Improvement of degasification efficiency by pulsed injection of water in coal seam

The article presents the research results of parameters of the mud pulse method the loosening of outburst-hazardous coal seams in the faces of development workings system APSS-1. The results of the monitoring and evaluation of the effectiveness of pulse loosening a coal seam in static and pulsed mode of injection fluid, the main provisions of the developed techniques and additions to methods of acoustic control with a view to their use in hydroimpulsive impact. It is established that application of pulsed injection of fluid leads to a decrease in the active phase of the process pulse loosening a coal seam, to increase its efficiency and increase the speed of the output.

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Study on the Influence of Bedrock Thickness on Deformation and Failure of Overlying Soil Layer in Thin Bedrock Coal Seam Mining

Физико-технические проблемы разработки полезных ископаемых ◽

10.15372/ftprpi20200403 ◽

2020 ◽

Keyword(s):

Coal Seam ◽

Soil Layer ◽

Deformation And Failure ◽

Thin Bedrock ◽

Seam Mining

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Forecast of Methane Emission on the Working Face at Coal Seam Mining

Occupational Safety in Industry ◽

10.24000/0409-2961-2017-6-31-35 ◽

2017 ◽

Vol 6 ◽

pp. 31-35

Author(s):

V.S. Zaburdayev ◽

Keyword(s):

Coal Seam ◽

Methane Emission ◽

Working Face ◽

Seam Mining

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Phosphorus minerals in tonstein; coal seam 405 at Sośnica-Makoszowy coal mine, Upper Silesia, southern Poland

Acta Geologica Polonica ◽

10.2478/agp-2013-0012 ◽

2013 ◽

Vol 63 (2) ◽

pp. 271-281 ◽

Cited By ~ 5

Author(s):

Magdalena Kokowska-Pawłowska ◽

Jacek Nowak

Keyword(s):

Trace Elements ◽

Coal Seam ◽

Mineral Composition ◽

Coal Mine ◽

Chemical Compositions ◽

Coal Basin ◽

Upper Silesia ◽

Southern Poland ◽

Basin Area

Abstract Kokowska-Pawłowska, M. and Nowak, J. 2013. Phosphorus minerals in tonstein; coal seam 405 at Sośnica- Makoszowy coal mine, Upper Silesia, southern Poland. Acta Geologica Polonica, 63 (2), 271-281. Warszawa. The paper presents results of research on tonstein, which constitutes an interburden in coal seam 405 at the Sośnica- Makoszowy coal mine, Makoszowy field (mining level 600 m), Upper Silesia, southern Poland. The mineral and chemical compositions of the tonstein differ from the typical compositions described earlier for tonsteins from Upper Silesia Coal Basin area. Additionally, minerals present in the tonsteins include kaolinite, quartz, kaolinitised biotite and feldspars. The presence of the phosphatic minerals apatite and goyazite has been recognized. The presence of gorceixite and crandallite is also possible. The contents of CaO (5.66 wt%) and P2O5 (6.2 wt%) are remarkably high. Analysis of selected trace elements demonstrated high contents of Sr (4937 ppm) and Ba (4300 ppm), related to the phosphatic minerals. On the basis of mineral composition the tonstein has been identified as a crystalline tonstein, transitional to a multiplied one.

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