International Journal of Mining Science and Technology最新文献

{"title":"Ensemble prediction modeling of flotation recovery based on machine learning","authors":"Guichun He ,&nbsp;Mengfei Liu ,&nbsp;Hongyu Zhao ,&nbsp;Kaiqi Huang","doi":"10.1016/j.ijmst.2024.11.012","DOIUrl":"10.1016/j.ijmst.2024.11.012","url":null,"abstract":"<div><div>With the rise of artificial intelligence (AI) in mineral processing, predicting the flotation indexes has attracted significant research attention. Nevertheless, current prediction models suffer from low accuracy and high prediction errors. Therefore, this paper utilizes a two-step procedure. First, the outliers are processed using the box chart method and filtering algorithm. Then, the decision tree (DT), support vector regression (SVR), random forest (RF), and the bagging, boosting, and stacking integration algorithms are employed to construct a flotation recovery prediction model. Extensive experiments compared the prediction accuracy of six modeling methods on flotation recovery and delved into the impact of diverse base model combinations on the stacking model’s prediction accuracy. In addition, field data have verified the model’s effectiveness. This study demonstrates that the stacking ensemble approaches, which uses ten variables to predict flotation recovery, yields a more favorable prediction effect than the bagging ensemble approach and single models, achieving MAE, RMSE, <em>R</em>², and MRE scores of 0.929, 1.370, 0.843, and 1.229%, respectively. The hit rates, within an error range of ±2% and ±4%, are 82.4% and 94.6%. Consequently, the prediction effect is relatively precise and offers significant value in the context of actual production.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 12","pages":"Pages 1727-1740"},"PeriodicalIF":11.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142929240","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":"Enhancing mine groundwater system prediction: Full-process simulation of mining-induced spatio-temporal variations in hydraulic conductivities via modularized modeling","authors":"Shihao Meng ,&nbsp;Qiang Wu ,&nbsp;Yifan Zeng ,&nbsp;Leiyu Gu","doi":"10.1016/j.ijmst.2024.11.014","DOIUrl":"10.1016/j.ijmst.2024.11.014","url":null,"abstract":"<div><div>The intricate interplay between rock mechanics and fracture-induced fluid flow during resource extraction exerts profound effects on groundwater systems, posing a pivotal challenge for promoting green and safe development in underground engineering. To address this, a novel numerical model with an explicit coupling simulation strategy is presented. This model integrates distinct modules for individual physical mechanisms, ensuring second-order accuracy through shared time integration, thereby overcoming limitations in simulating mining-induced strata damage, water flow, and permeability dynamics. A novel mathematical model is incorporated into the mechanical simulation to characterize the abrupt increase in permeability resulting from rock fracture propagation. This increase is quantified by evaluating the plastic damage state of rocks and incorporating a damage coefficient that is intrinsically linked to rock strength. The mechanical model tracks permeability changes due to mining. The flow model simulates aquifer-mine water interactions by calculating hydraulic conductivity and using dynamic zoning, adapting to mining progress. When applied to a case study of a complex mine, this approach significantly improved the accuracy of water inflow rate predictions by 57%.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 12","pages":"Pages 1625-1642"},"PeriodicalIF":11.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142929243","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":"Failure mechanisms of roadways with non-coplanar axial direction and stress space: True triaxial test and mechanical analysis","authors":"Zongyu Ma ,&nbsp;Jianping Zuo","doi":"10.1016/j.ijmst.2024.11.009","DOIUrl":"10.1016/j.ijmst.2024.11.009","url":null,"abstract":"<div><div>The axial direction of a roadway often forms a certain spatial angle with the in-situ stress field. Variations in the spatial angles can lead to differences in the stress environment in which the roadway is exposed. Different forms of failure characteristics occur in the roadway. In order to study the failure mechanism with different spatial characteristics, rock-like material specimens with holes in 9 different horizontal and vertical angles were designed. The true triaxial test system was used to carry out the test with the same loading path. The results show that the horizontal angle <span><math><mrow><mi>α</mi></mrow></math></span> and vertical angle <span><math><mrow><mi>β</mi></mrow></math></span> have a significant effect on the specimen strength, specimen rupture angle, and the form of spalling failure in the hole. The spatial angle leads to the formation of asymmetric heterotype V-notches in both sides within the hole. The asymmetry is evident in both the depth and extent of spalling. The strength of the specimen increases and then decreases with increasing vertical angle <span><math><mrow><mi>β</mi></mrow></math></span>. The rupture angle increases and then decreases with increasing horizontal angle <span><math><mrow><mi>α</mi></mrow></math></span> and increases with the increase of the vertical angle <span><math><mrow><mi>β</mi></mrow></math></span>. The stress analytical model of the specimen under three-dimensional compression was established. The distribution of principal stresses around the holes was theoretically analyzed. It is found that the presence of spatial angle changes the distribution of principal stresses around the hole from symmetric to asymmetric distribution. The shift of the principal stresses is responsible for the change from a V-notch to a heterotype V-notch.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 12","pages":"Pages 1711-1725"},"PeriodicalIF":11.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142929270","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":"Enhancing CO2 mitigation potential and mechanical properties of shotcrete in underground mining utilizing microbially induced calcium carbonate precipitation","authors":"Qiusong Chen ,&nbsp;Xinyi Yuan ,&nbsp;Aixiang Wu ,&nbsp;Yikai Liu","doi":"10.1016/j.ijmst.2024.11.007","DOIUrl":"10.1016/j.ijmst.2024.11.007","url":null,"abstract":"<div><div>Achieving low-carbon development in the mining sector is fundamental for global carbon emissions abatement, especially considering the growing demand for mineral resources. Currently, the energy footprint of mines emerges as the main carbon contributor. While cleaner energy sources have the potential for reducing emissions, transitioning to these sources remains challenging. This study presents a practical CO₂ mitigation strategy for underground mining by integrating bacteria into shotcrete to enhance excavation. The findings demonstrate that bacteria can capture CO₂ from the atmosphere, thereby increasing the carbonation reactions. X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) analysis shows the captured CO₂ present in the forms of calcite, vaterite, and aragonite. The formed carbonates intermingled with the precipitated calcium-silicate-hydrate (C-S-H) at relatively low bacteria additions, densifying the cementitious matrix and improving the mechanical properties. However, high bacteria concentrations lead to excess carbonates that consume C-S-H precipitation, counteracting the benefits of carbonation and reducing mechanical strength. Optimal results were achieved with 0.3% bacteria by mass fraction, potentially mitigating 0.34 kg/m² of CO₂, which is approximately equivalent 567 g of CO₂ absorbed by 1 g of bacteria based on the effectiveness demonstrated in this study. These findings are crucial for advancing emissions control in mining and supporting climate goals outlined in the Paris Agreement.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 12","pages":"Pages 1643-1653"},"PeriodicalIF":11.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143239683","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":"An innovative test method for mechanical properties of sandstone under instantaneous unloading confining pressure","authors":"Xuesheng Liu ,&nbsp;Shenglong Yang ,&nbsp;Yunliang Tan ,&nbsp;Jun Wang ,&nbsp;Xuebin Li ,&nbsp;Yu Zhang","doi":"10.1016/j.ijmst.2024.11.011","DOIUrl":"10.1016/j.ijmst.2024.11.011","url":null,"abstract":"<div><div>With the increase of underground engineering construction depth, the phenomenon of surrounding rock sudden failure caused by supporting structure failure occurs frequently. The conventional unloading confining pressure (CUCP) test cannot simulate the plastic yielding and instantaneous unloading process of supporting structure to rock. Thus, a high stress loading-instantaneous unloading confining pressure (HSL-IUCP) test method was proposed and applied by considering bolt’s fracture under stress. The wall thickness of confining pressure plates and the material of bolts were changed to realize different confining pressure loading stiffness (CPLS) and lateral maximum allowable deformation (LMAD). The superiority of HSL-ICPU method is verified compared with CUCP. The rock failure mechanism caused by sudden failure of supporting structure is obtained. The results show that when CPLS increases from 1.35 to 2.33 GN/m, rock’s peak strength and elastic modulus increase by 25.18% and 23.70%, respectively. The fracture characteristics change from tensile failure to tensile-shear mixed failure. When LMAD decreases from 0.40 to 0.16 mm, rock’s residual strength, peak strain, and residual strain decrease by 91.80%, 16.94%, and 21.92%, respectively, and post-peak drop modulus increases by 140.47%. The test results obtained by this method are closer to rock’s real mechanical response characteristics compared with CUCP.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 12","pages":"Pages 1677-1692"},"PeriodicalIF":11.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142929241","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 novel sulfidization system for enhancing hemimorphite flotation through Cu/Pb binary metal ions","authors":"Qicheng Feng,&nbsp;Yingchao Zhang,&nbsp;Ga Zhang,&nbsp;Guang Han,&nbsp;Wenjuan Zhao","doi":"10.1016/j.ijmst.2024.11.008","DOIUrl":"10.1016/j.ijmst.2024.11.008","url":null,"abstract":"<div><div>The low reactivity of hemimorphite surfaces hinders the effective action of sulfidizing agents and xanthate, resulting in unsatisfactory flotation performance. To enhance the surface reactivity of hemimorphite with sulfidizing agents and xanthate, Cu/Pb binary metal ions were introduced into the sulfidization flotation system to enhance the sulfidization process and thereby promote hemimorphite flotation. The flotation results demonstrated a remarkable improvement in the hemimorphite flotation recovery when Cu/Pb binary metal ions were added prior to sulfidization. The flotation recovery of hemimorphite increased from less than 5% to over 80%. After strengthening the sulfidization of hemimorphite with Cu/Pb binary metal ions, the mineral surface formed multicomponent sulfide products composed of zinc, copper, and lead sulfide. The reactivity of the copper-lead sulfide components exceeds that of the zinc sulfide component; thus, the enhancement by Cu/Pb binary metal ions not only increases the content of sulfide products on the hemimorphite surface but also augments their reactivity. Contact angle and adsorption experiments indicated that after enhanced sulfidization with Cu/Pb binary metal ions, the hemimorphite surface adsorbed a greater amount of xanthate, significantly increasing the mineral surface hydrophobicity. Consequently, the enhanced sulfidization by Cu/Pb binary metal ions effectively improved the flotation behavior of hemimorphite, presenting an innovative sulfidization system for the flotation recovery of zinc silicate minerals in zinc oxide ores.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 12","pages":"Pages 1741-1752"},"PeriodicalIF":11.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142929246","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":"Combining first principles and machine learning for rapid assessment response of WO3 based gas sensors","authors":"Ran Zhang ,&nbsp;Guo Chen ,&nbsp;Shasha Gao ,&nbsp;Lu Chen ,&nbsp;Yongchao Cheng ,&nbsp;Xiuquan Gu ,&nbsp;Yue Wang","doi":"10.1016/j.ijmst.2024.12.001","DOIUrl":"10.1016/j.ijmst.2024.12.001","url":null,"abstract":"<div><div>The rapid advancement of gas sensitive properties in metal oxides is crucial for detecting hazardous gases in industrial and coal mining environments. However, the conventional experimental trial and error approach poses significant challenges and resource consumption for the high throughput screening of gas sensitive materials. Consequently, this paper introduced a novel screening approach that integrates first principles with machine learning (ML) to rapidly predict the gas sensitivity of materials. Initially, a comprehensive database of multi-physical parameters was established by modeling various adsorption sites on the surface of WO₃, which serves as a representative material. Since density functional theory (DFT) is one of the first principles, DFT calculations were conducted to derive essential multi-physical parameters, including bandgap, density of states (DOS), Fermi level, adsorption energy, and structural modifications resulting from adsorption. The collected data was subsequently utilized to develop a correlation model linking the multi-physical parameters to gas sensitive performance using intelligent algorithms. The model’s performance was assessed through receiver operating characteristic (ROC) curves, confusion matrices, and other evaluation metrics, ultimately achieving a prediction accuracy of 90% for identifying key features influencing gas adsorption performance. This proposed strategy for predicting the gas sensitive characteristics of materials holds significant potential for application in identifying additional gas sensitive properties across various materials.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 12","pages":"Pages 1765-1772"},"PeriodicalIF":11.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142929248","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)00179-4","DOIUrl":"10.1016/S2095-2686(24)00179-4","url":null,"abstract":"","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 12","pages":"Page IFC"},"PeriodicalIF":11.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143239678","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":"Improving recovery in sublevel top coal caving mining by using partially reverse drawing technique","authors":"Jinwang Zhang ,&nbsp;Dongliang Cheng ,&nbsp;Jiachen Wang ,&nbsp;Shengli Yang ,&nbsp;Xiaohang Wan ,&nbsp;Xinyang Li","doi":"10.1016/j.ijmst.2024.11.010","DOIUrl":"10.1016/j.ijmst.2024.11.010","url":null,"abstract":"<div><div>The sublevel top coal caving (SLTCC) mining technology is extensively employed in steeply inclined thick coal seams. Because of the typical characteristics of the short coal face in this mining method, a significant portion of the top coal is lost at the face end. For reducing the coal loss, the partially reverse drawing technique (PRDT) is proposed as a novel top coal drawing technique. Meanwhile, based on the Bergmark-Roos model (B-R model), a theoretical method for calculating the recovery ratio of top coal based on the top coal boundary equation and residual top coal amount is proposed. The mechanism of PRDT to reduce top coal loss at the face end is revealed by comparing with single-round sequential drawing technique (SSDT). Physical experiments and in-site observation data were used to verify the theoretical model. The results show that PRDT can effectively reduce the amount of residual coal near the roof by optimizing the shape characteristics of top coal boundary. Suggestions for improve recovery ratio in Wudong Coal Mine were given based on its face parameters.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 12","pages":"Pages 1655-1676"},"PeriodicalIF":11.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142929242","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":"Flexible coal-derived carbon fibers via electrospinning for self-standing lithium-ion battery anodes","authors":"Baolin Xing ,&nbsp;Weibo Meng ,&nbsp;Hao Liang ,&nbsp;Weiwei Kang ,&nbsp;Huihui Zeng ,&nbsp;Chuanxiang Zhang ,&nbsp;Ishioma Laurene Egun ,&nbsp;Peng Li ,&nbsp;Yijun Cao ,&nbsp;Zhengfei Chen","doi":"10.1016/j.ijmst.2024.11.013","DOIUrl":"10.1016/j.ijmst.2024.11.013","url":null,"abstract":"<div><div>A series of flexible and self-standing coal-derived carbon fibers (CCFs) were fabricated through electrospinning coupled with carbonization using bituminous coal and polyacrylonitrile (PAN) as the carbon precursors. These CCFs were utilized as free-standing lithium-ion battery (LIB) anodes. Optimizing carbonization temperature reveals that the CCFs exhibit a one-dimensional solid linear structure with a uniform distribution of graphite-like microcrystals. These fibers possess a dense structure and smooth surface, with averaging diameter from approximately 125.0 to 210.0 nm at carbonization temperatures ranging from 600 to 900 °C. During electrospinning and carbonization, the aromatic rings enriched in bituminous coal crosslink with PAN chains, forming a robust three-dimensional (3D) framework. This 3D microstructure significantly enhances the flexibility and tensile strength of CCFs, while increasing the graphite-like sp² microcrystalline carbon content, thus improving electrical conductivity. The CCFs carbonized at 700 °C demonstrate an optimal balance of sp³ amorphous and sp² graphite-like carbons. The average diameter of CCFs-700 is 177 nm and the specific surface area (SSA) is 7.2 m²·g⁻¹. Additionally, the fibers contain oxygen-containing functional groups, as well as nitrogen-containing functional groups, including pyridinic nitrogen and pyrrolic nitrogen. Owing to its characteristics, the CCFs-700 showcases remarkable electrochemical performance, delivering a high reversible capacity of 631.4 mAh·g⁻¹. CCFs-700 also exhibit outstanding cycle stability, which retains approximately all of their first capacity (400.1 mAh·g⁻¹) after 120 cycles. This research offers an economical yet scalable approach for producing flexible and self-supporting anodes for LIBs that do not require current collectors, binders and conductive additives, thereby simplifying the electrode fabrication process.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 12","pages":"Pages 1753-1763"},"PeriodicalIF":11.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142929244","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}