“… 93 , and showed that after outbursts in the coals of the Pechersk and Donets basins, the iron content exceeds almost twice its content in non-outburst coals of the same beds. Figure 8 Coal X-ray fluorescence spectra of 53–40 µm fraction ( a ) and 200–160 µm fraction ( b ) 93 . …”
Section: Resultsmentioning
confidence: 99%
“…8 ), Mossbauer spectroscopy, and nuclear gamma resonance of coals selected from calm zones indicate that the methane content of coals correlates with the total amount of iron 91 , and the outburst hazard of coal correlates only with the presence of ferrous iron 92 . In particular, the following coals of the Donetsk basin were studied using Mossbauer spectroscopy 93 : lean-sintering (LS), selected from the bed L 4 of the «Yasinovka Glubokaya» mine, coke (C) of the bed l 1 from the 13-bis mine, lean (L), taken from the lava No. 3 of the «Glubokaya» mine.…”
Section: Resultsmentioning
confidence: 99%
“…Paper 93 reports that "… trivalent iron is concentrated only in flat secretions in the interlayer space of coal, and ferrous iron in spherical clusters, which are more or less evenly distributed in the volume of coal matter". If we assume that nanoscale particles of iron oxides are distributed in the volume of coal matter, then the result of their reaction in an external electromagnetic field may be ambiguous.…”
Section: Resultsmentioning
confidence: 99%
“…It is known that with a decrease in particle size, the chemical activity of coal increases 28 . Figure 9 The iron concentration changes in the reduced gas coal depending on the fractional composition: Points M and E are the coal of 200–160 µm fraction treated by the magnetic and electric field of low intensity 93 . …”
Section: Resultsmentioning
confidence: 99%
“… The iron concentration changes in the reduced gas coal depending on the fractional composition: Points M and E are the coal of 200–160 µm fraction treated by the magnetic and electric field of low intensity 93 . …”
The article presents experimental results of research concerning the action of weak electric and magnetic fields on physicochemical transformations in samples of hard coal with a previously destabilized microstructure. The actions of electric and magnetic fields are fundamentally different by many parameters. It has been shown that after treatment with a weak electric field, coal posted an electret potential with an anomalously continuous charge relaxation. Compared to untreated coal samples, the rate of methane emission from methane-saturated samples is maximum for long-flame coal and decreases as it approaches anthracite. The electric field stimulates the grinding of microparticles, a decrease in the maximum gas outlet temperature, a decrease in the enthalpy value in the formation of a new phase, and an increase in the chemical activity of treated coal samples. Fundamentally different results were obtained with magnetic stimulation of coals. In X-ray diffractograms of coal powders after magnetic treatment, the values of the maxima of the main peaks are the largest in comparison with the original samples and those treated with an electric field, which is consistent with an increase in the size of microparticles in a magnetic field. There is an increase in the heat of combustion and a decrease (by 5 times) in the loss of coal mass during heating.
“… 93 , and showed that after outbursts in the coals of the Pechersk and Donets basins, the iron content exceeds almost twice its content in non-outburst coals of the same beds. Figure 8 Coal X-ray fluorescence spectra of 53–40 µm fraction ( a ) and 200–160 µm fraction ( b ) 93 . …”
Section: Resultsmentioning
confidence: 99%
“…8 ), Mossbauer spectroscopy, and nuclear gamma resonance of coals selected from calm zones indicate that the methane content of coals correlates with the total amount of iron 91 , and the outburst hazard of coal correlates only with the presence of ferrous iron 92 . In particular, the following coals of the Donetsk basin were studied using Mossbauer spectroscopy 93 : lean-sintering (LS), selected from the bed L 4 of the «Yasinovka Glubokaya» mine, coke (C) of the bed l 1 from the 13-bis mine, lean (L), taken from the lava No. 3 of the «Glubokaya» mine.…”
Section: Resultsmentioning
confidence: 99%
“…Paper 93 reports that "… trivalent iron is concentrated only in flat secretions in the interlayer space of coal, and ferrous iron in spherical clusters, which are more or less evenly distributed in the volume of coal matter". If we assume that nanoscale particles of iron oxides are distributed in the volume of coal matter, then the result of their reaction in an external electromagnetic field may be ambiguous.…”
Section: Resultsmentioning
confidence: 99%
“…It is known that with a decrease in particle size, the chemical activity of coal increases 28 . Figure 9 The iron concentration changes in the reduced gas coal depending on the fractional composition: Points M and E are the coal of 200–160 µm fraction treated by the magnetic and electric field of low intensity 93 . …”
Section: Resultsmentioning
confidence: 99%
“… The iron concentration changes in the reduced gas coal depending on the fractional composition: Points M and E are the coal of 200–160 µm fraction treated by the magnetic and electric field of low intensity 93 . …”
The article presents experimental results of research concerning the action of weak electric and magnetic fields on physicochemical transformations in samples of hard coal with a previously destabilized microstructure. The actions of electric and magnetic fields are fundamentally different by many parameters. It has been shown that after treatment with a weak electric field, coal posted an electret potential with an anomalously continuous charge relaxation. Compared to untreated coal samples, the rate of methane emission from methane-saturated samples is maximum for long-flame coal and decreases as it approaches anthracite. The electric field stimulates the grinding of microparticles, a decrease in the maximum gas outlet temperature, a decrease in the enthalpy value in the formation of a new phase, and an increase in the chemical activity of treated coal samples. Fundamentally different results were obtained with magnetic stimulation of coals. In X-ray diffractograms of coal powders after magnetic treatment, the values of the maxima of the main peaks are the largest in comparison with the original samples and those treated with an electric field, which is consistent with an increase in the size of microparticles in a magnetic field. There is an increase in the heat of combustion and a decrease (by 5 times) in the loss of coal mass during heating.
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