Coal Cleaning Versus the Reduction of Mercury and other Trace Elements’ Emissions from Coal Combustion Processes

Zajusz-Zubek, Elwira; Konieczyński, Jan

doi:10.2478/aep-2014-0012

Cited by 22 publications

(12 citation statements)

References 21 publications

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“…This could be obtained in the coal washing process, which is well known and commercialized (Rallo et al 2012 ). The possibility of removing significant amounts of mercury from coal in this process was confirmed in the following studies: Dziok et al ( 2015b ), Zajusz-Zubek and Konieczyński ( 2014 ), Pan et al ( 2017 ), and Pyka and Wierzchowski ( 2016 ). However, the effectiveness of mercury removal from coal is varied and it is closely related to the mode of mercury occurrence in coal.…”

Section: Introductionmentioning

confidence: 75%

Studies on mercury occurrence in inorganic constituents of Polish coking coals

Dziok

Strugała

Włodek

2018

Environ Sci Pollut Res

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During the cokemaking process, a significant amount of mercury occurring in a coal blend is released to the atmosphere. One of the ways of reducing this emission is to reduce mercury content in a coal blend. This could be obtained through the coal washing process. The optimization of this process requires the knowledge of mercury occurrence in coal, especially in its inorganic constituents. A qualitative analysis of mercury occurrence in the inorganic constituents of Polish coking coals was performed using an electron probe microanalyzer (EPMA). For that purpose, selected samples of rejects and middling products derived from the washing process in dense media separators and jig concentrators were examined. The obtained results have confirmed a strong connection between mercury occurrence and the presence of sulfides (pyrite, marcasite, and chalcopyrite) in Polish coking coals. Significant amounts of mercury were also noticed for barite, siderite, and aluminosilicates. The highest value of mercury content, at the level of 0.100%, was obtained for marcasite. For the analyzed coals, the effectiveness of mercury removal in the washing process was determined by the forms of pyrite occurring in coal. The highest values of effectiveness of mercury removal were obtained in the case of coals for which the large framboidal pyrite aggregates with chalcopyrite overgrowths were noticed. It was also found that middling products were characterized by the occurrence of the Hg-rich overgrowths of pyrite on organic matter. To achieve a significant reduction in mercury content in clean coal, it is necessary to develop an effective method of removing this form of pyrite from hard coal.

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Section: Introductionmentioning

confidence: 75%

Studies on mercury occurrence in inorganic constituents of Polish coking coals

Dziok

Strugała

Włodek

2018

Environ Sci Pollut Res

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“…The soil in the urban areas (residential areas, parks, roadsides) usually has low or medium-high magnetic susceptibility, also in other regions of the world (Lu and Bai, 2006;Aguilar-Reyes et al, 2011Magiera et al, 2013). Burning coal in home furnaces and small boiler rooms in the residential areas is still the main source of the dust pollution in Poland and in many countries that utilize coal as their main energy resource (Konieczyński and Stec, 2009;Zajusz-Zubek and Konieczyński, 2014;Hławiczka et al, 2001). In the Rybnik area, the percentage of the particulate matter from the flat heating processes (in the general concentration of the dust coming from various emitters) was as much as 49% in (Hławiczka et al, 2012.…”

Section: Lateral Changesmentioning

confidence: 98%

Spatial variation of soil magnetic susceptibility in relation to different emission sources in southern Poland

et al. 2015

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“…However, due to the new Best Available Techniques (BAT) Conclusions for large power plants (BAT-LCP 2017 ) approved by the European Commission in April 2017, which tighten up the SO 2 emission standards and introduce restrictions on the emission of mercury (Hg) into the atmosphere, it will be necessary to improve the quality of coal used for combustion processes (Makowska et al 2017b ). Several studies (Akers and Dospoy 1994 ; Zhu et al 2015 ; Makowska et al 2014 , 2016 ; Dziok et al 2014 ; Zajusz-Zubek and Konieczyński 2014 ) have shown that the coal cleaning processes constitute an effective method for removing ecotoxic elements (such as Hg) from coal, thereby lowering the emission of these elements to the environment in the processes of combustion, gasification, and pyrolysis. On the other hand, the waste produced during coal cleaning can pose a threat to the environment because of the accumulation of ecotoxic elements mostly in this waste.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the content, occurrence, and leachability of arsenic, lead, and thallium in wastes from coal cleaning processes

Makowska

Strugała

Wierońska

et al. 2018

Environ Sci Pollut Res

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The aim of the study was to evaluate the content, occurrence, and leachability of arsenic (As), lead (Pb), and thallium (Tl) in wastes from coal cleaning processes with respect to the safe management of this waste. The study focused on wastes resulting from the wet gravitation and flotation processes employed for the purposes of coking coal cleaning in four coal mines situated in the Upper Silesian Coal Basin (Poland). The scope of the study included (i) determination of the content of these elements in the investigated wastes using atomic absorption spectrometry, (ii) evaluation of their mode of occurrence using electron microprobe analysis, and (iii) preliminary assessment of their leachability in deionized water. The content of the analyzed elements in the examined samples of coal waste was twice as high as the average content of these elements in the Earth’s crust. The contents of As and Pb, however, did not exceed their permissible contents in inert waste in accordance with Polish legal regulations based on EU directives. The limit on the content of Tl is not specified by these regulations, but its amount in the examined samples was similar to that occurring in the soils. Moreover, leaching tests have shown that these elements are hardly eluted from the analyzed material. Their content in the water leachates was generally lower than the detection limit of the analytical method, complying with the standards for good and very good water quality. Low leachability of these elements most probably results from their mode of occurrence in the investigated wastes. The chemical analysis using an electron microprobe and the analysis of the correlation between these elements, e.g., total and pyritic sulfur, have shown that Pb, As, and Tl are mainly found in sulfide minerals which are characterized by negligible solubility. In conclusion, the investigated hard coal processing waste does not constitute a threat to the environment and can be commercially used or safely neutralized, e.g., by landfilling.

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Coal Cleaning Versus the Reduction of Mercury and other Trace Elements’ Emissions from Coal Combustion Processes

Cited by 22 publications

References 21 publications

Studies on mercury occurrence in inorganic constituents of Polish coking coals

Studies on mercury occurrence in inorganic constituents of Polish coking coals

Spatial variation of soil magnetic susceptibility in relation to different emission sources in southern Poland

Assessment of the content, occurrence, and leachability of arsenic, lead, and thallium in wastes from coal cleaning processes

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