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Method for enhancing selectivity and recovery in the
The U S Department of Energy s Office of Scientific and Technical Information
Column flotation frothsCORE
Abstract A fundamental study on the behaviour of flotation column froths is presented Three main aspects were considered hydrodynamic cleaning rejection of hydraulically entrained particles and selectivity separation between particles of different hydrophobicity lumn froth hydrodynamics were studied in a two phase gas liquid system
Selectivity in column flotation frothsScienceDirect
Selectivity in the froth zone of two industrial flotation columns in a Mo cleaning circuit has been studied and modelled Froth depth is shown to be a significant factor Froths deeper than 1 m gave selective recovery of Mo with upgrading of 10–15 absolute
Selective detachment process in column flotation froth
Selective detachment process in column flotation froth Minerals Engineering 2006 Rick Honaker B Parekh Rick Honaker B Parekh Download PDF Download Full PDF Package This paper A short summary of this paper 37 Full PDFs related to this paper READ PAPER
Column FlotationJim A Finch Glenn Stephen Dobby
Column Flotation covers both fundamental and applied aspects Following an examination of the properties of the collection and froth zones there is detailed treatment of cleaning and selectivity focussing on their dependence on operating variables
The froth stability column linking froth stability and
It is found that the froth stability column is an accurate and cost effective method for quantifying froth stability and for indicating changes in flotation performance ABFroth structure and stability are known to play important roles in determining mineral flotation recovery and selectivity
OPTIMIZATION OF AIR INJECTION SPARGERS FOR
of the column improves selectivity by washing undesirable material that may get hydraulically entrained into the froth phase A mayor constraint on column flotation capacity is froth overloading The carrying capacity of the froth depends on the bubble surface area available for
Enhancement in Selectivity of Coking Coal Flotation by
Enhancement in Selectivity of Coking Coal Flotation by Ultrasound Simultaneous Treatment Yijiang Li Wencheng In addition the application of flotation column in coal separation can effectively reduce the clean coal ash content 10 11 rate was 250 ml/min and the flotation froth was collected at 10s 30s 60s 120s and 180s
Froth Flotation Machines911metallurgist
Higher Flotation Selectivity Super aerated pulp results in a highly selective flotation condition The complete dispersion within the pulp allows for more thorough rejection of gangue and slime The deeper froth column is a factor in selectivity between the mineral to
Deinking selectivity Z factor a new parameter to
separate control of froth stability to increase fiber yield and optimize ink removal in deinking of toner printed papers in a laboratory column flotation cell 4 This concept was later successfully demonstrated using a mixture of old newsprint ONP and old magazine OMG furnishin a pilot scale com mercial flotation cell 22
Column Flotation Testing Better Improved Recovery
The advantages of column flotation include improved energy efficiency utilization of natural settling and separation reduced turbulence in the flotation cell and closer control of critical flotation parameters such as bubble size cell air content airflow retention time froth depth and froth cleaning
Up scaling of froth flotation equipment
Flotation rate constant Constant describing the rate at which the concerning mineral or metal is recovered in the flotation process Froth zone Zone in the top of the flotation cell consisting of froth loaded with mainly valuable minerals which provides extra separation between valuable minerals and gangue minerals
AN IN PLANT EVALUATION OF FROTH WASHING ON
Column flotation cells have become increasingly popular in the coal industry due to their ability to improve flotation selectivity The improvement can be largely attributed to the use of froth washing which minimizes the nonselective entrainment of ultrafine minerals matter into the froth product Unfortunately the practice of adding
PDF Optimisation of flotation pulp selectivity utilising
The froth depth is kept to a minimum in all tests so that differences can be attributed to changes in pulp flotation kinetics rather than to any change in the flotation froth performance The experimental feed and product mineral recovery rates or mineral selectivity curves derived from these tests can be compared directly when there is only one
Comparison of column flotation cells Conference OSTI GOV
A comparison of the test results indicates differences in the selectivity obtained by each flotation column on the basis of both ash and sulfur rejection This finding may be due to variations in cell hydrodynamics and the ability to support a deep froth phase among the different column cells In addition throughput capacity of each cell was
Selection of the best route for column configuration in an
Keywords column flotation sulphide ores distribution of wash water airflow rate froth height 1 Introduction The flotation process is often referred to as a highly complex process because it is affected by many parameters at different rates Selectivity of chemical regime appropriate circuit design and
in column flotation frothstrampolina zabawy
Column Flotation BIAS911metallurgist Abstract A fundamental study on the behaviour of flotation column froths is presented Three main aspects were considered hydrodynamic cleaning rejection of hydraulically entrained particles and selectivity separation between particles of different hydrophobicity lumn froth hydrodynamics were studied in a two phase gas liquid system
Selectivity and power of frothers in copper ore flotation
Selection of a proper frother in flotation depends on the material used necessary dose of frother and its selectivity The selectivity of flotation can be characterized by proper separation factors and indices In this paper separation selectivity and power of frothers were evaluated basing on
Evaluation of the selective detachment process in
A flotation column was constructed that employs a unique design to separate the froth and pulp during continuous operation The column was split at the froth pulp interface as shown in Fig 3 so that instantaneous separation of the froth and pulp phases could successfully be achieved The flotation column also incorporates the ability to provide instantaneous stoppage of the process streams by using solenoid valves after ensuring steady state operation of the column
OPTIMIZATION OF AIR INJECTION SPARGERS FOR
of the column improves selectivity by washing undesirable material that may get hydraulically entrained into the froth phase A mayor constraint on column flotation capacity is froth overloading The carrying capacity of the froth depends on the bubble surface area available for
Column FlotationSGS
Today column flotation has become an accepted means of froth flotation for a fairly broad range of applications in particular the cleaning of sulfides copper zinc lead and molybdenite and the flotation of iron ore phosphate and coal Flotation columns differ dramatically from mechanical flotation machines in
Selective Detachment Process in Column Flotation Froth
Selective Detachment Process in Column Flotation Froth The selectivity in flotation columns involving the separation of particles of varying degrees of floatability is based on differential flotation rates in the collection zone reflux action between the froth and collection zones and differential detachment rates in the froth
Column Flotation Model Overview911metallurgist
With the advent of column flotation in the early 1980s research funds were made available to study column flotation Models began to evolve to describe the column cell froth zone and these were later applied flotation cells in general Lynch 1981 associated the recovery of hydrophilic particles with water recovery to the concentrate
Improvement of the Flotation Selectivity in a Mechanical
The results also indicate that a pronounced selectivity effect was obtained from the ultrasonic flotation of both barite and chalcopyrite The use of ultrasound in the froth remarkably improves the quality of the chalcopyrite concentrate especially at the shallow froths
Flotation Column A Process Unit for Cleaning Up Paper
This study was performed on a laboratory scale flotation column built at FPInnovations Paprican 20 The column shown in Figure 1 has a 10 2 cm diameter and a height of 4 65 m The principle of the flotation column is simple The pulp slurry which is fed just underneath the froth level descends in the column counter current to the raising
Selectivity and power of frothers in copper ore flotation
Froth flotation is widely used for upgrading of ores and other materials Efficiency of flotation depends on many parameters including type chemical structure and dose of flotation reagents Selection of a proper frother in flotation depends on the material used necessary dose of frother and its selectivity
Selective detachment process in column flotation froth
The selectivity in flotation columns involving the separation of particles of varying degrees of floatability is based on differential flotation rates in the collection zone reflux action between the froth and collection zones and differential detachment rates in the froth zone
Evaluation of Frother Types for Improved Flotation
while an unstable froth is least desirable due to the negative e ect on recovery and selectivity 25 The frothers that are more e cient in reducing bubble size have been observed to produce more stable foams 6–8 13 Laskowski 26 was able to characterize frothers based on their ability to reduce bubble size and increase froth stability
Column Flotation
Froth washing Column flotation produces very well defined deep and stable froth layers that are washed with the application of percolating water from above displacing gangue particles such as silicates and carbonates Thorough washing results in superior final product quality Aspect ratio
Column Flotation CellsMineral Processing Metallurgy
Column flotation cells like mechanical cells are used to perform mineral separations Column cells do not use mechanical agitation impellers Instead mixing is achieved by the turbulence provided by the rising bubbles Columns are mostly used to produce final grade concentrates because they are capable of high selectivity
Column Flotation Theory and Practice
FROTH FLOTATION RECENT TRENDS cr lIME JAMSHEDPUR 1998 pp 44 63 Column Flotation Theory and Practice S R S SASTR I Regional Research Laboratory Bhubaneswar751 013 ABSTRACT Column flotation which employs a counter current flow of slurry and air bubbles has proved to be a better alternative to the
The froth stability column linking froth stability and
The froth stability column is based on the dynamic stability test for non overflowing froth columns originally proposed by Bikerman 1973 Measurements are carried out using a vertical column which is inserted through the froth to below the pulp–froth interface in the flotation cell adequately low to avoid froth leakage from the bottom
Cell Column Flotation Launderrichstyleagent
Cell Column Flotation Launder An in plant evaluation of froth washing on keywords coal flotation wash water conventional flotation cell abstract column flotation cells have become increasingly popular in the coal industry due to their ability to improve flotation selectivity the improvement can be largely attributed to the use of froth washing which minimizes the nonselective
Evaluation of Frother Types for Improved Flotation
minerals Article Evaluation of Frother Types for Improved Flotation Recovery and Selectivity Qingqing Huang 1 Xinbo Yang 2 and Rick Q Honaker 2 1 Department of Mining Engineering West Virginia University Morgantown WV 26506 USA 2 Department of Mining Engineering University of Kentucky Lexington KY 40508 USA xinbo yang uky edu X Y rick honaker uky edu R Q H
Column FlotationSGS
column froth is usually very stable even when deep an industrial column froth is typically 0 6 1 0 m deep The wash water stream/droplets must be large enough to penetrate the top layer of the froth because the washing action takes place primarily at the froth/pulp interface Yianatos Finch and Laplante 1987 If the water stream is too light
Selectivity in column flotation froths Semantic Scholar
Abstract Selectivity in the froth zone of two industrial flotation columns in a Mo cleaning circuit has been studied and modelled Froth depth is shown to be a significant factor Froths deeper than 1 m gave selective recovery of Mo with upgrading of 10–15 absolute Froths less than 50 cm showed no selectivity