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Minerals
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Advances in Mine Backfilling Technology and Materials
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Advances in Mine Backfilling Technology and Materials

A special issue of Minerals (ISSN 2075-163X).

Deadline for manuscript submissions: 31 December 2024 | Viewed by 1952

Special Issue Editors

Prof. Dr. Yuye Tan

E-Mail Website
Guest Editor
School of Civil and Resources Engineering, University of Science and Technology, Beijing 100083, China
Interests: backfill mining; cemented tailings backfill materials; mechanical behavior of cemented tailings backfill; hydration process and characteristic of cemented tailings backfill slurry
Dr. Xun Chen

E-Mail Website
Guest Editor
School of Resources and Environmental Engineering, Shandong University of Technology, Zibo 255000, China
Interests: cemented tailings backfill; solid waste filling material; solution mining
Dr. Yuan Li

E-Mail Website
Guest Editor
Department of Mining Engineering, College of Science, University of Utah, Salt Lake City, UT, USA
Interests: tailings dewatering; tailings material characterization; tailings backfill; management of tailings storage facilities

Special Issue Information

Dear Colleagues,

Backfill mining technology can be used to manage mine waste and reduce ground subsidence. It has become the preferred choice and is widely used in underground mining for its efficient, ecological, and environmentally friendly properties, and its ability for mining environment reconstruction. In the past few decades, many studies have been carried out on the backfilling mining method, backfilling technology, backfilling material development, and backfilling slurry and body performance. A number of achievements have been made, and this has promoted the development and application of backfilling mining in underground mines. This Special Issue invites research and review articles on backfilling technology and materials across research fields which may include (but are not limited to) the following:

  1. Advances in backfill mining method, theory and technology;
  2. Advances in backfill materials;
  3. Mechanical and rheological performance of backfill materials;
  4. Advances in mathematical modeling, numerical simulation, and in situ measurement methods of backfill materials.

Prof. Dr. Yuye Tan
Dr. Xun Chen
Dr. Yuan Li
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Minerals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • backfill mining method
  • cemented tailing backfill technology
  • filling materials
  • mine waste
  • binding material
  • cemented tailing backfill
  • mechanical properties of cemented tailing backfill
  • rheological properties of filling slurry
  • mathematical modeling
  • numerical simulation
  • in situ measurement

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Published Papers (3 papers)

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Research

21 pages, 2146 KiB  
Article
Optimization Model for Mine Backfill Scheduling Under Multi-Resource Constraints
by Yuhang Liu, Guoqing Li, Jie Hou, Chunchao Fan, Chuan Tong and Panzhi Wang
Minerals 2024, 14(12), 1183; https://doi.org/10.3390/min14121183 - 21 Nov 2024
Viewed by 220
Abstract
Addressing the resource constraints, such as manpower and equipment, faced by mine backfilling operations, this study proposed an optimization model for backfill scheduling based on the Resource-Constrained Project Scheduling Problem (RCPSP). The model considered backfilling’s multi-process, multi-task, and multi-resource characteristics, aiming to minimize [...] Read more.
Addressing the resource constraints, such as manpower and equipment, faced by mine backfilling operations, this study proposed an optimization model for backfill scheduling based on the Resource-Constrained Project Scheduling Problem (RCPSP). The model considered backfilling’s multi-process, multi-task, and multi-resource characteristics, aiming to minimize total delay time. Constraints included operational limits, resource requirements, and availability. The goal was to determine optimal resource configurations for each stope’s backfilling steps. A heuristic genetic algorithm (GA) was employed for solution. To handle equipment unavailability, a new encoding/decoding algorithm ensured resource availability and continuous operations. Case verification using real mine data highlights the advantages of the model, showing a 20.6% decrease in completion time, an 8 percentage point improvement in resource utilization, and a 47.4% reduction in overall backfilling delay time compared to traditional methods. This work provides a reference for backfilling scheduling in similar mines and promotes intelligent mining practices. Full article
(This article belongs to the Special Issue Advances in Mine Backfilling Technology and Materials)
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18 pages, 4558 KiB  
Article
Mechanical Properties, Failure Modes, and Damage Development of Stratified Cemented Tailings Backfill under Uniaxial Compression
by Wenbin Xu, Yalun Zhang, Wei Chen, Tong Sun and Yilin Sang
Minerals 2024, 14(9), 917; https://doi.org/10.3390/min14090917 - 6 Sep 2024
Viewed by 546
Abstract
Layered cemented filling leads to a layered composite structure of cemented tailings backfill (CTB) composed of high-strength top and bottom layers, as well as a low-strength middle layer. To solve the problem of the low mechanical properties of the middle layer caused by [...] Read more.
Layered cemented filling leads to a layered composite structure of cemented tailings backfill (CTB) composed of high-strength top and bottom layers, as well as a low-strength middle layer. To solve the problem of the low mechanical properties of the middle layer caused by layered filling, this study proposes the concept of an enhance layer, that is, an enhance layer is added to the middle weak layer to improve its overall mechanical properties. To explore the characteristics of strength, failure modes, energy dissipation, and progressive damage of stratified cemented tailings backfill (SCTB) with varying layered structures, the uniaxial compressive tests of SCTB specimens with enhance layers c/t of 1:15, 1:10, and 1:6, as well as height proportions of 0.1, 0.2, and 0.3, are examined. The results show that the elastic modulus and uniaxial compressive strength (UCS) of SCTB samples increase with the height ratio and cement-to-tailings ratio of the enhance layer. The elastic modulus and strength of SCTB specimens is more sensitive to the height ratio of the enhance layer than the c/t ratio. Moreover, the SCTB specimens mainly manifested as tensile failure of the upper layer and lower layer, but they did not penetrate the entire specimen. The propagation of cracks is limited by the addition of the enhance layer. The SCTB specimens have stronger plastic deformation ability, and a large part of the all-strain energy is dissipated in the shape of plastic failure. In addition, a constitutive model for damage in SCTB samples has been developed. The SCTB samples with a reasonable structure can also achieve sufficient strength compared to directly increasing the c/t ratio of CTB specimens while reducing the cost of cemented tailings backfill preparation. This approach reduces the carbon footprint of the mining industry and improved the overall mechanical properties and stability of the stratified cemented tailings backfill. This study provides a new approach for high-stage subsequent stope backfilling. The findings will offer guidance for the design of a layered filling mining method. Full article
(This article belongs to the Special Issue Advances in Mine Backfilling Technology and Materials)
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18 pages, 4565 KiB  
Article
Curing Agent for High-Concentration Unclassified Tailings Stockpiling: A Case Study of Tailings from a Gold Mine
by Weixiang Wang, Kun Li, Lijie Guo, Sha Wang, Yifan Chu and Yao Lu
Minerals 2024, 14(9), 884; https://doi.org/10.3390/min14090884 - 29 Aug 2024
Viewed by 602
Abstract
The disposal of tailings has always been a focal point in the mining industry. Semi-dry tailings stockpiling, specifically high-concentration tailings stockpiling, has emerged as a potential solution. To enhance the stability of tailings stockpiling and minimize its costs, the incorporation of a low-cost [...] Read more.
The disposal of tailings has always been a focal point in the mining industry. Semi-dry tailings stockpiling, specifically high-concentration tailings stockpiling, has emerged as a potential solution. To enhance the stability of tailings stockpiling and minimize its costs, the incorporation of a low-cost curing agent into high-concentration tailings is essential. Therefore, this study focuses on the development of a curing agent for high-concentration unclassified tailings stockpiling. The composition of a low-cost curing agent system is determined based on theoretical analysis, and the curing reaction mechanisms of each composition are researched. Subsequently, an orthogonal experiment is designed, and the strength of the modified unclassified tailings solidified samples at different curing ages is measured. Furthermore, the rheological properties of the modified unclassified tailings slurries are tested, and the feasibility of industrial transportation of the unclassified tailings slurries modified with the optimized curing agent is analyzed. Lastly, the microscopic morphologies of each material and the modified unclassified tailings solidified samples are characterized, their chemical compositions are tested, and the action mechanism of the curing agent in the curing system is further investigated. The results show that the optimal proportions of each material in the curing agent are as follows: slag, 58%; quicklime, 15%; cement, 8%; gypsum, 9%; and bentonite, 10%. The dominance of industrial waste slag exceeding 50% reflects the low-cost nature of the curing agent. Under this condition, the modified unclassified tailings slurry with a mass concentration of 75% exhibited a yield stress of 43.62 Pa and a viscosity coefficient of 0.67 Pa·s, which is suitable for pipeline transportation. These findings lay a foundation for subsequent decisions regarding stockpiling processes and equipment selection. Full article
(This article belongs to the Special Issue Advances in Mine Backfilling Technology and Materials)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: Study on dynamic characteristics and constitutive equation of stratified cemented tailings backfill
Authors: Yuye Tan
Affiliation: University of Science and Technology Beijing

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