Int. Journal of Mining Science and Technology (采矿与安全工程) | SinoTechIntel Research Archive

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Vol. 32 • 1 Vol. 32 • 2 Vol. 32 • 3 36 • Issue 1

Published Research PapersFiltered: Year 2026 • Vol. 32 • 2

Showing 6 of 147 peer-reviewed papers with full Graphical Abstracts.

Original ResearchVol. 32, Issue 2 • pp. 100-112DOI: 10.1016/j.ijmst.2026.02.008• Jan 15, 2026

Tensile-Shear Collaborative Fracturing in Hard Rock Induced by a Controllable Free Surface: Mechanism and Application

Authors: Chenliang Hao, Longjun Dong, Fangzhen Fan, Xuewei Li, Ju Ma, Yihan Zhang

In deep hard rock mining, high confining pressure inhibits tensile failure, leading to low efficiency and severe tool wear in conventional mechanical rock breaking methods. To solve this problem, we propose a Controllable Free Surface Induced Tensile-Shear Collaborative Fracturing (CFS-TSCF) method. The method pre-forms an engineered controllable free surface (CFS) to reconfigure the local stress field, enabling a specialized device (FIPFD) to apply directional tensile-shear loads for low-energy breaking. A multi-scale approach integrating lab AE tests, DEM simulations, and field verification investigated the fracture mechanism and performance. Results revealed a predominantly tensile-driven (>50%) process. The CFS transforms the rock's triaxial compression into a specific stress path. This path, dominated by directional tension and constrained by lateral compression, guides the fracture along a low-energy channel. This also dictates the micro-mechanism's evolution from central quasi-tensile to peripheral tensile-shear failure. Field trials in hard rock (>200 MPa UCS) validated the method, demonstrating controllable, blocky spalling and achieving an average mining efficiency of 52.03 t/h. This research validates the CFS-TSCF method, offering a new technical paradigm for safe, efficient, continuous hard rock mining.

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Tensile-Shear Collaborative Fracturing in Hard Rock Induced by a Controllable Free Surface: Mechanism and Application

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Original ResearchVol. 32, Issue 2 • pp. 100-112DOI: 10.1016/j.ijmst.2026.02.006• Jan 15, 2026

NaNO2-loaded mesoporous MgO for high-efficiency CO2 capture: Synthesis, characterization and novel mechanistic insights

Authors: Yulian Wang, Jiayi Liu, Jinze Song, Junze Gu, Binyan Wang, Rui Guan, Keqing Li, Wanzhong Yin, Haoran Sun, Huili Han

The development of efficient CO2 adsorbents is critical for achieving net-zero targets. MgO represents a promising solid adsorbent for CO2 capture, yet its limited specific surface area and insufficient active sites restrict its adsorption capacity under moderate temperature conditions. A rod-like anhydrous MgCO3 precursor was hydrothermally synthesized and calcined at 500 °C for 3 h to obtain porous MgO (184.9 m2 g−1, 0.38 cm3/g), which was then modified with 20% NaNO2 (by mole) via impregnation. This adsorbent achieved an adsorption capacity of 12.6 mmol g−1 after 120 min under a pure CO2 atmosphere at 325 °C. Comprehensive characterization reveals that NaNO2 modification leads to the NaNO3 and Na2CO3 formation on the MgO surface during calcination. The introduced NaNO3 effectively promotes oxygen vacancy formation, while the generated Na2CO3 serves as heterogeneous nucleation sites, collectively reducing the reaction energy barrier and enhancing interfacial mass transfer. This synergistic effect facilitates the MgCO3 formation followed by its conversion to the thermodynamically more stable Na2Mg(CO3)2. Kinetic studies elucidate that adsorption is dominated by surface chemical reactions and diffusion mechanisms at different stages. These fundamental insights into the adsorption mechanisms of nitrite-modified MgO provide valuable guidance for the rational design of advanced MgO-based CO2 adsorbents with enhanced performance.

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NaNO2-loaded mesoporous MgO for high-efficiency CO2 capture: Synthesis, characterization and novel mechanistic insights

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Original ResearchVol. 32, Issue 2 • pp. 100-112DOI: 10.1016/j.ijmst.2026.02.003• Jan 15, 2026

Unravelling the pH-Driven Multiscale Cascade of Hematite Flocculation: From Interfacial Tuning to Structural Assembly and Sedimentation Dynamics

Authors: ZHANG Ke Kang, SHEN Yan Bai, CUI Bao Yu, GAO Shu Ling, LIU Wen Gang, ZHAO Qiang

Efficient flocculation and sedimentation of ultrafine hematite remain a key challenge in mineral processing. This study elucidates the pH-dependent flocculation behaviour of hematite with anionic polyacrylamide (APAM) using a multi-scale correlation framework integrating interfacial analysis, structural characterization, and sedimentation evaluation. Increasing pH induces progressive surface deprotonation, yielding a more negative hematite surface and enhanced APAM adsorption from 0.106 to 0.186 mg/m2. FTIR, XPS, and molecular dynamics simulations consistently reveal strengthened Fe–OOC coordination, intensified hydrogen bonding, and more stabilised polymer conformations under alkaline conditions. Microscopy, SEM, and FBRM show that alkaline conditions facilitate the formation of larger and denser flocs, with size increasing from 56 to 982 μm and fractal dimension from 1.44 to 1.87. These structural changes markedly improve sedimentation performance, reducing turbidity from 436.8 to 76.7 NTU and increasing settled solids from 35.94 to 52.43 percent. The proposed multi-scale correlation model quantitatively links interfacial chemistry, floc structural evolution, and settling behaviour, providing a unified mechanistic basis for pH-regulated hematite flocculation. This framework not only advances understanding of polymer–mineral interactions but also offers practical guidance for optimising solid–liquid separation and tailings-water recycling in fine mineral beneficiation.

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Unravelling the pH-Driven Multiscale Cascade of Hematite Flocculation: From Interfacial Tuning to Structural Assembly and Sedimentation Dynamics

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Original ResearchVol. 32, Issue 2 • pp. 100-112DOI: 10.1016/j.ijmst.2026.02.007• Jan 15, 2026

Consolidation-Sealing of In-Situ Internal Stress in Deep Rocks: Device Development and Mechanical Behavior Characterization

Authors: Mingzhong Gao, Chuo Zhang, Fei Li, Bengao Yang, Jing Xie, Zundong Yang, Kunchen He

Addressing the scientific problem of unclear understanding of in-situ internal stress and its evolution in deep rock masses, a scientific definition and implementation path for the concept of in-situ internal stress consolidation-sealing in deep rock masses are proposed, and a set of in-situ internal stress consolidation-sealing test device for deep rock masses has been independently developed. The device consists of a material consolidation cultivation module, an in-situ internal stress environment simulation module, and a multi-source information capture module. And the three mechanical tests of internal stress preservation, internal stress release and conventional were carried out with the device. The evolution law of the deformation parameters in the internal stress consolidation-sealing stage was studied, and the difference characteristics of the deformation parameters before and after the internal stress releasing were compared and analyzed. The results show that the internal stress consolidation-sealing significantly affects the mechanical properties of the simulated rock material, while the internal stress release leads to the damage of the material properties, suggesting that the presence and influence of internal stress should not be overlooked. This study could provide a new research direction and scientific devices for the expansion and deepening of the field of deep in-situ rock mechanics.

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Consolidation-Sealing of In-Situ Internal Stress in Deep Rocks: Device Development and Mechanical Behavior Characterization

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Original ResearchVol. 32, Issue 2 • pp. 100-112DOI: 10.1016/j.ijmst.2026.02.001• Jan 15, 2026

Estimation of characteristic stresses in granite through acoustic emission monitoring of microcrack fracture mode evolution

Authors: Yunge Zhao, Linqi Huang, Longjun Dong, Xibing Li

Characteristic stresses are critical indicators for microcrack initiation and propagation in rock, a process intrinsically linked to fracture mode. To investigate fracture mode evolution and its feasibility for estimating characteristic stresses, this study conducted uniaxial compression and cyclic loading-unloading tests on fine- and coarse-grained granite with acoustic emission (AE) monitoring. Cyclic target stresses were set within intervals determined by characteristic stresses. Analysis using the AE parameters AF-RA revealed that fracture mode evolution correlates with damage level, and shear microcrack propagation primarily governs macroscopic failure. A characteristic stress estimation method was developed by mapping key points on the shear crack proportion curve: crack closure stress (transition between fluctuating and stable segments), crack initiation stress (inflection point of curve rise), and crack damage stress (slope change point in ascending segment). Comparative analysis with the crack volumetric strain method validated the proposed method. The influences of fracture mode dividing line and statistical interval were discussed, with practical recommendations provided. Compared to conventional AE parameters, the fracture mode proportion exhibits lower sensitivity to AE parameter variations, enabling more reliable identification of characteristic stress points. Furthermore, it directly reflects microcrack evolution behavior, enhancing interpretability and providing a novel perspective for AE-based characteristic stress determination.

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$Estimation of characteristic stresses in granite through acoustic emission monitoring of microcrack fracture mode evolution$

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Original ResearchVol. 32, Issue 2 • pp. 100-112DOI: 10.1016/j.ijmst.2026.02.004• Jan 15, 2026

Heating Rate Effect of Thermal Expansion in Granite and Implications for Rock Breaking

Authors: Yubo Li, Lei He, Yueyang Li, Weiqiang Zhu, Huaiguang Xiao, Tienan Wang

The influence of the heating rate on the thermo-mechanical response and damage evolution of rock is a critical factor limiting the safety and efficiency of engineering applications. Conventional models are limited, however, as they assume a static coefficient of thermal expansion (CTE) and ignore its dynamic nature under rapid thermal loading. This study confronts this knowledge gap using a synergistic experimental–numerical approach. A custom system combining induction heating and Digital Image Correlation was employed to measure the rate-dependent CTE of both bulk granite and its constituent minerals over various heating rates. These dynamic coefficients were then integrated into a high-fidelity numerical model to simulate microwave-assisted rock breaking. Results definitively show the CTE is strongly rate-dependent. While the quartz phase transition at ~573 °C triggers critical damage, faster heating significantly amplifies strain localization and damage accumulation. Crucially, simulations revealed that under identical microwave loading, the model using dynamic CTE (530 °C/min) reached a 1000 mm² failure area 11 times faster than the model using quasi-static CTE (5 °C/min). This study fundamentally establishes rock's CTE as a dynamic, rate-dependent property, providing a key scientific basis for advancing such thermal fracturing technologies.

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Heating Rate Effect of Thermal Expansion in Granite and Implications for Rock Breaking

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