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Microscope-based automated image analysis systems have been used to obtain data regarding mineral liberation. However, this kind of analysis leads to stereological bias due to the intrinsic two-dimensionality characteristic of the technique. Three-dimensional imaging techniques such as X-ray microtomography comes as an alternative method to measure liberation. We explored the potentiality of high-resolution X-ray microtomography to investigate the characteristics of liberation of a Brazilian bauxite. Grade distributions in 2D and 3D were correspondent when all possible cross-sections were considered in 2D. However, 2D surface exposure did not converge accurately to the 3D method due to the loss of 3D information.

Determination of Mineral Liberation of a Bauxite Ore Based on 3D Compositional and Textural Characteristics Using X-ray Microtomography