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The influence of pressure drop on gas emissions from a mining shaft - an overview

Wrona Paweł, Różański Zenon, Pach Grzegorz, Niewiadomski Adam, Suponik Tomasz

Journal of Sustainable Mining

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2021

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Vol. 20, iss. 1

20--27

EN

Climate change can make an impact on the mining sector and post-mining sites. Among others, extreme weather events are connected with sudden and deep pressure drops which lead to gas emissions from an underground space to the surface through closed shafts. The tests undertaken in the frameworks of TEXMIN project lead to get measuring data of this phenomenon and will allow validating numerical models for further forecasts and mitigation means. Three examples of the results were presented. They showed that the intensity of pressure drop influences strongly on gas emissions from a closed shaft. Although the pressure drop process should be investigated in detail considering hourly or even more frequent variations of pressure. Considering the variation of emitted gases in the vicinity of the closed shaft they remained increased even 20-30 m from the point of emissions.

2

The impact of precipitation on the groundwater of coal waste dump

Suponik Tomasz, Franke Dawid, Frączek Robert, Nowińska Katarzyna, Pierzyna Piotr, Różański Zenon, Wrona Paweł

Journal of Sustainable Mining

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2021

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Vol. 20, iss. 1

13--19

EN

The aim of the study was to assess the effect of climate change, mainly higher and lower precipitation, on the intensity of the impact of a coal waste dump on groundwater. The analysis used meteorological data for the Katowice region in 2002-2020 as well as data on the height of the groundwater table in the vicinity of the coal waste dump, and data on physicochemical parameters and chemical composition of groundwater in 2004-2020. Based on the analyses, it was found that the periods of drought in the Silesian Voivodeship, located in the south of Poland, occurred mainly in spring, while periods of excessive short-term rainfall in summer. The period of excessive annual precipitation occurred between 2007 and 2010, followed by a long period of dry or very dry years that lasted until 2016. During the period of excess annual precipitation, the leachate from the waste dump caused a decrease in the pH of groundwater from ca. 5 to 2.50, while an increase in electrolytic conductivity (EC) and the concentration of sulphates and zinc from ca. 1300 ms/cm, 100 mg/L, 5 mg/L to 5100 ms/cm, 3890 mg/L, 18.5 mg/L, respectively.

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The impact of precipitation on state of the slopes surface and thermal activity of the mine waste dump - preliminary study

Różański Zenon, Wrona Paweł, Pach Grzegorz, Niewiadomski Adam, Suponik Tomasz, Frączek Robert, Balcarczyk Leszek

Journal of Sustainable Mining

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2021

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Vol. 20, iss. 1

2--12

EN

Precipitation, especially with a high intensity, affects the condition of mining waste dumps. The article presents the results of research aimed at determining the impact of rain on water erosion on the slopes of a coal waste dump and its thermal state. Preliminary tests of the condition of two slopes of the coal waste dump in Libiąż (Poland) undertaken in the frameworks of the TEXMIN project was carried out using modern geodesy techniques (low-ceiling photogrammetry and TLS terrestrial laser scanning). The current geometry of the slope surface was faithfully reproduced in the form of a cloud of points with known coordinates x, y, z. The thermal state within the analyzed slopes of the dump was also assessed. Based on thermography studies and measurements of temperature and gas concentrations inside the object, two zones of thermal activity were located on one of the examined slopes. The test results constitute the initial state against which the results of further tests will be compared. This will allow to determine the influence of precipitation on the amount of water erosion and the thermal state of the dump in a specific time period.

4

Przegląd pieców do obróbki cieplnej pod kątem użytkownika i zastosowania

Wrona Paweł

Stal, Metale & Nowe Technologie

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2019

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nr 7-8

26--32

PL

W dobie wyścigu technologicznego firmy produkcyjne oraz jednostki naukowo-badawcze R&D wciąż prześcigają się w produkowaniu i ulepszaniu różnych materiałów.