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学者姓名：左蔚然
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Abstract ：
With combined efforts from the mineral liberation analyzer (MLA), elementary analysis and sulfur speciation analysis, this study expands upon coal fragmentation using high voltage pulse (HVP) by incorporating an understanding about deportment of specific minerals due to density behavior. Mineral characteristics showed that the minerlisation of middlings sample was predominantly banded, and pyrite was most of all associated with the mineral matter, to a lesser extent, with the organic matter. In addition, it was found that the pyritic sulfur attained a higher propensity for the heavy densities than the total sulfur, and the results were supported by speciation analysis. For Test 3, the total sulfur (0.86%) predominantly arose from organic sulfur due to the condensation of organic matter in the -1.3RD fraction, whereby the pyritic sulfur merely accounted for 25.80% of the total sulfur. It is concluded that the metalliferous grain-induced breakdown resulted in pulse selectivity between the middling particles. The improvement in coal middlings reprocessability (deashing and desulfuration) predominantly arose from the generation of cracks/microcracks. The results of this study have shown that the high voltage pulse (HVP) technique holds considerable promise for coal middlings reprocessing in comparison with the mechanical crushing method.
Keyword ：
coal middlings coal middlings High voltage pulse High voltage pulse mineralogy characteristics mineralogy characteristics selective liberation selective liberation
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| GB/T 7714 | Huo, Xiaodong , Dong, Luokang , Zuo, Weiran et al. Coal middling retreatment using high voltage pulses technique: selective liberation mechanism [J]. | INTERNATIONAL JOURNAL OF COAL PREPARATION AND UTILIZATION , 2024 . |
| MLA | Huo, Xiaodong et al. "Coal middling retreatment using high voltage pulses technique: selective liberation mechanism" . | INTERNATIONAL JOURNAL OF COAL PREPARATION AND UTILIZATION (2024) . |
| APA | Huo, Xiaodong , Dong, Luokang , Zuo, Weiran , Huang, Wei . Coal middling retreatment using high voltage pulses technique: selective liberation mechanism . | INTERNATIONAL JOURNAL OF COAL PREPARATION AND UTILIZATION , 2024 . |
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Vibrating flip-flow screens are widely employed in the deep screening processes of coal washing, solid waste treatment, metallurgy, and other fields, playing a crucial role in enhancing product quality and production efficiency. The screen surface and material movement of vibrating flip-flow screens are highly complex, and there is currently insufficient understanding of their screening mechanism, limiting further optimization and application. In this paper, the Discrete Element Method (DEM), Finite Element Method (FEM), and Multi-Body Dynamics (MBD) were integrated to establish a numerical coupling model for vibrating flip-flow screens, considering material loads, screen surface deformation, and screen machine dynamics. The Response Surface Method was utilized to analyze the significant impact of relative amplitude, tension amount, amplitude of driving screen frame, vibration frequency, and screen surface inclination on screening efficiency and material velocity. The results indicate that the most significant factor influencing the screening of flip-flow screens is the screen surface inclination. Based on a BP neural network, a five-degree-of-freedom inclination surrogate model for flip-flow screens was established. The whale algorithm was employed for multi-objective optimization of the surrogate model, resulting in a screen surface inclination distribution that meets the requirements of different operating conditions.
Keyword ：
numerical coupling simulation numerical coupling simulation optimization design optimization design screening process screening process surrogate model surrogate model vibrating flip-flow screen vibrating flip-flow screen
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| GB/T 7714 | Xu, Ningning , Wang, Xinwen , Lin, Dongdong et al. Numerical Simulation and Optimization of Screening Process for Vibrating Flip-Flow Screen Based on Discrete Element Method-Finite Element Method-Multi-Body Dynamics Coupling Method [J]. | MINERALS , 2024 , 14 (3) . |
| MLA | Xu, Ningning et al. "Numerical Simulation and Optimization of Screening Process for Vibrating Flip-Flow Screen Based on Discrete Element Method-Finite Element Method-Multi-Body Dynamics Coupling Method" . | MINERALS 14 . 3 (2024) . |
| APA | Xu, Ningning , Wang, Xinwen , Lin, Dongdong , Zuo, Weiran . Numerical Simulation and Optimization of Screening Process for Vibrating Flip-Flow Screen Based on Discrete Element Method-Finite Element Method-Multi-Body Dynamics Coupling Method . | MINERALS , 2024 , 14 (3) . |
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The flip-flow vibrating screen (FFVS) is a novel multi-body screening equipment that utilizes vibrations to classify bulk materials in the field of screening machinery. The relative amplitude of FFVSs determines the tension and ejection intensity of elastic flip-flow screen panels, which is a critical operating parameter affecting the screening performance. However, FFVSs generally suffer from large variations of relative amplitude caused by the loading of materials and the changes in shear spring stiffness (the temperature changes of the shear springs lead to their stiffness changes), which significantly reduce the screening efficiency and lifespan of FFVSs. To address this problem, this paper proposes a nonlinear stiffness-based method for stabilizing the vibration amplitude of FFVSs using piecewise linear springs. By introducing these springs between the two frames, the sensitivity of the relative amplitude to shear spring stiffness is reduced, thereby achieving the stabilization of the relative amplitude of FFVSs. In this study, the variations of the vibration amplitude of the FFVS due to the loading of materials and the changes in shear spring stiffness were first demonstrated in a reasonable operating frequency range. Then the reasonable operating frequency range and dynamics of the resultant nonlinear flip-flow vibrating screen (NFFVS) with piecewise linear springs were investigated using the harmonic balance method (HBM) and the Runge-Kutta numerical method. The operating frequency region for the NFFVS lies between the critical frequency omega cs and the frequency omega lb corresponding to the saddle-node bifurcation point. Finally, a test rig was designed to validate the theoretical predictions. Theoretical and experimental results demonstrate that piecewise linear springs can effectively stabilize the relative amplitude of the FFVS.
Keyword ：
flip-flow vibrating screen flip-flow vibrating screen harmonic balance method harmonic balance method jump phenomenon jump phenomenon piecewise linear spring piecewise linear spring
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| GB/T 7714 | Lin, Dongdong , Wang, Xinwen , Xu, Ningning et al. A Method for Stabilizing the Vibration Amplitude of a Flip-Flow Vibrating Screen Using Piecewise Linear Springs [J]. | MINERALS , 2024 , 14 (4) . |
| MLA | Lin, Dongdong et al. "A Method for Stabilizing the Vibration Amplitude of a Flip-Flow Vibrating Screen Using Piecewise Linear Springs" . | MINERALS 14 . 4 (2024) . |
| APA | Lin, Dongdong , Wang, Xinwen , Xu, Ningning , Zuo, Weiran , Liang, Zhian . A Method for Stabilizing the Vibration Amplitude of a Flip-Flow Vibrating Screen Using Piecewise Linear Springs . | MINERALS , 2024 , 14 (4) . |
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传统湿法炼锌工艺存在烟气处理成本高、综合回收率低等问题，近年来，氧压浸出技术因其原料适应性强、锌回收率高、环境污染小等优点被应用于锌冶炼工业。介绍了锌精矿氧压浸出的生产工艺，论述了浸出过程反应的基本原理，以及离子催化、温度、酸度、分散剂等条件对浸出过程离子行为的影响与机理。讨论了锌精矿中伴生元素铁、镓、锗、铟、银等的浸出行为及在不同浸出条件下浸出行为的变化。
Keyword ：
氧压浸出 氧压浸出 湿法炼锌 湿法炼锌 硫酸浸出 硫酸浸出 锌精矿 锌精矿
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| GB/T 7714 | 刘鑫宇 , 郭宝 , 左蔚然 . 锌精矿氧压浸出技术研究进展 [J]. | 有色金属(冶炼部分) , 2024 , (05) : 19-26 . |
| MLA | 刘鑫宇 et al. "锌精矿氧压浸出技术研究进展" . | 有色金属(冶炼部分) 05 (2024) : 19-26 . |
| APA | 刘鑫宇 , 郭宝 , 左蔚然 . 锌精矿氧压浸出技术研究进展 . | 有色金属(冶炼部分) , 2024 , (05) , 19-26 . |
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Flip-flow vibrating screens (FFVSs) effectively tackle the challenges posed by the dry deep-screening of wet, fine, low-grade bituminous coal, thereby facilitating advancements in the thermal coal preparation process. The tensile lengths of the screen panels not only influence the service lives of the screen panels but also play a pivotal role in determining the screening performance of the FFVSs. To investigate the effect of the screen-panel tensile length on the screening performance of an FFVS, this study constructs a dual-mass flip-flow screening test rig. The experimental results reveal that when the fine-particle content and the external water content in the feed of low-grade bituminous coal are 55% and 16%, respectively, the most favorable tensile length of the screen panels is 2 mm. With a fine-particle content of 55% in the feed of low-grade bituminous coal and an increase in the external water content from 4% to 20%, the screening efficiency of the FFVS initially decreases and then increases. Notably, low-grade bituminous coal with 16% external water content poses the most challenging screening conditions. Furthermore, when the external water content of the low-grade bituminous coal is 16% and the fine-particle content in the feed increases from 25% to 55%, the screening efficiency of the FFVS gradually improves.
Keyword ：
flip-flow vibrating screen flip-flow vibrating screen low-grade bituminous coal low-grade bituminous coal screening performance screening performance screen-panel tensile length screen-panel tensile length
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| GB/T 7714 | Lin, Dongdong , Zhang, Xiaokun , Li, Ruile et al. Effect of Screen-Panel Tensile Length and Material Characteristics on Screening Performance of Flip-Flow Vibrating Screens for Dry-Screening Fine, Low-Grade Bituminous Coal [J]. | MINERALS , 2024 , 14 (3) . |
| MLA | Lin, Dongdong et al. "Effect of Screen-Panel Tensile Length and Material Characteristics on Screening Performance of Flip-Flow Vibrating Screens for Dry-Screening Fine, Low-Grade Bituminous Coal" . | MINERALS 14 . 3 (2024) . |
| APA | Lin, Dongdong , Zhang, Xiaokun , Li, Ruile , Xu, Ningning , Qiao, Dezheng , Wang, Ziqian et al. Effect of Screen-Panel Tensile Length and Material Characteristics on Screening Performance of Flip-Flow Vibrating Screens for Dry-Screening Fine, Low-Grade Bituminous Coal . | MINERALS , 2024 , 14 (3) . |
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矿山碎磨作业电力消耗占据全球总电力消耗的近2%,同时也是矿山生产中能耗最高的作业单元。碎磨流程能耗预测是碳排放和能源管理、矿山生产管理和数字矿山建设必不可少的重要环节。对基克、雷廷格和邦德等关于碎磨功耗的三大经典理论进行了回顾,着重介绍了邦德理论的发展历程并讨论了其在现代碎磨流程生产实践中应用的局限性。对上世纪70年代以来陆续提出的多种新的碎磨功耗理论进行了介绍,并讨论对比了邦德理论模型和新的理论模型对碎磨流程单位能耗的预测精度。总结了碎磨功耗理论模型在碎磨工艺流程设计与设备选型、碎磨流程运行效率评估与优化、金属矿山生产能力预测与管理以及金属矿山碎磨能耗碳评估模型等4个方面的应用价值。尽管该领域自主知识产权上的不足对我国数据安全和矿山生产造成了障碍,但随着国内矿山数字化智能化建设的飞速发展,我国碎磨功耗理论模型必将在较短时间内迎来显著的突破。
Keyword ：
智能矿山 智能矿山 矿石碎磨特性 矿石碎磨特性 碎磨功耗理论 碎磨功耗理论 碳排放评估 碳排放评估
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| GB/T 7714 | 左蔚然 , 戴元松 , 许京伟 et al. 碎磨功耗理论的发展与展望 [J]. | 金属矿山 , 2024 , PageCount-页数: 12 (05) : 16-27 . |
| MLA | 左蔚然 et al. "碎磨功耗理论的发展与展望" . | 金属矿山 PageCount-页数: 12 . 05 (2024) : 16-27 . |
| APA | 左蔚然 , 戴元松 , 许京伟 , 杨云 . 碎磨功耗理论的发展与展望 . | 金属矿山 , 2024 , PageCount-页数: 12 (05) , 16-27 . |
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钢球与钢锻作为磨矿介质在磨矿效率上的差异长期存在争议,基于实验室试验和磨矿流程模拟,对钢球和钢锻在实验室球磨机和工业磨矿回路的表现进行了对比。对云南某钨矿石进行了增强型邦德球磨功指数试验,并采用理想混合模型对2种磨矿介质在实验室试验中的破碎率参数(r/d)进行了计算。根据实验室试验获得的破碎率参数,采用球磨机放大数学模型预测了工业规模球磨磨矿回路的循环倍率和产品粒度。结果表明,尽管2种介质可以在实验室试验中获得相近的邦德球磨功指数,但在粗粒端钢锻产生的破碎率参数比钢球更大,在细粒端则相反。在工业规模球磨磨矿回路中,当循环倍率接近时,2种介质产生的旋流器溢流产品粒度分布总体较接近,但相比于钢球介质,钢锻的产品粒度分布更均匀,粗颗粒含量和细颗粒含量均少于对应的钢球产品。由于最终产品粒度分布曲线形状上的差异,对钢球与钢锻磨矿效率进行比较时,可能会受到所选磨矿细度衡量指标(P80或-0.075 mm含量)的影响。因此,应当结合矿石的实际解离特征和浮选作业的具体需求,来决定采用哪种磨矿细度衡量指标进行评估。
Keyword ：
流程模拟 流程模拟 球磨机 球磨机 磨矿效率 磨矿效率 钢球 钢球 钢锻 钢锻
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| GB/T 7714 | 李明珠 , 左蔚然 , 白俊智 . 基于球磨机放大数学模型的钢球与钢锻磨矿效率对比研究——以某钨矿石为例 [J]. | 金属矿山 , 2024 , PageCount-页数: 7 (05) : 269-275 . |
| MLA | 李明珠 et al. "基于球磨机放大数学模型的钢球与钢锻磨矿效率对比研究——以某钨矿石为例" . | 金属矿山 PageCount-页数: 7 . 05 (2024) : 269-275 . |
| APA | 李明珠 , 左蔚然 , 白俊智 . 基于球磨机放大数学模型的钢球与钢锻磨矿效率对比研究——以某钨矿石为例 . | 金属矿山 , 2024 , PageCount-页数: 7 (05) , 269-275 . |
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Predicting the liberation distribution of minerals in comminuted ore particles is one of the fundamental problems in mineral processing. However, there is still no widely accepted liberation model due to the complexity of the mineral fracture mechanism. In this study, the shape constants of the cumulative beta distribution were further optimized based on the investigation of the liberation distribution and fracture mechanism of iron oxide minerals in three types of iron ores with different grain sizes by locked-cycle grinding and batch grinding to model the liberation distribution of iron oxide minerals with different grinding methods. The results showed that the liberation distribution of iron oxide minerals in the three types of iron ores with locked-cycle grinding and batch grinding was related to intergranular fracture proportion and the closeness of ore particle size and mineral grain size. By relating the shape constants of cumulative beta distribution to ore particle size, mineral grain size, and the proportion of intergranular fracture, the developed liberation model well predicted the liberation distribution of iron oxide minerals with different grinding methods and its coefficient of determination (R-2) was between 0.85-0.93.
Keyword ：
data verification data verification grain size grain size iron oxide mineral iron oxide mineral Liberation distribution Liberation distribution modeling modeling
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| GB/T 7714 | Chen, Keqiang , Yin, Wanzhong , Zuo, Weiran et al. Modeling the Liberation of Iron Ores with Different Grain Sizes Considering Intergranular Fracture [J]. | MINERAL PROCESSING AND EXTRACTIVE METALLURGY REVIEW , 2023 , 45 (6) : 632-643 . |
| MLA | Chen, Keqiang et al. "Modeling the Liberation of Iron Ores with Different Grain Sizes Considering Intergranular Fracture" . | MINERAL PROCESSING AND EXTRACTIVE METALLURGY REVIEW 45 . 6 (2023) : 632-643 . |
| APA | Chen, Keqiang , Yin, Wanzhong , Zuo, Weiran , Fu, Yafeng . Modeling the Liberation of Iron Ores with Different Grain Sizes Considering Intergranular Fracture . | MINERAL PROCESSING AND EXTRACTIVE METALLURGY REVIEW , 2023 , 45 (6) , 632-643 . |
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在矿物加工破碎中,粒度分布曲线被广泛用于表征矿石的破碎特性,为完善不同破碎条件下得出的粒度分布曲线之间的一致性研究,利用各距离公式、检验公式及相关系数等方法对实际粒度分布曲线与理论粒度分布曲线之间的一致性程度进行量化,分析和比较各方法的优缺点,并分析在粒度分布曲线中运用的可行性.在距离公式中,最小一乘法计算复杂但结果直观且具稳定性;最小二乘法方法简单但易受异常值影响;弗雷歇距离从曲线本身所具特点入手量化整体的差异.在检验公式中,K-S检验弥补了卡方检验受样本数量约束的不足,而A-D检验在K-S检验的基础上增大了后部数据的权重,使其在结果分析中更灵敏.
Keyword ：
曲线一致性 曲线一致性 破碎 破碎 粒度分布曲线 粒度分布曲线 评价方法 评价方法
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| GB/T 7714 | 李琛 , 郭静怡 , 左蔚然 . 粒度分布曲线一致性的评价方法综述 [J]. | 现代矿业 , 2023 , 39 (2) : 139-142,145 . |
| MLA | 李琛 et al. "粒度分布曲线一致性的评价方法综述" . | 现代矿业 39 . 2 (2023) : 139-142,145 . |
| APA | 李琛 , 郭静怡 , 左蔚然 . 粒度分布曲线一致性的评价方法综述 . | 现代矿业 , 2023 , 39 (2) , 139-142,145 . |
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More efficient liberation of valuable minerals from gangue would bring enormous benefits to the comminution process and the downstream beneficiation processes. However, whether particle-bed breakage can improve liberation compared with traditional grinding has been controversial. In this study, three types of iron ores with 3-0.425 mm were comminuted to -0.425 mm via the piston-die compression unit or the dry ball mill at essentially the same grinding degrees. Liberation analysis was performed using Mineral Liberation Analyzer (MLA) for each breakage method and the size fraction product. Statistical methods based on bootstrap resampling and standardized mean differences (SMD) were used to quantitatively analyze the significance of differences in the liberation distribution of iron oxide minerals with different breakage methods. MLA tests showed that the particle-bed breakage did not significantly improve the liberation degree compared to the ball mill grinding; the maximum difference of the proportion of 80-100% liberated iron oxide mineral in a certain size fraction with the two breakage methods was only 5%. The SMD was less than 1.2 in most size/composition classes, which indicated that the difference in the liberation distribution of iron oxide minerals between the two breakage methods was not statistically significant in most size/composition classes. The particle-bed breakage slightly improved the liberation of iron oxide minerals compared to ball mill grinding at the particle size of the products close to the grain size of the iron oxide minerals in the feeds.
Keyword ：
> > ball mill grinding ball mill grinding grain size grain size liberation distribution liberation distribution Particle-bed breakage Particle-bed breakage standardized mean differences standardized mean differences
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| GB/T 7714 | Chen, Keqiang , Yin, Wanzhong , Ding, Yazhuo et al. Mineral Liberation Properties of Iron Ores with Different Grain Sizes by Particle-Bed Breakage and Traditional Grinding [J]. | MINERAL PROCESSING AND EXTRACTIVE METALLURGY REVIEW , 2023 . |
| MLA | Chen, Keqiang et al. "Mineral Liberation Properties of Iron Ores with Different Grain Sizes by Particle-Bed Breakage and Traditional Grinding" . | MINERAL PROCESSING AND EXTRACTIVE METALLURGY REVIEW (2023) . |
| APA | Chen, Keqiang , Yin, Wanzhong , Ding, Yazhuo , Yang, Yang , Zuo, Weiran , Yang, Bin . Mineral Liberation Properties of Iron Ores with Different Grain Sizes by Particle-Bed Breakage and Traditional Grinding . | MINERAL PROCESSING AND EXTRACTIVE METALLURGY REVIEW , 2023 . |
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