Zinc chloride electrowinning presents difficulties in obtaining smooth, compact and dendrite free deposits with a high current efficiency due to the presence of undesirable metal ions. However, it is hard to define a level of impurities tolerable in zinc deposition, and despite a lot of research in this field, the reaction mechanisms of the undesired metal ions are still not clearly understood. In this study, the influence of Fe, Cd, Co, Ni and Cu additions were investigated, as well as their synergic effect on the zinc electrodeposition process from chloride electrolytes and on the obtained deposit morphology. The tests were all performed in presence of TBAC1 which reduces the harmful effect of such impurities on the zinc reduction.
Effect of impurity presence in zinc chloride electrowinning / Lupi, Carla; Pilone, Daniela; E., Beltowska Lehman. - STAMPA. - 2:(2003), pp. 1195-1203. (Intervento presentato al convegno 5th International Symposium on Hydrometallurgy in honor of Ian M Ritchie tenutosi a VANCOUVER, CANADA nel AUG 24-27, 2003).
Effect of impurity presence in zinc chloride electrowinning
LUPI, Carla;PILONE, Daniela;
2003
Abstract
Zinc chloride electrowinning presents difficulties in obtaining smooth, compact and dendrite free deposits with a high current efficiency due to the presence of undesirable metal ions. However, it is hard to define a level of impurities tolerable in zinc deposition, and despite a lot of research in this field, the reaction mechanisms of the undesired metal ions are still not clearly understood. In this study, the influence of Fe, Cd, Co, Ni and Cu additions were investigated, as well as their synergic effect on the zinc electrodeposition process from chloride electrolytes and on the obtained deposit morphology. The tests were all performed in presence of TBAC1 which reduces the harmful effect of such impurities on the zinc reduction.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
