Selective transport of attached particles across the pulp–froth interface

Seaman, David; Manlapig, E.; Franzidis, J.-P.

doi:10.1016/j.mineng.2005.10.020

Cited by 48 publications

(24 citation statements)

References 21 publications

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“…In addition, it is well known that fine particles have a higher recovery than coarse particles through the froth. Fines are less likely to detach from bubbles and drain from the froth if they have reported to the froth by true flotation and they also do not drain as easily if reporting to the froth by entrainment [34][35][36].…”

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confidence: 99%

Determining the significance of flotation variables on froth rheology using a central composite rotatable design

Farrokhpay

Runge

et al. 2016

Powder Technology

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Determining the significance of flotation variables on froth rheology using a central composite rotatable design, Powder Technology (2015Technology ( ), doi: 10.1016Technology ( /j.powtec.2015 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT AbstractFroth performance in a flotation cell is expected to be affected by froth rheology due to change in the froth transportation rate. However, very little study has been performed to investigate how froth rheology responds to flotation variables. This paper presents an experimental program performed to study the effects of flotation variables (i.e. feed grade, feed particle size, froth height, superficial gas velocity and impeller speed) on the froth rheology. These conditions were varied using a central composite rotatable design (CCRD).

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confidence: 99%

Determining the significance of flotation variables on froth rheology using a central composite rotatable design

Farrokhpay

Runge

et al. 2016

Powder Technology

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“…These were however based on unsized observations of the various flotation cells. As a follow on from this earlier work Seaman (2006) sought to study the selective nature of the froth, with regards to particle size and their liberation characteristics. The results of his investigation highlighted two very important mechanisms causing coarse and poorly liberated particles to have lower froth recovery.…”

Section: Froth Phase Effectsmentioning

confidence: 99%

“…To determine this parameter it is necessary to have a measure of the froth recovery for that particular component in addition to the overall rate constant and numerous researchers have published methods of doing so (Rahman, et al, 2013;Alexander, 2006;Seaman, 2006;Savassi, 1998;Savassi, et al, 1997;Vera, et al, 1999;Falutsu & Dobby, 1992;Gorain, 1997).…”

Section: Predicting the Flotation Behaviour Of Composite Particlesmentioning

confidence: 99%

The effect of mineral grain textures at particle surfaces on flotation response

Vos¹

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This research investigates the contribution of the spatial arrangement of hydrophobic mineral grains at particles surface towards their flotation response and its implications for forecasting flotation response. The approach taken was to estimate this grain textural characteristic from particle sections and to identify how it affected the overall rougher and scavenger copper mineral flotation recovery from two industrial copper flotation circuits.For the second circuit the overall rougher flotation kinetic parameters for the copper mineral were also evaluated.The first contribution of this work is the demonstration that a novel textural indicator is relevant to understanding the contribution of exposed mineral grain texture on the flotation process. It is the first mineral grain textural indicator that considers both the size of the grains and the degree to which they are dispersed at the particle surface. When the indicator was applied to particle sections from flotation feed, concentrate and tail samples from two industrial copper flotation circuits, it was shown, for the first time, with confidence that while particle size and perimeter composition affect particle flotation response the spatial arrangement of the copper mineral grains at the particle surface plays a key role.For the iron-oxide-copper-gold ore, copper mineral grains in complex texture classes produced statistically higher overall rougher recoveries for the 0-20% perimeter composition class. Chalcopyrite grains in complex texture classes in the copper porphyry ore produced higher overall rougher and scavenger recoveries for the 20-40% perimeter composition class. For the 0-20% perimeter composition class statistically meaningful differences were observed for the +106 m size class. It was shown that the higher overall recoveries for the complex texture classes in this case were due to increases in the overall rougher rate of flotation, the proportions of recoverable chalcopyrite in the feed or both. For both ores the largest proportions of copper mineral within complex perimeter texture classes were within coarse particles and complex textures were less common when particle perimeters comprised more than 40% of the copper minerals. This demonstrated that in order to study the impact of this textural characteristic for the two ores it must be done within well-defined particle size and perimeter composition classes, an important outcome that has not been reported in the current literature.The second contribution is a three-step method for evaluating the flotation response of copper minerals within different grain texture classes namely; particle perimeter texture II estimation, determining coefficients of variation in the mass proportions of the target mineral within perimeter texture-composition classes and mass reconciliation and recovery calculations. Another key contribution is in applying the bootstrap resampling technique to estimate these coefficients. This demonstrated the sensitivity of seemingly feasible perimeter texture-compos...

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“…Typical mineral recovery as a function of particle size is shown in Figure 2.12, and the maximum recovery is typically between 20 -150 µm (Trahar 1981). The low floatability of coarse particles is mainly due to the particle-detachment from bubbles as a result of turbulence within the pulp and upon hitting the pulp-froth interface (Schulze 1977, Crawford and Ralston 1988, Vera et al 1999, Seaman et al 2006). In addition, increasing the particle size may result in longer induction times that affect attachment efficiency and a commensurate deterioration in floatability (Feng and Aldrich 1999).…”

Section: Particle Size Distribution and Its Effect On Flotationmentioning

confidence: 99%

The effect of regrinding chemistry and particle breakage mechanisms on subsequent cleaner flotation

Chen¹

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Regrinding rougher flotation concentrates is typically used to liberate valuable minerals from gangue prior to the cleaner separation stage in processing of low grade ores. Compared to the rougher flotation after primary grinding, it is usually more challenging to achieve a satisfactory performance in post-regrind cleaner flotation especially when fine particles are generated. One main factor which results in this reduction in flotation is the unsuitable particle surfaces produced after regrinding. However, this factor is not usually considered when designing and optimizing the regrinding process.Extensive studies have demonstrated that grinding chemistry can influence mineral floatability.However, earlier studies focused on primary grinding and rougher flotation rather than regrinding and cleaner flotation. In addition, different types of regrind mills are used in industry, and these provide different particle breakage mechanisms which may also influence mineral floatability.Therefore, the overall objective of this thesis study is to investigate the effects of regrinding chemistry and particle breakage mechanisms on the cleaner flotation. The implementation of regrinding in the copper and pyrite flotation circuits at Telfer gold mine was taken as a case study and four research areas were addressed with the objective of developing fundamental understanding to provide practical guidance for the plant operation. The four areas investigated are:1. Effect of regrinding chemistry on copper activation of pyrite and its flotation; 2. Separation of different copper sulphide minerals from pyrite after regrinding; 3. Importance of pulp chemistry during regrinding rougher concentrates; 4. Effect of particle breakage mechanisms on subsequent flotation.In this study, it was found that copper activation of pyrite and its flotation in the cleaner stage were affected by regrinding. In general, a decrease in surface concentration of collectors due to the increased surface area after regrinding contributed to the low pyrite recovery in the cleaner. Surface analysis revealed that both the surfaces that were carried from the rougher flotation concentrate and those which were freshly created were modified by the strong electrochemical reactions occurring inside the regrind mill. Stainless steel media promoted pyrite oxidation, especially on the copper activated surfaces. Mild steel media produced a greater amount of iron oxidation species which could adsorb on the carried surfaces. It was also found that mild steel media generated a reducing condition which favoured the copper activation on the freshly created surfaces.ii The research has also shown that the separability of chalcopyrite and chalcocite from pyrite was significantly different after regrinding, which was related to their electrochemical properties.Chalcocite was more active and therefore presented a stronger galvanic interaction with pyrite.Consequently chalcocite was more oxidised, which not only depressed its flotation but also produced sufficient copper ions...

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Selective transport of attached particles across the pulp–froth interface

Cited by 48 publications

References 21 publications

Determining the significance of flotation variables on froth rheology using a central composite rotatable design

Determining the significance of flotation variables on froth rheology using a central composite rotatable design

The effect of mineral grain textures at particle surfaces on flotation response

The effect of regrinding chemistry and particle breakage mechanisms on subsequent cleaner flotation

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