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2 Journal of Sustainable Mining

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Gravity and electrostatic separation of unburned coal from a selected fly ash

Wierzchowski Krzysztof, Klupa Agnieszka, Białecka Barbara, Całus Moszko Joanna

Journal of Sustainable Mining

2023

Vol. 22, iss. 1

33--40

Unburned coal grains make it difficult to use fly ash economically, which causes energy losses in the fuel. The article presents the possibilities of separating unburned coal from selected fly ash. In order to assess the possibility of separation of unburned carbon, the analysis of grain density and ash composition was used. Unburned coal was separated by four methods – one wet gravity and three dry methods. It has been found that despite very fine ash grains, the quality and quantity of separation products are significantly dependent on the separation method used and the separated grains’ qualitative characteristics. The analysis of the coal grains under an electron microscope has revealed that they contain mineral inclusions. Their presence enables selective separation of carbon without first grinding the middling grains. The most advantageous results of the separation of unburned coal were obtained by the electrostatic separation method. Separated coal can be used in high-value carbon applications.

Shaft liquidation method adjusted for high precipitation associated with climate change impact

Szymała Jan, Całus Moszko Joanna, Janson Ewa, Sobczak Dagmara, Konsek Stanisław

Journal of Sustainable Mining

2022

Vol. 21, iss. 3

216--227

In connection with the implementation of the international project TEXMIN within the framework of the RFCS fund, a project for the liquidation of the Głowacki Shaft in Rybnik (Poland) was undertaken, which takes into account the effects of climate change, i.e. evaluation of the increase of precipitation in the region. In addition to the standard research undertaken before liquidation activities, precipitation data recorded by the Institute of Meteorology and Water Management from 1995 to 2019 was collected and the precipitation variability was analysed. As a result, a method for liquidation of the shaft was selected consisting of constructing a permeable backfill column in the shaft and using a shaft pipe filled with permeable backfill material. Metallurgical aggregate was identified as a suitable backfill material, for which degradation tests, filtration coefficient tests and an assessment of its impact on water quality were carried out. It has been determined that a backfill column constructed in this manner can fulfil its function as a long-term gravity-driven water flow.