Thermal analysis and FT-IR spectroscopy of synthetic clay mineral mixtures

Plevová, Eva; Vaculíková, Lenka; Valovičová, V.

doi:10.1007/s10973-020-09527-9

Cited by 12 publications

(3 citation statements)

References 37 publications

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“…Two small vibrations in the Q 3 zone might also be associated with the feldspars presence. A narrow signal at −107.3 ppm (Q 4 ) was generated by quartz and/or reactive silica [41][42][43][44][45][46]. The 29 Si NMR spectrum for siliceous waste HsT (Figure 7) had two wide bands characteristic of Q 2 and Q 3 units denoting the presence of silicates, perhaps in the form of C-S-H gels and/or feldspars, the latter at a higher percentage than in calcareous HcG.…”

Section: Hstmentioning

confidence: 99%

Multi-Technique Characterization of a Fine Fraction of CDW and Assessment of Reactivity in a CDW/Lime System

et al. 2020

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This study analysed the fine particle (<5 mm) waste generated during siliceous or calcareous (depending on the composition of the original aggregate) concrete waste crushing. In the absence of industrial applications, such waste is amassed in open-air stockpiles on construction and demolition wastes (CDW) management plant grounds. The aim pursued was to find an outlet for that material in the cement industry. The starting waste, sourced from six Spanish management facilities, was characterised for its chemical and mineralogical composition, physical properties and pozzolanicity. The mineralogical phases in the CDW/lime system and their variations during the pozzolanic reaction were likewise identified. The findings showed that the fine waste consisted primarily in quartz, calcite, micas and feldspars, with smaller fractions of kaolinite and cement anhydrous phases. No portland cement hydration phases were identified. All six types analysed exhibited medium to low pozzolanicity, with the highest values recorded for the siliceous waste. Ettringite, C–S–H gels and calcium aluminate hydrates (C4AH13, C4AcH12) were identified during the pozzolanic reaction in CDW/lime system. Therefore, this type of waste can be reused as supplementary cementitious material with low-medium pozzolanic activity.

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Section: Hstmentioning

confidence: 99%

Multi-Technique Characterization of a Fine Fraction of CDW and Assessment of Reactivity in a CDW/Lime System

et al. 2020

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“…The presence of kaolinite detected by X-ray and FT-IR analyses in the BEI, NAU and HEC samples was not confirmed by the thermal analysis due to the small amount of kaolinite in the sample. Also, kaolinite dehydroxylates are in the same interval as smectite minerals and therefore are not detectable on DTA curve in mixtures with a small quantity [55]. The temperatures of endotherm and exotherm peaks obtained from DTA curves are summarized in Table 3.…”

Section: Thermal Analysis and Transformation Of Smectites And Pt/smec...mentioning

confidence: 99%

Thermal Behavior of Ceramic Bodies Based on Fly Ash and Smectites

Plevová,

Vaculíková

2024

Minerals

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Clay minerals have a great influence on the resulting properties of ceramic bodies. Fly ash as a waste material from burning black coal in power plants is a potentially valuable source of oxides (Al2O3, SiO2 or Fe2O3) for this production. Considering the process of ceramic firing, it is important to understand the thermal behavior of individual ingredients. The thermal behavior of natural smectite minerals (montmorillonite, beidellite, hectorite and nontronite) and their mixtures with added fly ash at different ratios (10%, 30% and 50%) was investigated. The phase analysis was obtained using X-ray diffraction and FT-IR spectroscopy. Under heating to 1200 °C, the structural changes of smectites were divided into four steps including dehydration, dehydroxylation, decomposition and crystallization of new phases. The addition of fly ash caused a shift in the reaction temperatures for all the mentioned phases. These changes were most noticeable for mixtures with hectorite; on the contrary, they were least noticeable for beidellite mixtures. Total mixture mass loss continually decreased with increasing fly ash amount. The obtained experimental thermal data can be applicable not only in the production of ceramic bodies or energy waste processing but also in construction and ensuring the safety of municipal waste landfills.

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“…Above 1100 °C, samples showed expansion from 0.07 (CR12) to 0.72% (CR11) with peaks at around 1105 (CR12) and 1125 °C (CR3), due to the crystallization of cristobalite [28,36,37]. The dilatation at high temperatures can also be inuenced by the content of uxes, especially alkali oxides [38].…”

Section: Dilatometrymentioning

confidence: 99%

Raw kaolinitic–illitic clays as high-mechanical-performance hydraulically pressed refractories

Vasić

Radovanović

Pezo

et al. 2022

J Therm Anal Calorim

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The usage possibility of 19 composites of raw refractory clays from Serbia containing approximately 53.29% of SiO 2 and 26.73% of Al 2 O 3 is presented. The sum of uxing oxides was 57.74%, while these materials contained 32% of quartz, 29% of kaolinite and 26% of illite-mica. Dilatometry tests revealed a sudden shrinkage with the peak at approximately 1115 °C, owing to the formation of mullite. The refractoriness was in the range of 1581-1718 °C, which classies the composites from low-to high-duty refractories. Based on correlation analysis, the refractoriness mostly depended on the content of alumina. The lightness of the red test pieces was lower after ring when compared to the dry samples, and it decreased with the ring temperature from reddish to grayish. The study presents a novel attempt to dene all the necessary properties of raw refractory clays and products red at the 1100-1300 °C range on a laboratory level. Most of these clays can be used as natural refractory materials for ceramic and glass furnace lining. The organic matter in some of the samples inuences negatively the fast-ring process.

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Thermal analysis and FT-IR spectroscopy of synthetic clay mineral mixtures

Cited by 12 publications

References 37 publications

Multi-Technique Characterization of a Fine Fraction of CDW and Assessment of Reactivity in a CDW/Lime System

Multi-Technique Characterization of a Fine Fraction of CDW and Assessment of Reactivity in a CDW/Lime System

Thermal Behavior of Ceramic Bodies Based on Fly Ash and Smectites

Raw kaolinitic–illitic clays as high-mechanical-performance hydraulically pressed refractories

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