微波加热时间和功率对固结尾矿回填土力学性能的影响研究

IF 2.2 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Minerals Pub Date : 2024-09-15 DOI:10.3390/min14090944
Pengchu Ding, Shiheng Yan, Qinqiang Guo, Liwu Chang, Zhen Li, Changtai Zhou, Dong Han, Jie Yang
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引用次数: 0

摘要

随着采矿工程对先进和生态友好型处理技术的需求不断增长,微波加热技术在水泥尾矿回填(CTB)处理中的潜在应用也在显著扩大。本研究全面探讨了微波辐照时间和功率对不同浓度和水泥与砂比的水泥尾矿回填的力学性能的影响机制。目的是通过实验方法揭示其影响规律,为优化 CTB 处理工艺提供科学依据。本文对 CTB 进行了微波加热试验、单轴压缩试验和 SEM-EDS 试验。研究结果表明,加热时间和功率可显著提高 CTB 的早期强度,对浓度较高、水泥-砂比较大的 CTB 效果更明显。当加热时间为 7 分钟、加热功率为 340 W 时,水泥水化反应得到最大程度的促进,从而提高了 CTB 的密度和强度增长速度。但是,过长的加热时间或过高的加热功率可能会导致 CTB 内部出现微裂缝或热应力集中,从而对 CTB 的强度增长产生不利影响。最佳的热暴露持续时间和微波功率设置可促进胶凝材料的活化和硅酸钙-水合物(C-S-H)相的成核,从而加速胶结尾矿回填(CTB)抗压强度的演变。这项研究的成果为在地下矿山回填中采用微波加热方法提供了宝贵的见解,这对于提高采矿作业的经济可行性和环境可持续性至关重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Study on the Effects of Microwave Heating Time and Power on the Mechanical Properties of Cemented Tailings Backfill
With the escalating demand for advanced and eco-friendly processing technologies in mining engineering, the potential applications of microwave heating technology in the treatment of cement tailings backfill (CTB) are expanding significantly. This research comprehensively investigates the mechanisms through which microwave irradiation duration and power influence the mechanical properties of CTB with varying concentrations and cement-to-sand ratios. The aim is to reveal the influencing patterns through experimental methods, providing scientific evidence for optimizing CTB treatment processes. This paper conducted microwave heating tests, uniaxial compression tests, and SEM-EDS tests on CTB. The research results indicate that heating time and power significantly enhance the early strength of CTB, with a more pronounced effect on CTB with higher concentrations and higher cement–sand ratios. When the heating time is 7 min and the heating power is 340 W, the cement hydration reaction is maximally promoted, thereby increasing the density and strength growth rate of CTB. However, excessively long heating time or overly high heating power may cause microcracks or thermal stress concentration within the CTB, adversely affecting the strength growth rate of CTB. Optimal thermal exposure duration and microwave power settings facilitate the activation of cementitious materials and the nucleation of calcium-silicate-hydrate (C-S-H) phases, thereby accelerating the compressive strength evolution of cemented tailings backfill (CTB). The outcomes of this research offer valuable insights into the deployment of microwave heating methodologies in underground mine backfilling, which are pivotal for augmenting the economic viability and environmental sustainability of mining operations.
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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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