Abstract
The effect of addition of buffering agent in sodium chloride solution has been studied for the extraction of metals from sea-nodules by electrochemical leaching method. These experiments were performed in a glass cell, containing at one end a closed refractory diaphragm tube having a ground sea-nodules mixture with a platinum wire spiral as an inert anode and two identical titanium plates as cathodes. The influence of various concentration ratios of buffering agent to buffering agent and sodium chloride concentration (NH4Cl/NH4Cl + NaCl) on leaching rate was studied by keeping other conditions constant. The results indicate that, with the increase in concentration ratio, total metal recovery (%) increases up to a certain value, above which it decreases, whereas metal recovery at the cathode deposit increases continuously with the increase in the concentration ratio. The leaching rates of metals (Cu, Ni, Co, Mn and Fe) are compared. The difference in leaching rate is explained. The experimental results of the present work are also compared with those available in the literature. The agreement is good.
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