Distribution of inorganic and organic substances in the hydrocyclone separated Slovak sub-bituminous coal

Zubrik, Anton; Hredzák, Slavomír; Turcaniova, L.; Lovás, Michal; Bergmann, Ingo; Becker, K. D.; Lukčová, Mária; Šepelák, V.

doi:10.1016/j.fuel.2010.03.010

Cited by 26 publications

(7 citation statements)

References 29 publications

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“…Before the separation process of Falcon concentrator, the tailings were pre-concentrated by a two-stage hydrocyclone. Actually, a water-only cyclone has been applied in the beneficiation of low rank Slovak sub-bituminous coal from the Handlova deposit [50]. Falcon separation shows a better separation performance than MGS since Falcon concentrator as an enhanced-gravity separator.…”

Section: Gravity Separationmentioning

confidence: 99%

Recent advances in beneficiation for low rank coals

2015

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Section: Gravity Separationmentioning

confidence: 99%

Recent advances in beneficiation for low rank coals

2015

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“…Acid mine drainage interacts with coal because of its complex composition 11 . In addition, because coal contains several minerals 12 , its physical and chemical properties change significantly after long immersion in water [13][14][15] . Dissolution of organic and inorganic components cause structural damage of the coal and enhances the dissolved ion content of the water 15 .…”

Section: Introductionmentioning

confidence: 99%

“…In addition, because coal contains several minerals 12 , its physical and chemical properties change significantly after long immersion in water [13][14][15] . Dissolution of organic and inorganic components cause structural damage of the coal and enhances the dissolved ion content of the water 15 . The interaction between immersed coal and water accelerates its chemical damage16, which is manifested by increasing or decreasing oxygen-containing functional groups, such as the carboxy l and hydroxyl 17,18 .…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Pores in Coals Samples Exposedto Acid Mine Drainage

Tang

Luo

Zheng

et al. 2021

Preprint

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Acid mine drainage commonly occupies some pore space after underground coal mining, and this severely depreciates coal pillars, thereby posing a significant risk to mine stability. Considering that such depreciation is reflected in the microstructures of these pillars, in the present study, we propose a static immersion method suitable for coal seam samples immersion in the laboratory. We immersed the No. 2-2 coal seam samples from the Ningtiao Tower Coal Mine in Yulin, Shaanxi Province, in different acid mine drainage solutions and monitored the pH, oxidation–reduction potential (ORP), electrical conductivity (EC), total dissolved solids (TDS) among other water quality parameters for 300 h. After the immersion tests, samples were examined using scanning electron microscopy (SEM). The pH, ORP, EC, and TDS of the prepared acid mine drainage solutions increased significantly as the immersion time increased. Changes in water quality parameters are attributed to the absorption of hydrogen ions by insoluble clay minerals in the coal, which reduced the acidity, increased the pH value, and enhanced the electrical conductivity of the acid mine drainage solutions. SEM analysis reveals differences in the pore characteristics of (pore throat size and orientation) of the coal samples, and these are caused by erosive effects of the acid mine drainage solutions. Pores with throat sizes greater than 10 µm increased by 95% as the pH of the acid mine drainage solutions decreased, while the dominant pore orientation (60–90°) decreased to the 0–30° or increased to the 150–180° range, thereby increasing their randomness.

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“…Con objeto de profundizar en el conocimiento de la constitución de estas dos fracciones que experimentaban una mayor pérdida de peso, es decir, [I] y [C], se realizaron análisis de infrarrojo con transformada de Fourier, tal y como se muestra en las Figuras 5.26 y 5.27. En el caso de la muestra de influente [I], se observa un pico importante de descenso en el porcentaje de transmitancia, o de incremento de la absorción, sobre los 1020 cm -1 , seguramente causado por los minerales arcillosos y el cuarzo (Zubrik et al, 2010), y que desaparece para la fracción de rechazo de gruesos [C]. Para esta última fracción, la base de datos del analizador dio un porcentaje de similitud del 89,48% con estearato de calcio, un componente nada tóxico y muy estable empleado como lubricante sólido en muchas aplicaciones farmacéuticas (Roblegg et al, 2011), para mejorar la estabilidad térmica del PVC (Dong et al, 2013), así como en la fabricación de cosméticos, jabones y suavizantes de ropa, de ahí su presencia en fangos de depuradora (Bayo et al, 2016b).…”

Section: Análisis Termogravimétrico Y De Ftir De Las Distintas Fracciunclassified

“…El bajo valor encontrado para el rechazo de finos [F] del 0,05% tendría que ver con la mayor pérdida de agua en el primer paso del proceso, que como hemos indicado es del 5,45%, que impediría la formación posterior de hidrógeno; según Este último valor es similar al aportado por otros autores en estudios similares. Así, Scott et al (2006) dan un porcentaje de cenizas del 37,1% para fango digerido y del 26,7% para fango no digerido, y Zubrik et al (2010) del 36,80% en alimentación de un hidrociclón. Por tanto, podemos decir que la fracción procedente del rechazo de finos…”

Section: Figura 527 Análisis Ftir Para La Fracción De Rechazo De Grunclassified

Tools for optimization in the efficiency of exploitation of urban waste: Application of techniques quimiometrics for depuration data hydrocyclone for the cleaning of anaerobic digestors

García¹

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The control of the processes and the operation of wastewater treatment plants (WWTP) are carried out to ensure compliance with the legislative requirements imposed by the European Union. Because a large number of variables are daily measured, a coherent and structured approach to such a system is required to understand its inherent behaviour and performance efficiency. For this purpose, the physicochemical parameters are widely used as a reliable evaluation procedure that allows us to check the quality of the tributary and effluent to the plant. However, due to the large amount of data available on a daily basis, the great variability of the processes that occur in the WWTP and seasonal variations, it is difficult to evaluate the overall performance with univariate simple statistical methods. In this sense, both principal component analysis (PCA) and hierarchical clusters analysis (HCA) are multivariate techniques that have been extensively applied to extract and structure information for different purposes. In this PhD, both statistical tools are applied to the dataset over a three-year period of an urban WWTP located in Cartagena (Southeast of Spain), an area with special characteristics related to the geochemical composition of the water and an important use of fertilizers. Four main factors were extracted in association with the nutrients, the ionic component, the organic load of the WWTP and the efficiency of the whole process. The analysis of hierarchical groupings (HCA) allowed us to distinguish between influent and effluent parameters, although a deeper analysis gave rise to a dendrogram with groupings similar to those obtained for the analysis of main components. Resumen -AbstractJoaquín López-Castellanos García IV On the other hand, the optimization of the exploitation efficiency of an urban WWTP requires a correct management of its sludge, maximizing the time of use of its anaerobic digesters, among other factors. In this sense, this PhD presents the use of the hydrocyclone technique in the sludge line, recovering the useful capacity of the anaerobic digester after years of continuous operation and as an alternative to emptying it for maintenance and cleaning. The coarse fraction recovered prior the use of the hydrocyclone plant was observed to contain still potentially biodegradable matter, which could be used as soil amendment, with low concentrations of heavy metals. The hydrocyclone system showed a separation capacity over time for all types of solids, with higher concentration factors for fixed solids than for total or volatile solids, always being higher in the warmer seasons. X-ray diffraction analysis showed the presence of quartz in the fines fraction, which indicated its possible use as a building material or ceramic. In addition, it was observed that the formation of struvite increased with the increase of phosphorus and magnesium in the different fractions, as well as a concentration in the levels of chromium in the whole process with respect to the influent to the hydrocyclone, although...

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Distribution of inorganic and organic substances in the hydrocyclone separated Slovak sub-bituminous coal

Cited by 26 publications

References 29 publications

Recent advances in beneficiation for low rank coals

Recent advances in beneficiation for low rank coals

Characteristics of Pores in Coals Samples Exposedto Acid Mine Drainage

Tools for optimization in the efficiency of exploitation of urban waste: Application of techniques quimiometrics for depuration data hydrocyclone for the cleaning of anaerobic digestors

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