Obtaining aqueous solution from insoluble metal oxide
AssigneeNational Research Development Corporation
InventorsDerek J. Fray, Herbert A. Hancock
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Abstract
This method of obtaining an aqueous solution of metal values from an insoluble metal oxide is possible where the metal has a lower oxidation number in the solution than in the insoluble oxide, for example manganese (+2 and +4 respectively). The oxide, such as MnO.sub.2, is treated with hot mineral acid such as HCl in the presence of coal. After some hours, the liquid comes to contain most of the manganese as dissolved Mn(II) ion.
Claims19
A method of obtaining an aqueous solution of a maganese compound from an insoluble maganese metal oxide, the manganese having a lower oxidation number in the solution than in the insoluble oxide, comprising treating the insoluble manganese oxide at about atmospheric pressure with a acid at a temperature of at least 80.degree. C. in the presence of at least 1/2 part by mass of a carbonaceous material per part of the metal oxide.
Dependencies are inferred from the claim text.