Large scale underground mining of coal resources in China using longwall mining has resulted in ecological and environment problems, including surface subsidence that is considered serious due to competing interests of prime agricultural lands, food security, and regional economic development. The subsided lands must be rehabilitated …
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The invention discloses a high-efficiency coal mine underground coal slurry water treatment system and a method, comprising a coal slurry water treatment system and a control system; the control system is a PLC system and is connected with the slime water treatment system through a network transmission medium. The whole slime water …
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A coal-based AMD treatment sludge was first characterized for a range of critical minerals, including REEs. Then, different separation techniques were employed to achieve the study goal. The main challenge of the study was identified as the low REE concentration and the high impurity concentration due to the nature of AMD.
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Zero Discharge Treatment Technology and Application of Mine Water in Coal Mines. Coal Science and Technology. 2017; 45 (11):205-210. DOI: …
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Polluted mine water draining from working or abandoned mines, commonly called acid mine drainage or metal leachate (AMD/ML), can cause environmental problems and therefore needs reliable treatment (Brown et al. 2002; Younger et al. 2002; Wolkersdorfer 2008).When active treatment is used, large amounts of sludge are …
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The diffusion characteristics of fine-grained gangue slurry are significant for gangue consumption and ecological environment protection, especially in underground mines. Therefore, based on the theory of porous medium transportation, this paper establishes a 3D caving zone model, proposes methods for reconstructing, statistical, …
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Other AMD control technologies include injection of alkaline materials (coal ashes and limestone products) into abandoned underground mines and into buried acid …
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Treatment evaluations were performed at four Pennsylvania hydrated lime treatment sites and one quicklime treatment site designed to remove ferrous iron from underground coal mine drainage. Two of the sites included a pretreatment decarbonation step to exsolve CO2(aq) and reduce hydrate consumption due to hydroxylation and …
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Underground coal mining has a strong disturbance on surrounding rock strata, causing inevitable water inflow into mined spaces, which seriously affects safety production. Mine water disaster is regarded as one of the most critical problems in coal mining and, thus, has been a research hotspot in coal mining. This review focuses on …
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Other AMD control technologies include injection of alkaline materials (coal ashes and limestone products) into abandoned underground mines and into buried acid material in mine backfills, remining of abandoned areas, and installation of alkaline recharge trenches. In the event AMD is formed, effluent treatment is required.
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Northwest China is arid and rainless, and coal mines produce large amounts of mine water during the mining process [1,2]. Mine water is discharged from the …
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The case of the Marchand mine near the town of Lowber is typical for underground coal mines in Pennsylvania. Coal production at the site was booming in the early 1900s until the mine closed within four decades. ... "We started collecting sludge from different passive treatment systems, analyzed it, and it turned out that it could be used …
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Acid Mine Drainage from underground coal mines and coal refuse piles is one of the most persistent industrial pollution problems in the United States. Pyrite in the coal and overlying strata, when exposed to air and water, oxidizes, producing ferrous ions and sulfuric acid. The ferrous ions are oxidized and produce an hydrated iron oxide …
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Neutralization is generally the first step in treating acid mine water (gold, operational and abandoned coal mines). In Gauteng a volume of 240 Mℓ/d of acid mine water from gold mining requires treatment. At an acidity of 3 g/ℓ (as CaCO 3 ), a lime (CaO) price of R360 and a purity of 93 % the neutralization cost would amount to R57 million/a.
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Fluence's innovative membrane aerated biofilm reactor (MABR), however, delivers a 90% aeration energy savings with passive aeration at atmospheric pressure, making domestic wastewater treatment at mining camps more sustainable. And, the process has exceptional nutrient removal due to simultaneous nitrification-denitrification.
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Veolia Water Technologies South Africa custom-builds mine water treatment systems to match the specific requirements of mining applications, whether mining for gold, nickel and copper mining, to uranium, coal, or other minerals. Water solutions have successfully helped mining companies across the globe to refine minerals, reduce waste, limit ...
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The earlier long coal slurry pipeline is the Black Mesa pipeline in the United States, built in 1970. The pipeline was able to transport 5 million tonnes of coal per annum using a 457 mm pipeline ...
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To realize the underground excavation gangue of the Huangling No. 2 coal mine without raising the ground, the slurry filling technology is proposed to transport the slurry made by gangue through ...
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The mine's owner, a producer of high-BTU bituminous coal in the United States, sought a solution for better sludge management at the mine site, located in the Eastern panhandle of West ia. A 2,000 …
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Coal sludge, also known as slurry, is the liquid coal waste produced by mining activities. After mining, coal is crushed and washed to remove the surrounding soil and rock. The washing process generates huge amounts of liquid waste, and the mining process itself produces millions of tons of solid waste. Coal companies usually dispose of …
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The treatment of mine drainage-impacted waters generates considerable amounts of sludge, which raises several concerns, such as storage and disposal, …
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Mining coal. Coal miners use large machines to remove coal from the earth. Many U.S. coal deposits, called coal beds or seams, are near the earth's surface, but others are deep underground.Modern mining methods allow U.S. coal miners to easily reach most of the nation's coal reserves and to produce about three times more coal in one hour than in …
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Underground Injections. An underground injection is a form of coal waste disposal whereby the coal sludge is mixed with water and pumped into abandoned underground mine workings. Once underground, the slurry can mix with water and migrate into nearby aquifers contaminating local water supplies with dangerous levels of …
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We constructed a mining soil restoration system combining plant, complex substrate and microbe. Sludge was added to reconstructed mine substrates (RMS) to …
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Underground mining requires lot of water pumping to surface which increases cost. Because of safety, support, ventilation and environment costs underground mines …
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Peiravi et al. (2017) used a cathode chamber under aerobic condition for bio-electrochemical treatment of AMD from abandoned coal mines. Mulopo (2015) used an alkaline barium calcium desalination process to treat AMD, and observed the sulfate reduction to very low levels and the recovery of barium carbonates. Active treatment is …
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Coal wastes: handling, pollution, impacts, and utilization. Soheil Jahandari, ... Maroun Rahme, in The Coal Handbook (Second Edition), 2023. 4.9.1 Waste rock or overburden. Coal mine waste rock (CMWR) generated in coal mining activities is one of the most significant sources of industrial solid waste. Nearly 4.5 billion tons of CMWR stockpiled in …
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The North Branch Potomac River Mine Pool Assessment study encompasses 12 underground coal mines that underlie the head waters of the North Branch of Potomac River Watershed and span across more than 25,000 acres in both Maryland and West ia. A combination of abandoned, active and inactive underground mines is located …
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Sludge Disposal. Four sludge disposal methods were observed: (1) deep mine disposal, (2) permanent retention in pond, (3) haulage to and disposal at a coal refuse area, and (4) onsite burial. Only one company expected to use this last method. Changing disposal methods was found to be common practice.
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Zero Discharge Treatment Technology and Application of Mine Water in Coal Mines. Coal Science and Technology. 2017; 45 (11):205-210. DOI: 10.13199/jki.cst.2017.11.034. Research status and ...
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