International Journal of Mining Science and Technology最新文献

{"title":"IFC: Editorial","authors":"","doi":"10.1016/S2095-2686(24)00164-2","DOIUrl":"10.1016/S2095-2686(24)00164-2","url":null,"abstract":"","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 11","pages":"Page IFC"},"PeriodicalIF":11.7,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143198113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Selective flocculation-flotation of ultrafine hematite from clay minerals under asynchronous flocculation regulation","authors":"Fusheng Niu ,&nbsp;Yuying Chen ,&nbsp;Jinxia Zhang ,&nbsp;Fei Liu ,&nbsp;Ziye Wang","doi":"10.1016/j.ijmst.2024.11.004","DOIUrl":"10.1016/j.ijmst.2024.11.004","url":null,"abstract":"<div><div>The clay mineral flocculation encapsulation poses a major technical challenge in the field of fine mineral separation. Enhancing the ability to separate clay minerals from target mineral surfaces is key to addressing this issue. In the flotation process of ultrafine hematite, sodium polyacrylate (PAAS) was used as a selective flocculant for hematite, polyaluminum chloride (PAC) as a flocculant for kaolinite and chlorite, and sodium oleate (NaOL) as the collector to achieve asynchronous flocculation flotation. This study examines the flotation separation performance and validates it through experiments on actual mineral samples. The results indicate that with PAAS and PAC dosages of 1.25 and 50 mg·L⁻¹, respectively, the iron grade and recovery of the actual mineral samples increased by 9.39% and 7.97%. Through Zeta potential, XPS analysis, infrared spectroscopy, and total organic carbon (TOC) testing, the study reveals the microscopic interaction mechanisms of different flocculants with minerals, providing insights for the clean and efficient utilization of ultrafine mineral resources.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 11","pages":"Pages 1563-1574"},"PeriodicalIF":11.7,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142929247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence mechanism of Fe3+ doping on the hydrophobic regulation of kaolinite/water interface: Experiments and MD simulations","authors":"Jun Chen ,&nbsp;Huanhuan Shang ,&nbsp;Yunjia Ling ,&nbsp;Feifei Jia ,&nbsp;Yali Cheng ,&nbsp;Fanfei Min","doi":"10.1016/j.ijmst.2024.10.005","DOIUrl":"10.1016/j.ijmst.2024.10.005","url":null,"abstract":"<div><div>The surface/interfacial reactivity of clay is a critical factor influencing the sedimentation of coal slurry water. To achieve efficient sedimentation of coal slurry water, this paper introduces a novel approach that regulates the hydrophobicity of defective active sites in clay minerals. Fe³⁺-doped kaolinite (Fe³⁺-Kao) was synthesized by hydrothermal methods. Subsequently, tests were conducted on the adsorption capacity, surface wettability, and agglomeration sedimentation of alkyl amine/ammonium salts (AAS) on Fe³⁺-Kao surfaces. Fe³⁺ doping significantly enhances AAS adsorption and alters surface properties from hydrophilic to hydrophobic, promoting kaolinite particle aggregation and sedimentation, thereby improving coal slurry water treatment efficiency. Molecular dynamics (MD) simulations were performed to analyze the statistical adsorption behavior of AAS on Fe³⁺-Kao surfaces. The simulation results indicate that the mechanism by which Fe³⁺ doping influences the hydrophobic regulation of kaolinite surfaces is due to the enhanced interfacial interactions between the kaolinite surface and AAS, where the interfacial effects are more pronounced on surfaces closer to the dopant sites. The findings of this research offer valuable insights for future studies on other types of lattice defects in clay minerals, as well as for the development of more efficient treatment chemicals for coal slurry water.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 11","pages":"Pages 1575-1586"},"PeriodicalIF":11.7,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142929250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Advancing green flotation: Separation of Cu-Pb minerals through the application of eco-friendly organic double reaction group depressant","authors":"Siqi Yang ,&nbsp;Xianping Luo ,&nbsp;Rufeng Chen ,&nbsp;Louyan Shen ,&nbsp;Xun Fan ,&nbsp;Jiancheng Miao ,&nbsp;Xuekun Tang","doi":"10.1016/j.ijmst.2024.11.005","DOIUrl":"10.1016/j.ijmst.2024.11.005","url":null,"abstract":"<div><div>Achieving efficient flotation separation of chalcopyrite and galena while maintaining environmental friendliness poses a challenge. This study utilized the environmentally friendly copolymer acrylic acid-2-acrylamide-2-methylpropanesulfonic acid (AA/AMPS) as a depressant to separate chalcopyrite and galena. Flotation tests revealed a significant reduction in galena recovery when AA/AMPS was employed, with minimal impact observed on chalcopyrite. In artificial mixed ore flotation, AA/AMPS was found to enhance the efficiency of copper and lead separation, surpassing K₂Cr₂O₇. Furthermore, the effectiveness of AA/AMPS in facilitating copper-lead separation has been validated in practical ore flotation. The presence of AA/AMPS inhibited the adsorption of SBX onto galena, as confirmed by zeta potential and contact angle measurements. However, the adsorption on chalcopyrite remained unaffected. Through analyses using Atomic Force Microscope, X-ray photoelectron spectroscopy, and Density Functional Theory, a robust chemical interaction between the reactive groups in AA/AMPS and Pb sites on galena was uncovered, resulting in the formation of a hydrophilic polymer layer. This layer impedes SBX adsorption and reduces galena’s floatability. In contrast, no significant chemical adsorption was observed between AA/AMPS and Cu and Fe sites on chalcopyrite, preserving its SBX affinity. Overall, AA/AMPS shows promise in replacing traditional depressants for Cu-Pb sulfide ore separation, enhancing environmental sustainability.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 11","pages":"Pages 1599-1611"},"PeriodicalIF":11.7,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143198110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental study on permeability evolution of deep high-stressed coal under major horizontal stress unloading paths","authors":"Chao Liu ,&nbsp;Jiahao Zhang ,&nbsp;Songwei Wu ,&nbsp;Jinghua Qi ,&nbsp;Beichen Yu ,&nbsp;Liang Wang","doi":"10.1016/j.ijmst.2024.10.004","DOIUrl":"10.1016/j.ijmst.2024.10.004","url":null,"abstract":"<div><div>Both bulk stress (<em>σ_ii</em>) and stress path (SP) significantly affect the transportation characteristics of deep gas during reservoir pressure depletion. Therefore, the experimental study of horizontal stress unloading on seepage behavior of gas-bearing coal under constant <em>σ_ii</em>-constraints is performed. The results show that coal permeability is affected by horizontal stress anisotropy (<em>σ</em>_H≠<em>σ</em>_h), and the contribution of minor horizontal stress to permeability is related to the differential response of horizontal strain. The slippage phenomenon is prominent in deep high-stress regime, especially in low reservoir pressure. <em>σ_ii</em> and SP jointly determine the manifestation of slippage effect and the strength of stress sensitivity (<em>γ</em>) of permeability. Deep reservoir implies an incremental percentage of slip-based permeability, and SP weakens the slippage effect by changing the elastic–plastic state of coal. However, <em>γ</em> is negatively correlated with slippage effect. From the Walsh model, narrow (low aspect-ratio) fractures within the coal under unloading SP became the main channel for gas seepage, and bring the effective stress coefficient of permeability (<em>χ</em>) less than 1 for both low-stress elastic and high-stress damaged coal. With the raise of the effective stress, the effect of pore-lined clay particles on permeability was enhanced, inducing an increase in <em>χ</em> for high-stress elastic coal.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 11","pages":"Pages 1495-1508"},"PeriodicalIF":11.7,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143198370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of the migration and environmental effects of metal elements within cementitious gangue-fly ash backfill in underground coal mines","authors":"Xuejie Deng ,&nbsp;Yuan Jiao ,&nbsp;Shicong Li ,&nbsp;Nan Zhou ,&nbsp;Yan An ,&nbsp;Erol Yilmaz ,&nbsp;Qingxue Zheng ,&nbsp;Xifeng Liang","doi":"10.1016/j.ijmst.2024.11.002","DOIUrl":"10.1016/j.ijmst.2024.11.002","url":null,"abstract":"<div><div>Cementitious gangue-fly ash backfill (CGB) is used as a green mining technology worldwide. However, under the coupled effects of geological stress and groundwater, the metal elements in the CGB tend to migrate into nearby strata, which can consequently result in pollution of the groundwater environment. In this paper, the influence of initial pH and stress damage on the migration behavior of metal elements in CGB is quantitatively studied through the multi-physical field coupling model of stress-permeability-concentration. The enhanced Nemerow index evaluation method is used to comprehensively evaluate the impact of these metal elements migration behaviors on the groundwater environment. The research results show that: (1) When the stress damage of the CGB increases from 0.76 to 0.95, the Darcy velocity at the bottom of the CGB first increases, then decreases, and finally stabilizes at 2.01×10⁻⁷ m/s. The longest time to reach the maximum Darcy velocity is 3 a. (2) When the damage of the CGB is 0.95, the farthest migration distances of Al, Cr, Mn, Fe, Ba, and Pb are 40.5, 34.0, 29.8, 32.9, 38.8 and 32.1 m, respectively. (3) The alkaline environment stimulates the migration of Al, Cr, Fe, Mn, and Pb, whereas Ba migrates farther under acidic conditions. The farthest migration distance of Ba is 31.6 m under pH 3. (4) The enhanced Nemerow index indicates that when stress damage increases from 0.76 to 0.95, the areas with poor water quality increase from 0 to 1.71%, and no area is classified as very poor grade. When the initial pH changes from 3 to 11, 100% of the region is classified as fair or above. The initial pH of the CGB has a relatively slight influence on the groundwater environment. This study provides experimental data and theoretical basis for the environmental evaluation of CGB.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 11","pages":"Pages 1551-1562"},"PeriodicalIF":11.7,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143198112","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Instability mechanisms of slope in open-pit coal mines: From physical and numerical modeling","authors":"Guanghe Li ,&nbsp;Zihuan Hu ,&nbsp;Dong Wang ,&nbsp;Laigui Wang ,&nbsp;Yanting Wang ,&nbsp;Lichun Zhao ,&nbsp;Hongjun Jia ,&nbsp;Kun Fang","doi":"10.1016/j.ijmst.2024.10.003","DOIUrl":"10.1016/j.ijmst.2024.10.003","url":null,"abstract":"<div><div>The stability of open-pit mine slopes is crucial for safe and efficient mining operations. However, the presence of weak interlayers poses significant challenges in maintaining the stability of slopes. To explore the impact of the rock arching effect on slopes during excavation, understand the deformation zones and evaluation stages in such environments, and analyze the formation and characteristics of cracks, this study investigated the instability mechanism of open-pit mine slopes with weak interlayers through physical and numerical modeling. Focusing on the Zaharnur open-pit coal mine in China as a prototype, a sophisticated physical model test employing particle image velocimetry and Brillouin optical frequency domain analysis was conducted to comprehensively analyze the displacement and strain variation characteristics of open-pit mine slopes. The displacement, strain, stress redistribution, and failure processes of slopes under excavation were comprehensively analyzed through physical and numerical modeling. The results showed that the slope model exhibited a strain pattern in which the strain incrementally increased from its center toward the edges, and the landslide thrust was converted into an internal force along the arch axis and transmitted to the supports. The concept of the rock arching effect specific to soft rocks was proposed, shedding new light on an important phenomenon specific to open-pit slopes with weak interlayers. Based on its deformation characteristics, the slope could be divided into three areas: The excavation influence area, the crack area and the failure area. In addition, the ratios of the height and width of the outermost cracks to the excavation width fluctuated in the ranges of 0.36–0.49 and 0.72–1.00, respectively. These findings contribute to a better understanding of the instability mechanisms in open-pit mine slopes with weak interlayers and provide valuable guidelines for safe mining practices.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 11","pages":"Pages 1509-1528"},"PeriodicalIF":11.7,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143198372","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Utilizing spatio-temporal feature fusion in videos for detecting the fluidity of coal water slurry","authors":"Meijie Sun ,&nbsp;Ziqi Lv ,&nbsp;Zhiqiang Xu ,&nbsp;Haimei Lv ,&nbsp;Yanan Tu ,&nbsp;Weidong Wang","doi":"10.1016/j.ijmst.2024.11.001","DOIUrl":"10.1016/j.ijmst.2024.11.001","url":null,"abstract":"<div><div>The fluidity of coal-water slurry (CWS) is crucial for various industrial applications such as long-distance transportation, gasification, and combustion. However, there is currently a lack of rapid and accurate detection methods for assessing CWS fluidity. This paper proposed a method for analyzing the fluidity using videos of CWS dripping processes. By integrating the temporal and spatial features of each frame in the video, a multi-cascade classifier for CWS fluidity is established. The classifier distinguishes between four levels (A, B, C, and D) based on the quality of fluidity. The preliminary classification of A and D is achieved through feature engineering and the XGBoost algorithm. Subsequently, convolutional neural networks (CNN) and long short-term memory (LSTM) are utilized to further differentiate between the B and C categories which are prone to confusion. Finally, through detailed comparative experiments, the paper demonstrates the step-by-step design process of the proposed method and the superiority of the final solution. The proposed method achieves an accuracy rate of over 90% in determining the fluidity of CWS, serving as a technical reference for future industrial applications.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 11","pages":"Pages 1587-1597"},"PeriodicalIF":11.7,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143198111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A new scientific explanation to rock fracture-induced electromagnetic radiation process","authors":"Xueqiu He ,&nbsp;Xianghui Tian ,&nbsp;Zhenlei Li ,&nbsp;Menghan Wei ,&nbsp;Majid Khan ,&nbsp;Liming Qiu ,&nbsp;Shengquan He ,&nbsp;Ting Ren ,&nbsp;Hani Mitri ,&nbsp;Dazhao Song","doi":"10.1016/j.ijmst.2024.11.003","DOIUrl":"10.1016/j.ijmst.2024.11.003","url":null,"abstract":"<div><div>The electromagnetic radiation (EMR) monitoring and early warning technology has experienced decades of successful applications for worldwide coal and rock dynamic disasters, yet a fundamental model unifying physical mechanism and generation process for EMR is still lacking. The effective revealing of EMR’s mechanism is crucial for dynamic disaster control and management. With this motive, a multi-scale experimental study was conducted in the earlier stage. At the micro-scale, the charge’s existence and non-uniform distribution on rock’s micro-surface were confirmed by atomic force microscope (AFM), and deduced the relationship with load changes. At the meso-scale, the time sequence synchronization and frequency domain consistency of EMR and micro-vibration (MV) in the rock fracture under load have been confirmed. Therefore, it is inferred that the vibration of the crack surface acts as the power source of rock fracture-induced EMR, and the original charge on the crack surface and the charge generated by the new crack surface are the electrical basis of EMR. Based on the above two experimental findings, this paper proposes a new mechanism of rock fracture-induced EMR defined as the electricity-vibration coupling mechanism, stating that, the vibrating charged crack generates the EMR. Subsequently, a generation model was constructed based on vibrating charged crack clusters to elucidate this mechanism. The experimental results demonstrated that the EMR waveform calculated by the model and measured by antenna exhibited good correspondence, thereby verifying the effectiveness of the constructed EMR model. The proposal of this new mechanism and the model further clarified the EMR’s mechanism induced by rock fracture. Moreover, the inter-relationship among crack propagation, vibration, and EMR was developed by this model, which could be immensely beneficial in EMR-based identification and prediction of dynamic disasters in complex mining environments worldwide.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 11","pages":"Pages 1485-1493"},"PeriodicalIF":11.7,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143198115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental investigation on the macro-mechanical behavior and micromechanical damage model of Xiyu conglomerate with pores and inclusions under triaxial compression","authors":"Yajun Cao ,&nbsp;Xuelei Duan ,&nbsp;Wei Wang ,&nbsp;Qizhi Zhu ,&nbsp;Dengfeng Zhao ,&nbsp;Long Jiang ,&nbsp;Qiang Zhang","doi":"10.1016/j.ijmst.2024.10.006","DOIUrl":"10.1016/j.ijmst.2024.10.006","url":null,"abstract":"<div><div>The complex and special mechanical properties of Xiyu conglomerate are of great significance to the construction of water conservancy and hydropower engineering. The crack characteristic stress, dilatancy behavior, and failure mechanism of Xiyu conglomerate collected from Momoke Water Control Project, southwestern China, were analyzed and discussed based on the experimental results of triaxial compression test and 3D X-ray computed tomography test. The results show that with increasing confining pressure, the deformation characteristics and all characteristic stresses increase monotonically, while the dilation angle and dilatancy index decrease, and exponential function model can accurately describe the evolution rule of dilatancy index with confining pressure. While the porosity is negatively correlated with confining pressure. The failure modes of Xiyu conglomerate include axial tensile cracks, shear cracks, local cross cracks and cracks around gravel. With increasing confining pressure, the failure modes transform from tension cracks to shear cracks. A non-associated micromechanical damage model considering pressure dependent matrix presenting tension-compression asymmetry is proposed and applied to Xiyu conglomerate with pores and a large number of gravels. By comparing numerical calculations and experimental results, the proposed micromechanical plastic damage model is able to describe the mechanical behavior of Xiyu conglomerate.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 11","pages":"Pages 1529-1549"},"PeriodicalIF":11.7,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142929249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}