Design and Construction of Foundations for Industrial Facilities in the Areas of Former Post-Mining Waste Dumps

Łupieżowiec, M.; Rybak, Jarosław; Różański, Zenon; Dobrzycki, Przemysław; Jędrzejczyk, Witold

doi:10.3390/en15165766

Cited by 19 publications

(12 citation statements)

References 33 publications

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“…The mining material is characterized primarily by rocks and rock material (clay stones, mudstones, sandstones, etc.). There are also large amounts of silica (SiO 2 ) in it, alumina (Al 2 O 3 ), iron oxides (Fe x O y ), potassium oxide (K 2 O), carbon (C) and calcium oxide (CaO), sodium oxide (Na 2 O), or titanium oxide (TiO 2 ) [37,38]. The mineralogical composition of the tailings sample from the thermally active Heřmanice spoil heap is presented in Table 3.…”

Section: Mineralogical-petrographic Characteristics Of Tailingsmentioning

confidence: 99%

The Use of Construction Waste to Remediate a Thermally Active Spoil Heap

et al. 2023

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This article presents the results of experimental research on the possible use of construction and demolition waste (CDW) to improve the properties of unburnt tailings originating from the thermally active spoil heap in Heřmanice (Ostrava, Czech Republic). Mining activity anywhere in the world generally entails a lot of negative impacts on the environment, which are of a long-term nature. One of the most pressing challenges in the remediation of the consequences of mining activity is the thermal activity of spoil heaps associated with the high acidity of the tailings. Active acidity (pH/H2O), exchangeable acidity (pH/CaCl2), hydrolytic acidity (Ha), and elemental composition of tailings and CDW have been monitored. Based on an acidity study, it has been proven that compared to burnt tailings (pH/H2O = 8.4, pH/CaCl2 = 8.9 and Ha = 1.4 mmol kg−1), unburnt tailings show acidic properties (pH/H2O = 3.7, pH/CaCl2 = 3.6 and Ha = 205 mmol kg−1). The bioavailability of two selected potentially toxic elements (PTEs), namely Al and Fe, was examined based on the elemental composition. BCR sequential extraction analysis was used to determine their bioavailability. It has been proven that mixing CDW with tailings has a positive effect on the pH value, which has a positive effect on the further development of the entire site. The increase in the pH value is provably dependent on the amount of construction waste added, so it can be said that the increasing amount of construction waste will result in improved parameters of the burnt tailings. The results of the BCR analysis show that aluminum from the tailings will be released both from the reducible and oxidisable fractions, where it will be mainly bound to sulphides. The relatively high concentration of Fe in the oxidisable fraction (2002 mg Fe kg−1) suggests that Fe is bound to sulphides in the tailings, and it is due to the high residual pyrite and sulphide content in the dumped material, as expected. This work has found no limits where CDW no longer positively affects the acidity of unburnt tailings. For practical application, however, it is important that the mixture of CDW and tailings is properly mixed and then used for remediation.

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Section: Mineralogical-petrographic Characteristics Of Tailingsmentioning

confidence: 99%

The Use of Construction Waste to Remediate a Thermally Active Spoil Heap

et al. 2023

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“…Despite the decrease in the use of coal for energy production in the last years, the global share of the total energy supplied by this source in 2019 was 26.8%, with 162.4 EJ [5]. During this year, Russia's coal production was 430 Mt, making it the sixth largest producer in the world [6,7]. The influence of coal in this country is also demonstrated by the presence of many companies dedicated to this fuel.…”

Section: Introductionmentioning

confidence: 99%

“…The influence of coal in this country is also demonstrated by the presence of many companies dedicated to this fuel. At the end of 2015, there were 245 coal mining producer in the world [6,7]. The influence of coal in this country is also demonstrated by the presence of many companies dedicated to this fuel.…”

Section: Introductionmentioning

confidence: 99%

Potential of CBM as an Energy Vector in Active Mines and Abandoned Mines in Russia and Europe

et al. 2023

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The energy sector is in the spotlight today for its contribution to global warming and its dependence on global geopolitics. Even though many countries have reduced their use of coal, the COVID-19 crisis, the drop in temperatures in Central Asia, and the war between Russia and Ukraine have shown that coal continues to play an important role in this sector today. As long as we continue to depend energetically on coal, it is necessary to create the basis for the successful extraction and industrial use of coal mine methane (CMM), for example, as an unconventional energy resource. Early degassing technology is a technique that allows for the extraction of the methane contained within the coal seams. The application of this technology would reduce emissions, improve mine safety, and even increase their profitability. However, this technology has been understudied and is still not implemented on a large scale today. Moreover, mines with this technology generally burn the extracted methane in flares, losing a potential unconventional fuel. This study, therefore, presents different scenarios of the use of coalbed methane (CBM), with the aim of generating an impact on pollutant emissions from coal mines. To this end, a model has been designed to evaluate the economic efficiency of degasification. In addition, an emissions analysis was carried out. The results showed that the use of this technology has a negative impact on the economy of mines, which can be completely reversed with the use of CBM as fuel. Furthermore, it is observed that degasification, in addition to reducing the number of accidents in coal mining, reduces emissions by 30–40%.

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“…Currently, the accumulated gangue exceeds six billion tons in China, and the annual increase is about 500~800 million tons [ 12 ]. The incorporation of solid waste into underground backfill provides an efficient strategy for the waste utilization and disposal [ 12 , 13 , 14 ], which minimizes problems caused by its exposure to the environment [ 11 , 15 ]. Grouting backfill materials (GBMs) based on coal gangue (CG) are highly desirable in coal mining in terms of their accessibility to abundant CG and the urgent demand for utilization and disposal of existing and continuously generated CG [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Performance Optimization of Grouting Backfill Material Based on Mechanically Ground Coal Gangue Utilizing Urea and Quicklime

Wang

Zhang

et al. 2023

Materials

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Previously conducted studies have established that grouting backfill in mining-induced overburden bed separation and mined-out areas with broken rocks provides an efficient strategy to control strata movement and surface subsidence caused by underground mining. Grouting backfill materials (GBMs) based on coal gangue (CG) are highly desirable in coal mining for accessibility to abundant CG and urgent demand for CG disposal. However, CG is generally employed as coarse aggregate due to rather rigid and inert properties, limiting its application in GBMs. Herein, to reduce reliance on fine aggregates, such as fly ash and clay, cemented GBM formulations using ground CG powder as a dominant component were proposed. Urea and quicklime were utilized as additives to optimize slurry transportability and compressive strength. Besides typical grinding without additives, CG powder was also prepared via grinding with urea, intending to enhance the hydrogen bonding (HB) interaction between urea and minerals contained in CG. The effect of grinding time and urea on CG particle size and phase composition was investigated. Then, the dependence of slurry transportability and compressive strength on grinding time, solid concentration, urea, and quicklime dosage were revealed. It has been experimentally proved that grinding for 30~90 min significantly decreased CG particle size and even induced crystal deformation of dolomite and kaolinite. For GBMs, urea improved slurry flowability, possibly caused by decreased water absorption on the CG surface and the release of water encapsulated in hydrated cement particles. Moreover, quicklime strengthened GBM bodies, which could be explained by an accelerated pozzolanic reaction between CG powder and additional CH supplied by quicklime hydration. G60U3-based GBM-B2 with 5% quicklime provided a stable and smooth slurry with a bleeding rate of 1.25%, a slump flow of 205 mm, and a hardened body with a seven-day UCS of 1.51 MPa.

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Design and Construction of Foundations for Industrial Facilities in the Areas of Former Post-Mining Waste Dumps

Cited by 19 publications

References 33 publications

The Use of Construction Waste to Remediate a Thermally Active Spoil Heap

The Use of Construction Waste to Remediate a Thermally Active Spoil Heap

Potential of CBM as an Energy Vector in Active Mines and Abandoned Mines in Russia and Europe

Experimental Study on Performance Optimization of Grouting Backfill Material Based on Mechanically Ground Coal Gangue Utilizing Urea and Quicklime

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