The beneficiation of Martin Lake Texas lignite

Cronauer, Donald C.; Joseph, Joseph T.; Davis, A. W.; Quick, Jeffrey; Luckie, P.T.

doi:10.1016/0016-2361(92)90194-s

Cited by 15 publications

(4 citation statements)

References 7 publications

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“…The examined samples are mainly macerals of the huminite group, which are characterized by a higher oxygen content and lower carbon content compared to both inertinite and liptinite (Cronauer et al 1992). A relatively large number of aliphatic groups have been observed in the examined ortho-lignite samples.…”

Section: The Characteristics Of the Examined Coalmentioning

confidence: 98%

The suitability of Polish lignite for gasification

Bielowicz

2019

Clean Techn Environ Policy

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The article discusses the impact of the lithotype of lignite on the suitability for gasification in CO 2 atmosphere. The research was aimed at determining the influence of lithotype, petrographic composition, and physical and chemical properties of coal on the composition and release of syngas. The examined coals were humic coals. The first step was to determine the impact of lithotype on the degree of carbon conversion at a temperature of up to 815 °C. The gasification process was conducted in the temperature range of 600-1100 °C. During the experiment, two gas samples, used for determining the chemical content of gas, were collected at 950 and 1050 °C, respectively. What is more, continuous monitoring of the gas density during the gasification was carried out. Depending on the lithotype, the content of ash, moisture, and the degree of coalification, the intensity of gas release is different for different temperatures. In addition, it has been found that coals with a high content of poorly gelified xylite and a low ash content are the fastest reacting and the most responsive. The importance of this research lies in determining that the gasification of coal with a low degree of coalification requires technologies carried out at reactor temperatures above 1000 °C.

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Section: The Characteristics Of the Examined Coalmentioning

confidence: 98%

The suitability of Polish lignite for gasification

Bielowicz

2019

Clean Techn Environ Policy

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“…Although, many works on biomass combustion with TG [11][12][13][14][15] and coal combustion [16][17][18][19][20][21][22][23] are available in the literature, investigations on 'enriched coal' are rather less [24][25][26]. The enrichment of coal provides an opportunity for the separation of coals and their maceral composition due to the difference of densities [27].…”

Section: Journal Of Combustionmentioning

confidence: 99%

Investigation of the Thermal Improvement and the Kinetic Analysis of the Enriched Coal

Duzyol

Şensöğüt

2018

Journal of Combustion

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The present research work is comprised of three main parts. The first part is about the enrichment of lignite coal by the utilization of dense medium separation called float and sink method. The second part deals with the investigation of the thermal behaviour for the coals enriched while the last part is concerned with the kinetic analysis of the coal combustion. The float and sink method is the mostly used technique for low-rank coal beneficiation in coal preparation plants of Turkey. In order to realize this process, the coal samples were, at first, fractioned to five different sizes which were -32+25 mm, -25+16 mm, -16+8 mm, -8+4.75 mm, and -4.75+2 mm. Each fraction was, then, processed in the dense mediums with the specific gravities of 1.20, 1.30, 1.40, 1.50, and 1.60 g/cm3, respectively. The thermal behaviour of the floated materials from the float and sink process was investigated in detail with the thermogravimetric analysis (TG) and the differential thermogravimetric analysis (DTG). The ignition and peak temperatures for the samples were also ascertained and correlated with the float and sink test results. In the final part of the study, the kinetic analysis of the coal samples was carried out by the Coats–Redfern method and the activation energies of the enriched coals were determined. The activation energies of the raw and the enriched coals were assessed and compared. The calculated activation energy values for the combustion reactions of the coal samples ranged were found to be between 15.17 kJ/mol and 97.45 kJ/mol. The strong correlation was obtained between the float and sink test results especially with the ash content of the coal samples and the combustible characteristic of the floated materials such as ignition temperatures, peak temperatures, and activation energies. The combustion characteristics of the coal samples were resultantly ascertained to be very dependent on the coal structure.

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“…6 However, the compositions and therefore technological properties of individual macerals differ even when the are from the same maceral group, as it was described in numerous investigations. 4,[6][7][8][9][10][11] Unlike maceral analysis, biomarker analysis is related to extractable OM (bitumen) and enables to identify numerous individual compounds with strong resemblance in structure of their parent organic molecules in living organisms. Also, biomarker assemblages provide important information about depositional environment of the OM.…”

Section: Introductionmentioning

confidence: 99%

Characterisation of lignite lithotypes from the “Kovin” deposit (Serbia) - implications from petrographic, biomarker and isotopic analysis

Mitrović¹,

Đoković²,

Životić³

et al. 2017

JSCS

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Four lignite lithotypes (matrix coal, xylite-rich coal, mixture of matrix and mineral-rich coal and mixture of matrix and xylite-rich coal), originating from the Kovin deposit, were investigated in detail. The paper was aimed to determine the main maceral, biomarker and isotopic (?13C) characteristics of investigated lithotypes. Based on these results the sources and depositional environment of organic matter in 4 lithotypes were established. These samples were also used as substrates for investigation of the influence of diagenetic alteration on ?13C signatures of biomarkers, as well as for assessment of the most convenient utilization for each lithotype. The investigated lithotypes differ in accordance with the composition of huminite macerals. Xylite-rich coal notably distinguishes from other lithotypes beacuse of the highest content of conifer resins vs. epicuticular waxes. The mixture of matrix and mineral-rich coal is characterised by the greatest contribution of algae and fungi and the most intense methanotrophic activity at the time of deposition. In all coal lithotypes diagenetic aromatisation influenced isotopic composition of individual biomarkers. Xylite-rich coal has the poorest grindability properties. However, this coal lithotype is the most suitable for fluidized bed gasification, whereas the mixture of matrix and mineral-rich coal has the lowest applicability for this process. The calorific value decreases in order: xylite-rich coal > matrix coal > mixture of matrix and xylite-rich coal > mixture of matrix and mineral-rich coal. The increase of organic carbon content and calorific value is controlled by the increase of contribution of wood vegetation vs. herbaceous peat-forming plants, as well as by stability of water table during peatification. [Project of the Ministry of Education, Science and Technological Development of the Republic of Serbia, Grant no. 176006 and Grant no. 451-03-01039/2015-09/05]

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The beneficiation of Martin Lake Texas lignite

Cited by 15 publications

References 7 publications

The suitability of Polish lignite for gasification

The suitability of Polish lignite for gasification

Investigation of the Thermal Improvement and the Kinetic Analysis of the Enriched Coal

Characterisation of lignite lithotypes from the “Kovin” deposit (Serbia) - implications from petrographic, biomarker and isotopic analysis

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