The Experimental Investigation of the Conditions of Uranium Transport and Deposition by Hydrothermal Solutions; EKSPERIMENTAL'NYE ISSLEDOVANIYA USLOVII PERENOSSA I OTLOZHENIYA URANA GIDROTERMAL'NYMI RASTVORAMI

Technical Report · Sat Oct 31 04:00:00 EST 1959

OSTI ID:4286651

Rafal'skii, R P

The investigations were carried out in accordance with the up-to-date concept on the transport of hexavalent uranium under hydrothermal conditions and its precipitation as a result of reduction. The study of the stability of sodium uranyl tricarbonate showed that it is decomposed with precipitation of uranates at a temperature of about 100 deg C. It has been found that hexavalent uranium is reduced by hydrogen sulfide both in acid sulfate and carbonate solutions at elevated temperatures. In carbonate solutions uranium is reduced even at room temperature. In this case the reaction proceeds in a neutral or even slightly acid medium in the presence of H/sub 2/S and CO/sub 2/. In excess of H/sub 2/S the reaction resuits practically in complete reduction of hexavalent uranium. At an elevated temperature and pressure uranium is reduced and precipitated from uranyl sulfate solutions by pyrite, chalcopyrite. galerta, siderite. homblende, or organic components of carbonaceous shales. The end product of the reduction is usually crystalline uraninite. The data obtained indicate the possibility of hexavalent uranium being transported by hydrothermal solutions and deposited as a result of reduction process. At the same time the values of solubility of freshly precipitated uranium dioxide at elevated temperatures determined experimentally make it possible to assume that under hydrothermal conditions uranium could migrate in its tetravalent form as well. (auth)

• Research Organization: U.S.S.R.
• NSA Number: NSA-13-006405
• OSTI ID: 4286651
• Report Number(s): A/CONF.15/P/2067
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ACIDITY
ALUMINUM SILICATES
CALCIUM SILICATES
CARBONATES
CHALCOPYRITE
CHEMISTRY
CLAYS
COPPER SULFIDES
CRYSTALS
DECOMPOSITION
DEPOSITS
ELECTRONS
GALENA
GEOCHEMISTRY
HIGH TEMPERATURE
HORNBLENDE
HYDROGEN SULFIDES
HYDROLOGY
IRON CARBONATES
IRON SILICATES
IRON SULFIDES
LEAD SULFIDES
MAGNESIUM SILICATES
MEASURED VALUES
MINERALS
ORGANIC COMPOUNDS
PRECIPITATION
PRESSURE
PYRITE
REDUCTION
SIDERITE
SOLUTIONS
SULFATES
TEMPERATURE
URANATES
URANIUM COMPOUNDS
URANIUM DIOXIDE
URANYL COMPOUNDS
VALENCE
WATER