicussion of impurity effects in zinc electrowinning.