Vertical distribution of elements in Deposit No. 1, Hat Creek, British Columbia: a preliminary study

2020

Minerals

As there are numerous claims that the mode of occurrence of trace elements in coal influences the quality of the substrates as well as the course and results of the coal preparation processes, it is necessary to analyse the differences in the mode of occurrence of the elements in coal within a coal basin or a coal deposit. With the use of concentration distribution functions and the Pearson correlation coefficient, it was concluded that (1) mineral matter plays a significant and nearly constant or constant role in concentrating V, Cr, Co, As, Rb, Sr, Ba, and Pb in coal; (2) organic matter plays a stable role in concentrating Sn; and (3) there are significant differences in the role of organic and mineral matter in concentrating Mn, Ni, Cu, Zn, Mo, Cd, and Sb in coal throughout the USCB (Upper Silesian Coal Basin). Moreover, there was observed a difference in the mode of occurrence of Cr, Mn, Co, Ni, Cu, Zn, Mo, Cd, Sn, and Sb in coal in the vertical profile of the USCB. At the same time, there were observed no differences and a stable significant role of mineral matter in concentrating V, As, Rb, Sr, Ba, and Pb in coal, while the role of the petrographic groups of the coal components in concentrating the elements in raw coal was differentiated. It is believed that the difference in the mode of occurrence of the trace elements in coal within coal seams and coal deposits is a geochemical regularity.

Section: Interpretation Of Variability In the Mode Of Occurrence Of Esupporting

confidence: 82%

Spatial Macroscale Variability of the Role of Mineral Matter in Concentrating Some Trace Elements in Bituminous Coal in a Coal Basin—A Case Study from the Upper Silesian Coal Basin in Poland

2020

Minerals

“…In contrast, previous studies on raw coal from the LCB indicate a binding of Ag to a comparable degree to clay minerals and vitrinite [71], and Zn to both organic and mineral raw coal [76]. The binding mode of trace elements in coal is probably differentiated in raw coal within the basin and individual lithostratigraphical series [5,[77][78][79], and even in individual parts of a single coal seam [80,81]. The content and mode of binding of EE in coal feeds is probably different before and different after the removal of mineral matter from the coal feeds at the mineral enrichment plant [30,31,[82][83][84][85][86].…”

Section: Evaluation Of the Content And Mode Of Occurrence Of Elementsmentioning

confidence: 86%

Distribution of Some Ecotoxic Elements in Fuel and Solid Combustion Residues in Poland

Róg

2020

Energies

The purpose of this paper is to assess the content and distribution of some elements in coal from two bituminous coal basins and in fly ash and slag derived from combustion of the coals in six power plants in Poland. The petrographic composition and distribution of elements were characterized in the tested samples, using reflected light microscope, X-ray powder diffractometer, inductively coupled plasma atomic emission spectroscopy, and scanning electron microscope with energy dispersive X-ray. The highest content of elements in coal occurs in siderite. In Al-Si particles, as well as in magnetite with skeletal and dendritic structure crystallized on the surface of Al-Si microspheres or cenospheres included in fly ash size < 0.05 mm and in the magnetic fraction of slag, the highest content of elements was noted. Due to the content of elements, fly ash and slag were considered to be neutral for the soil environment. Correlations, which have not been described before, have been observed between the likely mode of binding of some elements in coal and their distribution in fly ash and slag. These correlations could be of particular value when predicting the content and distribution of elements in combustion residues and in the assessment of their environmental toxicity.

“…Based on the literature and the current understanding, it may be concluded that it is an expected tendency. The often described variability of coal quality within a coal basin, a coal deposit and a coal seam, in Poland (e.g., [83,[113][114][115]), and around the world (vast literature, (e.g., [5,8,9,116]), together with the methods of purification and carbonization of feed coal, commonly applied in PS, make it impossible to expect constant petrographic and chemical properties of the feed coal. It is assumed that the content and probably also the mode of occurrence of the trace elements in coal is different before and after coal cleaning of the mineral matter interlayers (e.g., [117][118][119][120][121]).…”

Section: Distribution and Mode Of Occurrence Of The Elements In Coal And Combustion Residuesmentioning

confidence: 99%

Distribution and Mode of Occurrence of Co, Ni, Cu, Zn, As, Ag, Cd, Sb, Pb in the Feed Coal, Fly Ash, Slag, in the Topsoil and in the Roots of Trees and Undergrowth Downwind of Three Power Stations in Poland

Róg

2021

Minerals

It is supposed that the determination of the content and the mode of occurrence of ecotoxic elements (EE) in feed coal play the most significant role in forecasting distribution of EE in the soil and plants in the vicinity of power stations. Hence, the aim of the work was to analyze the properties of the feed coal, the combustion residues, and the topsoil which are reached by EE together with dust from power stations. The mineral and organic phases, which are the main hosts of EE, were identified by microscopy, X-ray powder diffraction, inductively coupled plasma atomic emission spectrometry, and scanning electron microscope with an energy dispersive X-ray methods. The highest content of elements was observed in the Oi and Oe subhorizons of the topsoil. Their hosts are various types of microspheres and char, emitted by power stations. In the areas of long-term industrial activity, there are also sharp-edged grains of magnetite emitted in the past by zinc, lead, and ironworks. The enrichment of the topsoil with these elements resulted in the increase in the content of EE, by between 0.2 times for Co; and 41.0 times for Cd in the roots of Scots pine, common oak and undergrowth, especially in the rhizodermis and the primary cortex and, more seldom, in the axle roller and cortex cells.