Prediction of mineral liberation characteristics of comminuted particles of high grade ores
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In mineral processing, the liberation of valuable mineral is of key importance in achieving high recoveries from downstream separation processes such as froth flotation and gravity concentration. To quantify mineral liberation, information on ore texture of the parent rock as well as properties of comminuted particles is essential. These properties have been quantified by statistical measures such as the proximity function and covariance function, which were extracted from SEM images of parent rock and particle polished sections, using convenient and efficient image analysis techniques based on Labview™ software. To quantify fully liberated particles, a phase specific line segment function has been introduced and evaluated by placing random line segments on the image. It was also found that the ore texture assumptions made by Barbery are not valid for the high grade sulphide ore tested and the general applicability of these assumptions is therefore questionable. Using the measured information above, predictive liberation models to quantify volumetric grade distribution of particles in 1D and 3D have been developed based on Barbery’s work. Results show that the grade distributions of composite particles predicted from the proposed1D model is closest to measured data than those of Barbery’s 1D model. The predictions using the proposed3D model are similar to those predicted from Barbery’s model and are considered more realistic as the model does not rely on assumed ore texture but on measurements made on the parent rock and particle sections.
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Zhang, Jian; Subasinghe, Nimal (2012)Determining the extent of liberation of the valuable mineral from its gangue matrix achieved at the comminution stage is of great importance in optimizing the downstream recovery processes in most mineral processing ...
Subasinghe, Nimal; Zhang, J.; Dunne, Robert (2016)© 2016 TAPPI Press. All rights reserved. Flotation of a mineral bearing particle is the result of successful completion of a chain of events, such as, producing particles with sufficient exposure of the valuable mineral ...
Zhang, Jian (2012)Liberation of valuable mineral is essential for its effective separation from gangue. Prediction of liberation requires quantification of texture of the rock and structure of the progeny particles in terms of probability ...