Effect of frothers and solid particles on the rate of water transfer to froth

Melo, Francisco Vicente Sales; Laskowski, J.

doi:10.1016/j.minpro.2007.04.003

Cited by 30 publications

(12 citation statements)

References 19 publications

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“…As can be seen, quartz recovery increases with increasing frother concentration when using either Dowfroth 250 or MIBC. This is in agreement with other studies (Melo and Laskowski, 2007;Rahal et al, 2001). The entrainment recovery of quartz increased from 0.15% to 1.6% as the MIBC concentration was increased from 5 ppm to 15 ppm.…”

Section: Entrainment Test Resultssupporting

confidence: 94%

“…Variation in frother (type or dosage rate) has been observed to result in significant variation in the amount of gangue materials reporting to the concentrate due to entrainment (Rahal et al, 2001;Melo and Laskowski, 2007;Comley, 2012;Wiese and Harris, 2012;Kracht et al, 2016). In froth flotation, frothers are commonly added to provide a stable froth.…”

Section: Frothermentioning

confidence: 99%

“…Rahal et al (2001) undertook a study to determine the relationship between entrainment recovery and water recovery using five industrial frothers of (Melo and Laskowski, 2007;Wiese and Harris, 2012;Kracht et al, 2016). Moreover, frothers were also found to change the degree of entrainment, with frother dosage increasing the concentration of gangue materials in the water reporting to the concentrate (Rahal et al, 2001;Kracht et al, 2016).…”

Section: Frothermentioning

confidence: 99%

“…In this chapter, however, the valuable mineral was removed in the tests, which eliminated this interference. Moreover, given that this chapter aims to investigate the mechanism underpinning the effect of frother type and concentration, a longer flotation time would result in a decrease in frother concentration, as in flotation applications there is a depletion of frother concentration in the pulp due to frother preferentially reporting to the concentrate in the recovered water (Melo and Laskowski, 2007). It was assumed that such a short time would not change the frother concentration in the system significantly.…”

Section: Introductionmentioning

confidence: 99%

“…Potentially the change in the degree of entrainment may also be caused by frother which is an important variable which will be affecting froth structure. Frother can potentially deplete during the course of a flotation test as it preferentially reports to the concentrate (Melo and Laskowski, 2007). The reason for the change of the degree of entrainment with flotation time is therefore uncertain.…”

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confidence: 99%

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Entrainment of fine particles in froth flotation

Wang¹

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Entrainment has become a significant issue nowadays with fine grinding being used to liberate valuable minerals from low grade and complex ores to increase "true flotation". Entrainment results in large amounts of fine gangue materials reporting to flotation concentrates along with recovered valuable minerals and reduces the final product quality. In froth flotation, entrainment is the dominant recovery mechanism for fine gangue mineral particles, and it is influenced by a number of factors in both the pulp and froth phase, including particle properties (e.g. particle size and density) and flotation operational variables (e.g. gas flowrate, froth depth, impeller speed and reagent dosage).A number of models incorporating different factors have been developed to estimate entrainment recovery. Most of these models relate entrainment recovery to two parameters: the water recovery to concentrate, and the degree of entrainment, a classification factor to account for the degree of drainage of entrained particles with respect to the water in the pulp and froth phases of a flotation cell. However, there are still significant barriers to be overcome before they can be applied for routine estimation of entrainment in industrial applications. There is no consensus as to the variables which significantly affect the entrainment process and should therefore be included in the model as well as to the mechanisms involved.This thesis investigated the effect of flotation operational factors and particle properties on the entrainment parameters (i.e. degree of entrainment and water recovery) and the mechanisms underpinning the observed effects. The objective of the thesis was to develop a comprehensive understanding of the key operating conditions and particle attributes influencing the entrainment of gangue minerals in flotation, which should enable the development of a more sophisticated predictive entrainment model by more accurately predicting the degree of entrainment and water recovery.A two level factorial experimental program was adopted to investigate the effect of impeller speed, gas flowrate, froth height and specific gravity of gangue minerals on the degree of entrainment.Batch flotation experiments were performed in a 3.5 L conventional Agitair flotation cell using a feed which was a mixture of liberated chalcopyrite and one of two liberated gangue minerals, quartz and hematite. Results show that there was no direct correlation between the degree of entrainment and water recovery, indicating that the key drivers of water recovery were not the same as those that affected the degree of entrainment.ii The degree of entrainment was significantly influenced by particle size, particle density, frother and the interaction between gas flowrate and froth height. The mechanisms underpinning the effect of these significant influencing factors were investigated. Results suggest that the classification of gangue mineral particles mainly occurs at the pulp/froth interface region. Whether a particle moves upward into the frot...

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Section: Entrainment Test Resultssupporting

confidence: 94%