Minerals Engineering最新文献_第9页

Producing green rutile from secondary ilmenite via hydrogen reduction 通过氢还原法从二级钛铁矿中生产绿色金红石

IF 4.9 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering

Pub Date : 2024-11-26 DOI: 10.1016/j.mineng.2024.109113

William Spencer, Don Ibana, Pritam Singh, Aleksandar N. Nikoloski

The use of coal for ilmenite reduction to produce synthetic rutile is widespread in industry. However, the carbon dioxide emissions associated with coal combustion pose significant environmental concerns. Alternative reductants such as hydrogen have the potential to promote environmentally friendly production of green rutile. This study aimed to assess the technical feasibility of reducing an Australian secondary (weathered) ilmenite using hydrogen, focusing on the effects of reduction temperature and time. The ilmenite was composed of 65 % titanium dioxide, 29 % iron oxide, and 6 % impurities. Samples at each stage of the processing were analysed using X-ray fluorescence spectrometry (XRF) and scanning electron microscopy (SEM). The results revealed that both temperature and time impacted ilmenite reduction, with increasing values of both parameters leading to higher reduction percentages. The maximum reduction percentages were obtained for a reduction time of 240 min at all temperatures, and there was an increase from 62 % at 973 K to 99 % at 1273 K for this reduction time. A reduction percentage of 90 % was obtained at 1273 K with a holding time of 60 min. This study indicates that a minimum temperature of 1073 K is required to achieve a reduction exceeding 90 % for secondary ilmenite. The SEM analysis showed that fine, discrete, metallised iron particles were present on the surface of the reduced secondary ilmenite. The investigation into hydrogen as an alternative reductant demonstrated improved iron–titanium separation in acid leaching compared with the conventional reduction method using coal and resulted in green rutile products with titanium dioxide grades exceeding 96 %, and iron oxide content below 1 %.

工业上普遍使用煤来还原钛铁矿以生产合成金红石。然而，与煤炭燃烧相关的二氧化碳排放会带来严重的环境问题。氢气等替代还原剂有可能促进环保型绿色金红石的生产。本研究旨在评估使用氢气还原澳大利亚二级（风化）钛铁矿的技术可行性，重点关注还原温度和时间的影响。钛铁矿由 65% 的二氧化钛、29% 的氧化铁和 6% 的杂质组成。使用 X 射线荧光光谱仪（XRF）和扫描电子显微镜（SEM）分析了每个加工阶段的样品。结果表明，温度和时间都会影响钛铁矿的还原，这两个参数值越大，还原率越高。在所有温度下，当还原时间为 240 分钟时，还原率最高，从 973 K 时的 62% 增加到 1273 K 时的 99%。在保持 60 分钟的情况下，1273 K 的还原率为 90%。这项研究表明，要使二次钛铁矿的还原率超过 90%，最低温度为 1073 K。扫描电镜分析表明，还原后的二次钛铁矿表面存在细小、离散的金属化铁颗粒。对氢气作为替代还原剂的研究表明，与使用煤炭的传统还原方法相比，在酸浸出过程中铁钛分离效果更好，生产出的绿色金红石产品二氧化钛品位超过 96%，氧化铁含量低于 1%。

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引用次数: 0

New insights into the significant drop of molybdenite flotation Recovery: The Overlooked oxidation of MoS2 basal facet 关于辉钼矿浮选回收率大幅下降的新见解：被忽视的 MoS2 基底面氧化作用

IF 4.9 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering

Pub Date : 2024-11-26 DOI: 10.1016/j.mineng.2024.109131

Dashi Lei , Yuen Yan , Songbo Ma , Xiaoliang Zhang , Xiangyu Peng , Yubin Wang , Yangge Zhu

The oxidation of molybdenite in water-oxygen system adversely affects the flotation recovery. However, previous studies primarily focused on the oxidation of MoS₂ edge surfaces, neglecting the oxidation of basal facets, which constitute a larger proportion of the overall surface area. In this work, we systematically investigated the oxidation behavior of the molybdenite base surface and explored the influence of base surface oxidation sites on flotation behavior. The results demonstrated that surface oxidation of molybdenite leaded to a negative surface potential, decreased hydrophobicity and reduced dodecane adsorption. Electrostatic potential (ESP) and density functional theory (DFT) calculations revealed that oxidation sites on the molybdenite surface exhibited a strong negative charge, enhancing the adsorption of water molecules while weakening kerosene adsorption. Molecular dynamics (MD) simulations indicated that the oxidized molybdenite surface formed a hydration layer with thickness of ∼ 6 nm, which impedes dodecane adsorption. Moreover, this study proposed an effective strategy to improve molybdenite flotation recovery, that is reducing the concentration of dissolved oxygen in the pulp to inhibit MoS₂ oxidation. These findings provide new insights into the oxidation behavior of molybdenite, and contribute to a better understanding of its flotation behavior in pulp.

辉钼矿在水氧系统中的氧化会对浮选回收率产生不利影响。然而，以往的研究主要关注 MoS2 边缘表面的氧化，而忽略了占整体表面积较大比例的基底面的氧化。在这项工作中，我们系统地研究了辉钼矿基面的氧化行为，并探讨了基面氧化点对浮选行为的影响。结果表明，辉钼矿的表面氧化会导致负表面电位、疏水性降低和十二烷吸附量减少。静电电位（ESP）和密度泛函理论（DFT）计算显示，辉钼矿表面的氧化位点表现出强烈的负电荷，增强了对水分子的吸附，同时削弱了对煤油的吸附。分子动力学（MD）模拟表明，氧化的辉钼矿表面形成了厚度为 6 nm 的水合层，阻碍了对十二烷的吸附。此外，该研究还提出了提高辉钼矿浮选回收率的有效策略，即降低矿浆中溶解氧的浓度以抑制 MoS2 氧化。这些发现为了解辉钼矿的氧化行为提供了新的视角，有助于更好地理解辉钼矿在矿浆中的浮选行为。

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引用次数: 0

Mixed surfactants with solubilization behaviors: Separation of feldspar and quartz by self-assembly flotation 具有增溶行为的混合表面活性剂：通过自组装浮选分离长石和石英

IF 4.9 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering

Pub Date : 2024-11-26 DOI: 10.1016/j.mineng.2024.109130

Xuyang Fan , Tingting Xiao , Chenyu Zhou , Haoran Wang , Zhiquan Pan , Hanjun Wu , Hong Zhou

This study designed a mixed surfactant with solubilization behavior for selective flotation separation of feldspar and quartz. By optimizing the compounding ratio and dosage of reagents, the optimal mixed surfactants, dodecylamine (DDA), sodium dodecyl sulfate (SDS), and dodecane with the concentrations of 1.75, 0.58, and 3.5 mmol/L, used in flotation separation of feldspar and quartz has the maximum flotation difference of 91.36 % at pH 3 for single mineral. The result of flotation experiments of artificial-mixed-ore shows that the Al₂O₃ grade was maintained at 14.23 %, and Al₂O₃ recovery was achieved at 69.21 % for the froth product with a selectivity index (

SI

) of 1.59. The bench-scale flotation tests confirmed a better effect by using mixed surfactants with Al₂O₃ grades of 14.72 % and the Al₂O₃ recovery of 66.62 %. The separation mechanism of quartz and feldspar was proposed through analyses of critical micelle concentration (CMC), fourier transform infrared spectrometer (FTIR), contact angle, zeta potential, microscopy image, and X-ray photoelectron spectroscopy (XPS) measurements, and indicated that the flotation difference between quartz and feldspar mainly originated from the selective adsorption of anions on feldspar and the aggregation and subsidence of quartz in mixed surfactants.

本研究设计了一种具有增溶行为的混合表面活性剂，用于长石和石英的选择性浮选分离。通过优化试剂的配比和用量，得到了长石和石英浮选分离的最佳混合表面活性剂--十二烷基胺（DDA）、十二烷基硫酸钠（SDS）和十二烷，浓度分别为 1.75、0.58 和 3.5 mmol/L，在 pH 值为 3 时，单一矿物的最大浮选差为 91.36%。人工混合矿的浮选实验结果表明，Al2O3 品位保持在 14.23%，浮选产物的 Al2O3 回收率达到 69.21%，选择性指数（SI）为 1.59。工作台浮选试验证实，使用混合表面活性剂的效果更好，Al2O3 品位为 14.72%，Al2O3 回收率为 66.62%。通过临界胶束浓度（CMC）、傅立叶变换红外光谱仪（FTIR）、接触角、ZETA电位、显微镜图像和X射线光电子能谱（XPS）测量分析，提出了石英和长石的分离机理，并指出石英和长石的浮选差异主要源于阴离子对长石的选择性吸附以及石英在混合表面活性剂中的聚集和沉降。

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引用次数: 0

The unexpected stability of froth structures formed with battery materials allow their characterization with x-ray computed tomography 电池材料形成的泡沫结构具有出乎意料的稳定性，可利用 X 射线计算机断层扫描技术对其进行表征

IF 4.9 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering

Pub Date : 2024-11-25 DOI: 10.1016/j.mineng.2024.109112

Tommi Rinne , Jukka Kuva , Rodrigo Serna-Guerrero

As a result of ongoing research on direct recycling of battery active materials, it was observed that the chemical environment in flotation operations can be manipulated to produce highly stable froths. Such unexpected behavior opened the possibility to characterize this type of metastable structures using imaging techniques such as x-ray computed tomography. In this article, a first successful three-dimensional reconstruction of a live mineral froth is reported, unveiling its structural intricacies with micron-scale detail. Using this novel approach, it was possible to observe the distribution of solid species in the froth and the corresponding bubble geometries. Furthermore, the results challenge prevailing notions about the flotation mechanisms of cathode particles, emphasizing the need for more selective reagents in the flotation of end-of-life batteries.

在对电池活性材料的直接回收利用进行研究的过程中，人们发现浮选作业中的化学环境可以通过操作产生高度稳定的泡沫。这种意想不到的行为为利用成像技术（如 X 射线计算机断层扫描）描述这类可转移结构提供了可能。本文首次成功地对活体矿物泡沫进行了三维重建，以微米尺度的细节揭示了其错综复杂的结构。利用这种新方法，可以观察到固体物质在矿沫中的分布以及相应的气泡几何形状。此外，研究结果还对有关阴极颗粒浮选机制的普遍观点提出了质疑，强调了在报废电池浮选过程中需要更具选择性的试剂。

引用次数: 0

Data-driven strategies to optimise Ma’aden Barrick Copper Company (MBCC) flotation circuit − The power of visualisation and machine learning in data mining- 优化马阿登巴里克铜业公司（MBCC）浮选回路的数据驱动战略 - 数据挖掘中可视化和机器学习的力量

IF 4.9 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering

Pub Date : 2024-11-25 DOI: 10.1016/j.mineng.2024.109128

T. Ncube , P. Olawoore , P. Maphosa , S. Mogashoa , F. AlJohani , M. Swanepoel

In this work, we present a case study demonstrating the application of Optimaviz, an advanced data analytics platform, in addressing the challenges of flotation optimization in the mining industry. The study utilizes historical data from the Jabal Sayid underground copper mine, operated by Ma’aden Barrick Copper Company (MBCC), a joint venture between Ma’aden and Barrick Corporations. Our findings reveal that maintaining cyclone feed slurry percentage solids within the range of 65–71 wt% is crucial for achieving high plant performance (rougher tails copper grade < 0.15 wt% and combined concentrate grade > 24 wt%), with deviations from this prescribed range resulting in a significant decrease in performance. Additionally, we observe the impact of the first concentrate grade (rougher concentrate grade) on overall plant performance, requiring first concentrate grade to be above 26 wt% to achieve high performance, highlighting the importance of the efficiency of the first three rougher cells on the overall plant performance. Furthermore, the study underscores the significance of the balance of power between the SAG mill and Ball mill in achieving a finer rougher feed size distribution that is required to promote flotation performance. This study demonstrates how Optimaviz can be used to effectively optimize mineral processing circuits, providing process engineers and metallurgists with a robust tool to derive actionable insights and enhance plant performance without the need for coding knowledge.

在这项工作中，我们介绍了一个案例研究，展示了 Optimaviz（一种先进的数据分析平台）在应对采矿业浮选优化挑战中的应用。这项研究利用了 Jabal Sayid 地下铜矿的历史数据，该铜矿由 Ma'aden Barrick Copper Company（MBCC）运营，MBCC 是 Ma'aden 和 Barrick Corporations 的合资企业。我们的研究结果表明，将旋流器给矿浆的固体百分比保持在 65-71 wt% 的范围内对于实现高设备性能（粗尾铜品位 < 0.15 wt%，精矿综合品位 > 24 wt%）至关重要，偏离这一规定范围会导致性能大幅下降。此外，我们还观察到第一精矿品位（粗精矿品位）对整个选矿厂性能的影响，要求第一精矿品位高于 26 wt%，才能实现高性能，这突出了前三个粗选电池的效率对整个选矿厂性能的重要性。此外，该研究还强调了 SAG 磨机和球磨机之间的功率平衡在实现更细的粗选给矿粒度分布方面的重要性，而这正是提高浮选性能所必需的。这项研究展示了 Optimaviz 如何用于有效优化矿物加工回路，为工艺工程师和冶金学家提供了一个强大的工具，使他们无需编码知识即可获得可行的见解并提高工厂性能。

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引用次数: 0

Effect of monovalent, divalent and trivalent ions on the grinding efficiency of bentonite-containing ores 一价、二价和三价离子对含膨润土矿石研磨效率的影响

IF 4.9 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering

Pub Date : 2024-11-25 DOI: 10.1016/j.mineng.2024.109094

JingJing Xu, Boris Albijanic, Nadia Kashif, Jacques Eksteen, Bogale Tadesse, Richard Alorro

Grinding efficiencies of bentonite-containing ores have been rarely investigated in the literature even though bentonite is found in various ores such as refractory and free-milling gold ores. In this work, the influence of the cation valency of grinding additives on the grinding behaviour of bentonite-containing ores has been studied. The results indicate that the presence of bentonite in the ore requires more energy for grinding compared to grinding in its absence. It was found that the particle size for the same energy consumption during grinding of the bentonite slurry decreased in the following order with cation addition: Al³⁺ > Mg²⁺ > K⁺. The additions of Al³⁺ ions particularly reduced the repulsive forces between bentonite particles as confirmed using the zeta potential measurements. Therefore, the ore-bentonite slurries in the presence of Al³⁺ significantly reduced shear forces between particles, leading to improved settling rates and grinding performance. This paper illustrates how the valency number of added grinding additives can substantially alter slurry chemistry, thereby enhancing grinding performance.

尽管膨润土存在于各种矿石（如难选冶金矿石和自由研磨金矿石）中，但文献中很少对含膨润土矿石的研磨效率进行研究。在这项工作中，研究了研磨添加剂的阳离子价对含膨润土矿石研磨行为的影响。结果表明，与不含膨润土的磨矿相比，含膨润土的矿石需要更多的磨矿能量。研究发现，在研磨膨润土矿浆过程中，相同能耗下的粒度随阳离子添加量的增加而依次减小：Al3+ > Mg2+ > K+。Al3+ 离子的添加尤其降低了膨润土颗粒之间的排斥力，这一点已在 zeta 电位测量中得到证实。因此，存在 Al3+ 的矿石-膨润土泥浆大大降低了颗粒之间的剪切力，从而提高了沉降速度和研磨性能。本文说明了所添加的研磨添加剂的价数如何大幅改变泥浆化学性质，从而提高研磨性能。

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引用次数: 0

Evolution law of plasma-induced fractures in porous media materials: A case study on coal samples 多孔介质材料中等离子体诱发裂缝的演变规律：煤炭样品案例研究

IF 4.9 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering

Pub Date : 2024-11-19 DOI: 10.1016/j.mineng.2024.109101

Zhang Xiangliang , Lin Baiquan , Zhu Chuanjie , Yang Wei , Guo Chang , Zhong Lubin

Plasma based on electrical discharge has attracted extensive attention in various fields for cracking hard coal, yet the behavior characteristics of plasma channels and the evolution law of fractures in coal have not been investigated in depth. In this study, the evolution law of plasma-induced fractures in coal was revealed by means of physical experiments and numerical simulations. Moreover, the propagation behavior of plasma channels in coal was analyzed. The main conclusions were drawn as follows. The propagation of fractures in coal manifests four behavior characteristics due to numerous minerals and pores in coal bodies: 1) Newly formed fractures are interconnected and develop towards primary fractures; 2) Mineral enrichment areas have an attraction effect on fractures; 3) Fractures propagate along interfaces between minerals and coal matrix; 4) Fractures penetrate through minerals. Besides, the development law of plasma channels in coal under different voltage conditions was explored based on the WZ (Wiesmann H J and Zeller H R. A.) breakdown model of solid dielectrics. It was found that plasma channels in coal develop from the positive electrode to the negative electrode in a “dendritic” shape. The influences of pores and pyrite in coal differ significantly on the patterns and development trends of electrical branches. Specifically, pores in coal have an attraction effect on electrical branches. This indicates a sudden increase in the electric field intensity around fractures, which leads to a surge of local stress and thereby induces the generation of fractures. The research findings are of crucial significance for theoretical study on the propagation mechanism of plasma-induced fractures in coal.

以放电为基础的等离子体在硬煤裂解方面已引起各领域的广泛关注，但等离子体通道的行为特征和煤中裂缝的演化规律尚未得到深入研究。本研究通过物理实验和数值模拟揭示了等离子体诱导煤中裂缝的演化规律。此外，还分析了等离子体通道在煤中的传播行为。主要结论如下。由于煤体中矿物质和孔隙众多，煤中裂缝的传播表现出四个行为特征：1）新形成的裂缝相互连接，并向原生裂缝发展；2）矿物富集区对裂缝有吸引作用；3）裂缝沿矿物与煤基体的界面传播；4）裂缝穿透矿物。此外，根据固体电介质的 WZ（Wiesmann H J 和 Zeller H R. A.）击穿模型，探讨了不同电压条件下煤中等离子体通道的发展规律。研究发现，煤中的等离子体通道呈 "树枝状 "从正极向负极发展。煤中的孔隙和黄铁矿对电分支的形态和发展趋势的影响有很大不同。具体来说，煤中的孔隙对电分支有吸引作用。这表明裂缝周围的电场强度会突然增加，导致局部应力激增，从而诱发裂缝的产生。该研究成果对煤中等离子体诱发裂缝的传播机理的理论研究具有重要意义。

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引用次数: 0

Influence of coagulants and flocculants dosing sequence on the dewaterability of oil sands mature fine tailings by pressure filtration 压力过滤法混凝剂和絮凝剂投加顺序对油砂成熟细尾矿脱水性的影响

IF 4.9 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering

Pub Date : 2024-11-19 DOI: 10.1016/j.mineng.2024.109110

Daowei Wang , Filipe S. Araujo , Dong Wang , Hanyu Zhang , Kaipeng Wang , Mingli Cao , Anthony Yeung , Qi Liu

Rapid and cost-effective dewatering of wet tailings is crucial for clean and sustainable production in mineral processing. In the process of dewatering oil sands mature fine tailings (MFT) through coagulation-flocculation followed by pressure filtration, we observed that the dosing sequence of coagulants and flocculants had a significant influence on dewatering efficiency. Employing two anionic commercial flocculants (SNF3338 or Kemira PAM) together with an inorganic or a natural coagulant (aluminum sulfate, or chitosan), it was found that the sequence of flocculants followed by coagulants (F-C) gave higher net water release during filtration and lower moisture content in filter cakes than those in reverse sequence (C-F). The capillary suction time measurement showed a faster water release rate from the MFT treated with the F-C sequence. Zeta potential measurements indicated that flocs formed by treatment with the F-C sequence had lower negative potential or more positive potentials, likely contributing to the stronger floc strength and improved inter-floc porosity that favored pressure filtration. The findings in this Technical Note could help optimize the chemical treatment regime and reduce chemical consumption in the filtration of fine wet tailings.

对湿尾矿进行快速、经济有效的脱水对于矿物加工的清洁和可持续生产至关重要。在通过混凝-絮凝法脱水油砂成熟精尾矿（MFT），然后进行压力过滤的过程中，我们观察到混凝剂和絮凝剂的加药顺序对脱水效率有重大影响。在使用两种阴离子商用絮凝剂（SNF3338 或 Kemira PAM）和一种无机或天然混凝剂（硫酸铝或壳聚糖）的情况下，我们发现先使用絮凝剂后使用混凝剂的顺序（F-C）与相反的顺序（C-F）相比，过滤过程中的净水释放量更高，滤饼中的水分含量更低。毛细吸力时间测量结果表明，采用 F-C 顺序处理的 MFT 的释水速度更快。Zeta 电位测量结果表明，经 F-C 顺序处理后形成的絮凝体具有更低的负电位或更高的正电位，这可能有助于增强絮凝体强度和改善絮凝体之间的孔隙度，从而有利于压力过滤。本技术说明中的研究结果有助于优化化学处理机制，减少细湿尾矿过滤过程中的化学品消耗。

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引用次数: 0

Oily-bubble and its typical applications in enhancing the separation and mass transfer processes: A review and perspectives 油性气泡及其在增强分离和传质过程中的典型应用：回顾与展望

IF 4.9 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering

Pub Date : 2024-11-19 DOI: 10.1016/j.mineng.2024.109108

Tianze Chen , Shengpeng Su , Shuo Chen , Yizhuang Wang , Yanfang Huang , Bingbing Liu , Hu Sun , Shuzhen Yang , Guihong Han

Oily-bubbles have significant advantages including a greater contact area, stronger selectivity and higher mass transfer rate compared to bubbles, which exhibit excellent industrial prospects in mineral processing, extraction metallurgy, wastewater treatment and other fields. In recent decades, extensive research has been conducted on the enhancement of separation and mass transfer processes by oily-bubbles. Although considerable excellent results and findings have been reported, a remarkable lag is still recorded concerning the detailed explanation of their formation principle, fabrication methods and typical applications. Hence, the overarching aim of this study is to conduct a comprehensive review and provide a perspective on oily-bubbles. The generation principle and fabrication methods of oily-bubbles were comprehensively summarized based on up-to-date research progress. Subsequently, the significant role of oily-bubbles in enhancing separation and mass transfer processes, with a special emphasis on mineral and secondary resource processing, as well as in the separation and purification of metals, was thoroughly evaluated. Most importantly, the technical challenges, existing problems, and future directions of research on oily-bubbles are highlighted. In summary, this review may be helpful for improving the overall understanding of oily-bubbles and their typical applications in enhancing separation and mass transfer processes.

与气泡相比，含油气泡具有接触面积大、选择性强、传质速率高等显著优点，在矿物加工、萃取冶金、废水处理等领域具有良好的工业前景。近几十年来，人们对油性气泡增强分离和传质过程进行了广泛的研究。尽管已有大量优秀的研究成果和发现，但对其形成原理、制造方法和典型应用的详细解释仍显滞后。因此，本研究的首要目的是对油性气泡进行全面回顾和透视。根据最新的研究进展，全面总结了油性气泡的生成原理和制造方法。随后，全面评估了油性气泡在加强分离和传质过程中的重要作用，特别强调了其在矿物和二次资源加工以及金属分离和提纯中的作用。最重要的是，重点介绍了油性气泡的技术挑战、现有问题和未来研究方向。总之，本综述可能有助于提高对油性气泡及其在增强分离和传质过程中的典型应用的整体认识。

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引用次数: 0

Autonomous residual monitoring of metallurgical digital twins 冶金数字双胞胎的自主残余物监测

IF 4.9 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering

Pub Date : 2024-11-18 DOI: 10.1016/j.mineng.2024.109107

Riku-Pekka Nikula , Antti Remes , Jani Kaartinen , Johanna Kortelainen , Tuomas Loponen , Jari Ruuska , Mika Ruusunen

The importance of digital twin maintenance has recently surfaced through findings from industrial applications. Changes in actual physical systems affect the resemblance between digital and physical twins, which can be seen in the continuously changing variation in model residuals. In this study, a method that autonomously updates itself is proposed for monitoring multivariate residuals. It is independent of the models used and monitors normalised residuals based on the squared Mahalanobis distance. The main novelty comes from the normalisation, which is done by using autonomously updated mean and standard deviation values of recent residuals. The method was studied by using an offline simulation model of a grinding circuit in a phosphate concentrator and an online adaptive digital twin model of a flotation circuit in a gold mine. Its performance was compared with conventional squared Mahalanobis distance and principal component analysis methods. The proposed method detected abnormal residual deviations and had low dependence on the characteristics of initial training data, defined by mean and standard deviation. After training with different data sets, the median monitored values of squared Mahalanobis distance remained consistently at values corresponding to 50–57% chi-square distribution probabilities, whereas without autonomous updating, the corresponding values were in the ranges of 3–55% and 39–88% showing inconsistent performance due to the varying distributions of training data sets. The proposed method with transferable and self-configuring properties can advance the online performance monitoring of digital twins.

数字孪生维护的重要性最近在工业应用中得到了体现。实际物理系统的变化会影响数字孪生与物理孪生之间的相似性，这可以从模型残差的持续变化中看出来。本研究提出了一种可自主更新的方法，用于监测多变量残差。该方法独立于所使用的模型，并根据马哈拉诺比斯距离平方监测归一化残差。该方法的主要新颖之处在于归一化，即使用最近残差的自主更新的平均值和标准偏差值进行归一化。通过使用磷酸盐选矿厂研磨回路的离线仿真模型和金矿浮选回路的在线自适应数字孪生模型，对该方法进行了研究。该方法的性能与传统的马哈拉诺比距离平方法和主成分分析法进行了比较。所提出的方法能检测出异常的残差，而且对初始训练数据特征（由平均值和标准偏差定义）的依赖性较低。使用不同的数据集进行训练后，Mahalanobis 平方距离的中位数监测值始终保持在与 50-57% 的卡方分布概率相对应的值上，而在没有自主更新的情况下，相应的值在 3-55% 和 39-88% 之间，这表明由于训练数据集的分布不同，其性能也不一致。所提出的方法具有可转移和自主配置的特性，可推进数字孪生的在线性能监测。

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引用次数: 0