Effect of Cations on Aluminum Speciation Under Alkaline Conditions

Taylor-Pashow, K.; Hobbs, D.

doi:10.2172/1050619

Cited by 1 publication

(1 citation statement)

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“…[13] However, the sodium aluminate is metastable and will remain in solution for at 100h in a 1.5-2 fold excess of caustic. The sodium aluminate will eventually convert to insoluble aluminum oxide, determined by XRD to be gibbsite, boehmite (AlO(OH)), [14,15] , or bayerite (β-Al(OH)3), depending on the temperature and minor chemicals, [16] and a variety of other process variables. [17,18,19] To ensure that solids formation is not a problem, supersaturation conditions should be avoided.…”

Section: Fig 1 Predicted Solubility Of Aluminum As a Function Of Free Hydroxide Concentrationmentioning

confidence: 99%

Aluminum Target Dissolution in Support of the Pu-238 Program

McFarlane¹,

Benker²,

DePaoli³

et al. 2014

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Selection of an aluminum alloy for target cladding affects post-irradiation target dissolution and separations. Recent tests with aluminum alloy 6061 yielded greater than expected precipitation in the caustic dissolution step, forming up to 10 wt.% solids of aluminum hydroxides and aluminosilicates. We present a study to maximize dissolution of aluminum metal alloy, along with silicon, magnesium, and copper impurities, through control of temperature, the rate of reagent addition, and incubation time. Aluminum phase transformations have been identified as a function of time and temperature, using X-ray diffraction. Solutions have been analyzed using wet chemical methods and X-ray fluorescence. These data have been compared with published calculations of aluminum phase diagrams. Temperature logging during the transients has been investigated as a means to generate kinetic and mass transport data on the dissolution process. Approaches are given to enhance the dissolution of aluminum and aluminosilicate phases in caustic solution.

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