Development of a flotation model incorporating liberation characteristics
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A liberation/flotation model has been developed to evaluate flotation performance, in which the grade distribution of composite particles is incorporated explicitly. The grade distribution of particles at a given size fraction was calculated using a predictive liberation model developed by the authors. Flotation behaviour of these particles in narrow size fractions were evaluated using batch flotation tests. The recovery of particles in narrow size/grade classes at various flotation times under a given flotation environment were obtained from SEM images of mounted specimens of feed, concentrate and tailings samples using image analysis techniques. By describing the size, grade and recovery data of particles in narrow size/grade classes by separate matrices, a transformation matrix technique has been developed that can predict the flotation performance of a composite sample of an ore comprising various size classes. It has been shown that the predicted results agree well with the observed results. This liberation/flotation model has wide applications in geometallurgical testing and design, where the downstream flotation performance is to be determined with limited availability of ore samples and their liberation characteristics. It also alleviates the deficiencies involved with flotation models that assumes first order behaviour.
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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 ...
Albijanic, Boris; Nimal Subasinghe, G.; Bradshaw, D.; Nguyen, A. (2015)Flotation is controlled by the bubble–particle attachment mechanism which depends on the particle surface properties i.e., the particle composition, the surface liberation of valuable minerals and collector adsorption. ...
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 ...