Balancing the amount and composition of gas contained in the pore space of cupriferous rocks

Kudasik, Mateusz; Skoczylas, Norbert

doi:10.1007/s12665-018-7331-8

Cited by 8 publications

(8 citation statements)

References 24 publications

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“…On the flip side, sample 2G contained the smallest amount of gas -3.19 cm 3 /kg -in its pore space. The obtained gas amounts in the dolomite samples approximate the amounts obtained for samples of rocks retrieved from the same area in 'Polkowice-Sieroszowice' copper mine [32].…”

Section: Balance Of Gas Contentsupporting

confidence: 70%

“…Some of the samples 1G-6G were comminuted in the GPR analyzer [31,32], whose prototype was built at the Strata Mechanics Research Institute of the Polish Academy of Sciences ( Fig. 3).…”

Section: Research Materials and Measurement Methodsmentioning

confidence: 99%

“…The process of balancing the gas contained in the pore space of the rocks was performed using an original devise known as the GPR analyzer [31,32]. The objective of balancing the gas released from the pore space of the studied rocks was to confirm the correctness of the prior validation.…”

Section: Balance Of Gas Contentmentioning

confidence: 99%

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The Validation Process of the Method of Balancing Gas Contained in the Pore Space of Rocks via Rock Comminution

Kudasik¹,

Pajdak²,

Skoczylas³

2018

Preprint

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The article discusses the validation process of a certain method of balancing gas contained in the pore space of rocks. The validation was based upon juxtaposition of the examination of rocks' porosity and the effects of comminution in terms of assessing the possibility of opening the pore space. The tests were carried out for six dolomite samples taken from different areas of the 'Polkowice-Sieroszowice’ copper mine in Poland. Before the rock material was ground, it was examined using the porosimetric method and subsequently subjected to the SEM analysis. After grinding, the research material was subjected to the granulometric analysis. Prior to the grinding process, the rocks' porosity fell in the range of 0.3-14.8%, while the volume of the open pores was included in the 0.01-0.06 cm3/g range. The research material was also characterized by inhomogeneous distribution of the pore volume. The grinding process was performed using an original device – the GPR analyzer. The ground samples were characterized by similar particle size distribution and mean diameters D_3.2 of about 4.0-4.5 µm. The SEM analysis revealed pores of various size and shape on the surface of the rock cores, while at the same time demonstrating lack of pores following the grinding process. The grain size distribution curves were compared with the cumulative pore volume curves of the cores before grinding. The resulting intersection points of both curves were seen as testifying to the presence of openings in the rock pores and release of the accumulated gas. The opening percentage of the pore space was associated with the coordinates of the curves' intersections. In order to confirm the argument put forward in this paper – i.e. that comminution of a rock to grains of a size comparable with the size of the rock's pores results in the release of gas contained in the pore space – the amount of gas released as a result of the comminution process was studied. The results of gas balancing demonstrated that the pore space of the investigated dolomites was filled with gas in amounts from 3.19 cm3/kg to 45.86 cm3/kg. The obtained results of the rock material comminution to grains comparable – in terms of size – to the size of the pores of investigated rocks, along with asserting the presence of gas in the pore space of the studied dolomites, were regarded as a proof that the method of balancing gas in rocks via rock comminution is correct.

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Section: Balance Of Gas Contentsupporting

confidence: 70%

“…Some of the samples 1G-6G were comminuted in the GPR analyzer [31,32], whose prototype was built at the Strata Mechanics Research Institute of the Polish Academy of Sciences ( Fig. 3).…”

Section: Research Materials and Measurement Methodsmentioning

confidence: 99%

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The Validation Process of the Method of Balancing Gas Contained in the Pore Space of Rocks via Rock Comminution

Kudasik¹,

Pajdak²,

Skoczylas³

2018

Preprint

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“…this incident resulted in ejected rock material being deposited along approximately 30 metres of the mine heading. As of today, several hundred less severe Gas-geodynamic phenomena have been recorded in copper mines in the Legnica-Głogów Copper belt (lGOM), including cave ceiling collapses and sudden outflows of gas from boreholes [15].…”

Section: Gas-geodynamic Phenomenamentioning

confidence: 99%

Archives of Mining Sciences

2022

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Force exerted by Gas on Material ejected durinG Gas-GeodynaMic phenoMena. analysis and experiMental VeriFication oF theoryThe analysis of natural hazards, including gas-geodynamic phenomena, requires study of the basic physical processes that take place at each stage of an event. This paper focuses on analysing the transport of fragmented rock material during rock and gas outbursts. Our theoretical considerations and experiments have allowed us to specify and verify the significant forces acting on fragmented rock during its transport, thus determining the speed of grains of each grain class in the stream of expanding gas. The above study may serve as a preface to a wide-ranging quantitative and qualitative energy analysis of the movement of material ejected during Gas-geodynamic phenomena.

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“…In the past decade, in Polish copper mining regions, the presence of gas in the pores of copper-bearing rocks has been reported with increasing frequency, particularly in carbonate rocks [ 14 ]. The first serious outburst in a copper ore mine took place on 6 September 2009 [ 15 ] at the O/ZG Rudna mine.…”

Section: Introductionmentioning

confidence: 99%

The Intensity of Heat Exchange between Rock and Flowing Gas in Terms of Gas-Geodynamic Phenomena

Koziel

Topolnicki

Skoczylas

2021

Entropy

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Gas-induced geodynamic phenomena can occur during underground mining operations if the porous structure of the rock is filled with gas at high pressure. In such cases, the original compact rock structure disintegrates into grains of small dimensions, which are then transported along the mine working space. Such geodynamic events, particularly outbursts of gas and rock, pose a danger both to the life of miners and to the functioning of the mine infrastructure. These incidents are rare in copper ore mining, but they have recently begun to occur, and have not yet been fully investigated. To ensure the safety of mining operations, it is necessary to determine parameters of the rock–gas system for which the energy of the gas will be smaller than the work required to disintegrate and transport the rock. Such a comparison is referred to as an energy balance and serves as a starting point for all engineering analyses. During mining operations, the equilibrium of the rock–gas system is disturbed, and the rapid destruction of the rock is initiated together with sudden decompression of the gas contained in its porous structure. The disintegrated rock is then transported along the mine working space in a stream of released gas. Estimation of the energy of the gas requires investigation of the type of thermodynamic transformation involved in the process. In this case, adiabatic transformation would mean that the gas, cooled in the course of decompression, remains at a temperature significantly lower than that of the surrounding rocks throughout the process. However, if we assume that the transformation is isothermal, then the cooled gas will heat up to the original temperature of the rock in a very short time (<1 s). Because the quantity of energy in the case of isothermal transformation is almost three times as high as in the adiabatic case, obtaining the correct energy balance for gas-induced geodynamic phenomena requires detailed analysis of this question. For this purpose, a unique experimental study was carried out to determine the time required for heat exchange in conditions of very rapid flows of gas around rock grains of different sizes. Numerical simulations reproducing the experiments were also designed. The results of the experiment and the simulation were in good agreement, indicating a very fast rate of heat exchange. Taking account of the parameters of the experiment, the thermodynamic transformation may be considered to be close to isothermal.

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Balancing the amount and composition of gas contained in the pore space of cupriferous rocks

Cited by 8 publications

References 24 publications

The Validation Process of the Method of Balancing Gas Contained in the Pore Space of Rocks via Rock Comminution

The Validation Process of the Method of Balancing Gas Contained in the Pore Space of Rocks via Rock Comminution

Archives of Mining Sciences

The Intensity of Heat Exchange between Rock and Flowing Gas in Terms of Gas-Geodynamic Phenomena

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