Chapter 7. FELDSPAR DISSOLUTION KINETICS

Blum, Alex E.; Stillings, Lisa L.

doi:10.1515/9781501509650-009

Cited by 210 publications

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“…for H ? (Blum and Stillings 1995;Muir and Nesbitt 1997;Muir et al 1990a, b;Scheweda et al 1997) results in an increase in solution pH (Blum and Stillings 1995). Second, Al 3?…”

Section: Plagioclase Reactivitymentioning

confidence: 95%

“…Blum and Stillings 1995;Carroll and Knauss 2005;Casey et al 1989;Inskeep et al 1991;Muir et al 1989Muir et al , 1990aSchweda et al 1997). This dissolution generates an Al-Na-Ca-poor thin layer (which is consequently enriched in Si) at the plagioclase surface (Blum and Stillings 1995). The formation of silica enriched residual layers on feldspars in acidic solution is a multi-step process.…”

Section: Plagioclase Reactivitymentioning

confidence: 99%

“…Dilute acidic conditions produce relatively thick Si-rich layers, up to several thousands of Å (e.g. Blum and Stillings 1995;Casey et al 1989;Hellmann et al 2003;Muir andNesbitt 1992, 1997), whereas dissolution at near-neutral pH produces only thin leached layers of tens of Å between pH 5 and 8 (Blake and Walter 1999;Blum and Stillings 1995;Muir and Nesbitt 1997). The circumneutral environments prevailing in the Tio mine waste rock kinetic tests should promote the formation of such thin leached layers (tens of Å ) on the plagioclase feldspar surfaces.…”

Section: Plagioclase Reactivitymentioning

confidence: 99%

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Predicting Geochemical Behaviour of Waste Rock with Low Acid Generating Potential Using Laboratory Kinetic Tests

2010

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Prediction of contaminated neutral drainage using laboratory kinetic tests designed for acid mine drainage prediction is challenging because of the low metal concentrations generated by low sulfide oxidation rates. Fresh and weathered samples from the Tio mine waste rock piles were submitted to humidity cell tests. The waste rocks were demonstrated to be non-acid generating in the long term, as interpreted by conservative oxidation-neutralization curves. The results demonstrate that even though the main neutralizing minerals react differently after 25 years of natural weathering (with regard to Ca, Mg, Al, and Si release), the response of the fresh waste rocks during humidity cell leaching was very similar to those of the weathered waste rocks, when considering all the elements related to silicate dissolution, including those implicated in secondary phase precipitation. However, Ni generation was greater in the weathered waste rocks even though sulfide oxidation rates were similar, as Ni sorption properties reach saturation. Although the Ni concentrations from the leachates of humidity cell tests remain below regulated values, they are bound to increase with continued weathering if no preventive or control measures are undertaken at the site.

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“…for H ? (Blum and Stillings 1995;Muir and Nesbitt 1997;Muir et al 1990a, b;Scheweda et al 1997) results in an increase in solution pH (Blum and Stillings 1995). Second, Al 3?…”

Section: Plagioclase Reactivitymentioning

confidence: 95%

Section: Plagioclase Reactivitymentioning

confidence: 99%

Section: Plagioclase Reactivitymentioning

confidence: 99%

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Predicting Geochemical Behaviour of Waste Rock with Low Acid Generating Potential Using Laboratory Kinetic Tests

2010

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“…The series range from albite to anorthite end members with respective compositions of NaAlSi 3 O 8 and CaAl 2 Si 2 O 8 , where Na and Ca atoms can substitute for each other in the mineral's crystal lattice structure. Plagioclase dissolution has long been known to be incongruent, with Al, Na, and Ca being preferably dissolved at the surface (Blum and Stillings 1995;Carroll and Knauss 2005;Casey et al 1989;Inskeep et al 1991;Muir et al 1989Muir et al , 1990aSchweda et al 1997). This dissolution generates an Al-Na-Ca-poor thin layer at the plagioclase surface (Blum and Stillings 1995).…”

mentioning

confidence: 99%

“…Plagioclase dissolution has long been known to be incongruent, with Al, Na, and Ca being preferably dissolved at the surface (Blum and Stillings 1995;Carroll and Knauss 2005;Casey et al 1989;Inskeep et al 1991;Muir et al 1989Muir et al , 1990aSchweda et al 1997). This dissolution generates an Al-Na-Ca-poor thin layer at the plagioclase surface (Blum and Stillings 1995). The formation of silica-enriched residual layers on feldspars in acidic solution is a multi-step process, in which Ca and Na are incongruently released from the surface, followed by Al, and finally by Si in a later weathering stage (Blum and Stillings 1995;Muir and Nesbitt 1997;Muir et al 1990b;Schweda et al 1997).…”

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confidence: 99%

Kinetic Testing and Sorption Studies by Modified Weathering Cells to Characterize the Potential to Generate Contaminated Neutral Drainage

2010

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Techniques developed for acid mine drainage (AMD) prediction might not be suitable for contaminated neutral drainage (CND) generating sites. The Tio mine waste is known to generate Ni contaminated neutral drainage in some of the piles, but humidity cell tests fail to generate the Ni concentrations observed in the field. Weathering cell tests (small-scale humidity cell tests) were performed on fresh and weathered (produced 25 years ago) waste rock samples from the Tio mine containing various levels of hemo-ilmenite ore, and results were compared to humidity cell results on similar samples. The main constituents of the waste rock are the hemo-ilmenite ore and the plagioclase gangue; these minerals were purified from the waste rocks and the purified fractions were also submitted to weathering cell tests. The fresh waste rock samples were also submitted to sorption cells (modified weathering cells), which showed that the waste rocks have an important Ni sorption potential and that the sorbed phases are stable under weathering cell conditions. Even though the Ni concentrations obtained from the laboratory tests remain significantly lower than those obtained in field conditions (from field test pads and from waste rock piles), the results from the present study give important insight into the geochemical processes implicated in CND generation.

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Dissolution study of potassium feldspars using hydrothermally treated sanidine as an example

Adriaens

Goossens

Pijpers

et al. 1999

Surf. Interface Anal.

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Chapter 7. FELDSPAR DISSOLUTION KINETICS

Cited by 210 publications

References 0 publications

Predicting Geochemical Behaviour of Waste Rock with Low Acid Generating Potential Using Laboratory Kinetic Tests

Predicting Geochemical Behaviour of Waste Rock with Low Acid Generating Potential Using Laboratory Kinetic Tests

Kinetic Testing and Sorption Studies by Modified Weathering Cells to Characterize the Potential to Generate Contaminated Neutral Drainage

Dissolution study of potassium feldspars using hydrothermally treated sanidine as an example

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