Impact of Humidity and Freeze–Thaw Cycles on the Disintegration Rate of Coal Gangue in Cold and Arid Regions: A Case Study from Inner Mongolia, China

IF 2.2 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Minerals Pub Date : 2024-09-05 DOI:10.3390/min14090911
Chuangang Gong, Liya Yang
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引用次数: 0

Abstract

Coal extraction in China is increasingly moving towards colder regions such as Xinjiang and Inner Mongolia. However, these mines face land restoration challenges due to a scarcity of fertile topsoil. This study explores the potential of coal gangue, a mining byproduct, as a viable substitute for topsoil. The study examines the effects of humidity fluctuations and freeze–thaw cycles, both individually and in combination, on the weathering disintegration of coal gangue. Coal gangue samples were subjected to controlled laboratory conditions simulating environmental factors. Fourteen interventions were analyzed, and the findings indicated that the combined application of humidity and freeze–thaw cycles significantly accelerated the disintegration process, outperforming the individual interventions. In addition, it was found that significant temperature variations caused the moisture and salts within the gangue to expand, which affected the rate of disintegration. The study showed that the rate of weathering disintegration was significantly higher in conditions of saturated humidity–freeze–thaw cycles compared to unsaturated humidity conditions. This highlights the essential role of ice crystals in accelerating the weathering process during temperature fluctuations. This study highlights the importance of humidity over temperature in the weathering and disintegration of coal gangue. It also suggests that freeze–thaw cycles can enhance this process. The study provides valuable insights for the management and utilization of coal gangue in cold and arid regions.
湿度和冻融循环对寒冷干旱地区煤矸石崩解率的影响:中国内蒙古案例研究
中国的煤炭开采正越来越多地向新疆和内蒙古等寒冷地区转移。然而,由于缺乏肥沃的表土,这些煤矿面临着土地恢复的挑战。本研究探讨了煤矸石这种采矿副产品作为表土替代品的潜力。研究探讨了湿度波动和冻融循环单独或共同对煤矸石风化分解的影响。煤矸石样本被置于模拟环境因素的受控实验室条件下。对 14 种干预措施进行了分析,结果表明,湿度和冻融循环的联合应用明显加快了分解过程,优于单独的干预措施。此外,研究还发现,温度的显著变化会导致煤矸石中的水分和盐分膨胀,从而影响瓦解速度。研究表明,与湿度不饱和的条件相比,在饱和湿度-冰冻-解冻循环条件下,风化解体的速度明显更高。这凸显了冰晶在温度波动期间加速风化过程的重要作用。这项研究强调了在煤矸石的风化和分解过程中,湿度比温度更重要。研究还表明,冻融循环可以促进这一过程。这项研究为寒冷和干旱地区煤矸石的管理和利用提供了宝贵的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Minerals
Minerals MINERALOGY-MINING & MINERAL PROCESSING
CiteScore
4.10
自引率
20.00%
发文量
1351
审稿时长
19.04 days
期刊介绍: Minerals (ISSN 2075-163X) is an international open access journal that covers the broad field of mineralogy, economic mineral resources, mineral exploration, innovative mining techniques and advances in mineral processing. It publishes reviews, regular research papers and short notes. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.
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