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Computerized probabilistic stability analysis of coal refuse disposal facilities
Published in Y.J. Wang, R. Larry Grayson, Richard L. Sanford, Use of Computers in the Coal Industry, 2020
Coal refuse represents reject materials produced in the preparation and processing of coal after mining. As described by D’Appolonia Consulting Engineers, 1976, two types of refuse are produced at the preparation plant: coarse coal refuse and fine coal refuse, the dividing size between the two being the No. 28 sieve. Coarse coal refuse is a shale-like material, and is composed of roof and floor rock, rock materials incorporated in the coal seam, the coal itself, and the rock originating from shaft and slope cuts. Fine coal refuse is a sandy, silty (sometimes clayey) material that generally has a high coal content. It is produced and disposed in a slurry form and will thus have excessive amounts of moisture. Coarse coal refuse typically amounts to 75-80 percent by weight of the total refuse production; the remainder is fine refuse.
Recovering of fine coal particles from tailing ponds of TKİ Alpagut-Dodurga coal washing plant
Published in Gülhan Özbayoğlu, Çetin Hoşten, M. Ümit Atalay, Cahit Hiçyılmaz, A. İhsan Arol, Mineral Processing on the Verge of the 21st Century, 2017
A vast number of coal refuse ponds, which are considered to be environmentally harmful, include significant amount of fine coal particles. These cleanable fine coals generally exist in the refuse ponds due do the inability of conventional technologies to effectively separate the fine coal from the associated gangue particles (Kirnarsky 1998.
Treatment of smouldering coal refuse piles: an application in China
Published in Environmental Technology, 2020
Zhenlu Shao, Deming Wang, Kai Cao, Weibin Si, Yizhou Li, Jiaolong Liu
Coal refuse (also known as coal waste) is the inevitable by-product of coal mining, physical coal cleaning and coal preparation operations, which consists of low-quality coal mixed with rock, shale, slate, clay and other organic and inorganic material. Coal refuse is normally deposited and piled up across the landscape next to communities, rivers and sometimes fill entire valleys. The scale of coal refuse piles varies from a few to hundreds of acres in area and tens to hundreds of feet in height. Coal refuse piles (CRP) exist in almost all coal producing countries, especially in China, the largest coal producer in the world. In 2017, China produced 3.52 billion tons of coal, which accounts for 46.4% of the world’s coal production share [1]. Coal refuse is the largest solid waste in China and occupies 30% of total national industrial solid waste discharge. According to incomplete statistics, the total amount of coal refuse in China has exceeded 4.5 billion tons and is increasing at an annual rate of nearly 200 million tons. There are over 2,000 large-scale coal refuse piles across China, covering an area of more than 13,000 hectares, and is increasing at an annual rate of 400 hectares [2].
Evaluation of Pressure Filtration of Coal Refuse Slurry: A Fractional Factorial Design Approach
Published in International Journal of Coal Preparation and Utilization, 2019
Gireesh S.S. Raman, Mark S. Klima
Coal refuse slurry, one of the waste product streams in a coal preparation plant, is typically directed to a slurry impoundment after thickening. Potential environmental problems with coal refuse impoundments include sliding, dam failures, burning piles, acid water, siltation of streams and reservoirs, and land property devaluation [1]. The refuse slurry stream from a traditional thickener has about 20–30% solids (by weight). However, paste thickening technology has the potential to concentrate the slurry to as high as 56% [2]. Slurries with solids concentration upward of 20% can be viable candidates for pressure filtration. Pressure filtration has been traditionally used to dewater various mineral concentrates. Since the Martin County coal slurry spill in Kentucky in 2000, where the failure of the impoundment released about 300 million gallons of coal refuse slurry into the Big Sandy River, coal refuse management has gained more prominence in the United States [3]. Even though the installation of a filtration unit for the refuse stream might require a high investment, it is expected to pay back with decreased impoundment area requirements, reduced impoundment construction and maintenance costs, and lower water requirement of the plant. Thus, filtration of coal refuse has the potential to improve water conservation, minimize environmental impact, reduce area requirements for disposal, and provide a safer operation [4].