-
Damage quantification and failure prediction of rock: A novel approach based on energy evolution obtained from infrared radiation and acoustic emission Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-09-19 Dongming Zhang, Shuaida Zhu, Mingliang Zhou, Hongwei Huang, Yue Tong
Rock failure under external force is a process of energy conversion between the external environment and the rock system. This study aims to quantify rock damage and predict failure from an energy perspective. Infrared radiation (IR) and acoustic emission (AE) technologies were used to monitor the failure process of red sandstone during uniaxial loading experiments in real time. The energy evolution
-
Implicit hydromechanical representation of fractures using a continuum approach Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-09-19 Iman Vaezi, Francesco Parisio, Keita Yoshioka, Andres Alcolea, Peter Meier, Jesús Carrera, Sebastià Olivella, Víctor Vilarrasa
Fractures control fluid flow, solute transport, and mechanical deformation in crystalline media. They can be modeled numerically either explicitly or implicitly via an equivalent continuum. The implicit framework implies lower computational cost and complexity. However, upscaling heterogeneous fracture properties for its implicit representation as an equivalent fracture layer remains an open question
-
Fracability evaluation model for unconventional reservoirs: From the perspective of hydraulic fracturing performance Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-09-19 Dingdian Yan, Luanxiao Zhao, Xuehang Song, Jizhou Tang, Fengshou Zhang
Fracability evaluation for unconventional reservoir is critical to the selection of candidate zones for post-frac productivity and plays a key role in fracturing design. Historically, the prevailing models for assessing fracability have been largely relied on brittleness indices. Brittleness indices focus mainly on rock fracture characteristics and offers limited assessment of fracture surface area
-
A study on the correlation between fractal dimension and particle breakage for tungsten ores under impact crushing Miner. Eng. (IF 4.9) Pub Date : 2024-09-18 Junquan Lai, Caibin Wu, Ningning Liao, Huiming Shen, Jiuxiang Zhong, Riqian Liu, Liangwei Li
Understanding the mechanical properties of ores is critical for optimizing the crushing and grinding processes. To investigate the breakage characteristics of tungsten ores with different particle sizes in different crushing sections during the comminution process, the breakage index (t10) and fractal dimension (D) of different particle sizes in different crushing sections were calculated using particle
-
A coarse-grained approach to modeling gas transport in swelling porous media Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-09-17 Jian Wu, Yixiang Gan, Pengyu Huang, Luming Shen
In many engineering applications, understanding gas adsorption and its induced swelling in nanoporous materials is crucial. In this study, we propose a novel coarse-grained molecular dynamics (CGMD) model with gas-gas, solid-solid, and gas-solid interactions explicitly controlled to achieve the coupling between gas transport and solid deformation at the microscale. The CGMD model has the capability
-
Failure characteristics and energy evolution process of delayed and instantaneous basalt rockburst under true triaxial conditions Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-09-17 Rujiu Zhang, Yaoru Liu, Ling Zhu, Shaokang Hou, Zi Li, Tian Zhao, Xin Chen
Rockburst hazards exhibit different spatiotemporal characteristics in deep tunnel excavation. Failure characteristics and energy evolution process of delayed and instantaneous rockburst of basalt rock were investigated based on single-sided unloading experiments under true triaxial conditions. High-speed photography and acoustic emission (AE) monitoring were used, and computed tomography (CT) scanning
-
Fractal contact and asperities coalescence of rock joints under normal loading: Insights from pressure-sensitive film measurement Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-09-17 Geng Gong, Feng Xiong, Luyi Shen, Guohua Zhang, Yi Cheng, Zhi Cheng Tang
Direct measurement of the real contact area of rock joints under normal loading is crucial for comprehending the subsurface geological processes. However, measuring this phenomenon quantitatively at site-scale or laboratory-scale is challenging. Here, we investigate the evolution mechanism of the real contact area in rock joints by conducting closure tests on artificial and saw-cut sandstone joints
-
Unsupervised clustering of mining-induced microseismicity provides insights into source mechanisms Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-09-17 Himanshu Barthwal, Robert Shcherbakov
Microseismic source mechanisms in underground mines can provide information about the rock mass response to mining. Conventional approaches to such studies rely upon moment tensor solutions that are susceptible to modeling assumptions and need reliable information about source locations and high-resolution velocity models. We propose the application of unsupervised clustering to group microseismic
-
Systematic investigation on bastnaesite flotation in the presence of dissolved calcium ions using organic acids as chelating agents Miner. Eng. (IF 4.9) Pub Date : 2024-09-17 Emmy Muhoza, Wencai Zhang, Seyed Hassan Amini
This study systematically investigated the potential of organic acids as Ca2+ ions chelating agents in bastnaesite flotation. Naturally, bastnaesite is associated with calcium-bearing gangue minerals, such as calcite (CaCO3) and fluorite (CaF2). The flotation beneficiation of bastnaesite in the presence of calcium-bearing minerals (e.g., calcite) is exceptionally complex due to the release of Ca2+
-
Identification and quantification of pyrrhotite superstructures in base metal sulfide ore samples: A critical review Miner. Eng. (IF 4.9) Pub Date : 2024-09-17 Alireza Rezvani, Foad Raji, Qi Liu, Yongjun Peng
Pyrrhotite, a ubiquitous gangue sulfide mineral in base metal sulfide ore deposits, has little to no economic value but can dilute base metal sulfide concentrates, reducing their quality and emitting SO₂ during downstream smelting. Therefore, effective rejection of pyrrhotite is crucial in the flotation of base metal sulfide ores. Pyrrhotite is characterized by various crystallographic superstructures
-
Genesis of Devonian volcanic-associated Lahn-Dill-type iron ores – part II: trace element fractionation evidences diffuse fluidventing Miner. Deposita (IF 4.4) Pub Date : 2024-09-16 Leanne Schmitt, Thomas Kirnbauer, Thomas Angerer, Dennis Kraemer, Dieter Garbe-Schoenberg, Thomas Fockenberg, Sabine Klein
-
Structural controls on cobalt mineralisation during regional metamorphism: an example from the Rajapalot area, Finland Miner. Deposita (IF 4.4) Pub Date : 2024-09-16 Mohammad Sayab, A. Menzies, R. M. Palin, A. R. Butcher, N. Cook, J. Kuva, Q. Dehaine
-
Small scale laboratory monotonic and cyclic pull out testing on grout and resin encapsulated cable bolts Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-09-16 Ashkan Rastegarmanesh, Ali Mirzaghorbanali, Kevin McDougall, Naj Aziz, Sina Anzanpour, Hadi Nourizadeh, Mahdi Moosavi
Axial studies on cable bolts can be conducted using various scale testing apparatuses. Large scale testing, while providing a powerful platform for testing, is expensive and time consuming. This study presents details of a small scale pull out testing campaign on cable bolts and investigates the results achieved. Six popular types of cable bolts were studied using an anti rotation apparatus while encapsulated
-
Remediation and improvement of abandoned iron mine soil bio-physicochemical properties by amendments and bioenergy plant Ricinus communis L Miner. Eng. (IF 4.9) Pub Date : 2024-09-16 Lala Saha, Kuldeep Bauddh
Abandoned iron mine soil (MS) contains elevated concentrations of heavy metals (HMs) with poor bio-physicochemical characteristics, causing significant risk to the environment including associated living organisms if not handled properly. Studies related to iron ore MS remediation and reclamation with commercially important bioenergy plants and economically viable amendments are still scarce and elusive
-
Insights into velocity-dependent shear characteristics of bolted rock joints: A comparative study of fully-grouted and energy-absorbing bolts Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-09-15 Hanfang Zheng, Xuezhen Wu, Yujing Jiang, Gang Wang, Bo Li
In geotechnical engineering, activities such as landslides, rockfalls, blasting, and excavation often subject jointed rock masses to dynamic shear loads, impacting project stability. With continuous innovation of anchoring support technology, the appearance of energy-absorbing bolts has provided more options for rock support. This study selected fully-grouted bolts and energy-absorbing bolts, considering
-
Study of Cerchar abrasive parameters of monomineralic rocks and its application for evaluating cutting efficiency Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-09-14 Xin-Fang Li, Xiao-Ping Zhang, Shao-Hui Tang, Wei-Qiang Xie, Xin-Mei Yang, Quan-Sheng Liu
The Cerchar test is the most commonly used method for evaluating rock abrasivity and estimating tool wear. The conventional test results are reported based on the measured changes of the wear parts, and little attention is paid to what happens on the rock surface and scratching force. Since the cutting process is the interactive behavior between cutting tools and rock materials, the changes in both
-
Amine-coated nanobubbles-assisted flotation of fine and coarse quartz Miner. Eng. (IF 4.9) Pub Date : 2024-09-14 J. Rubio, A. Azevedo, R.T. Rodrigues, G. Rojas Olivares
This study investigates the role of alkyl ether monoamine-coated nanobubbles (NBs) in assisting the flotation process of quartz across various particle sizes, on a bench scale. Experiments were conducted in a mini lab column utilizing a consortium of bubble sizes: D32 = 1200 μm for macrobubbles and D32 = 180–220 nm for amine-coated NBs. The study revealed that an increase in amine-coated NBs correlates
-
Study on the influence of the discharge end cover structure of SAG mill on the discharge capacity Miner. Eng. (IF 4.9) Pub Date : 2024-09-14 Guangtian Tian, Binghui Qiu, Wanrong Wu
The SAG mill’s discharge end cover, which comprises the slurry lifters, the grate liners, and other structures, significantly impacts the machine’s discharge capacity. The working performance of the current SAG mill when the radial structure and arc structure were adopted in the lifting bars of the grate liners and slurry lifters, respectively, was compared to investigate the influence of the discharge
-
Initiation mechanism of landslides in cold regions: Role of freeze-thaw cycles Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-09-13 Tianzheng Li, Limin Zhang, Wenping Gong, Huiming Tang, Ruochen Jiang
Freeze-thaw cycles are recognized as one of the key triggers for some major landslides in cold regions around the world. Though the effects of freeze-thaw cycles on the rock strength degradation have been studied extensively, little effort has been made to qualitatively evaluate how it contributes to the evolution from a stable rock slope to a large-scale mass movement. In this study, we use a discrete
-
Comparison of germanium recovery from copper(II) sulfate-based solution using tertiary amine and oxime extractant Miner. Eng. (IF 4.9) Pub Date : 2024-09-12 Michał Drzazga, Mateusz Ciszewski, Sylwia Kozłowicz, Sonia Kasierot
Germanium is considered by many world economies, including the USA and EU, as a critical raw material. One of the methods, which may be used in its recovery is solvent extraction. Using it application of more environmentally harmful processes like tannin concentrate precipitation or chlorination may be reduced. Solvent extraction of germanium from solution after oxidative leaching of copper cake by
-
Thermo-mechanical modelling of spalling around the deposition boreholes in an underground nuclear waste repository during its thermal phase Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-09-11 M. Cristina Saceanu, Adriana Paluszny, Diego Mas Ivars, Robert W. Zimmerman
This paper presents a three-dimensional numerical analysis of multiple fracture growth leading to the development of excavation disturbed zones and spalling around deposition boreholes in a geological disposal facility. The development of fracture patterns is simulated with the Imperial College Geomechanics Toolkit, a finite-element based simulator that can model the simultaneous nucleation, growth
-
Understanding the Energy-Saving mechanism of ceramic balls in tumbling mills Miner. Eng. (IF 4.9) Pub Date : 2024-09-11 Xin Fang, Caibin Wu, Ningning Liao, Chengfang Yuan, Jiuxiang Zhong, Shenglin Zhu, Aijun Liu, Ke Xiao
This study investigates why ceramic balls achieve superior grinding performance compared to steel balls at lower densities and lower energy consumption. Particle motion analysis shows that increasing the filling level significantly improves the velocity distribution of the grinding media. The energy input from the mill is mainly converted into the kinetic and potential energy of the media, with potential
-
Assessment of a bio-inspired frothing agent derived from Vitamin E in mineral processing Miner. Eng. (IF 4.9) Pub Date : 2024-09-11 Pouria Amani, Tina Hsia, San H. Thang, Mahshid Firouzi
Frothers play a key role in froth flotation by stabilising bubbles, which serve as a platform for separation of minerals of interest. This paper presents D-α-Tocopherol Polyethylene Glycol 6000 Succinate (VitE_PEG6000), an eco-friendly green frother. VitE_PEG6000′s frothing performance was evaluated and benchmarked against MIBC using metrics such as the dynamic and static foam stability index (DFI
-
Flotation of a copper-cobalt sulphide ore: Quantitative insights into the role of mineralogy Miner. Eng. (IF 4.9) Pub Date : 2024-09-11 Quentin Dehaine, Laurens T. Tijsseling, Gavyn K. Rollinson, Hylke J. Glass
Cobalt is mainly produced globally from Cu-Co sediment-hosted deposits in the Democratic Republic of Congo. As mining operations progress, oxidic supergene mineralisation gradually depletes, and many have been or are shifting towards extracting sulphide ore at depth. Overall, copper recovery is consistently higher than cobalt, but no in-depth investigation has been conducted to determine if this difference
-
Calibrating high-dimensional rock creep constitutive models for geological disaster prevention: An application of data assimilation methods Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-09-10 Weiya Xu, Changhao Lyu, Jiangjiang Zhang, Huanling Wang, Rubin Wang, Long Yan, Wei-Chau Xie
The study of rock creep phenomena is of paramount importance due to its potential to trigger geological disasters, such as landslides. To predict and prevent such disasters, creep constitutive models are widely employed to comprehend the time-dependent deformation of rocks. These models encompass various mechanical parameters that describe the intricate stress-strain behaviors. Nevertheless, significant
-
Pressure oxidative leaching of chromite in the NaOH-NaNO3-H2O binary sub-molten reaction medium Miner. Eng. (IF 4.9) Pub Date : 2024-09-10 Chengzong Jian, Yankuo Zhou, Mengzhi Jiang, Ying Wei, Chunyu Yan, Gang Li, Xuejun Quan
The liquid-phase oxidation of chromite ore in sub-molten medium is regarded as a clean and efficient method for the preparation of chromate. However, its industrial application is limited by the need for specialized equipment, stringent reaction conditions, and complex chromate-alkali separation processes. To enhance the leaching of chromite and achieve milder reaction conditions, this study introduces
-
Steel mill solid waste transformation: Optimizing converter sludge recycling through RHF technology Miner. Eng. (IF 4.9) Pub Date : 2024-09-10 Dongjie Zhou, Weitong Du, Jiayong Qiu, Chuanbo Zheng, Dianchun Ju, Shui Yu, Haiwei Yao, Han Ma, Rui Mao
Current methods for treating converter sludge include reintroducing it into the sintering or pelletizing process. However, this method leads to the enrichment of zinc in the blast furnace, which affects the stability of the production operation. To solve this problem, a direct reduction process utilizing multi-solid waste collaborative rotary hearth furnace (RHF) has been implemented in steel plants
-
Micro- and macro-scale fracture behaviour of brittle rocks: Comparison between the conventional Brazilian test and the advanced universal snap-back indirect tensile test (AUSBIT) Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-09-09 Fauzan Yudho Pratomo, Murat Karakus, Giang D. Nguyen, Ha H. Bui
Post-peak behaviour is crucial for the estimation of rock mass fracturing in cave mining operations where hard rocks can exhibit class-II or snap-back response when subjected to loading. Despite the rapid development of research into class-II rocks under compression, the corresponding behaviour in tensile tests has rarely been investigated, which is critical considering the complexity of rock mass
-
Effects of seismic buffer thickness on a circular rock tunnel considering seismic damage form and failure state Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-09-09 Runfang Sun, Hua Xu, Qixiang Yan, Kai Yang, Chuan Zhang
Conventional seismic designs are currently inadequate to withstand earthquakes in mountain tunnels, which have historically suffered devastating seismic damage. Seismic buffers made of expanded polystyrene geofoam, which are widely used in aboveground structures, have potential applications in tunnels. However, it is not known what the optimal thickness should be, and the seismic effects on such buffers
-
The relationship between protons and the aqueous oxidation of pyrite by molecular oxygen Miner. Eng. (IF 4.9) Pub Date : 2024-09-07 Cristina E. Cârstea, Paul Chiriță
The reaction of pyrite (FeS2) with dissolved oxygen (DO) in acidic media (pH 2.5, 3.0 and 4.0) was studied at 25 °C. In this regard, a series of experimental (potentiodynamic polarization, Electrochemical Impedance Spectroscopy (EIS) or cyclic voltammetry) and theoretical (quantum calculations) approaches were used. It was found that the proton concentration ([H+]) has not a significant influence on
-
Stable isotopes (H, C, O) and 3D fluid flow modeling constraints on gold endowment along the Augmitto-Bouzan orogenic gold deposit (Abitibi subprovince, Quebec) Miner. Deposita (IF 4.4) Pub Date : 2024-09-06 Guillaume Raymond, Georges Beaudoin, Benoît Quesnel, Christophe Scheffer, Crystal LaFlamme, René Therrien, John W. Molson
-
Discussion on “Geochemical implications of uranium-bearing thucholite aggregates in the Upper Permian Kupferschiefer Shale, Lubin district, Poland” by Syczewski et al. (2024) Miner. Deposita (IF 4.4) Pub Date : 2024-09-06 Krzysztof Foltyn, Adam Piestrzyński, Władysław Zygo, Piotr Ducki
-
Utilization of phosphorylated starch as a selective depressant for serpentine in the flotation of nickel sulfide ore Miner. Eng. (IF 4.9) Pub Date : 2024-09-06 Chenxu Zhang, Yiping Tan, Fengxiang Yin, Jian Zhao, Zhiyong Gao, Wei Sun, Belinda McFadzean, Jian Cao
Serpentine is the primary gangue for the flotation enrichment of pentlandite. In this study, phosphorylated starch (PS) was synthesized via the esterification reaction of sodium phosphate with starch and employed as the depressant in separating pentlandite and serpentine through flotation. Micro-flotation results indicated that PS exhibited superior selective depressing effects on serpentine compared
-
Experimental study on Sc-CO2 fracturing of granite under real-time high temperature and true triaxial stress Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-09-05 Yang Yang, Dawei Hu, Haizhu Wang, Yunteng Wang, Dianbin Guo, Hui Zhou
Sc-CO fracturing would be a potential stimulation method for Hot Dry Rock. A series of Sc-CO fracturing experiments were performed on granite under different temperature and stress conditions. Quantitative and qualitative analysis of injection pressure curves and cracks were conducted to explain the Sc-CO fracturing mechanism under high temperature and high stress conditions. Under the same stress
-
Dynamic change in dominant factor controls the injection-induced slip behaviors of rock fractures Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-09-05 Zhou Fang, Wei Wu
In the geo-energy industry, fluid injection induces different slip behaviors of a rock fracture, from aseismic creep to dynamic slip. The transition from aseismic creep to dynamic slip is explained by the ratio of the stiffness of surrounding rock and the critical stiffness of the fracture. However, numerous studies suggest multiple controls affecting the slip behaviors, and their joint influences
-
Study on selective depression of pullulan on specularite/chlorite flotation Miner. Eng. (IF 4.9) Pub Date : 2024-09-05 Xianren Dai, Cheng Yang, Jiandong He, Mingyang Li
The inherent similarities in the physicochemical properties and floatability of specularite and chlorite pose challenges in their effective flotation separation. Exploration and utilization of efficient depressants is vital to improve the flotation separation performance. In this study, pullulan gum (PG) was employed as a depressant in the flotation separation of specularite and chlorite, employing
-
Leaching strategies for the recovery of Co, Ni, Cu and Zn from historical tailings Miner. Eng. (IF 4.9) Pub Date : 2024-09-05 Julia Alajoki, Anssi Karppinen, Tommi Rinne, Rodrigo Serna-Guerrero, Mari Lundström
Energy transition from fossil- to a material-intensive energy system is highly dependent on the availability of Co and Ni. This has increased interest towards non-traditional raw material streams such as mining waste. In this work, leaching experiments were conducted on historical flotation tailings with low concentrations of Co (0.081 wt%), Ni (0.055 wt%), Cu (0.15 wt%) and Zn (0.17 wt%). This low
-
Hydrometallurgical recovery of vanadium and calcium from electric arc furnace slag in hydrogen based steelmaking Miner. Eng. (IF 4.9) Pub Date : 2024-09-05 Maria Kokko, Mikael Manninen, Tao Hu, Ulla Lassi, Tuomas Vielma, Janne Pesonen
A two-stage direct leaching method has been applied to selectively recover calcium (Ca) and vanadium (V) from electric arc furnace slag obtained from pilot-scale smelting of hydrogen-reduced iron. Nitric acid-ammonium nitrate-water (HNO3-NH4NO3-H2O) medium was used in the first stage to produce leachate in which Ca and magnesium (Mg) composed over 99 wt% of the dissolved elements. Sodium carbonate-sodium
-
Selective depression of galena in the galena and chalcopyrite system by the Fe(II)-activated persulfate process Miner. Eng. (IF 4.9) Pub Date : 2024-09-05 Qinbo Cao, Yan Yan, Heng Zou, Haiyu Zhang, Dianwen Liu, Shuming Wen, Yanjun Li
The separation of galena (PbS) from chalcopyrite (CuFeS2) requires strong oxidants for the depression of PbS, due to the excellent hydrophobicity of PbS. In this work, an advanced oxidation process, i.e., S2O82−/Fe2+ treatment, was employed to selectively depress PbS. The parameters of the S2O82−/Fe2+ process were determined via flotation tests as follows: pH 3, 1:1 S2O82−: Fe2+ molar ratio, and 10 min
-
Effect of artificially induced microcracks near the rock surface on granite fragmentation performance under heating treatment Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-09-04 Yanliang Li, Jiming Li, Jianming Peng, Dong Ge, Kun Bo
Various novel assisted drilling technologies enhance rock fragmentation performance by introducing microcracks on the rock surface to weaken rock strength. However, the quantitative relationship between artificially induced microcracks and rock fragmentation characteristics is not clear. In this study, we induced artificial microcracks of varying degrees on the rock surface through one-dimensional
-
The influence of morphology and the loading-unloading process on discontinuity stress states observed via photoelastic technique and its inspiration to induced seismicity Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-09-04 Dapeng Wang, Jianchun Li, Chunjiang Zou, Zhijie Wang, Jian Zhao
Stress change in rock mass caused by human activities has the potential to cause the sliding and destruction of faults and joints, resulting in induced seismicity. Laboratory experiments are conducted on a simulated fault with various teeth numbers and undulation angles to uncover the mechanism of stress change-induced seismicity. The potential risk of induced seismicity is explained using three methods:
-
Classifying iron ore with water or dust adhesion combining differential feature and random forest using hyperspectral imaging Miner. Eng. (IF 4.9) Pub Date : 2024-09-04 Jinbao Jiang, Cheng Nie, Jiushuai Deng, Kangning Li, Lixin Jia, Tiancheng Sun, Zezheng Li
Hyperspectral imaging (HSI), a promising technique integrating imaging and spectroscopy, can help sort iron ores with different total iron (TFe) contents. However, the adhesion of dust (caused by crushing) or water can affect the sorting process. Currently, the mechanisms underlying this influence and methods to conveniently mitigate it remain unclear, hindering the practical application of HSI-based
-
Mineral classification with X-ray absorption spectroscopy: A deep learning-based approach Miner. Eng. (IF 4.9) Pub Date : 2024-09-04 Zheng Fang, Shiliang Song, Hanbo Wang, Huangping Yan, Mingke Lu, Siyuan Chen, Shunren Li, Wei Liang
The current suite of algorithms used in intelligent mineral sorting equipment is largely generic, lacking the necessary adaptability and the capability for simultaneous non-destructive structural detection and quantitative analysis. To address this, we have developed two specialized algorithms based on X-ray absorption spectroscopy: the Trans-LSTM algorithm based on Transformer and Long Short-Term
-
Deep transfer learning for P-wave arrival identification and automatic seismic source location in underground mines Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-09-03 Xu Yang, Sen Li, Anye Cao, Changbin Wang, Yaoqi Liu, Xianxi Bai, Qiang Niu
Seismic monitoring routines provide a robust framework for assessing rock stability and dynamic hazards in underground mining operations. However, the labor-intensive task of manually identifying wave arrivals and the suboptimal selection of geophone arrays do not meet the stringent timeliness and accuracy necessary for seismic source location in such contexts. The precise identification of wave arrivals
-
Volumetric response and permeability evolution during carbonation of crushed peridotite under controlled stress-pressure-temperature conditions Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-09-03 Jinfeng Liu, Timotheus K.T. Wolterbeek, Christopher J. Spiers
Peridotites (olivine-rich rocks) naturally react with CO-rich fluids to eventually form carbonates. Complete conversion involves incorporation of substantial amounts of CO, which requires prolonged fluid flow. Yet, these reactions also cause a large increase in solid volume (63–84 %), raising questions on how they proceed in nature without this excess solid volume clogging fluid pathways. It has been
-
Copper tailings filtration: Influence of filter cake desaturation Miner. Eng. (IF 4.9) Pub Date : 2024-09-03 Bernd Fränkle, Thien Sok, Marco Gleiß, Hermann Nirschl
Copper mining produces immense amounts of tailings due to low ore grades. These residues are increasingly dewatered by filtration in recessed plate filter presses to ensure safer storage and high recovery of water. The process parameters filtration pressure, desaturation time, desaturation pressure and cake thickness have a significant influence on achieving water content as well as bulk material stability
-
Rising dynamics of particle-laden bubbles in presence of surfactant and turbulence Miner. Eng. (IF 4.9) Pub Date : 2024-09-03 Syamsundar M. Murali Mohan, Zhengbiao Peng, Elham Doroodchi
In the minerals industry, froth flotation is a commonly used method for separating valuable minerals from gangue. The design and efficient operation of flotation cells require a knowledge of the interplay between the system hydrodynamics and its chemistry. These parameters however are often examined in isolation using bare bubbles due to the system complexity. This study aims at investigating the coupled
-
High pre-tension reinforcing technology and design for ultra-shallow buried large-span urban tunnels Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-09-02 Qi Wang, Huayong Wei, Bei Jiang, Xuepeng Wang, Lingfeng Sun, Manchao He
Due to the thin overlying formation of ultra-shallow buried large-span urban tunnels, the surrounding rock can be easily loosened and damaged after excavation. High prestressed anchoring support can improve the self-bearing capacity of the surrounding rock. However, traditional bolts often undergo necking fracture after the yield stage and strengthening stage, and the designed pre-tension is low, generally
-
Microwave-assisted alkaline fusion followed by water-leaching for the selective extraction of the refractory metals tungsten, niobium and tantalum from low-grade ores and tailings Miner. Eng. (IF 4.9) Pub Date : 2024-09-02 Jeroen Spooren, Wendy Wouters, Bart Michielsen, Elena M. Seftel, Steven-Friso Koelewijn
The refractory metals tungsten, tantalum and niobium are considered critical raw materials in Europe. Diversifying the supply of such materials, for instance by recovering refractory metals from local low-grade ore materials could reduce their supply risks. However, the extraction processes require to be efficient with a low energy and material consumption and a minimal environmental impact. In this
-
Cassiterite geochronology and geochemistry of the Yunling Sn deposit: implication for late cenozoic mineralization in western Yunnan, China Miner. Deposita (IF 4.4) Pub Date : 2024-08-31 Ke Xiao, Xiang Sun, Rongqing Zhang, Mingjun Zheng, Tong Pei, Pete Hollings, Bin Fu, Jun Deng
-
Impact of mechanical activation and mechanochemical activation on microstructural changes, leaching rate and leachability of natural chalcopyrite Miner. Eng. (IF 4.9) Pub Date : 2024-08-31 B.N. Akhgar, M. Kavanlouei, S. Farhoudi, M.H. Rohzad
The influence of mechanical activation (MA) and mechanochemical activation (MCA) with Fe and Fe2O3 on the microstructural changes, leachability and leaching rate of natural chalcopyrite was investigated and compared. MCA pretreatments were carried out by chalcopyrite co-milling with Fe and Fe2O3 for 20 and 50 min. The XRD analysis indicated that even after 50 min MA and MCA, constituent phases of chalcopyrite
-
Intensified extraction of vanadium from vanadium-bearing titanomagnetite (VTM) concentrate via one-stage leaching and solvent extraction using acidic organophosphorus extractant Miner. Eng. (IF 4.9) Pub Date : 2024-08-31 Kurniawan Kurniawan, Hyunju Lee, Mooki Bae, Jong-Won Choi, Sookyung Kim
Vanadium-bearing titanomagnetite (VTM) is a crucial source for vanadium production. Conventional methods for recovering vanadium from VTM involving combined pyro- and hydrometallurgy (production of vanadium-rich slag, followed by leaching) or direct leaching encounter significant challenges, such as vanadium losses and complexities in metal separation stage. This study proposes an innovative approach
-
Quantitative evaluation of the difference in residual collectors in sulfide and non-sulfide flotation processes Miner. Eng. (IF 4.9) Pub Date : 2024-08-31 Wenxuan Huang, Wenbiao Liu, Yongming Zheng, Feng Rao, Lang Yang, Kaixi Jiang
In this study, three separate flotation systems were studied to define the residual collectors found in different recycled water for sulfide (xanthate-chalcopyrite), non-sulfide with anionic (NaOL-dolomite) and cationic (DTAB-quartz) collector processes. The adsorption/desorption of collectors and the adsorption morphology were studied by the zeta potential and atomic force microscopy (AFM) measurements
-
Flotation separation mechanism of rutile and chlorite using CMC as depressant Miner. Eng. (IF 4.9) Pub Date : 2024-08-31 Peng Gong, Liuyi Ren, Shenxu Bao, Yimin Zhang, Wenqing Qin, Anh V. Nguyen
In ores containing rutile, chlorite is the most common silicate gangue mineral. However, the flotation separation of rutile and chlorite has yet to be thoroughly studied. In this study, carboxymethyl cellulose (CMC) was used to depress chlorite when sodium oleate (NaOL) was used as the collector of rutile. The selective depression and its mechanism were investigated through micro-flotation experiments
-
Iron extraction from copper slag by additive-free activation roasting-magnetic separation Miner. Eng. (IF 4.9) Pub Date : 2024-08-31 Xiaoxue Zhang, Hongyang Wang, Yuqi Zhao, Liqun Luo
Iron grain growth during deep reduction roasting is important for iron enrichment from copper slag (CS) through magnetic separation. In this work, a novel method of additive-free activation roasting, including oxidation and subsequent reduction roasting, was proposed to increase the iron grain size, then the iron was extracted by magnetic separation. The phase transformation of CS during activation
-
Validation of a PGNAA sensor model for bulk material sorting Miner. Eng. (IF 4.9) Pub Date : 2024-08-31 Dylan Peukert, Chaoshui Xu, Peter Dowd
Global mineral demand is forecast to increase significantly to achieve the transition to renewable energy. Greater volumes of ore of lower grade will have to be mined to meet demand. Techniques to process large volumes of low-grade ore efficiently are being investigated to reduce the cost and impact of mining. One technique is to use sensor information to sort mined material, allowing waste to be discarded
-
A novel IoT sensor and evolution model for grinding mill liner wear monitoring Miner. Eng. (IF 4.9) Pub Date : 2024-08-30 Tao Ou, Jie Liu, Wei Chen, Zepei Ma, Youwei Xiong
Tracking mill liner wear is essential for improved plant reliability and grinding performance. This study developed a novel IoT wear sensor and a Discrete Element Modelling coupled methodology to predict and continuously evolve shell liner’s wear pattern. The IoT sensor was purposely developed to track and report the live thickness of a shell liner. Global wear pattern was then obtained by coupling
-
Enhancement of copper mobilization using acidic AlCl3 − rich lixiviant Miner. Eng. (IF 4.9) Pub Date : 2024-08-30 Eric O. Ansah, Jay R. Black, Ralf R. Haese
Copper (Cu) extraction from low-grade ores is limited by the formation of secondary minerals that can passivate the surfaces of Cu-sulphide minerals in these ores. Hence, a novel approach utilizing AlCl3 as a lixiviant was developed to modify coupled dissolution-reprecipitation processes at the mineral interface. The formation of Al-rich phases instead of Fe-hydroxysulphates enhanced Cu extraction
-
The Jinchang deposit, Ailaoshan Belt: overprint of Miocene orogenic gold mineralization on Triassic hydrothermal nickel sulfide mineralization Miner. Deposita (IF 4.4) Pub Date : 2024-08-29 Huajian Li, Qingfei Wang, David Groves, Chaoyi Dong, Weijun Weng, Wei Ma, Lin Yang, Ziqing Zhu, Jun Deng
-
A sequence of seismic event triggering in longwall coal mines based on the aftershock cascade theory Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-08-29 Xu Li, Guangyao Si, Wenzhuo Cao, Wu Cai, Joung Oh, Ismet Canbulat
Seismic events associated with longwall coal mining have not been comprehensively understood, in particular the spatial-temporal relationship between mining-induced seismic events. Current studies on longwall mining-induced seismicity have proposed various spatial-temporal relationships between seismic events, but they may not explicitly follow the Gutenberg–Richter (GR) law for seismic magnitude distribution