Minerals engineering : an international journal devoted to innovation and developments in mineral processing and extractive metallurgy, Vol. 23 N° 11-13. Minerals engineering - Octobre 2010
| Titre : | Minerals engineering : an international journal devoted to innovation and developments in mineral processing and extractive metallurgy, Vol. 23 N° 11-13. Minerals engineering - Octobre 2010 |
| Type de document : | Bulletin |
| Paru le : | 11/12/2011 |
Dépouillements
Article : texte imprimé
The theoretical background for flotation kinetics of ultrafine and coarse particles are explored. Recent advances in flotation technology for these difficult areas are reviewed, with a focus on improving the flotation rate of ultrafines, and ext[...]
Article : texte imprimé
L. Rocha, Auteur ;
R. Z. L. Cançado, Auteur ;
A.E.C. Peres, Auteur
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This investigation addressed the processing of ultrafine tailings (slimes) from an iron ore concentrator via reverse cationic flotation to produce pellet feed fines, despite the traditional view that ultrafine particles do not float.
Following [...]
Article : texte imprimé
C. P. Brough, Auteur ;
D. J. Bradshaw, Auteur ;
M. Becker, Auteur
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At Northam Platinum Mine in South Africa intense potholing of the Merensky Reef has led to the development of several mineralogically different reef types in proximity to one other, which results in differing processing performance. In particula[...]
Article : texte imprimé
Martyn P. Hay, Auteur ;
Ravi Roy, Auteur
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In the Platinum Group Minerals (PGM) industry, almost all UG2 deposits being currently developed are deep level and bankable feasibility studies must rely entirely on batch testwork of borecore samples. Since UG2 has a significant chromite (FeO·[...]
Article : texte imprimé
In Part 1 of this 2 part series of papers the relationships between Platinum Group Metals (PGM), mass and water recovery and %Cr2O3 (as chromite) in concentrate were defined for laboratory, pilot and plant scales. The entrainment of chromite in [...]
Article : texte imprimé
J. Yianatos, Auteur ;
F. Contreras, Auteur ;
P. Morales, Auteur
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Planning industrial flotation operation and earlier flotation equipment sizing are commonly based on batch flotation testing, where ideal operating conditions can be provided. Each plant has its own batch flotation standards and typically uses a[...]
Article : texte imprimé
Article : texte imprimé
J. Leiva, Auteur ;
L. Vinnett, Auteur ;
F. Contreras, Auteur
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The bubble surface area flux, SB, defined as the ration between the superficial gas rate JG and the Sauter mean bubble diameter D32, has been widely used to describe the gas phase dispersion efficiency in flotation machines, and from this predic[...]
Article : texte imprimé
Article : texte imprimé
Z. Ekmekçi, Auteur ;
M. Becker, Auteur ;
E. Bagci Tekes, Auteur
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The non-stoichiometric sulfide mineral pyrrhotite (Fe(1−x)S), common to many nickel ore deposits, occurs in differing crystallographic forms and compositions. The processing of pyrrhotite from these ores through froth flotation is based on the s[...]
Article : texte imprimé
Tomi Maksimainen, Auteur ;
Saija Luukkanen, Auteur ;
Pekka Mörsky, Auteur
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The effects of grinding media and pulp chemistry may have significant effects on floatability of sulphide ores. Grinding in mild steel mill is suggested to cause reducing environment, galvanic interactions and formation of surface hydroxides whi[...]
Article : texte imprimé
K.C. Corin, Auteur ;
P.J. Harris, Auteur
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The Merensky reef in the Bushveld Complex is well-known to contain a number of platinum group elements (PGEs). These PGEs are strongly associated with the sulphide minerals found in the Merensky reef. In order to recover the PGEs from the Merens[...]
Article : texte imprimé
Elizaveta Burdukova, Auteur ;
Haihong Li, Auteur ;
Dee J. Bradshaw, Auteur
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Poly (N-isopropylacrylamide) (PNIPAM), a temperature responsive polymer, was tested for its potential use as a collector in a quartz flotation system. The effect of PNIPAM on the surface characteristics of quartz particles were studied using ind[...]
Article : texte imprimé
Robert G. Acres, Auteur ;
Sarah L. Harmer, Auteur ;
David A. Beattie, Auteur
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The surface species present on two pure chalcopyrite samples (one with a smooth fracture surface; one with a rough fracture surface) and one heterogeneous sample containing both chalcopyrite and pyrite have been studied using synchrotron X-ray p[...]
Article : texte imprimé
Ye, X., Auteur ;
S. Gredelj, Auteur ;
W. Skinner, Auteur
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Recent developments in large scale stirred milling technology using ceramic media have allowed its application to relatively coarse particle streams. Apart from benefits in grinding finer more efficiently, benefits may also be derived from the s[...]
Article : texte imprimé
N.O. Lotter, Auteur ;
D. J. Bradshaw, Auteur
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Mixtures of collectors have been widely used for many years in sulphide flotation, and a range of performance benefits have been reported for many different systems. The combinations of collector types have varied, as have the ratios that have b[...]
Article : texte imprimé
G.A. Hope, Auteur ;
R. Woods, Auteur ;
G.K. Parker, Auteur
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Vibrational spectroscopy and X-ray photoelectron spectroscopy (XPS) studies have been carried out to investigate the interaction of n-octanohydroxamic acid, acetohydroxamic acid and potassium hydrogen n-octanohydroxamate with a copper electrode,[...]
Article : texte imprimé
R. Schouwstra, Auteur ;
D. De Vaux, Auteur ;
P. Hey, Auteur
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The Gamsberg zinc deposit in the Northern Cape in South Africa has been the subject of a number of studies by Anglo American over the years. Two distinct ore types have been identified, namely pelitic and garnet-magnetite ore. The ore is charact[...]
Article : texte imprimé
C. W. Bakker, Auteur ;
C.J. Meyer, Auteur ;
D.A. Deglon, Auteur
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Certain fine particle and high solid concentration mineral slurries used in the froth flotation process have been shown to exhibit non-Newtonian rheologies, including a yield stress. The mixing characteristics of these fluids are often problemat[...]
Article : texte imprimé
Gijsbert Wierink, Auteur ;
Kari Heiskanen, Auteur
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Bubble–particle interaction in turbulent flow is a dynamic process by its very nature. Important flotation parameters such as air hold-up, bubble size distribution, and bubble–particle interaction are strongly influenced by the shape and behavio[...]
Article : texte imprimé
G. Morris, Auteur ;
S.J. Neethling, Auteur ;
J. J. Cilliers, Auteur
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A three-dimensional model of a single cubic particle in a thin liquid film has been developed using the Surface Evolver (Brakke, 1992) program. It has been used to investigate the effect of a particle’s contact angle on its energetically stable [...]
Article : texte imprimé
Agnieszka Mierczynska-Vasilev, Auteur ;
David A. Beattie, Auteur
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A carefully chosen selection of CMC polymers was used to probe the depression of talc and chalcopyrite and to highlight the effect of specific alterations of the bulk polymer chemistry on the power and selectivity of the depressants. In situ tap[...]
Article : texte imprimé
K. Hadler, Auteur ;
C.D. Smith, Auteur ;
J. J. Cilliers, Auteur
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In recent years, developments in control strategy for banks of flotation cells have included process control based on mass pull. Mass pull, or the flowrate of solids reporting to the concentrate, is affected by changes in froth structure and sta[...]
Article : texte imprimé
Seng How Kuan, Auteur ;
James A. Finch, Auteur
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The role of frother controlling bubble size and froth properties is reasonably well understood in the air–water system. A concern is how well this relates to the three-phase flotation condition. As a model hydrophobic solid talc was used. A colu[...]
Article : texte imprimé
J.G. Wiese, Auteur ;
P.J. Harris, Auteur ;
D. J. Bradshaw, Auteur
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High energy costs required to smelt low grade concentrates could be alleviated by the production of high grade concentrates. Obtaining maximum PGM recovery by the use of high dosages of polysaccharide depressants may be problematic in that a sig[...]
Article : texte imprimé
K.E. Cole, Auteur ;
G.D.M. Morris, Auteur ;
J. J. Cilliers, Auteur
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The stability of the thin films found in the froth phase of flotation plays an important role in the overall efficiency of the separation process. In turn, the physical behaviour of the particles attached to the films has a direct impact on the [...]
Article : texte imprimé
C.D. Smith, Auteur ;
K. Hadler, Auteur ;
J. J. Cilliers, Auteur
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Recent studies have shown that varying the distribution of a set volume of air to a flotation bank significantly affects the performance of the bank. To date, however, the volume of air to be distributed has usually been arbitrarily set as that [...]
Article : texte imprimé
J. Yianatos, Auteur ;
L. Bergh, Auteur ;
L. Vinnett, Auteur
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The batch flotation process has been commonly characterized assuming a flotation rate distribution function F(k), e.g.: Dirac delta, Rectangular, Gamma or Weibull functions. The identification of F(k) for the collection zone of continuous indust[...]
Article : texte imprimé
K.E. Cole, Auteur ;
K.E. Waters, Auteur ;
X. Fan, Auteur
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Previous research into particle motion in the froth zone has focussed on constructing detailed CFD models that describe the behaviour of particle classes with different properties; density, size and hydrophobicity. These models have been reasona[...]
Article : texte imprimé
Megan Becker, Auteur ;
Johan De Villiers, Auteur ;
Dee Bradshaw, Auteur
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The non-stoichiometric sulfide mineral pyrrhotite (Fe(1−x)S), common to many nickel ore deposits, occurs in different crystallographic forms and compositions. A series of pyrrhotite samples derived from Canada, South Africa and Botswana whose mi[...]
Article : texte imprimé
N.A. Palm, Auteur ;
N.J. Shackleton, Auteur ;
V. Malysiak, Auteur
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High Pressure Grinding Rollers (HPGR) are known to reduce energy consumption and wear costs and improve the throughput in the circuit. It has been suggested that they can also modify the liberation characteristics of the ore. In the present stud[...]
Article : texte imprimé
Md. Shahjahan Kaisar Alam Sarkar, Auteur ;
G.M. Evans, Auteur ;
S.W. Donne, Auteur
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A feature of electroflotation is the ability to create very fine bubbles, which are known to improve flotation performance of fine particles. This study was aimed at determining the hydrogen bubble size generated as a function of current density[...]
Article : texte imprimé
H.D.G. Turrer, Auteur ;
A.E.C. Peres, Auteur
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Iron ore concentration through flotation represents an important application of reagents in mineral processing. Nowadays all Brazilian iron ore concentrators use starch as iron oxides depressant. This study evaluated the application of other dep[...]
Article : texte imprimé
Jianhua Chen, Auteur ;
Ye Chen, Auteur ;
Zongwu Wei, Auteur
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Laboratory and industrial scale experiments were conducted to investigate the effect of tertiary dodecyl mercaptan (TDM) as a collector on the flotation of auriferous pyrite and arsenopyrite. The optimum recovery of gold associated with aurifero[...]
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