マンガンノジュールの二段硫酸浸出におけるコバルトの挙動

概要

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Two stage sulfuric acid leachings of metal values from manganese nodule consisting of the selective recovery of copper and nickel in the first stage, and leaching of cobalt in the second stage from roasted products of the residue from the first stage leaching have been studied. Cobalt recovery was more than 38% from the products roasted at 300°∿600℃ and the total highest recovery of 48.6% was obtained at the roasting temperature of 400℃. It was also found that the higher the roasting temperature, the more the manganese recovery and the less the iron recovery. Serious decrease in metal recovery in the second leaching of the products roasted at 700° or 800℃ was attributable to the formation of more stable mineral, bixbyite (Mn, Fe)_2O_3 found by the x-ray powder diffraction, which was also confirmed by the specific surface area measurements and the scanning electron microscopic observations on the surface textures.
山口大学の論文