Interactions between organic matter and minerals in two bituminous coals of different rank

Pusz, S.; Krztoń, Andrzej; Komraus, J. L.; Martı́nez-Tarazona, M. Rosa; Martı́nez-Alonso, A.; Tascón, J.M.D.

doi:10.1016/s0166-5162(96)00052-3

Cited by 24 publications

(13 citation statements)

References 14 publications

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“…Pusz et al (1997) who studied the density fractions of coals using vitrinite reflectance, X-ray diffraction, FTIR and Mossbauer spectroscopy found that for low volatile coals carbonates and for highvolatile bituminous coals sulfides especially associated with organic matter. The most important impurity in coal is sulfur, which is present in the raw coal as organic, sulfatic or pyritic forms.…”

Section: Coalmentioning

confidence: 99%

Physical and chemical interactions in coal flotation

Polat

Chander

2003

International Journal of Mineral Processing

189

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Coal flotation is a complex process involving several phases (particles, oil droplets and air bubbles). These phases simultaneously interact with each other and with other species such as the molecules of a promoting reagent and dissolved ions in water. The physical and chemical interactions determine the outcome of the flotation process. Physical and chemical interactions between fine coal particles could lead to aggregation, especially for high rank coals. Non-selective particle aggregation could be said to be the main reason for the selectivity problems in coal flotation. It should be addressed by physical (conditioning) or chemical (promoters) pretreatment before or during flotation. Although the interactions between the oil droplets and coal particles are actually favored, stabilization of the oil droplets by small amounts of fine hydrophobic particles may lead to a decrease in selectivity and an increase in oil consumption. These problems could be remedied by use of promoters that modify the coal surface for suitable particle -particle, droplet -particle and particle -bubble contact while emulsifying the oil droplets. The role of promoters may be different for different types of coals, however. They could be employed as modifiers to increase the hydrophobicity of low rank coals whereas their main role might be emulsification and aggregation control for high rank coals. In this paper, a detailed description of the various phases in coal flotation, their physical and chemical interactions with each other in the flotation pulp, the major parameters that affect these interactions and how these interactions, in turn, influence the flotation process are discussed. D

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Section: Coalmentioning

confidence: 99%

Physical and chemical interactions in coal flotation

Polat

Chander

2003

International Journal of Mineral Processing

189

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“…There are numerous descriptions from different coal basins worldwide of the behavior of coals main-and trace elements during combustion (e.g., Swaine 1990;Querol et al 1995;Pusz et al 1997; Baruah et al 2003; Xu et al 2003;Ketris 2002, 2015;Lewińska-Preis et al 2009;Dai et al 2012Dai et al , 2014 2017; Kolker 2012; Hower et al 2016). Due to much higher mineral contents, the mobility of trace elements in coal waste might be expected to be signi cantly different from that in coal (Li et In this regulatory context, it is important to establish the composition of natural coal-waste leachates and whether any migration out of coal-waste dumps poses a hazard to the aquatic environment and groundwater.…”

Section: Coal Waste and Coal-waste Dump Watersmentioning

confidence: 99%

Selected ions and major- and trace elements as contaminants in coal-waste dump water from the Lower- and Upper Silesian Coal Basins (Poland)

Lewińska-Preis

Szram

Fabiańska

et al. 2020

Preprint

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Many temporary- and permanent reservoirs of water occur on or in the immediate vicinity of coal-waste dumps in the Lower- and Upper Silesian Coal Basins (Poland). Little or nothing is known of the degree to which their water chemistry might reflect (a) reservoir type, i.e., whether permanent or temporary, (b) level of coal-waste thermal activity, i.e., whether inactive or self-heating or burnt-out or (c) region, i.e., whether the dumps lay in the Upper- or Lower Silesian basins. To provide some answers, concentrations of selected ions (NH4+, HCO3−, F−, Cl−, Br−, NO2−, NO3−, PO43−,SO42−) were determined by ion chromatography and of nineteen elements (Al, B, Ba, Ca, Cd, Cr, Cu, Fe, K, Li, Mg, Mn, Na, P, Pb, S, Si, Sr, Zn) by inductively coupled plasma mass spectrometry (ICP-MS). The data allow a number of observations. In temporary reservoirs, concentrations of ions and of major- and trace elements are relatively much lower and any correlations between components less significant; reservoirs exist for too short a time to allow any balance between coal waste- and water components to be established. A clear relationship does exist between concentrations of ions and of major- and trace elements and dump thermal activity. The highest concentrations occur where thermal activity is high and inorganic components are mobilized. Finally, a regional pattern of elemental- and ion concentrations in the dump waters reflects important regional differences in thermal activity.

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“…The mineral matter can be responsible for up to 45% of the total volatile yield in coal, depending on the coal type, particle size, thermal process and amount and type of mineral matter present [11]. It has a profound effect on coal reactivity, and during catalysis of gasification reactions [12,13]. Mineral matter is also responsible for various technological problems such as fouling, slagging and inconsistency with regard to product yield and composition [13].…”

Section: Introductionmentioning

confidence: 99%

“…It has a profound effect on coal reactivity, and during catalysis of gasification reactions [12,13]. Mineral matter is also responsible for various technological problems such as fouling, slagging and inconsistency with regard to product yield and composition [13].…”

Section: Introductionmentioning

confidence: 99%