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Morphology Study of Particle Breakage Mechanisms in a Horizontal Stirred Mill: Automated and manual point counting Approaches

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Journal of Minerals and Materials Characterization and Engineering 2021年第5期9卷 528-543页

作者： Reem Roufail Bern Klein Systems Design Engineering University of Waterloo Waterloo Canada Norman B. Keevil Institute of Mining Engineering University of British Columbia Vancouver Canada

High-speed stirred mills are utilized to grind particles below 10mm. Grinding sulphide minerals to as low as 10mm achieve adequate mineral liberation for successful downstream mineral processing operations, such as flotation and leaching. Particle breakage mechanism such as fracture or abrasion, determines the morphological surface features of the product particles. It is anticipated that particles, which break along grain boundaries (intergranular) produce rough surfaces, whereas particles that break across the grain boundaries (transgranular) possess smoother surfaces. In this study, particles are ground in a stirred mill and their morphological features were analyzed using automated and manual detection methods. Literature and conventional belief are that high-speed stirred mills break particles by attrition. This paper showed that fracture is also an important breakage mechanism along with attrition. Breakage mechanism is a factor of input stress intensity, in the form of the mill agitator speed, and type of mineral. It is observed that at higher agitator speed galena fractures along the grain boundaries, whereas quartz, abrade across the grain boundaries.

关键词： Comminution Morphology Breakage Mechanism Stirred Mill Grinding manual point counting

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