International Journal of Mining Science and Technology最新文献

{"title":"Accumulated damage failure mechanism of anchoring structures under cyclic impact disturbance","authors":"Peng Wang ,&nbsp;Nong Zhang ,&nbsp;Jiaguang Kan ,&nbsp;Qun Wei ,&nbsp;Zhengzheng Xie ,&nbsp;Aoran Li ,&nbsp;Zhe He ,&nbsp;Jinghua Qi ,&nbsp;Xingliang Xu ,&nbsp;Changrui Duan","doi":"10.1016/j.ijmst.2024.11.006","DOIUrl":"10.1016/j.ijmst.2024.11.006","url":null,"abstract":"<div><div>Cyclic impact induces ongoing fatigue damage and performance degradation in anchoring structures, serving as a critical factor leading to the instability of deep roadways. This paper takes the intrinsic spatiotemporal relationship of macro-microscopic cumulative damage in anchoring structures as the main thread, revealing the mechanism of bearing capacity degradation and progressive instability of anchoring structure under cyclic impact. Firstly, a set of impact test devices and methods for the prestressed solid anchor bolt anchoring structure were developed, effectively replicating the cyclic impact stress paths in situ. Secondly, cyclic impact anchoring structure tests and simulations were conducted, which clarifies the damage evolution mechanism of the anchoring structure. Prestress loss follows a cubic decay function as the number of impacts increases. Under the same impact energy and pretension force, the impact resistance cycles of extended anchoring and full-length anchoring were increased by 186.7% and 280%, respectively, compared to end anchoring. The rate of internal damage accumulation is positively correlated with impact energy and negatively correlated with anchorage length. Internal tensile cracks account for approximately 85%. Stress transmission follows a fluctuating pattern. Compared to the extended anchoring, the maximum vibration velocity of the exposed end particles in the full-length anchoring was reduced by 59.31%. Damage evolution exhibits a pronounced cumulative mutation effect. Then, a three-media, two-interface mechanical model of the anchoring structure was constructed. It has been clarified that the compressive stress, tensile stress, and oscillation effect arising from rapid transitions between compression and tension are the primary internal factors responsible for the degradation of the anchoring structure’s bearing capacity. Finally, the progressive instability mechanism of the anchoring structure under cyclic impact was elucidated. The mutual feedback and superposition of media rupture, interface debonding, and bearing capacity degradation result in overall failure. The failure process involves stages dominated by oscillation-compression, tensile stress, and compression failure. A targeted control strategy was further proposed. This provides a reference for maintaining the long-term stability of deep roadways under dynamic impact loads.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 12","pages":"Pages 1693-1709"},"PeriodicalIF":11.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142929245","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":"Enhancement of 2-hydroxy-3-naphthyl hydroxamic acid adsorption on bastnaesite and monazite surfaces using H2O2 pre-oxidation for improved flotation process","authors":"Weiwei Wang ,&nbsp;Zhengyao Li ,&nbsp;Anhua Zou ,&nbsp;Kai Gao ,&nbsp;Weiyao Zhu ,&nbsp;Shaochun Hou ,&nbsp;Chunlei Guo ,&nbsp;Yuanyuan Wang","doi":"10.1016/j.ijmst.2024.10.007","DOIUrl":"10.1016/j.ijmst.2024.10.007","url":null,"abstract":"<div><div>Rare earth elements have been widely applied in various sectors. Bastnaesite and monazite are crucial rare earth minerals, and flotation is a vital technique for recovering fine-grained rare earth minerals and separating them from associated gangue minerals such as fluorite and apatite. Flotation collectors play a key role in selectively adsorbing valuable minerals, enhancing their surface hydrophobicity, which has prompted considerable research interest. However, the interaction between minerals and reagents relies on the reactivity and selectivity of the reagent groups, as well as the reactive properties of the surface atoms of the minerals. This study proposes the use of H₂O₂ oxidation to enhance the flotation process of rare earth minerals. The flotation experiments demonstrated that pre-adding H₂O₂ before introducing the flotation collector significantly improved the grade and recovery of rare earth concentrates. The adsorption mechanisms of 2-hydroxy-3-naphthyl hydroxamic acid collector on rare earth mineral surfaces before and after H₂O₂ pre-oxidation were studied. The 2-hydroxy-3-naphthyl hydroxamic acid interacts with Ce³⁺ on the surface of unoxidized rare earth minerals, forming chelate compounds with five-membered ring structures. The H₂O₂ exhibited potent oxidizing properties and oxidized the Ce³⁺ on the bastnaesite and monazite surfaces to more stable Ce⁴⁺, which demonstrated stronger binding capability with hydroxamic acid.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 11","pages":"Pages 1613-1623"},"PeriodicalIF":11.7,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143198109","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":"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}