Study of the cathodic processes during the nickel electrowinning from ammonia-ammonium chloride solutions

摘要

The Ezinex~R process has been commercialized in Italy for the electrowinning of zinc from zinc ammonia chloride solutions.In this process,zinc is electrodeposited at the cathode and ammonia is oxidized at the anode.Titanium cathodes are used for zinc plating and graphite electrodes are used for anodic oxidation of ammonia.The electro-deposition of nickel from ammonium chloride solutions may offer alternatives to diminish the hydrogen reduction on acid sulfate or acid chloride electrowinning.The nickel deposition at the cathode can be expressed by the reaction.