3D Characterization of Internal Fractures in Rochester Ore Particles Crushed by Plant-Scale HPGR for Various Pressures Using High-Resolution X-Ray Computed Tomography

IF 1.5 4区工程技术 Q3 METALLURGY & METALLURGICAL ENGINEERING Mining, Metallurgy & Exploration Pub Date : 2024-04-20 DOI:10.1007/s42461-024-00981-9

Amanda N. Erskine, Jiaqi Jin, Chen-Luh Lin, Jan D. Miller, Shijie Wang

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Abstract

Recovery of metals from coarse ore particles is a great challenge for heap leaching operations of low-grade precious metal resources. Internal fractures of ore particles like micro-cracks can facilitate subsurface transportation of solution inside particles and leaching of valuable minerals. A plant-scale high-pressure grinding roll (HPGR) unit at Coeur Mining’s Rochester mine was operated at selected specific pressures to crush and prepare various products for crack analysis using high-resolution X-ray computed tomography (XCT). 3D shapes of cracks inside ore particles for selected size fractions reveal different damage mechanisms during HPGR crushing regarding particle size and crushing pressure. Close-to-surface cracks formed by abrasion were found in small 2.5 mm particles. Impact cracks with a high aspect ratio were found in particles of larger size and higher HPGR pressure. The volumetric percentage of internal fractures and the specific crack surface areas of selected ore particles are compared to give quantitative conclusions on particle damage by compression during HPGR crushing.

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利用高分辨率 X 射线计算机断层扫描技术对不同压力下工厂规模 HPGR 碾碎的罗切斯特矿石颗粒内部裂缝进行三维表征

从粗矿石颗粒中回收金属是低品位贵金属资源堆浸作业面临的巨大挑战。矿石颗粒的内部裂缝（如微裂缝）可促进溶液在颗粒内部的地下传输，并促进有价值矿物的沥滤。Coeur Mining 公司罗切斯特矿的工厂规模高压辊磨机 (HPGR) 在选定的特定压力下运行，以粉碎和制备各种产品，并使用高分辨率 X 射线计算机断层扫描 (XCT) 进行裂纹分析。选定粒度的矿石颗粒内部裂纹的三维形状揭示了 HPGR 破碎过程中与粒度和破碎压力有关的不同破坏机制。在 2.5 毫米的小颗粒中发现了由磨损形成的近表面裂纹。在粒度较大、HPGR 压力较高的颗粒中发现了高纵横比的冲击裂纹。通过比较选定矿石颗粒内部裂缝的体积百分比和特定裂缝表面积，可以得出关于 HPGR 破碎过程中颗粒受挤压破坏的定量结论。

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来源期刊

Mining, Metallurgy & Exploration Materials Science-Materials Chemistry

CiteScore

3.50

自引率

10.50%

发文量

177

期刊介绍： The aim of this international peer-reviewed journal of the Society for Mining, Metallurgy & Exploration (SME) is to provide a broad-based forum for the exchange of real-world and theoretical knowledge from academia, government and industry that is pertinent to mining, mineral/metallurgical processing, exploration and other fields served by the Society. The journal publishes high-quality original research publications, in-depth special review articles, reviews of state-of-the-art and innovative technologies and industry methodologies, communications of work of topical and emerging interest, and other works that enhance understanding on both the fundamental and practical levels.