Inorganic Sulfur in Coal

Gluskoter, H.J.

doi:10.1080/00908317708945974

Cited by 39 publications

(32 citation statements)

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“…Other inorganic forms of sulfur such as gypsum are relatively low in abundance (<0.5 wt %) or rapidly appear as weathering products from the pyrite (17). There is little exact knowledge of the forms in which sulfur exists in organic combination.…”

Section: Resultsmentioning

confidence: 99%

Coal Microstructure and Pyrite Distribution

Greer

1977

Coal Desulfurization

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The microstructure of coal is of interest in understanding coal properties. Microstructural features may affect the selection of coal beneficiation methods for removing impurities. For example, in planning sulfur removal schemes it is useful to understand the proportionment of inorganic sulfur compared with that of organic sulfur. Details of size, shape, orientation, and distribution factors for pyrite, certain pyrite and maceral groupings or fields, or other coal constituents (macerals and other inorganic components) are of importance in supporting rational designs of sulfur removal processes. Recent scanning electron microscope (SEM) investigations help to show the interrelations between macerals and inorganic phases such as pyrite (FeS 2 , the primary inorganic source of sulfur in coal) (1,2,3,4). This form of characterization complements optical microscope studies (5,6,7,8) and conventional transmission electron microscope (TEM) studies (9-15) which have been used to classify and to study coal constituents. SEM offers a way to visualize features hundreds and thousands of Angstroms in diameter by direct observation in three dimensions which is not available by any other technique. Many significant coal features (such as cellular components) and impurity crystals occur in this size range. Important features of coal constitution discovered by SEM are discussed below. Experimental InvestigationApparatus. A JSM-U3 SEM with an EDAX energy dispersive x-ray analysis system is used for the microscale structural and chemical studies.The resolution capabilities of the instrument on a dayto-day basis are somewhat better than 200 Â for microstructural information and submicrometer in a chemical analysis mode for localized crystal description. The system provides size, shape, orientation, and distribution information for inorganic phases and coal constituents.

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Section: Resultsmentioning

confidence: 99%

Coal Microstructure and Pyrite Distribution

Greer

1977

Coal Desulfurization

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“…1). Analysis of the products revealed that thiophene was converted to less environmentally harmful inorganic compounds such as SO 4 2 − and CO 2 [20].…”

Section: Oxidation Of Sulfur Compoundsmentioning

confidence: 99%

“…Ferric ions could be produced via pyrite electrooxidation or iron electrooxidation, which then reacted with mercaptans to form disulfides through Eq. (3) [4],…”

Section: Mediatorsmentioning

confidence: 99%

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A review of electrochemical desulfurization technologies for fossil fuels

Lam

Song

et al. 2012

Fuel Processing Technology

105

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Desulfurization is an important process for crude oil upgrading. Electrochemical desulfurization technologies have advantages over conventional hydrodesulfurization technologies in terms of low temperature and pressure operation with high product selectivity and therefore less energy consumption. In this paper the authors reviewed the research done in the past decades on electrochemical desulfurization for fossil fuels. The principles, electrochemical methods, electrochemical reactors, catalysts and electrolytes employed in the electrochemical desulfurization process were discussed; and future research work is recommended.Crown

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“…It occurs mainly in the form of iron and calcium sulfates (Gluskoter 1977). In British and US coal the quantity of sulfate sulfur rarely exceeds 0.3% (Wandless 1955;Bhatia 1978;Casagrande 1987).…”

Section: Sulfur Compounds In Coalmentioning

confidence: 99%

Distribution of sulfur in power supply lignite from North Hungary

László¹

2012

Central European Geology

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The present article discusses the results of measurements carried out to assess the distribution of different sulfur types in lignite samples deriving from two opencast lignite mines near the villages of Bükkábrány and Visonta. These mines ensure the continuous supply of fuel for one of Hungary's largest thermal power plant. According to our findings no significant differences could be identified between the samples of the two mines based on their total sulfur (S t ) content. Both lignite types were classified as coals with medium-sulfur content according to the system of Chou (1990). A majority of total sulfur is accumulated in lignite, while in the intercalated carbonaceous shale total sulfur is present in minor amounts. Usually the sequence of the distribution of sulfur among the different bond forms in lignite collected from opencast mine of Visonta is as follows: pyritic sulfur (S p ) > organic sulfur (S org ) > sulfate sulfur (S SO 4 ). In the samples collected from Visonta and Bükkábrány quantities of total sulfur were similar. However, some difference in their distribution among various sulfur types were noted. Although half of the samples were weathered and the amount of pyrite sulfur must have been higher in the weathered lignite of Bükkábrány preceding the oxidation process, the sequence of the distribution of sulfur was likely as follows S org > _ S p > S SO 4 .

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Inorganic Sulfur in Coal

Cited by 39 publications

References 1 publication

Coal Microstructure and Pyrite Distribution

Coal Microstructure and Pyrite Distribution

A review of electrochemical desulfurization technologies for fossil fuels

Distribution of sulfur in power supply lignite from North Hungary

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