Results 21 to 30 of about 346,856 (155)
The effect of hard coal density on its flotation performance [PDF]
Acta Montanistica Slovaca, 2005 Hard coal flotation depends on many factors, one of which is the density of the grains floated. The heavier the grain, the greater the gravitational force that counteracts the force of adhesion between the grain and an air bubble, and the lower the ...
Ewa Małysa
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Using geophysical density logging to estimate the thickness and density of coal seams in the Southern region of Brazil [PDF]
REM: International Engineering JournalThis study shows the usefulness of borehole geophysical logging of density in the identification of coal seams, in relation to other lithologies present in a coal deposit located in the south of Brazil. Four drillholes were studied.
Barbara Victoria Reffatti Andrade +4 more
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A Study on the Hard Coal Grindability Dependence on Selected Parameters
Energies, 2021 A very important aspect of proper preparation of the coal mixture for the coking process is its appropriate grinding. One of the parameters describing the energy input required for grinding is the Hardgrove index.
Krzysztof Kogut +7 more
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Tools available for methane recovery from mines belonging to C.E.H. Petroşani [PDF]
MATEC Web of ConferencesMine gas is present both in coals and in the surrounding rocks and basically consists of methane (some-times almost 100%) mixed with carbon dioxide (up to 5%) with nitrogen (a few percent) and traces of carbon monoxide.
Chiuzan Emeric, Matei Adrian
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Co-firing of coal and woody biomass under conditions of reburning technology with natural gas
International Journal of Renewable Energy Development, 2023 It is a continuous imperative to establish the most efficient process of conversion of primary energy from fuel through combustion, which also has the least possible harmful effect on the environment. In this time of expressed demands for decarbonisation,
Nihad Hodžić, Kenan Kadic
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Scientific ReportsFrequent failures of roadway anchor bolts in the roof-dripping zones of the Tashan coal mine endanger roadway stability and safety. To clarify the stress-corrosion cracking (SCC) mechanism and identify mitigation strategies, we combined water-chemistry ...
Lei Wang +4 more
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Geological and Geochemical Features of Alborz Basin Coal Deposits, Iran [PDF]
Journal of Sciences, Islamic Republic of Iran, 2012 The Alborz coal basin is located in northern part of Iran. The coal deposits of Shahrood in eastern Alborz, Zirab in central Alborz and Abyek in western Alborz were studied as typical coalfields of the basin.
M. Yazdi
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Історія науки і техніки, 2020 The activity of the mining industry in the South of the Russian Empire, of which Ukraine was part at that time, is analyzed. It is noted that the rapid development of industry in the Russian Empire after the abolition of serfdom in 1861 opened up ...
Maryna Gutnyk, Serhii Radohuz
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ASPECTS REGARDING THE TECHNICAL EXPERTISE OF THE ROTATIONAL MECHANISM OF COAL MINING MACHINE - Part I [PDF]
Fiabilitate şi Durabilitate, 2019 In this paper we presents technical conditions for the rotational mechanism of the coal mining machine after we made technical expertise. The rehabilitation at the rotational mechanism will be subjected, it will be done by performing the intervention ...
Marius Liviu CÎRŢÎNĂ +2 more
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