Abstract
The rate of dissolution of metal ions from two different deep-sea manganese nodule samples in dilute sulfuric acid solutions was studied. The addition of high concentrations of sodium and calcium salts was observed to increase the apparent kinetics of extraction and this has been interpreted in terms of the physical and chemical nature of nodules and their component minerals. The dissolution of copper and soluble cobalt was found to be very sensitive to the acid concentration and to be controlled by pore diffusion, while nickel dissolution was found to be controlled by chemical reaction. A pore model has been developed for the leaching of copper and cobalt.
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