Summary
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1.
When pitchblende is dissolved in H2SO4 containing MnO2 or HNO3 as oxidizing agent, the presence of iron and copper minerals greatly accelerates the process and increases the extraction of uranium into the solution.
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2.
Of the ferric oxide minerals, limonite has the greatest effect on extraction of uranium by sulfuric acid with MnO2; of the ferrous oxide minerals, siderite, which is the most readily soluble in sulfuric acid, has the most marked effect.
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3.
When pitchblende is dissolved in a mixture of nitric and sulfuric acid, ferric oxide passes from the minerals into solution, thereby increasing the extraction of uranium. At acid mixture concentrations less than 100 g/liter, ferrous iron hasan unfavorable effect on the process.
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Literature Cited
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Additional information
Translated from Atomnaya Énergiya, Vol. 15, No. 4, pp. 313–317, October, 1963
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Alkhazashvili, G.M., Nesmeyanova, G.M. & Kuz'mina, L.N. The effect of the iron minerals in ores on oxidation of uranium in acid. At Energy 15, 1031–1035 (1963). https://doi.org/10.1007/BF01119541
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DOI: https://doi.org/10.1007/BF01119541