Coal is a nonrenewable fossil fuel that is combusted and used to generate electricity. Mining techniques and combustion are both dangerous to miners and hazardous to the environment; however, coal accounts for about half of the electricity …

The mechanical properties of gas-containing coal and rock mass play important roles in controlling the occurrence and development of coal and gas outbursts. The gradual increase in mining depth will change the failure mechanism of gas-containing coal and rock mass. In order to further study the failure mechanism of gas-containing …

The disposal of coal mining waste is also a significant problem. The study was conducted to examine the usability of coal mining wastes as a brick building material. ... The wastes containing brick properties were compared with the waste-free standard brick properties. At all three firing temperatures, the water absorption, apparent porosity ...

Natural sand has been replaced with crushed sand from mine waste rock with a content of 0-30% (by volume); the results showed that concrete containing crushed sand from the mine achieved 15% higher compressive strength than concrete containing natural sand [11]. In addition, concrete using crushed sand from mine waste rock reduced …

A four foot coal bed is overlain by 75 feet of overburden: calculate overburden volume using an area of 1 yard long by 1 yard wide: 75 ft./3 ft. per yard = 25 yards depth volume = 25 …

Surface coal mining generally involves the following sequence of unit operations: (1) clearing the land of trees and vegetation, (2) removing and storing the top layers of the unconsolidated soil (topsoil), (3) drilling the …

The study evaluated the effects of arbuscular mycorrhizal fungi (AMF) on the growth and trace element phytoextracting capabilities of vetiver in a substrate containing coalmin … Arbuscular mycorrhizal fungi in the growth and extraction of trace elements by Chrysopogon zizanioides (vetiver) in a substrate containing coal mine wastes

1. Introduction. Coal is the basic energy source in China, and deep resources have gradually become important factors leading to national energy security (Pan et al., 2022).According to statistics, there are 47 coal mines that mining depth over 1000 m in China, and the maximum depth has reached 1500 m (Zhao et al., 2020).However, the …

The control and utilization of coalbed methane (CBM) are crucial for ensuring the safety of coal mining operations and mitigating greenhouse gas emissions. Predrainage of CBM from boreholes plays a pivotal role in preventing CBM accidents, harnessing CBM energy resources, and reducing greenhouse gas emissions. To better understand the evolution …

the influence of mining. The test gas-containing coal samples in this paper were taken from the raw coal of No.9 coal seam of Wuhushan Coal Mine of Wuhai Mining area of China. Wuhushan Coal

Mechanical properties and durability of concrete containing coal mine waste rock, F-class fly ash, and nano-silica for sustainable development May 2023 DOI: 10.1016/j.jer.2023.100097

By analyzing the AE signals of gas-containing coal-rock masses and inverting the internal mechanical behavior of gas-containing coal, the damage and destruction mechanisms are explored, which is of great significance to improve the prediction accuracy of coal and gas outburst and the safe production of mines (Liu et al., …

The prediction of time to slope failure (TOF) is one of the most pivotal concerns for both geological risk researchers and practitioners. Conventional inverse velocity method (IVM), based on the analysis of displacement monitoring data, has become an effective method to solve this problem because it is easy to perform and the prediction …

Coal and gas outburst is a type of coal mine dynamic disaster with complex causes and serious consequences. In China, the number and scale of outburst disasters are among the highest in the world. It is an inevitable stage for outburst that the mechanical instability of the combination of intact coal and tectonic coal (CICTC) in strata. The dip …

Safe mining is the premise and guarantee of sustainable development of coal energy. Due to the combination of excellent properties of polymers and traditional soft matters, polymer-containing soft ...

Coal mining is the process of extracting a coal reserve from the ground. As a commodity, coal is valued for its energy content and since the nineteenth century has been widely used to generate electricity and as a fuel source for the steel and cement industries. ... White damp: air containing carbon monoxide which is toxic, even at low ...

Coal mining destroys underground aquifers and produce a series of solid, liquid and gas pollutants such as coal gangue, acid mine drainage (AMD) and greenhouse gases [].AMD has low pH value, a high concentration of heavy metal ions and sulfate, and its pollution to the mine environment is one of the common problems in the world …

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WEBCoal mining Mining operations can negatively impact water supplies, often with long-lasting effects. The fundamental issue involves contamination of nearby rivers, lakes, and aquifers by what comes out of …

Our open database on global coal and metal mine production 12 covers worldwide mining activities of metal ores and coal, on an individual mine level. It comprises 1171 mines, production data for ...

2. Determinations of strata failure for mining under surface- and groundwater2.1.. In situ borehole observation of strata failureChina has developed some specific methods of coal mining and experimental techniques under aquifers and surface water [2].Over the last 40 years, about 1000 long-wall faces were extracted under …

Breathing excessive anounts of respirable coal mine dust containing quartz particles can cause either black lung disease or silicosis, both of which are disabling and some-times fatal. The level of. quartz dust and coal dust in the mine air and the length of time the miner is exposed to this environment will determine how quickly lung disease ...

self-contained self-rescuer. thick-seam mining. shortwall method. longwall method. (Show more) Recent News. Apr. 1, 2024, 11:18 PM ET (The Guardian) Labor's proposed changes to water trigger laws …

Coal Mining and Processing. A lthough the United States has the vast coal resource described in the previous chapter, perhaps as much as 4 trillion tons, the key issue for policy makers is the amount of coal that is …

Coal mining can pose safety risks as mining stress and adsorption-desorption damage the coal in front of the working face. To address this, a damage model under the coupled influence of mining stress and adsorption-desorption was proposed by incorporating statistical damage mechanics and the effective stress principle. The …

Environmental Impacts. Acid mine drainage (AMD) refers to the outflow of acidic water from coal mines or metal mines, often abandoned mines where ore- or coal mining activities have exposed rocks containing the sulphur-bearing mineral pyrite. Pyrite reacts with air and water to form sulphuric acid and dissolved iron, and as water washes through mines, …

Gardiner and Melchers 2-3 have published several studies on corrosion from coal in bulk carriers, as have Waanders and Vorster. 4 Zhang, et al. 5 evaluated corrosion of coal mine equipment in coal …

Abandoned mine drainage is water that is polluted from contact with mining activity, and normally associated with coal mining. It is a common form of water pollution in areas where mining took place in the past. There are several issues with abandoned mines that impact water quality: Stream impacted by acid mine drainage from a Mid-Atlantic ...

@article{Foghi2024EarlyAH, title={Early age hydration behaviour of concrete containing a coal mining waste: novel experimental procedures and effects of capillary pressure}, author={Esegbushota Josephine Foghi and Thanh Vo and Mohammad Rezania and Mohaddeseh Mousavi Nezhad and Liberato Ferrara}, journal={Construction and …

The estimated sources of total arsenic exposure in this area are from arsenic-contaminated food (50-80%), air (10-20%), water (1-5%), and direct contact in coal-mining workers (1%). At least 3,000 patients with arsenic poisoning were found in the Southwest Prefecture of Guizhou, and approximately 200,000 people are at risk for such overexposures.

Acid mine drainage (AMD) refers to the outflow of acidic water from coal or metal mines, often abandoned ones where ore- or coal mining activities have exposed rocks containing the sulphur-bearing mineral pyrite. Pyrite reacts with air and water to form sulphuric acid and dissolved iron, and as water washes through mines, this compound …