An empirical model for the degree of entrainment in froth flotation based on particle size and density. (November 2016)

• Record Type: Journal Article
• Authors: Wang, L.; Runge, K.; Peng, Y.; Vos, C.
• Is Part Of: Minerals engineering. Volume 98(2016)
• Page Start: 187
• Page End: 193
• Publication Date: 2016-11
• Subjects: Froth flotation -- Degree of entrainment -- Modelling -- Particle size -- Particle density; Mines and mineral resources -- Periodicals; Ressources minérales -- Périodiques; Mines and mineral resources; Periodicals; Electronic journals; 622
• DOI: 10.1016/j.mineng.2016.08.025
• Languages: English
• ISSNs: 0892-6875

Abstract

Highlights: EvaluatedSavassi (1998) model for the degree of entrainment. Identified solid particle settling velocity determining the degree of entrainment. Proposed a new model for the degree of entrainment associated with mechanism. Abstract: The degree of entrainment is significantly influenced by particle size and density but there is no consensus in the literature, however, on the mechanisms involved. In addition, there has been a lack of rigorous experimental validation of proposed theories. In this study, entrainment tests with only gangue minerals were performed in a 3.5 L laboratory mechanical flotation cell using fully liberated quartz, ilmenite and hematite. The results suggest that the drainage of solids relative to water in the froth (i.e. the degree of entrainment) is a consequence of the balance between the drag force on the particle, and the apparent immersed weight of the particle in the water which potentially changes the particle settling rate. Particle size and density are two variables that affect drag force and apparent immersed weight. Therefore, particles with different particle size and density have different particle settling rates relative to water, and thus exhibit different degrees of entrainment in flotation. A new empirical model for the degree of entrainment was then proposed, incorporating the mechanism underpinning the effect of particle size and density. Results indicate that the model can be employed to predict the degree of entrainment of different gangue minerals on a size-by-size basis.