Effects of thin Covers on the Release of Coal Gangue Contaminants

Fu, Tianling; Wu, Yali; Ou, Lisha; Yang, Guang; Liang, Tianchang

doi:10.1016/j.egypro.2012.01.054

Cited by 21 publications

(8 citation statements)

References 6 publications

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“…Reactions of these minerals with H + consume H + thereby increasing the pH values of the associated solutions 28,29 . These reactions include the following: In Figure 7a, the pH values initially increase and then stabilize, which indicates that reactions between soluble minerals in coal and acidic solutions attain equilibria involving significant buffering phases [30][31][32] . In addition, changes in the pH-4 and pH-5 solutions are pronounced relative to those for the pH-2 and pH-3 solutions.…”

Section: The Change Of the Ph Value Of The Solutionmentioning

confidence: 98%

Characteristics of Pores in Coals Samples Exposedto Acid Mine Drainage

Tang

Luo

Zheng

et al. 2021

Preprint

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Acid mine drainage commonly occupies some pore space after underground coal mining, and this severely depreciates coal pillars, thereby posing a significant risk to mine stability. Considering that such depreciation is reflected in the microstructures of these pillars, in the present study, we propose a static immersion method suitable for coal seam samples immersion in the laboratory. We immersed the No. 2-2 coal seam samples from the Ningtiao Tower Coal Mine in Yulin, Shaanxi Province, in different acid mine drainage solutions and monitored the pH, oxidation–reduction potential (ORP), electrical conductivity (EC), total dissolved solids (TDS) among other water quality parameters for 300 h. After the immersion tests, samples were examined using scanning electron microscopy (SEM). The pH, ORP, EC, and TDS of the prepared acid mine drainage solutions increased significantly as the immersion time increased. Changes in water quality parameters are attributed to the absorption of hydrogen ions by insoluble clay minerals in the coal, which reduced the acidity, increased the pH value, and enhanced the electrical conductivity of the acid mine drainage solutions. SEM analysis reveals differences in the pore characteristics of (pore throat size and orientation) of the coal samples, and these are caused by erosive effects of the acid mine drainage solutions. Pores with throat sizes greater than 10 µm increased by 95% as the pH of the acid mine drainage solutions decreased, while the dominant pore orientation (60–90°) decreased to the 0–30° or increased to the 150–180° range, thereby increasing their randomness.

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Section: The Change Of the Ph Value Of The Solutionmentioning

confidence: 98%

Characteristics of Pores in Coals Samples Exposedto Acid Mine Drainage

Tang

Luo

Zheng

et al. 2021

Preprint

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“…Coal industry waste, particularly wastes from coal preparation (washing), is a continuing environmental issue for coal producing areas in China. Coal preparation solid wastes are currently one of the largest industrial hazards in China in terms of land area and accumulation, which amplifies the environmental hazards associated with the wastes (Fu et al 2012;Zhou et al 2014;Li et al 2015;Liang et al 2016;Zhao and Luo 2017). To mitigate the accumulation of coal preparation waste, remedies development has primarily focused on beneficial reuse of the material, which includes uses in construction materials, zeolites, activated carbons, and a variety of sorbents (Li et al 2006;Yan et al 2010;Zhou et al 2014;Gao et al 2015); however, these uses have not been developed to a level where the demand utilizes any significant quantities of coal preparation waste.…”

Section: Introductionmentioning

confidence: 99%

Facultative-anaerobic microbial digestion of coal preparation waste and use of effluent solids to enhance plant growth in a sandy soil

Fallgren

Chen

Peng³

et al. 2020

Int J Coal Sci Technol

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Coal preparation solid waste, which is a major environmental issue for coal-producing areas in China, may be microbiologically digested and transformed into a product suitable as a soil amendment to increase soil organic matter content and prevent and enhance plant/crop growth. Coal preparation waste collected from a coal sorting plant in Inner Mongolia, China was digested in bioreactors inoculated with microbial enrichments prepared from activated sludge and cow manure. The effluent solids from the coal preparation waste bioreactors were analyzed for their suitability as organic soil amendments, which complied with China standards. Plant growth tests were conducted in sandy soil from a semi-arid region in Colorado, which was amended with the effluent solids. Kentucky bluegrass (Poa pratensis L.) and chives (Allium schoenoprasum) were used as the representative plants for the growth tests, where results indicated substantially higher yields of Kentucky bluegrass and chives for the sandy soils amended with the effluent solids when compared to a commercial organic fertilizer. The number and average length of Kentucky bluegrass shoots were 10 and 5.1 times higher, respectively, in soils amended with the effluent solids. Similarly, the number and average length of chives shoots were 10 and 1.7 times higher, respectively, in soils amended with the effluent solids. Overall, the microbial digestion of coal preparation waste for application as an organic soil amendment is a viable alternative and beneficial use of coal preparation solid waste.

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“…Nowadays, with an ever growing of coalmine industry, 3.8 billion tons' coal gangue was reported in 2014 in China with an increasing rate of 0.2 billion tons per year; it has been recognized as one of the main hazardous industrial emissions [14]. Many efforts have been made to develop facile and effective routes to extend the coal gangue applications; however, the utilization of such waste is still staying lower than 15% [15], and the main applications are limited in typical building materials, for example, concrete filling materials and composite cements [16]; therefore, the overall development of the coal gangue is narrow, and the efficient approach and potential application field studies are of great importance for the resource recovery of waste coal gangue.…”

Section: Introductionmentioning

confidence: 99%

A Novel Environmental Route to Ambient Pressure Dried Thermal Insulating Silica Aerogel via Recycled Coal Gangue

Zhu

Zheng

Zhao³

et al. 2016

Advances in Materials Science and Engineering

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Coal gangue, one of the main hazardous emissions of purifying coal from coalmine industry, is rich in silica and alumina. However, the recycling of the waste is normally restricted by less efficient techniques and low attractive output; the utilization of such waste is still staying lower than 15%. In this work, the silica aerogel materials were synthesized by using a precursor extracted from recycled silicon-rich coal gangue, followed by a single-step surface silylation and ambient pressure drying. A low density (~0.19 g/cm3) nanostructured aerogel with a 3D open porous microstructure and high surface area (~690 m2/g) was synthesized, which presents a superior thermal insulation performance (~26.5 mW·m−1·K−1of a plane packed of 4-5 mm granules which was confirmed by transient hot-wire method). This study offers a new facile route to the synthesis of insulating aerogel material by recycling solid waste coal gangue and presents a potential cost reduction of industrial production of silica aerogels.

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Effects of thin Covers on the Release of Coal Gangue Contaminants

Cited by 21 publications

References 6 publications

Characteristics of Pores in Coals Samples Exposedto Acid Mine Drainage

Characteristics of Pores in Coals Samples Exposedto Acid Mine Drainage

Facultative-anaerobic microbial digestion of coal preparation waste and use of effluent solids to enhance plant growth in a sandy soil

A Novel Environmental Route to Ambient Pressure Dried Thermal Insulating Silica Aerogel via Recycled Coal Gangue

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