The dissolution of quartz in dilute aqueous solutions of organic acids at 25°C

Bennett, Philip C.; Melcer, Michael E.; Siegel, Donald I.; Hassett, John P.

doi:10.1016/0016-7037(88)90222-0

Cited by 291 publications

(104 citation statements)

References 26 publications

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“…Because humics have a strong ability to interact with metal ions, oxides, hydroxides, and minerals to form water-stable associations, investigators have suggested that humic acids may accelerate dissolution rates of silicate materials by attacking the Si-O bond. For example, Bennett et al [29] found that dissolution rates of quartz are faster in the presence of humic acid at pH = 7 compared to rates in solutions containing no organic acids. Gin et al [30] conducted batch experiments with R7T7 high-level waste glass in pH 7.3 solutions containing up to 5 g/L humic acid (a commercial humic acid product from Fluka).…”

Section: Effects Of Humic and Fulvic Acidmentioning

confidence: 99%

Waste Form Release Data Package for the 2001 Immobilized Low-Activity Waste Performance Assessment

McGrail¹,

Icenhower²,

Martin³

et al. 2001

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SUMMARYThis data package documents the experimentally derived input data on the representative waste glasses LAWABP1 and HLP-31 that will be used for simulations of the immobilized lowactivity waste disposal system with the Subsurface Transport Over R eactive Multiphases (STORM) code. The STORM code will be used to provide the near-field radionuclide release source term for a performance assessment to be issued in March of 2001. Documented in this data package are data related to 1) kinetic rate law parameters for glass dissolution, 2) alkali-H ion exchange rate, 3) chemical reaction network of secondary phases that form in accelerated weathering tests, and 4) thermodynamic equilibrium constants assigned to these secondary phases. The kinetic rate law and Na + -H + ion exchange rate were determined from single-pass flow-through experiments. Pressurized unsaturated flow and vapor hydration experiments were used for accelerated weathering or aging of the glasses. The majority of the thermodynamic data were extracted from the thermodynamic database package shipped with the geochemical code EQ3/6. However, several secondary reaction products identified from laboratory tests with prototypical LAW glasses were not included in this database, nor are the thermo dynamic data available in the open literature. One of these phases, herschelite, was determined to have a potentially significant impact on the release calculations and so a solubility product was estimated using a polymer structure model developed for zeolites.Although this data package is relatively complete, final selection of ILAW glass compositions has not been done by the waste treatment plant contractor. Consequently, revisions to this data package to address new ILAW glass formulations are to be regularly expected.v CONTENTS

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Section: Effects Of Humic and Fulvic Acidmentioning

confidence: 99%

Waste Form Release Data Package for the 2001 Immobilized Low-Activity Waste Performance Assessment

McGrail¹,

Icenhower²,

Martin³

et al. 2001

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“…This study examined the hydrothermal production of carboxylic acid and other aqueous organic species due to thermal degradation of diesel fuel at elevated temperatures. Carboxylic acids are particularly significant because they are known to form complexes with common rock forming cations, and thus can enhance mineral dissolution rates and mineral volubility (e.g., Bell et al, 1992;Gestsdottir and Manning, 1992;Hajash et al, 1992;Fein, 1991;Bennett et al, 1988). Carboxylic aads are also known to accelerate the corrosion of steel and other alloys Fontana and Green, 1978;Larrabee and Mathay, 1963).…”

Section: Abiotic Chemistrymentioning

confidence: 99%

Volume II: near-field and altered-zone environment report

Wilder¹

1996

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“…Oxygen links in minerals are broken and ions present in solution are chelated via carboxyl and hydroxyl functional groups [66,67]. Polyfunctional acids like oxalic acid enhance the dissolution of silicates by creating an imbalance between cation and anion concentrations in solution [68][69][70][71][72] but they can also protect calcareous rocks through the formation of, for example, calcium oxalate films [73,74]. Sterflinger [75] collated fungal species reported to colonise building stones (sandstone, marble and granite) and, where known, listed the acids produced by them.…”

Section: Bio-generation Of Organic Acids and Chelating Agentsmentioning

confidence: 99%

Review of Biohydrometallurgical Metals Extraction from Polymetallic Mineral Resources

Watling

2014

Minerals

137

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This review has as its underlying premise the need to become proficient in delivering a suite of element or metal products from polymetallic ores to avoid the predicted exhaustion of key metals in demand in technological societies. Many technologies, proven or still to be developed, will assist in meeting the demands of the next generation for trace and rare metals, potentially including the broader application of biohydrometallurgy for the extraction of multiple metals from low-grade and complex ores. Developed biotechnologies that could be applied are briefly reviewed and some of the difficulties to be overcome highlighted. Examples of the bioleaching of polymetallic mineral resources using different combinations of those technologies are described for polymetallic sulfide concentrates, low-grade sulfide and oxidised ores. Three areas for further research are: (i) the development of sophisticated continuous vat bioreactors with additional controls; (ii) in situ and in stope bioleaching and the need to solve problems associated with microbial activity in that scenario; and (iii) the exploitation of sulfur-oxidising microorganisms that, under specific anaerobic leaching conditions, reduce and solubilise refractory iron(III) or manganese(IV) compounds containing multiple elements. Finally, with the successful applications of stirred tank bioleaching to a polymetallic tailings dump and heap bioleaching to a polymetallic black schist ore, there is no reason why those proven technologies should not be more widely applied.

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The dissolution of quartz in dilute aqueous solutions of organic acids at 25°C

Cited by 291 publications

References 26 publications

Waste Form Release Data Package for the 2001 Immobilized Low-Activity Waste Performance Assessment

Waste Form Release Data Package for the 2001 Immobilized Low-Activity Waste Performance Assessment

Volume II: near-field and altered-zone environment report

Review of Biohydrometallurgical Metals Extraction from Polymetallic Mineral Resources

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