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 …

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 ...

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 ...

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 …

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 …

Coal is a black or brownish-black sedimentary rock that can be burned for fuel and used to generate electricity. It is composed mostly of carbon and hydrocarbons, which contain energy that can be released through combustion (burning). Coal is the largest source of energy for generating electricity in the world, and the most abundant fossil fuel ...

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 …

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 …

See more on eia.gov

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, …

Abstract. 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 matters are playing an increasingly important role in mine disaster and hazard control. To summarize the valuable work in …

In order to further study the failure mechanism of gas-containing coal and rock mass, samples were taken from the gas-containing coal seam in the Wuhushan Coal Mine of the Wuhai Mining area of China.

Another is the extracted coal mine methane during coal mining for safe production from the coal mine (Kędzior 2009; Moore 2012). The methane content is low with a volume fraction of 3–80%, and the other content is mainly carbon dioxide and air. Coal mine methane containing lots of air is called oxygen-bearing coal mine methane.

Two dominant methods account for the vast majority of underground coal mining: "room and pillar" and "longwall" mining. In room and pillar mining, seams of coal …

@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 …

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 …

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 …

When coal is mined, fresh sulfur-bearing minerals in the coal and rocks are exposed to air and water. Problematic mine drainage is given many names including …

Coal mining - Extraction, Processing, Pollution: In geologic terms, coal is a sedimentary rock containing a mixture of constituents, mostly of vegetal origin. Vegetal matter is …

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., …

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 …

The Philippines is largely a coal consuming country with coal having the highest contribution to the power generation mix at 58% in 2021. But, local demand for coal is not limited to power generation. In 2021, the cement industry utilized 6.66% of the country's coal supply, 7.08% went to other industries such as alcohol, sinter, rubber boots ...

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 ...

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

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 …

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 ...

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 ...

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 …

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 …

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 …

DOI: 10.1016/J.CONBUILDMAT.2018.09.158 Corpus ID: 139970701; Evaluation of chloride transport in blended cement mortars containing coal mining waste @article{CanedaMartnez2018EvaluationOC, title={Evaluation of chloride transport in blended cement mortars containing coal mining waste}, author={Laura Caneda …