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Geochemical Study of Weathered Coal, a Co-Substrate for

2019-12-11  Coal mining is the process of extracting coal from the ground. Coal is valued for its energy content, and, since the 1880s, has been widely used to generate electricity [1].

Safety Mining Technology of Coal Seams in

2018-12-20  The upper and lower limit heights of coal mining in the working face 1512(3) are −391 m and −497 m, respectively. The coal bed pitch is 5°–8°. Oblique mining is adopted, which has +17.32 to +22.12 m corresponding elevation.

Beneficiation of weathered coal: analysis of two oxidised

2020-3-19  severe weathering of the coal may be encountered at the time of re-mining. In order to evaluate the potential of analytical techniques to identify weathering of coal, two samples of oxidised coal were subjected to analysis. The aim of the study was to establish whether available analytical techniques could identify weathered coal.

Geochemical Study of Weathered Coal, a Co

Here, the role of outcrop weathered coal as a mineral/carbon source to ensure biologically induced humic acid-like substance enrichment of discard and spoil to increase efficacy

SafetyMiningTechnologyofCoalSeamsinWeatheredZone

e upper and lower limit heights of coal mining in the workingface1512(3)are−391mand−497m,respectively. ecoalbedpitchis5 ° –8 ° .Obliqueminingisadopted,which

Study on mining failure law of the weak and

2018-7-25  So the movement process of weak and weathered composite roof in the thin bedrock working surface has been obtained, that is: after the coal mining, the lower mudstone first collapses; the upper weak and weathered rock layers are separated from each other and subsided separately; with mining, the lower part of the weak and weathered rock layers laps with mined-out gangue, the amount of bed separation between the weak and weathered

Coal Mining on the Highveld and its Implications for

2009-11-1  Coal mining methods are briefly discussed as they have important environmental implications. There are three different methods used to extract coal: bord and pillar mining (or room and pillar), longwall mining and opencast mining. supplies the deeper weathered rock aquifer. The aquifers fill with water in the rainy season, and slowly

Effects of vegetation and fertilization on weathered

2005-9-30  Combined application of sewage sludge and chemical fertilizer in weathered particles of coal gob (WPCG) was studied by pot-scale trials. The accumulation of available nutrients and weathering process of coal gob piles were also investigated by field trial.

Coal mining under aquifers in China: a case study

2004-6-1  The hydrogeological conditions are very complex in many coal mines in China. Water inrushes from aquifers near mining coal seams occur frequently, and coal mines often suffer from serious water disasters during coal extraction. Therefore, mining safety from groundwater hazards is a common concern of both mine operators and researchers.

Beneficiation of Weathered Coal

2020-3-19  coal. Since a number of years may have elapsed between the original extraction of the coal and the recovery of the pillar coal, it may be expected that the coal left in the pillars could be weathered. Weathering of coal is a degenerative process and is known to have several negative effects on coal.

Safety Mining Technology of Coal Seams in

2018-1-1  Free Online Library: Safety Mining Technology of Coal Seams in Weathered Zone Based on Ground J-Type Pregrouting Reinforcement.(Research Article) by "Advances in Civil Engineering"; Engineering and manufacturing Coal industry Analysis Laws, regulations and rules Safety and security measures Technology application Coal mining Mineral industry Mining industry

Beneficiation of weathered coal: analysis of two oxidised

2020-3-19  severe weathering of the coal may be encountered at the time of re-mining. In order to evaluate the potential of analytical techniques to identify weathering of coal, two samples of oxidised coal were subjected to analysis. The aim of the study was to establish whether available analytical techniques could identify weathered coal.

Study on mining failure law of the weak and

2018-7-25  The No. 3 coal seam of the Shanxi Formation is the main mining coal in the mine field (figure 2), the direct water-filled aquifer is the sandstone fracture aquifer of weak water abundance in the Shanxi Formation, and overlying the aquifers are separated by impermeable layers of the Shihezi Formation.It has poor recharge conditions and weak aquosity without hydraulic connection when no

Study on mining failure law of the weak and

In this paper, the occurrence characteristics of the weak and weathered overburden, and hydrogeological features, are first analyzed in a research coal field. The overburden failure law and the development of ‘Three Zones’ are studied through physical model tests, and the rupture pattern and rock failure are analyzed in the conditions of mining under a weakly cemented roof with longwall

Microstructure of Coal Gangue and Precipitation of

2017-11-23  Some of the coal gangue used in solid backfilling coal mining is fresh, that is, just out of the well or obtained directly from sorting at the downhole; however, some is weathered gangue obtained from the ground gangue hill after long-time weathering [4, 5]. The microstructures and mineral compositions of fresh and weathered coal gangue are

Effects of vegetation and fertilization on weathered

2005-9-30  In order to study whether the nutrient has been accumulated in the topsoil of coal gob piles eight years after reclamation was initiated, the weathered particles from coal gob piles were collected in each plot at 0–20 and 20–40 cm. Available nutrients at 0–20 and 20–40 cm were analyzed immediately by the same methods .

5. Mining: Methods and Impacts Surface Coal Mining

2021-5-9  -70- Western Coal Basins The large mining operations of western coal basins have a long period of coal extraction often lasting for a decade or more, and they occupy large areas relative to most eastern mines. ~ ~ The aquifer systems in western coal basins can be extensive, and several different aquifers, with differing recharge areas, may

Coal Mining on the Highveld and its Implications for

2009-11-1  COAL MINING ON THE HIGHVELD AND ITS IMPLICATIONS FOR FUTURE WATER QUALITY IN THE VAAL RIVER SYSTEM . T S MCCARTHY and K PRETORIUS . INTRODUCTION . The history of coal mining in South Africa is closely linked with the economic development of the country. Commercial coal mining commenced in the eastern Cape near Molteno in 1864.

Improving Soil Enzyme Activities and Related Quality

2011-12-23  This study revealed that application of weathered coal significantly improved the quality of soil aggregates, increased the content of water stable

Beneficiation of Weathered Coal

2020-3-19  coal. Since a number of years may have elapsed between the original extraction of the coal and the recovery of the pillar coal, it may be expected that the coal left in the pillars could be weathered. Weathering of coal is a degenerative process and is known to have several negative effects on coal.

Study on mining failure law of the weak and

2018-7-25  The No. 3 coal seam of the Shanxi Formation is the main mining coal in the mine field (figure 2), the direct water-filled aquifer is the sandstone fracture aquifer of weak water abundance in the Shanxi Formation, and overlying the aquifers are separated by impermeable layers of the Shihezi Formation.It has poor recharge conditions and weak aquosity without hydraulic connection when no

Beneficiation of weathered coal: analysis of two oxidised

2020-3-19  severe weathering of the coal may be encountered at the time of re-mining. In order to evaluate the potential of analytical techniques to identify weathering of coal, two samples of oxidised coal were subjected to analysis. The aim of the study was to establish whether available analytical techniques could identify weathered coal.

South Africa’s mining industry weathered COVID-19

2020-10-6  The mining industry weathered the COVID-19 storm, mostly unscathed, and certainly better than many other sectors. Read more about COVID-19 Mining companies have continued to enjoy the gains in commodity prices, assisted by a weaker rand, as platinum basket prices increased and investors turned to gold as a safe investment amid concerns about

Analysis of particle breakage phenomena of

The weathered coal samples were tested by a laser detector computer monitored twin pendulum device to measure the comminution energy of breakage particles. The single particle breakage tests were conducted with the three particle sizes (-16.0 + 13.2 mm, -13.2 + 11.2 mm, -11.2 + 9.5 mm) of two types of weathered coal at five input energy levels.

Geology and production of humate and weathered

@article{osti_7043163, title = {Geology and production of humate and weathered coal in New Mexico}, author = {Roybal, G H and Barker, J M}, abstractNote = {Humic-acid-rich deposits exist in Arkansas, Florida, Louisiana, New York, North Dakota, Michigan, Minnesota, Texas, and Wyoming, and in New Mexico. New Mexico humic deposits are associated with coal in the northwestern part of the state

Comparison of Designs for the Dewatering of Coal, Gold

2009-11-1  mining. The low rainfall and absence of very high yielding aquifers, has meant that the control of mine water inflows were often accommodated in the run-of-mine design. Designs for coal, gold and diamond open pits are very similar. Water is collected at the lowest point in the open pit or underground mine, then pumped to surface.

Coal Mining on the Highveld and its Implications for

2009-11-1  COAL MINING ON THE HIGHVELD AND ITS IMPLICATIONS FOR FUTURE WATER QUALITY IN THE VAAL RIVER SYSTEM . T S MCCARTHY and K PRETORIUS . INTRODUCTION . The history of coal mining in South Africa is closely linked with the economic development of the country. Commercial coal mining commenced in the eastern Cape near Molteno in 1864.

采矿专业英语词汇 豆丁网

2011-4-15  本文介绍了采矿专业常用英语词汇,并附有简易图标,形象生动,方便业内人士学习 geologicstructure 地质构造 geologic age ~term coalfield 煤田 take 井田 reserve take井田储量 geologic reserve coal exploration 煤层勘探explore sedimentary rock 沉积