Changes in Interlayer Potassium Exchangeability Induced by Heating Micas.

Scott, Alex; Ismail, F; Locatis, R.R.

doi:10.2172/4627325

Cited by 15 publications

(27 citation statements)

References 12 publications

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“…Indeed, the vermiculitization of micas, which was of considerable interest to researchers during the period 1960-1975, cannot be fully understood because of a lack of knowledge concerning the specific interactions at the molecular level between K cations and the structure (Norrish, 1972;Robert and Prdro, 1972;Rousseau et aL, 1972;Scott et aL, 1972;Kodama and Ross, 1972). For the same reasons, the mechanism of K fixation by K-montmorillonite subjected to wetting and drying cycles or by illitization are not completely understood to this day (Eberl et aL, 1986;Inou6 et aL, 1988).…”

Section: Introductionmentioning

confidence: 99%

Assignment of the Far-Infrared Absorption Bands of K in Micas

Laperche

1991

Clays and clay miner.

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Abstract--To identify the far-infrared (FIR) absorption bands related to K cations in micas, spectra of muscovite, phlogopite, and biotite were compared with the spectra of pyrophyllite and talc, which have no compensating cations, and to the spectra of micas in which K is substituted by mono-and divalent cations. Dichroic experiments using single crystals of these micas showed that some of the bands or components related to K have a strong in-plane and out-of-plane dichroic character. These experimental data led to the assignment of the FIR bands at 110, 91, and 83 cm -~ for muscovite, phlogopite, and biotite, respectively, which have no in-plane and out-of-plane dichroic character, to the vibration of the double ring of oxygen atoms that constitutes the cage in which K is located (mode III).Bands at 146, t36, and 152 cm -I for muscovite, phlogopite, and biotite, respectively, which have a strong out-of-plane dichroic character, were assigned to the out-of-plane vibrations of K atoms (mode IV). Some of the components at 190, 158-153, and 145-124 cm l for muscovite, phlogopite, and biotite, respectively, which have a strong in-plane dichroic character, are possibly related to the in-plane vibrations of K atoms (modes I and II). The 165-cm ~ band of muscovite is a lattice mode of vibration. Frequencies of modes III and IV of the compensating cations of micas in which K was substituted by mono-and divalent cations exchanged as a function of ~ where Z is the charge and m the mass of the cation. Modes III and IV were well resolved and very sensitive to the crystallochemical properties of the structure (di-or trioctahedral character, Fe content, etc.). FIR spectroscopy may therefore be an important tool that uses compensating cations as probes to study the interactions between the cations and the structure of mica minerals.

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Section: Introductionmentioning

confidence: 99%

Assignment of the Far-Infrared Absorption Bands of K in Micas

Laperche

1991

Clays and clay miner.

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“…This process lowers the K § activity in the suspending liquid by the precipitation of potassium tetraphenyl boron. Muscovite mica was heated to 5500C prior to the NaTPB treatment to enhance the K-depletion process (Scott et aL, 1972). Heating muscovite at 550~ should not affect its isotope exchange properties because this temperature is well below its dehydroxylation temperature (Jackson, 1956).…”

Section: K-depletion Of Micasmentioning

confidence: 99%

Oxygen Isotope Changes During Mica Alteration

Komarneni

Jackson

Cole

1985

Clays and clay miner.

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Abstract--Oxygen isotope analyses (bOtg) of micas that were artificially depleted in K* indicate little or no isotope exchange during the transformation. The oxidation of iron in K-depleted, iron-rich micas by H202 treatment resulted in 1.6 to 4.6~ decrease in ~O ~8 due to the fact that the equilibrium fracfionation factor is less than the initial difference between the starting 50 ~s of the fluid and micas. The oxygen isotope ratio ofa saponite formed by the weathering ofphlogopite showed a 9.7~ increase in bO ta due to authigenic recrystallization. These results suggest that oxygen isotope ratios can be used to determine the nature of chemical transformation during the weathering of mica to vermiculite and/or smectite.

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“…Scott et al (1972) have noted that changes in basal spacing and structural rearrangements from dehydroxylation of dioctahedral micas may be involved in the changes in K release rate induced by heating ground mica samples. Berger (1965) found no appreciable destruction of mineral structure occurred in Marblehead and Fithian illite at temperatures below approx.…”

Section: Chemical Propertiesmentioning

confidence: 99%

“…Both Robert (1971) and Scott et al (1972) have found the rate of K release can be reduced by the oxidation of iron in heated trioctahedral micas. Thus, the decrease in K release rate observed with heated glauconite could be anticipated and attributed to its high ferrous iron content (67 m-moles/100 g).…”

Section: Chemical Propertiesmentioning

confidence: 99%

“…In a comparison of several coarse-grained mica samples, however, Scott et al (1972) concluded it was mainly the rate of K exchange that was altered by heat treatments. With specific heat treatments, the extraction period for nealy all the K in < 50 ~rn muscovite particles was reduced from 2 yr to 1 week, whereas the period for 65 per cent K release in < 50 #m lepidomelane particles was increased from a few days to 2 yr. On the other hand, heat treatments induced little change in the exchangeability of K in phlogopite and altered both the rate and degree of K exchange in a synthetic fluorphlogopite.…”

Section: Introductionmentioning

confidence: 99%

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Exchangeability of Potassium in Heated Fine-Grained Micaceous Minerals

Smith

1974

Clays and Clay Minerals

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Abstract--Samples of several naturally fine-grained micaceous minerals were heated at 450~ for 24 hr (after the effects of other temperatures and heating periods were evaluated with the < 2 #m fraction of Grundite) and then characterized in terms of their release of K to NaCI-NaTPB (sodium tetraphenylboron) solutions and other potentially related properties.This heat treatment produced a substantial increase in the amount of K that each mineral released when first placed in the NaC1-NaTPB solution (the greatest increase being 22 m-equiv K/100 g in Marblehead illite). Depending upon the mineral heated, the subsequent rate of K release was increased, decreased or unchanged. Also, all the minerals except glauconite exhibited an increase (ranging from 4 to 38 m-equiv K/100 g) in their maximum degree of K release if they were heated. Thus, it was established that the K release behavior of these minerals is not only subject to appreciable alteration by heat treatments but is altered in a manner that varies with the mineral. The nature of these alterations, however, did not clearly identify an involvement of the other mineral properties that were examined. An increase in NH4-and Cs-exchangeable K occurred when these minerals were heated--presumably as a result of exfoliation. With Morris illite samples, this increase was nearly 28 m-equiv 100 g. Thus, heated samples of these minerals may be useful sinks for the removal of NH4 and Cs in various wastes.

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Changes in Interlayer Potassium Exchangeability Induced by Heating Micas.

Cited by 15 publications

References 12 publications

Assignment of the Far-Infrared Absorption Bands of K in Micas

Assignment of the Far-Infrared Absorption Bands of K in Micas

Oxygen Isotope Changes During Mica Alteration

Exchangeability of Potassium in Heated Fine-Grained Micaceous Minerals

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