Trace elements in high-S subbituminous coals from the teruel Mining District, northeast Spain

Querol, Xavier; Fernández-Turiel, J. L.; Soler, Ángel López; Duran, M.E.

doi:10.1016/0883-2927(92)90070-j

Cited by 41 publications

(15 citation statements)

References 10 publications

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“…Concentrations of V (269 ppm) are high compared to typical world coals and concentrations of Cr (28 ppm) are relatively high compared to the other western Venezuela coals. The V may be hosted in kaolinite (e.g., Karayigit et al, 2000), which constitutes~55 wt.% of the ash; the Cr concentration is not atypical of world coals and may also be associated with kaolinite (e.g., Querol et al, 1992), or with organic matter (e.g., Huggins et al, 2000).…”

Section: Trace Element Chemistrymentioning

confidence: 99%

Petrology, mineralogy and geochemistry of mined coals, western Venezuela

Hackley

Warwick

González³

2005

International Journal of Coal Geology

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Section: Trace Element Chemistrymentioning

confidence: 99%

Petrology, mineralogy and geochemistry of mined coals, western Venezuela

Hackley

Warwick

González³

2005

International Journal of Coal Geology

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“…The emission of HTEs from coal combustion is one of the main sources of anthropogenic discharge and pollution. 1,2 Negative effects of HTEs on the environment and public health are well documented in the literature and have received much attention throughout the world. [3][4][5] China is one of the few countries with coal comprising more than 75% of its total energy consumption.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Assessment of Variability and Uncertainty of Hazardous Trace Element (Cd, Cr, and Pb) Contents in Chinese Coals by Using Bootstrap Simulation

Tian

Cheng

Wang

et al. 2011

Journal of the Air & Waste Management Association

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The quantitative measurements of uncertainties regarding the contents of hazardous trace elements (HTEs) serve as a basis for better assessment of the geochemistry and mineralogical characteristics of coals and their environmental impacts. In this paper, by using bootstrap simulation methodology, a quantitative procedure was demonstrated to characterize the variability and uncertainty of HTE (Cd, Cr, and Pb) contents in Chinese coals, which were specified by 27 different provinces and mining areas. Original data samples for Cd, Cr, and Pb contents in Chinese coals were compiled and summarized from the results reported in published literature. Sampling distributions for uncertainties in statistics such as the mean, median, and confidence interval were calculated. The national average contents were estimated at approximately 0.61 g/g for Cd, 30.37 g/g for Cr, and 23.04 g/g for Pb. The ranges of uncertainties for bootstrap samples of national HTE contents were nearly symmetrical, and the ranges of the 95% confidence interval for the arithmetic mean were relatively small, with relative uncertainties of Ϫ16.39% to ϩ21.31% for Cd, Ϫ10.11% to ϩ11.72% for Cr, and Ϫ8.55% to ϩ8.64% for Pb.

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“…Two different procedures for complete dissolution of the samples were compared in this 86 study: i) method 1 involves acid digestion in closed Teflon vessels (Querol et al, 1992) 87 whereas ii) method 2 involves alkaline fusion with Na 2 CO 3 which was optimized in this study 88 on the basis of previous experiments (Smith et al, 1991;Hofstetter et al, 1991). Method 1 is 89 a two-step digestion procedure which consists of the wet oxidation of the organic matter using 90 alkaline fusion, the organic matter is eliminated by ashing at 500 ºC.…”

Section: Boron Analysis 85mentioning

confidence: 99%

Study of boron behaviour in two spanish coal combustion power plants

Ochoa-González

Cuesta

Córdoba

et al. 2011

Journal of Environmental Management

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16A full-scale field study was carried out at two Spanish coal-fired power plants equipped with 17 electrostatic precipitator (ESP) and wet flue gas desulfurization (FGD) systems to investigate 18 the distribution of boron in coals, solid by-products, wastewater streams and flue gases. The 19 results were obtained from the simultaneous sampling of solid, liquid and gaseous streams 20and their subsequent analysis in two different laboratories for purposes of comparison. 21Although the final aim of this study was to evaluate the partitioning of boron in a 22 (co-)combustion power plant, special attention was paid to the analytical procedure for boron 23 determination. A sample preparation procedure was optimised for coal and combustion by-24 products to overcome some specific shortcomings of the currently used acid digestion 25 methods. In addition boron mass balances and removal efficiencies in ESP and FGD devices 26 were calculated. Mass balance closures between 83 and 149 % were obtained. During coal 27 combustion, 95 % of the incoming boron was collected in the fly ashes. The use of petroleum 28 coke as co-combustible produced a decrease in the removal efficiency of the ESP (87 %). 29Nevertheless, more than 90 % of the remaining gaseous boron was eliminated via the FGD in 30 the wastewater discharged from the scrubber, thereby causing environmental problems. 31 32

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Trace elements in high-S subbituminous coals from the teruel Mining District, northeast Spain

Cited by 41 publications

References 10 publications

Petrology, mineralogy and geochemistry of mined coals, western Venezuela

Petrology, mineralogy and geochemistry of mined coals, western Venezuela

Quantitative Assessment of Variability and Uncertainty of Hazardous Trace Element (Cd, Cr, and Pb) Contents in Chinese Coals by Using Bootstrap Simulation

Study of boron behaviour in two spanish coal combustion power plants

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