Applied sciences

Archives of Mining Sciences

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Archives of Mining Sciences | 2018 | vol. 63 | No 4 |

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Abstract

The petrographic composition of coal has a significant impact on its technological and sorption properties. That composition is most frequently determined by means of microscope quantitative analyses. Thus, aside from the purely scientific aspect, such measurements have an important practical application in the industrial usage of coal, as well as in issues related to the safety in underground mining facilities. The article discusses research aiming at analyzing the usefulness of selected parameters of a digital image description in the process of automatic identification of macerals of the inertinite group using neural networks. The description of the investigated images was based on statistical parameters determined on the basis of a histogram and co-occurrence matrix (Haralick parameters). Each of the studied macerals was described by means of a 20-element feature vector. An analysis of its principal components (PCA) was conducted, along with establishing the relationship between the number of the applied components and the effectiveness of the MLP network. Based on that, the optimum number of input variables for the investigated classification task was chosen, which resulted in reduction of the size of the network’s hidden layer. As part of the discussed research, the authors also analyzed the process of classification of macerals of the inertinite group using an algorithm based on a group of MLP networks, where each network possessed one output. As a result, average recognition effectiveness of 80.9% was obtained for a single MLP network, and of 93.6% for a group of neural networks. The obtained results indicate that it is possible to use the proposed methodology as a tool supporting microscopic analyses of coal.

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Authors and Affiliations

Marta Skiba
Mariusz Młynarczuk
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Abstract

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. 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 grinding process was performed using an original device – the GPR analyzer. 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. 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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Authors and Affiliations

Mateusz Kudasik
Anna Pajdak
Norbert Skoczylas

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Name(s) of the author(s) should be provided in parentheses. e.g.: (Brandt, 1993), (Crosdale & Beamish, 1994). (Dziurzynski et al., 1990) in the case of one, two or more than two authors, respectively. If the name(s) of the author(s) is included in the text, then the reference should be cited as follows e.g.: „According to Brandt (1993)...”

Example of bibliography.

Brandt, J., 1993. Neuere Erkentnisse auf dem Gebiet der Gasausbruchprognose. Glückauf Forschungshefte 54, 5, 228-233.

Crosdale, P. J., Beamish, B.B., 1994. Methane sorption studies at South Bulli (NSW) & Central (QLD) collieries using a high-pressure microbalance. 28 Newcastle Symposium on „Advances in the study of Sydney Basin”, Newcastle, NSW, Australia, 15-17 April, 118-125.

Dziurzynski, W., Trutwin W., Tracz J., 1990. Symulacja komputerowa przepływu powietrza i gazów powyrzutowych w sieci wentylacyjnej kopalni. J. Litwiniszyn (Ed.), Górotwór jako ośrodek wielofazowy; Wyrzuty skalno-gazowe. Wydawnictwo AGH, Kraków, Vol. II, 743-758.

Lama R. D., Bodziony, J., 1996. Outbursts of gas, coal and rock in underground mines. Publisher Lama & Associates, 130 Brokers Road, Mt. Pleasant, NSW 2519, Australia.

Nekrasovski, Ya. E., 1951. Razrabotka plastov podverzhennykh vnezapnym vybrosam ugla i gaza. Ugletekhizdat, Moskva.

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