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<p>The efficient separation in coarse particle flotation technologies relies on the stable attachment of particles with various exposed hydrophobic mineral grain surface areas to the bubbles. In this study, micro X-ray Computed Tomography (micro-XCT), a 3D imaging technique, was used to analyze the liberation and exposure of sulfide in coarse particle flotation samples at the voxel size of 5&#xa0;μm for 4&#xa0;h using a Zeiss Xradia-400 system. Liberation analysis indicated a clean tail with very few sulfide particles missed during flotation. In addition to the liberated sulfide particles, for the coarse particle size fractions of 600&#xa0;μm x 425&#xa0;μm, 425&#xa0;μm x 300&#xa0;μm, and 300&#xa0;μm x 212&#xa0;μm, the particles with limited levels of liberation (5–50% volumetric grade of sulfide) were floated to the concentrate. Each size fraction contains about 2000 particles. The chalcopyrite and sulfide grain size analysis indicated that this copper sulfide ore has significant amount of chalcopyrite grains larger than 150&#xa0;μm in these coarse particle size fractions. The exposed sulfide grain surface area analysis showed consistent results with liberation. For the four selected particle size fractions, the particles with exposed sulfide grain surface area as little as 5% were successfully floated to the concentrate.</p>

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3D Characterization of Copper Ore Particles from Coarse Particle Flotation for Sulfide Liberation and Exposure Analysis

  • 期刊论文

  • 发表日期：

    2026年5月21日

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  • Jiazhen Liu,
  • Jiaqi Jin,
  • Chen-Luh Lin,
  • Regina Baumgartner

摘要

The efficient separation in coarse particle flotation technologies relies on the stable attachment of particles with various exposed hydrophobic mineral grain surface areas to the bubbles. In this study, micro X-ray Computed Tomography (micro-XCT), a 3D imaging technique, was used to analyze the liberation and exposure of sulfide in coarse particle flotation samples at the voxel size of 5 μm for 4 h using a Zeiss Xradia-400 system. Liberation analysis indicated a clean tail with very few sulfide particles missed during flotation. In addition to the liberated sulfide particles, for the coarse particle size fractions of 600 μm x 425 μm, 425 μm x 300 μm, and 300 μm x 212 μm, the particles with limited levels of liberation (5–50% volumetric grade of sulfide) were floated to the concentrate. Each size fraction contains about 2000 particles. The chalcopyrite and sulfide grain size analysis indicated that this copper sulfide ore has significant amount of chalcopyrite grains larger than 150 μm in these coarse particle size fractions. The exposed sulfide grain surface area analysis showed consistent results with liberation. For the four selected particle size fractions, the particles with exposed sulfide grain surface area as little as 5% were successfully floated to the concentrate.