Study of the dissolution of compact uraninite sample by sulfuric acid solutions (in Russian)
The rate of dissolution of uraninite samples in sulfuric acid solutions depends not only on the oxygen-to-uranium ratio, but also on the phase composition of the sample. Uraninite samples can be divided into three groups, which are distinguished by crystal lattice parameters, microhardness, and penetration depth of the surface layer. The most readily soluble is the uraninite formed on decomposition of coffinite. The lattice parameter of this compound is a = 5.36 - 5.39 A; the microhardness is 200 to 400 kg/cm/sup 2/, and the surface penetration thickness is 1.1 to 2.5 microns. Uraninite samples have a spottied distribution of insoluble sections, which are characterized by a lattice parameter a = 5.40 -- 5.41 A, a microhardness of 500 to 700 kg/cm/sup 2/, and a penetration thickness of 0.1 to 0.5 microns. The least soluble in sulfuric acid solutions are uraninite samples with a lattice parameter a = 5.43 A, a microhardness of 950 to 1000 kg/mm/sup 2/, and a penetration of 0 to 0.1 microns. In its physical properties this uraninite is a natural analogue of synthetic cubic uranium oxide (U/sub 4/O/sub 3/). (SJR)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-29-015563
- OSTI ID:
- 4347248
- Journal Information:
- At. Energ. (USSR), v. 35, no. 1, p. 48, Journal Name: At. Energ. (USSR), v. 35, no. 1, p. 48; ISSN AENGA
- Country of Publication:
- Country unknown/Code not available
- Language:
- Russian
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