Recycling of crushed waste rock as backfilling material in coal mine

Crushed waste rocks can be used as materials for backfilling goafs, so as to achieve the simultaneous goals of processing solid waste and controlling surface subsidence; however, particle size distribution directly affects the compaction of crushed waste rocks. ... 2 State Key Laboratory of Coal Resources and Safe Mining, School of Mines, China ...

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Global mining footprint mapped from high-resolution …

Their inclusion of areas that might be termed mine "lands" (areas wherein mining activity is the primary land use) situated between and surrounding mine "features" (e.g., pits, waste rock ...

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Digging deeper: Mining methods explained

The underground mining methods we use include room and pillar, narrow vein stoping and large-scale mechanised mining. Room and pillar mining is a style of mining where tunnels are driven in a chess board pattern …

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Sustainability | Free Full-Text | Coal Mine Solid Waste Backfill …

Fully mechanized backfill mining is a mining methodology that employs coal waste rock for goaf filling. The filling procedure adheres to the "one cut and one fill" …

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Coal waste: handling, pollution impacts and utilization

The main rock types in coal mine spoil are usually clayey rocks (clay-stone), mudstone and sandstone often with siderite inclusions. Individual rocks are characterized by different physical and chemical properties, which mainly determine their usability. Depending on where CS is obtained, and the percent share of individual rocks in the …

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Coal mine wastes recycling for coal recovery and eco …

The mining industry is globally criticized for generating large amount of solid wastes often with a potential environmental impact. This study presents a feasible approach of recovering residual coal from coal mine waste rocks (CMWR) and reusing the derived tailings to produce ecofriendly fired bricks.

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Probabilistic Slope Stability Analysis of Coal Mine Waste Rock …

Coal mine waste rock is generated during coal extraction and is usually disposed of in non-engineered dumps. The dumps are extended vertically to 100–120 m height to reduce the spatial footprint. The waste mass generally consists of loose, cohesionless material associated with high heterogeneity, so the dumps are prone to …

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Review The geochemistry and hydrology of coal waste rock …

The largest waste stream generated by coal mining is waste rock removed to access the coal seam(s). The limited processing required to produce saleable coal …

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Recycling of crushed waste rock as backfilling material in …

The compaction test used samples of crushed waste rocks (sandstone) that were directly collected from an underground coal mine and were then prepared in the …

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Waste management in the mining industry of metals ores, …

Waste from coal mining is managed, however only in 44%. Among the waste related to coal mining and processing, the following types of waste are distinguished: flotation, slag, bottom ash and fly ash.

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How the 1966 Aberfan Mine Disaster Became Elizabeth II's

Coal mining creates waste, and the waste rock was dumped in an area called a tip. Merthyr Vale had seven tips. By 1966, the seventh tip, which was begun in 1958, was about 111 feet high and ...

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The Potential Use of Waste Rock from Coal Mining for the

It is possible to use waste rock during coal mining in Dong Trieu and Quang Ninh areas as aggregates in concrete production. Waste rock samples had a …

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Waste management in the mining industry of metals ores, coal…

As a result of coal mining, a waste rock, in the case of coal constitute about 30% (Kopacz, 2015), and the rest of the generated waste are tailings containing gangue and large amounts of water, which is recycled in …

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Mining and Water Pollution

Waste from the Mining Process. Ore is mineralized rock containing a valued metal such as gold or copper, or other mineral substance such as coal. Open-pit mining involves the excavation of large quantities of waste rock (material not containing the target mineral) in order to extract the desired mineral ore.

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Recycling utilization patterns of coal mining waste in China

Fly-ash and coal gangue are the two main industrial solid waste in China. The chemical compositions (shown in Table 1) were SiO 2, Al 2 O 3, Fe 2 O 3 and some impurities. As the coal gangue is main solid waste for coal mining, one of the most common approaches to waste rock is to stack construction that encapsulate the most …

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Minerals | Free Full-Text | Mine Waste Rock: …

Waste Rock as Unique Class of Mine Waste. Mine waste rock and tailings are typically the two major waste types at mine sites, regardless of the mineral commodity (e.g., coal or base/precious …

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(PDF) The Potential Use of Waste Rock from Coal Mining …

Around 25 million tons of coal mine waste rock (CMWR) are stored in many places in Morocco due to coal mining activities. As a result, air and water quality of the neighborhood is polluted and ...

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Probabilistic Slope Stability Analysis of Coal Mine Waste Rock …

Coal mine waste rock is generated during coal extraction and is usually disposed of in non-engineered dumps. The dumps are extended vertically to 100–120 m height to reduce the spatial footprint.

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Mining waste

It includes materials such as topsoil overburden (which are removed to gain access to mineral resources), and waste rock and tailings (after the extraction of the valuable mineral). ... However, mining waste can also contain large quantities of dangerous substances, such as heavy metals. Extracting and processing metals and …

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The Challenges of Reusing Mining and Mineral-Processing …

Wastes produced during coal preparation (removal of undesired materials from coal through coal washing, crushing, screening, and dewatering) may reach 10 to …

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Applied Sciences | Free Full-Text | Effects of Loading Stress …

Coal mine waste rocks, mainly broken gangue, can be used as filling materials to backfill into goafs. Under the overburden load, the backfill body is vulnerable to compressive deformation and particle breakage. With the increase in mining depth, the overlying strata will impose different loads on waste rock filling materials at different …

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2.2 Types of Mining Wastes

Figure 3 – Waste rock from an open pit operation has a wide range in particle size, and significant variability from one location to the next within the stockpile.. Spent Heap leach. In heap leach mining operations, rock …

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Coal waste

Coal mining and coal combustion in power plants produce several types of wastes: The mining process itself produces waste coal or solid mining refuse, which is a mixture of coal and rock.; The mining process also produces liquid coal waste, which is then stored in impoundments.; Pollution control equipment used for coal combustion produces coal …

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The Challenges of Reusing Mining and Mineral-Processing …

Mining and mineral-processing wastes—the solid and liquid materials generated after mining and ore processing at or near mine sites ()—have no current economic use.A number of environmental problems are associated with the disposal of this waste, including contamination of streams and lakes and pronounced landscape …

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The Potential Use of Waste Rock from Coal Mining for the …

The recycling of waste rocks in coal mining for construction materials has been studied. It contributed to reducing environmental pollution, creating technical value, and economic benefits from waste rock [1,2,3]. The waste rock at coal mines is a technological waste formed during coal production.

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Review The geochemistry and hydrology of coal waste rock …

Comparing conventional and coal mine waste rock dump characteristics and hydrogeochemical processes. Waste rock is a major waste stream generated by both conventional base or precious metal mines and coal mines. It is commonly stored in dumps of varying sizes that are composed of heterogeneous mixtures of overburden, …

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Potential of coal mine waste rock for generating acid mine drainage

Waste rocks (WRs) from Lakhra coal mining area in Pakistan contain high concentrations of Sulphur (19 to 113 g/kg).. Acid mine drainage potential of WRs ranges from − 70 to − 492 kg CaCO 3 /tonne. Leachates from acidic WRs with pH 1–2.5 range in concentration of Fe, SO 4 2 −, and AL from mg/L to g/L and that of trace elements from …

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Reduction and utilization of coal mine waste rock in China: …

In China, coal mine waste rock (CMWR) produced in coal mining and processing is the greatest source of industrial solid waste in terms of production, accumulation volume, and occupied area. There are about 4.5 billion tons of CMWR stockpiled into more than 1700 waste dumps which occupied 150 km 2 of land ( Bian et …

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Rare earth elements could be pulled from coal waste

In Appalachia's coal country, researchers envision turning toxic waste into treasure. The pollution left behind by abandoned mines is an untapped source of rare earth elements.

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