Applications of DTA and DSC to coal and oil shale evaluation

Warne, S.St.J.; Dubrawski, J. V.

doi:10.1007/bf01914282

Cited by 24 publications

(7 citation statements)

References 89 publications

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“…However, this trend is not obvious for nahcolite. The influence of CO 2 on the Tp has been reported in the literature for several carbonates [15] but according to our knowledge no one has reported similar observations for dawsonite and nahcolite. Both dawsonite and nahcolite are members of the carbonate family.…”

Section: Resultssupporting

confidence: 61%

Thermal Behavior of Raw Oil Shale and Its Components

Palayangoda¹,

Nguyen²

2015

Oil Shale

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In this study, the thermal behavior of dawsonite, nahcolite, quartz, dolomite, albite, illite, analcime, kerogen and raw oil shale samples is discussed. Thermal Gravimetric Analysis (TGA), Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy (ATR-FTIR) and Differential Scanning Calorimetry (DSC) were used to study the thermal properties of the samples. The DSC dynamic experiments were performed in CO 2 and N 2 atmospheres. The influence of purge gases on the thermal decomposition of kerogen, dawsonite and nahcolite was investigated. In the DSC experiments, the heating rate did not change the decomposition mechanism of both dawsonite and nahcolite and the Tp (the sample temperature at which the maximum deflection in the DSC curve is recorded) of dawsonite and nahcolite could be moved to higher temperatures by purging CO 2 .

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Section: Resultssupporting

confidence: 61%

Thermal Behavior of Raw Oil Shale and Its Components

Palayangoda¹,

Nguyen²

2015

Oil Shale

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“…When applying this method to identify minerals in coal samples, a high concentration of clays (>50%) might inhibit the characterization of silica, carbonates, and sulfides. Under an inert atmosphere, DTA exhibits minor peaks, which allows for comparison with standard patterns to identify mineral matter [199][200][201]. Table 4 shows detection limits for DTA under an inert nitrogen (N 2 ) atmosphere as reported by Warne [202].…”

Section: Differential Thermal Analysis (Dta)mentioning

confidence: 99%

Review of Respirable Coal Mine Dust Characterization for Mass Concentration, Size Distribution and Chemical Composition

et al. 2021

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Respirable coal mine dust (RCMD) exposure is associated with black lung and silicosis diseases in underground miners. Although only RCMD mass and silica concentrations are regulated, it is possible that particle size, surface area, and other chemical constituents also contribute to its adverse health effects. This review summarizes measurement technologies for RCMD mass concentrations, morphology, size distributions, and chemical compositions, with examples from published efforts where these methods have been applied. Some state-of-the-art technologies presented in this paper have not been certified as intrinsically safe, and caution should be exerted for their use in explosive environments. RCMD mass concentrations are most often obtained by filter sampling followed by gravimetric analysis, but recent requirements for real-time monitoring by continuous personal dust monitors (CPDM) enable quicker exposure risk assessments. Emerging low-cost photometers provide an opportunity for a wider deployment of real-time exposure assessment. Particle size distributions can be determined by microscopy, cascade impactors, aerodynamic spectrometers, optical particle counters, and electrical mobility analyzers, each with unique advantages and limitations. Different filter media are required to collect integrated samples over working shifts for comprehensive chemical analysis. Teflon membrane filters are used for mass by gravimetry, elements by energy dispersive X-ray, rare-earth elements by inductively coupled plasma-mass spectrometry and mineralogy by X-ray diffraction. Quartz fiber filters are analyzed for organic, elemental, and brown carbon by thermal/optical methods and non-polar organics by thermal desorption-gas chromatography-mass spectrometry. Polycarbonate-membrane filters are analyzed for morphology and elements by scanning electron microscopy (SEM) with energy dispersive X-ray, and quartz content by Fourier-transform infrared spectroscopy and Raman spectroscopy.

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“…The thermal methods, including TG, DSC and DTA techniques, are implemented in evaluation of fossil fuels: lignites [1], coal [2,3] and oil shales [4][5][6], etc. Rajeshwar [7,8] stated the applicability of DSC method to measurement of oil shale combustion enthalpies.…”

Section: Introductionmentioning

confidence: 99%

Thermal methods implementation in analysis of fine-grained rocks containing organic matter

Labus

2017

J Therm Anal Calorim

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The thermal methods, including TG and DSC techniques, were implemented to determine the composition of the fine-grained rocks with dispersed organic matter. The analyses were carried out in inert and oxidising atmosphere. The analysed samples represented Palaeozoic siltstones, shales, claystones and mudstones from Baltic Basin, Lublin Basin and Upper Silesian Coal Basin (Poland). There was detected the presence of some minerals as: clay minerals, muscovite, quartz, calcite, dolomite and pyrite. A comparison of the reactions occurring in an oxidising and inert atmosphere can give a solution to the problem of some effects overlapping, such as distinguishing pyrite decomposition from organic matter combustion. The analysis of DSC curves of heated rocks under oxidative atmosphere allows to determine the temperature regions of the organic matter combustion and to conclude on its maturity level. There was also found a strong correlation between the mass loss resulted from organic matter combustion, and the mass loss as a result of pyrolysis.

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Applications of DTA and DSC to coal and oil shale evaluation

Cited by 24 publications

References 89 publications

Thermal Behavior of Raw Oil Shale and Its Components

Thermal Behavior of Raw Oil Shale and Its Components

Review of Respirable Coal Mine Dust Characterization for Mass Concentration, Size Distribution and Chemical Composition

Thermal methods implementation in analysis of fine-grained rocks containing organic matter

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