FT-IR spectroscopy and TG/DTA as a tool of characterization of clay mineral mixtures

Kód výsledku v IS VaVaI

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Výsledek na webu

<a href="https://www.dttg.ethz.ch/Abstract%20book%20mecc20.pdf" target="_blank" >https://www.dttg.ethz.ch/Abstract%20book%20mecc20.pdf</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

FT-IR spectroscopy and TG/DTA as a tool of characterization of clay mineral mixtures

Popis výsledku v původním jazyce

Clay minerals belong among the most widespread minerals in the earth's crust rock system. Clays, and in particular mixed layered or interstratified clay minerals, are generally mixtures of predominantly clay mineral together with a minor amount of other clay minerals, wherein the ratio of the components determines the final properties of these materials. The widely common method used for the qualitative and quantitative phase analysis is X-ray powder diffraction. Whereas the mineral identification is quite simple and unambiguous, accurate quantitative analysis, especially for clay minerals, is still rather complicated due to varying chemical composition and frequent structural defects together with very small particle size. Therefore, the aim of this study is focuses on FT-IR spectroscopy and thermal analysis and their contribution to the identification of clay minerals in clay mixtures. From the results of both methods is evident, that kaolinite is the most reliable detectable mineral. FT-IR spectroscopy allows detection of 1 wt.% of kaolinite in admixture with chlorite, while thermal analysis allows detection of 3 wt.% of kaolinite in admixture. In case of montmorillonite and chlorite, the identification by FT-IR spectroscopy shows detection limit only 30 wt.% in contrast to TG/DTA with the detection limit of 5 wt.% for montmorillonite and 5 wt.% or 10 wt.% for chlorite. The differences in detection limits for all tested minerals are attributed to both more or less overlapping absorption bands in the infrared spectra for clay minerals and overlapping thermal effects of clay minerals or thermal effects related to accessory minerals (calcite, quartz etc.) in DTA curves. The obtained results can be effectively used to solve problems in identification of clay minerals in sedimentary rocks, which is very important for subsequent applications in geological, geochemical and geomechanical mining activities.

Název v anglickém jazyce

FT-IR spectroscopy and TG/DTA as a tool of characterization of clay mineral mixtures

Popis výsledku anglicky

Clay minerals belong among the most widespread minerals in the earth's crust rock system. Clays, and in particular mixed layered or interstratified clay minerals, are generally mixtures of predominantly clay mineral together with a minor amount of other clay minerals, wherein the ratio of the components determines the final properties of these materials. The widely common method used for the qualitative and quantitative phase analysis is X-ray powder diffraction. Whereas the mineral identification is quite simple and unambiguous, accurate quantitative analysis, especially for clay minerals, is still rather complicated due to varying chemical composition and frequent structural defects together with very small particle size. Therefore, the aim of this study is focuses on FT-IR spectroscopy and thermal analysis and their contribution to the identification of clay minerals in clay mixtures. From the results of both methods is evident, that kaolinite is the most reliable detectable mineral. FT-IR spectroscopy allows detection of 1 wt.% of kaolinite in admixture with chlorite, while thermal analysis allows detection of 3 wt.% of kaolinite in admixture. In case of montmorillonite and chlorite, the identification by FT-IR spectroscopy shows detection limit only 30 wt.% in contrast to TG/DTA with the detection limit of 5 wt.% for montmorillonite and 5 wt.% or 10 wt.% for chlorite. The differences in detection limits for all tested minerals are attributed to both more or less overlapping absorption bands in the infrared spectra for clay minerals and overlapping thermal effects of clay minerals or thermal effects related to accessory minerals (calcite, quartz etc.) in DTA curves. The obtained results can be effectively used to solve problems in identification of clay minerals in sedimentary rocks, which is very important for subsequent applications in geological, geochemical and geomechanical mining activities.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

10406 - Analytical chemistry

Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů