Dissolving Uranium in Nitric Acid

Lacher, J. R.; Salzman, J.D.; Park, J. D.

doi:10.1021/ie50616a023

Cited by 14 publications

(9 citation statements)

References 2 publications

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“…Experiments [6] show that stimng decreases dissolution rate. Similar explanations as those reported for UO, are given.…”

Section: Influence Of Stirring On Dissolutionmentioning

confidence: 97%

“…The rate for samples cut from a rolled rod increased as the fraction of the total surface area perpendicular to the axis of the rod was increased [6], so dissolution rate is often expressed as rod lenght per unit of time. Value given in [9] is 0.175 mmAI for empty rods of irradiated uranium (external diameter = 9.5 cm; internal diameter = 7.7 cm; lenght = 34 cm) dissolved in nitric acid 6.5 N at boiling temperature.…”

Section: General Aspects On Dissolution Of U : Literature Surveymentioning

confidence: 99%

“…Real specific surface area, related to density, has a great effect on dissolution rate. [6] reports that samples with small grain sizes (due to metallurgical treatment of rolling) dissolve quickly. Values of initial dissolution rates are given in the…”

Section: General Aspects On Dissolution Of U : Literature Surveymentioning

confidence: 99%

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Dissolution of sludges containing uranium dioxide and metallic uranium in nitric acid

Flament¹

1998

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“…Experiments [6] show that stimng decreases dissolution rate. Similar explanations as those reported for UO, are given.…”

Section: Influence Of Stirring On Dissolutionmentioning

confidence: 97%

Section: General Aspects On Dissolution Of U : Literature Surveymentioning

confidence: 99%

See 1 more Smart Citation

Dissolution of sludges containing uranium dioxide and metallic uranium in nitric acid

Flament¹

1998

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“…The rate also increases with increasing nitric acid, or total nitrate, concentrations. The dissolution rate of uranium metal in 3 M to 12 M HNO 3 at 25°C was studied (Lacher et al 1961). The rate decreases by a factor of ~300,000 per decade decrease in HNO 3 concentration in this range and is about 5×10…”

Section: 4mentioning

confidence: 99%

Uranium Metal Analysis via Selective Dissolution

Delegard¹,

Sinkov²,

Schmidt³

et al. 2008

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SummaryUranium metal, which is present in sludge held in the Hanford Site K West Basin, can create hazardous hydrogen atmospheres during sludge handling, immobilization, or subsequent transport and storage operations by its oxidation/corrosion in water. A thorough knowledge of the uranium metal concentration in sludge therefore is essential to successful sludge management and waste process design.The goal of this work was to establish a rapid routine analytical method to determine uranium metal concentrations as low as 0.03 wt% in sludge even in the presence of up to 1000-fold higher total uranium concentrations (i.e., up to 30 wt% and more uranium) for samples to be taken during the upcoming sludge characterization campaign and in future analyses for sludge handling and processing. This report describes the experiments and results obtained in developing the selective dissolution technique to determine uranium metal concentration in K Basin sludge. The work described in this report:• provides a technical underpinning of the validity of the selective dissolution method, including the influence of various sludge components, in five test series using simulated and genuine sludges of widely varying composition• establishes analytical parameters (concentrations, quantities, temperatures, and times) necessary to develop the selective dissolution sludge-digestion analytical procedure.The uranium metal detection limit is estimated to be about 0.004 wt% based on the testing performed with actual sludge, thus meeting the goal detection limit of 0.03 wt%. The detection limit largely is established by the trace residual uranium carryover that exists in the leached and rinsed sludge. In the final series of method validation tests using actual K Basin sludge, spiked with uranium metal at concentrations ranging from 0.025 to 1.29 wt%, uranium metal recoveries averaged 99.4% with a standard deviation of 3.3%.

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“…Nitrous acid is known to play a similar r6le in the dissolution in nitric acid of a number of metals 12 including uranium. 11 Under conditions of low dissolution rate, at least, it is apparent that the reaction does not behave as a diverging chain reaction but operates in the quasi-stationary regime 12 as would be expected witli complete kinetic control. A marked reduction in dissolution rate on increasing the degree of agitation is typical of this t ype of autocatalytic process.…”

Section: Taylor Et Al-dissolution Of Uralvium Dioxidementioning

confidence: 99%