Analysis of fly ash by X-ray emission spectroscopy and proton microbeam analysis

Valković, V.; Makjanić, J.; Jakšić, Milko; Popović, Stanko; Bos, A.J.J.; Vis, R.D.; Wiederspahn, K. J.; Verheul, H.

doi:10.1016/0016-2361(84)90337-5

Cited by 26 publications

(10 citation statements)

References 9 publications

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“…According to average values of macro-structural characteristics of prototurbostrate, i.e. imperfectly built, laminated clusters, that were calculated by methods described in [6,7,20], solid asphaltites have particles formed by M = 4.4 layers of flat aromatic sheets. The average distance (d m ) between these sheets is 3.56 Å.…”

Section: Structural Features Of Asphaltites and Their Isolated Fractionsmentioning

confidence: 99%

High-Sulfurous Argentinian Asphaltites and Their Thermal Liquefaction Products

Савельев

Головко

Gorbunova

et al. 2008

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Asphaltites d'Argentine à forte teneur en soufre et les produits de leur liquéfaction thermique -Ce travail présente les résultats d'une étude approfondie de la nature chimique des asphaltites des gisements Rafaelita et Toribia (des provinces Mendoza et Neuquéen en Argentine) ainsi que des propositions pour le traitement de ces charges. La composition et les particularités structurales des composants maltènes, asphalténiques et hydrocarbonés plus légers de ces composés, proches du charbon, ont été étudiées. Des expériences en laboratoire sur la liquéfaction thermique des asphaltites ont été réalisées, incluant : 1) une pyrolyse à températures croissantes jusqu'à 600 °C ; 2) une conversion thermique en condition de température programmée allant de 25 jusqu'à 350 ou 450 °C en fixant une rampe de montée en température de 5°C par minute et avec récupération des produits de réaction dans un gazole de distillation directe ; 3) un traitement thermique des échantillons étudiés sous conditions stationnaires (à 350°C pendant une heure dans l'eau, la tétraline ou le n-décane) ; et finalement 4) une transformation thermique des échantillons d'asphaltites sous différentes atmosphères (injection en continu dans le réacteur d'eau ou de décane, la température variant de 25°C jusqu'à 500°C, avec prises d'essais à différents niveaux de température). Le rendement le plus élevé en produits de conversion a été obtenu lorsque la conversion thermique a été réalisée en milieu hydrocarboné à des températures pas plus faibles que 400-450°C, en prélevant en continu les produits formés pendant la réaction. Le rendement en hydrocarbures légers a atteint 25% poids de la quantité organique d'asphaltite initiale lorsque le n-décane a constitué le milieu réactionnel, et a pu croître jusqu'à 70% poids en substituant ce solvant par une coupe gazole. Abstract -High-Sulfurous Argentinian Asphaltites and Their Thermal Liquefaction Products -The results of profound chemical studies of asphaltites from the Rafaelita and Toribia fields (Mendosa and

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Section: Structural Features Of Asphaltites and Their Isolated Fractionsmentioning

confidence: 99%

High-Sulfurous Argentinian Asphaltites and Their Thermal Liquefaction Products

Савельев

Головко

Gorbunova

et al. 2008

Oil & Gas Science and Technology - Rev. IFP

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“…Dai et al (2013bDai et al ( , 2015 also discussed the enrichment of V-Cr-Mo-Se-Re-U in SHOS coals. Considering the ash, Valković et al (1984) Limić and Valković (1986) analysed two Raša coal regions, 400 m apart, where coal samples (n = 265) were collected simultaneously with the exploitation. Element ranges (all in mg/kg except for S, Ca and Fe in %) were as follows: S 6.00-9.00, Ca 2.90-9.00, Fe 0.…”

Section: Introductionmentioning

confidence: 99%

Geochemistry of Croatian superhigh-organic-sulphur Raša coal, imported low-S coal and bottom ash: their Se and trace metal fingerprints in seawater, clover, foliage and mushroom specimens

Medunić

Kuharić

Krivohlavek

et al. 2018

IJOGCT

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Abstract:The Labin City area has represented the major Croatian coal mining, metal industry and coal-fired electricity centre for more than two centuries. The domestic superhigh-organic-sulphur (SHOS) Raša coal is a unique variety compared to other coal types worldwide, based on its highest organic sulphur values, up to 11%. It was utilised in the Plomin coal-fired power plant during the period 1970-2000, and was replaced by an imported low-S coal afterwards. This paper presents the levels of S, Se, V, U, Hg, Sr, Cd, Cr, Pb, Cu and Zn in the two coal types, their bottom ash, seawater and plant (clover, mushroom and foliage) specimens collected from the Labin City area, while the sulphate was measured in surface stream water. Their levels were compared with relevant legislative as well as the published data from different world localities. Data analysis was interpreted in the context of past and recent coal combustion activities.

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“…In particular, Selenium and selected PTEs were found to be increased in soil, sediment, surface water, locally grown vegetables, and local birds [5,28]. A local CCW, located in a Štrmac village ( Figure 1, S4 and S8 locations), was found to have decreased Se values compared to relevant previous studies [29]. This indicates leaking problems, as the study area belongs to vulnerable karstic environment which promotes Se mobility due to high Eh/pH conditions [5].…”

Section: Introductionmentioning

confidence: 68%

Use of Bacteria and Synthetic Zeolites in Remediation of Soil and Water Polluted with Superhigh-Organic-Sulfur Raša Coal (Raša Bay, North Adriatic, Croatia)

Medunić

Singh

et al. 2019

Water

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The Raša Bay (North Adriatic, Croatia) has been receiving various pollutants by inflowing streams laden with untreated municipal and coalmine effluents for decades. The locality was a regional center of coalmining (Raša coal), coal combustion, and metal processing industries for more than two centuries. As local soil and stream water were found to be contaminated with sulfur and potentially toxic trace elements (PTEs) as a consequence of weathering of Raša coal and its waste, some clean-up measures are highly required. Therefore, the aim of this study was to test the remediating potential of selected microorganisms and synthetic zeolites in the case of soil and coal-mine water, respectively, for the first time. By employing bacterial cultures of Ralstonia sp., we examined removal of sulfur and selected PTEs (As, Ba, Co, Cr, Cu, Ni, Pb, Rb, Se, Sr, U, V, and Zn) from soil. The removal of sulfur was up to 60%, arsenic up to 80%, while Se, Ba, and V up to 60%, and U up to 20%. By applying synthetic zeolites on water from the Raša coalmine and a local stream, the significant removal values were found for Sr (up to 99.9%) and Ba (up to 99.2%) only. Removal values were quite irregular (insignificant) in the cases of Fe, Ni, Zn, and Se, which were up to 80%, 50%, 30%, and 20%, respectively. Although promising, the results call for further research on this topic.

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Analysis of fly ash by X-ray emission spectroscopy and proton microbeam analysis

Cited by 26 publications

References 9 publications

High-Sulfurous Argentinian Asphaltites and Their Thermal Liquefaction Products

High-Sulfurous Argentinian Asphaltites and Their Thermal Liquefaction Products

Geochemistry of Croatian superhigh-organic-sulphur Raša coal, imported low-S coal and bottom ash: their Se and trace metal fingerprints in seawater, clover, foliage and mushroom specimens

Use of Bacteria and Synthetic Zeolites in Remediation of Soil and Water Polluted with Superhigh-Organic-Sulfur Raša Coal (Raša Bay, North Adriatic, Croatia)

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