The Functional Dependence of Leaching on The Surface Area-To-Solution Volume Ratio

Machiels, Albert J.; Pescatore, C.

doi:10.1557/proc-15-209

Cited by 5 publications

(5 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Note that the present data cannot be represented by a steady function of product of SAJV and t 1 ( Fig. 6), as has been suggested by several studies [28,29]. The successful scaling of waste glass dissolution data by the product of SA/V and t0.5 has been recently suggested by Grambow et al [30] and Van lseghem et al [31] as evidence for a diffusion-controlled dissolution mechanism.…”

Section: Oo -O'r-supporting

confidence: 54%

ANL technical support program for DOE Environmental Restoration and Waste Management. Annual report, October 1991--September 1992

Bates¹,

Bradley²,

Buck³

et al. 1993

View full text Add to dashboard Cite

show abstract

Section: Oo -O'r-supporting

confidence: 54%

ANL technical support program for DOE Environmental Restoration and Waste Management. Annual report, October 1991--September 1992

Bates¹,

Bradley²,

Buck³

et al. 1993

View full text Add to dashboard Cite

show abstract

“…The hypothesis that the rate of corrosion of borosilicate glass is controlled by the dissolution affinity and in particular by the silicic acid concentration in solution can be used to explain observed surface area-to-solution volume (SA/V) ratio [19,20] and flow effects [21,22]. However, despite the broad evidence for, and success of the dissolution affinity rate control hypothesis, there is evidence that the surface alteration layers can be important under some circumstances.…”

Section: Waste Glass Corrosionmentioning

confidence: 99%

High-Level Nuclear-Waste Borosilicate Glass: A Compendium of Characteristics

et al. 1992

View full text Add to dashboard Cite

With the imminent startup, in the United States, of facilities for vitrification of high-level nuclear waste, a document has been prepared that compiles the scientific basis for understanding the alteration of the waste glass products under the range of service conditions to which they may be exposed during storage, transportation, and eventual geologic disposal. A summary of selected parts of the content of this document is provided.Waste glass alterations in a geologic repository may include corrosion of the glass network due to groundwater and/or water vapor contact. Experimental testing results are described and interpreted in terms of the underlying chemical reactions and physical processes involved. The status of mechanistic modeling, which can be used for long-term predictions, is described and the remaining uncertainties associated with long-term simulations are summarized. INTRODUCTION AND BACKGROUND

show abstract

“…SA/V = surface area to volume ratio (meters The significance of the surface area to volume ratio in leaching processes is described in Machiels and Pescatore (1983), Pederson et al (1983), White (1986) and Scheetz et al (1981).…”

Section: Concerns With Surface Areamentioning

confidence: 99%

Refinement of ADTI-WP2 Standard Weathering ProcEdures, and Evaluation of Particle Size and Surface Area Effects upon Leaching Rates: PART 2: PRACTICAL AND THEORETICAL ASPECTS OF LEACHING KINETICS

Brady¹,

White²,

Hornberger³

et al. 2004

JASMR

View full text Add to dashboard Cite

Most previous coal mine drainage leaching studies have not investigated the effect of surface area, effects of elevated Pco 2 , which are typical of mine spoil, and solubility constraints on water chemistry. The leaching column and humidity cell tests were designed to evaluate the importance of these parameters. Surface area was examined on three rock types before and after leaching: the Brush Creek shale; a well-indurated calcareous sandstone; and a coal refuse. The surface area, as measured by BET, for the shale was an order of magnitude greater than the other rock types. Surface area after leaching decreased slightly for the shale, and by half for the refuse. The sandstone area remained the same. Plots of sulfate concentration through time closely resemble those expected for diffusioncontrolled kinetics. Plots of alkalinity through time are characteristic of a material that dissolves quickly at first and then approaches or reaches saturation. Saturation with respect to calcite was confirmed by equilibrium calculations. The water in the leaching columns was undersaturated with respect to gypsum, indicating that sulfate was a conservative parameter and could be used to measure pyrite oxidation rates. The target 10% CO 2 was achieved in the column tests, but not achieved in the humidity cell tests. At the end of 12 to 14 weeks, between 1.5 and 2% of the calcite and between 4 and 6% of the sulfur in the rock had been removed by weathering. Predictions, based on power function equations, indicate that the Brush Creek shale sample would remain alkaline even if weathered for years. Comparisons between leaching chemistry and field data for the Brush Creek shale and the coal refuse sample showed similar water chemistry.

show abstract

The Functional Dependence of Leaching on The Surface Area-To-Solution Volume Ratio

Cited by 5 publications

References 3 publications

ANL technical support program for DOE Environmental Restoration and Waste Management. Annual report, October 1991--September 1992

ANL technical support program for DOE Environmental Restoration and Waste Management. Annual report, October 1991--September 1992

High-Level Nuclear-Waste Borosilicate Glass: A Compendium of Characteristics

Refinement of ADTI-WP2 Standard Weathering ProcEdures, and Evaluation of Particle Size and Surface Area Effects upon Leaching Rates: PART 2: PRACTICAL AND THEORETICAL ASPECTS OF LEACHING KINETICS

Contact Info

Product

Resources

About