WO2001034304A1 - Systeme de mesure de l'ecoulement de la mousse - Google Patents

Systeme de mesure de l'ecoulement de la mousse Download PDF

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Publication number
WO2001034304A1
WO2001034304A1 PCT/US2000/030774 US0030774W WO0134304A1 WO 2001034304 A1 WO2001034304 A1 WO 2001034304A1 US 0030774 W US0030774 W US 0030774W WO 0134304 A1 WO0134304 A1 WO 0134304A1
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WO
WIPO (PCT)
Prior art keywords
froth
sensor
obstruction
launder
slurry
Prior art date
Application number
PCT/US2000/030774
Other languages
English (en)
Inventor
Lorin D. Redden
Hayward B. Oblad
Original Assignee
Baker Hughes Incorporated
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Baker Hughes Incorporated filed Critical Baker Hughes Incorporated
Priority to AU15909/01A priority Critical patent/AU1590901A/en
Publication of WO2001034304A1 publication Critical patent/WO2001034304A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B13/00—Control arrangements specially adapted for wet-separating apparatus or for dressing plant, using physical effects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/02—Froth-flotation processes
    • B03D1/028—Control and monitoring of flotation processes; computer models therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/08—Subsequent treatment of concentrated product
    • B03D1/082—Subsequent treatment of concentrated product of the froth product, e.g. washing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1443—Feed or discharge mechanisms for flotation tanks
    • B03D1/1462—Discharge mechanisms for the froth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/16—Flotation machines with impellers; Subaeration machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/24—Pneumatic
    • B03D1/247—Mixing gas and slurry in a device separate from the flotation tank, i.e. reactor-separator type
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/52—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring the height of the fluid level due to the lifting power of the fluid flow
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/08—Air or gas separators in combination with liquid meters; Liquid separators in combination with gas-meters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/296—Acoustic waves

Definitions

  • This invention relates to froth flotation cells and other devices and processes where the separation of valuable chemical or mineral species from undesirable chemical or mineral species involves the production of a froth. More specifically, this invention relates to an apparatus and method for use in estimating or measuring a rate of froth flow in a slurry-processing recovery apparatus.
  • Froth flotation cells are used to separate mineral values from mineral wastes. An ore is finely ground and suspended as a water-based slurry or pulp in a flotation cell. An impeller or rotor is turned at a high speed in the slurry to suspend the mineral particulates and distribute or disperse air bubbles into the slurry. The mineral values attach to the air bubbles.
  • the bubbles with the entrained mineral values then rise to form a froth atop the pulp or slurry pool.
  • the froth overflows a weir and is collected in a launder for further processing.
  • Examples of flotation cells are described in U.S. Patent No. 5,611 ,917 to Degner, U.S. Patent No. 4,737,272 to Szatkowski et al., U.S. Patent No. 3,993,563 to Degner, U.S. Patent No. 5,219,467 to Nyman et al., U.S. Patent No. 5,251 ,764 to Niitti et al., and U.S. Patent No. 5,039,400 to Kallioinen et al.
  • air is supplied to the pulp or slurry via a separate pumping mechanism.
  • the froth product of a flotation cell is normally highly aerated, bubbly, and of very low density.
  • the mineral particulates entrained in the froth may be a valuable mineral species.
  • the collected particles are transported to the surface of the slurry by gaseous bubbles.
  • the froth builds above the upper edges of the slurry container and overflows into the launder or gutter.
  • the froth flows down the sloped bottom panels of the launders and into a pipe for transport to another processing step.
  • the froth is partially coalesced with additional water that is poured or sometimes sprayed into the launder. The water improves froth mobility and partially deaerates it.
  • the present invention is directed to a method and apparatus for estimating the flow rate of froth or gas/ solid/ liquid mixtures.
  • the apparatus and method can be used readily to determine short duration changes in froth flows and therefore to detect improvements in froth formation and recovery in machines like froth flotation cells.
  • a froth flow rate is estimated in accordance with the present invention by detecting a froth level or, more generally, a position of a froth-air interface, at a froth output of a slurry-processing recovery apparatus.
  • the invention recognizes that a greater froth flow rate from a slurry-processing recovery apparatus will result, in appropriate circumstances, in a higher level or a wider froth flow at an output of the apparatus.
  • the exiting froth falls from the launder into a guide channel, chute or pipe which directs the froth away from the slurry-processing recovery apparatus for further processing.
  • a froth level sensor is positioned along the guide channel, chute or pipe for detecting the position of a froth-air interface and thus provide at least a qualitative measurement useful for a feedback-type control.
  • the level sensor may be positioned vertically over a chute or vertically over a horizontal section of pipe through which the froth output flows.
  • the sensor may be disposed at an angle to the vertical, for example, at the point of entry into the guide channel from the launder.
  • the sensor is preferably positioned close to the froth flotation cell to protect the sensor from accidental impacts, but far enough away to minimize the effects of turbulence in the froth.
  • the sensor should not be positioned so far downstream from the launder that the air in the froth is significantly reduced.
  • a froth level sensor is used to measure the position of a froth-air interface at the point of entry into the guide channel from the launder.
  • the thickness of the froth flow similarly varies as a function of the froth flow rate and momentum.
  • the froth level sensor preferably takes the form of a wave energy
  • This ultrasonic sensor is disposed along a froth flow path defined by the guide and measures a distance between the sensor and the froth level or froth-air interface at the launder-guide junction and the sensor.
  • the distance between the sensor and the froth level or froth-air interface at the launder-guide junction is inversely related to the froth flow rate.
  • an obstruction or flow restriction is disposed in the froth flow guide.
  • the froth level sensor measures the height of a froth column or volume disposed above the obstruction.
  • the flow restriction impedes froth flow above or upstream of the obstruction so that the froth backs up there.
  • the extent to which the froth backs up is an indicator of the pressure drop at the restriction and therefore an indicator of the flow rate through the restrictor.
  • the extent of the backup is preferably measured also by an ultrasonic pressure wave generator/detector. This ultrasonic sensor is disposed above the froth flow guide to determine the location of an upper froth level and therefore the height of the froth column or volume above the restriction.
  • the sensor assembly operates in a manner similar to the well-known venturi meter and its permutations such as the orifice meter.
  • the greater the flow the greater the pressure drop which is created and the higher the hydrostatic head required to overcome the pressure drop.
  • the flow rate through a restriction is proportional to the square root of the pressure drop across the restriction. If the height of a vertical section of fluid above the restriction doubles, the flow rate is greater by roughly 40%. (The square root of two is approximately 1.4.) Since a froth contains a gas such as air, solid particulates, and a liquid such as water, the ideal relationship between the froth flow rate and the vertical height of the fluid will vary with composition. However, under the proper operating conditions, the froth will have a relatively repeated consistency by the time it flows into the outlet guide pipe.
  • Venturis are characterized by a change in cross-sectional area of the pipe through which the fluid passes.
  • the fluid When a fluid passes from a large diameter pipe section into a smaller one, the fluid must increase in density or velocity. Incompressible fluids always move faster. The increase in fluid velocity causes the pressure within the smaller diameter pipe section to decrease. Thus, a pressure differential is created and can be measured.
  • the slope of the pipe section between the larger and the smaller diameter sections can be chosen to be very long and tapered or cone shaped.
  • the change in the inner dimension of the pipe may be as abrupt as a perpendicular plate with a hole in the center. In the latter case, the plate is called an orifice plate and such devices are commonly used to measure fluid flow.
  • any taper may be used.
  • the pressure differential is measured by tapping holes in the larger and smaller diameter pipe sections and comparing pressures measured at the holes.
  • the froth flow rate is inferred from the height of the fluid that accumulates upstream of and above the flow restriction.
  • the operating range of the flow rate measurement may be expanded by lengthening the vertical section of pipe or by installing a variable restrictor, for example, in the form of a pinch valve or a "muscle" valve. Both valves have elastomeric elements advantageous in slurry servicing.
  • the height of the froth in the vertical leg or pipe section above the flow restriction can be maintained constant by opening or closing the flow restrictor until the flow through the restriction is balanced by the head pressure of the fluid.
  • a common control or feedback loop could be used to adjust the restrictor until the height measurement of the fluid column is at the desired value. Any combination of tapered, flat plate, and variable flow restrictors may be used.
  • the present invention provides a method and apparatus which facilitates optimal operation of a slurry- processing recovery apparatus such as a froth flotation cell by providing a real-time automatic measurement which is related to a froth flow rate at an output of the slurry-processing recovery apparatus.
  • This quantitative measurement may be used by an operator to adjust one or more operating parameters of the slurry-processing recovery apparatus to maintain the operation of the apparatus within an optimal operating range. For example, where the detected froth level exceeds a pre-established threshold, the operating parameters of the slurry-processing recovery apparatus are adjusted to reduce the production of froth. Where the detected froth level falls below another pre-established threshold, the operating parameters of the slurry- processing recovery apparatus are adjusted to increase the production of froth.
  • the quantitative froth level measurement made in accordance with the present invention may be fed to an expert control or programmer along with other detector inputs.
  • the control or programmer then automatically modifies one or more operating parameters pursuant to a preprogrammed instruction set.
  • Fig. 1 is a schematic cross-sectional view of a froth flotation cell, showing an obstruction or restriction in a froth outlet pipe and a sensor for measuring a height of a column of froth above the restriction in accordance with the present invention.
  • Fig. 2 is a schematic cross-sectional view similar to Fig. 1 , showing a tapered froth outlet pipe and a sensor for measuring a height of a column of froth in the tapered outlet pipe in accordance with the present invention.
  • Fig. 3 is a schematic cross-sectional view similar to Figs. 1 and 2, showing an adjustable obstruction or restriction in a froth outlet pipe and a sensor for measuring a height of a column of froth above the restriction in accordance with the present invention.
  • Fig. 4 is a diagram of an assembly for measuring a froth level at an outlet of a radial launder in a froth flotation cell, in accordance with the present invention.
  • Fig. 5 is a schematic see-through perspective view of a tank and a launder of a froth flotation cell, showing a low level of froth in the launder.
  • Fig. 6 is a view similar to Fig. 5, showing an intermediate level of froth in the circumferential or perimetral launder.
  • Fig. 7 is a view similar to Figs. 5 and 6, showing a high level of froth in the circumferential or perimetral launder.
  • a froth flotation cell comprises a rotor assembly 10 rotatably disposed in a tank 12 for pumping a pulp phase or slurry together with air to thereby mix the air into the 2-phase pulp, generating a froth or bubble mass 20 which floats atop a pulp mass or slurry pool 22 in the tank.
  • Rotor assembly 10 includes a mixing structure in the form of a rotor or impeller 14 comprising a plurality of vertical vanes or propeller blades 16 disposed in a cylindrical configuration about a rotation axis 18.
  • Impeller 14 is operatively connected to a motor 24 via a drive shaft 26, transmission belts 28 and sheaves 30 and 32.
  • a ⁇ otor 24 is supported on tank 12 via a mechanism stand (not shown) and a base plate and standpipe (not shown), while transmission belts 28 and sheaves 30 and 32 are covered by a belt guard (not shown).
  • a bearing housing 34 surrounds drive shaft 26 along an upper portion thereof.
  • Flotation cell tank 12 is provided along an upper end thereof with a froth overflow weir or launder 36 which receives froth 20 and channels it away from the flotation cell.
  • Nozzle elements 38 are provided for spray washing froth 20 in launder 38.
  • Launder 36 is connected at a downstream end to a pipe 40 which guides froth 20 along a froth flow path 42 away from the flotation cell for further processing.
  • a flow restrictor in the form of an orifice plate 44 is provided in pipe 40 and results in a pressure head or froth column 46 having a height H1 which depends directly on the rate of froth flow from the flotation cell.
  • An ultrasonic sensor 48 is disposed above pipe 40 for determining the location of an upper froth level or froth-air interface 50 and concomitantly determining the height H1 of froth column or volume 46. Height H1 is directly related to the froth flow rate along path 42. The greater the flow rate, the higher column 46. Concomitantly, a distance D1 between sensor 48 and froth level or froth-air interface 50 varies inversely as the froth flow rate from launder 36. The greater the froth flow rate, the smaller the distance D1.
  • Sensor 48 is connected to a display 52 which provides a visual readout for an operator.
  • Display 52 and/or sensor 48 may be provided with processing circuitry (not shown), either hardwired or a microprocessor, for converting the raw data from sensor 48 into a signal controlling the display to indicate either height H1 or distance D1 .
  • the operator can use this information to determine whether adjustment in an operating parameter of the flotation cell is necessary in order to maintain froth flow within an optimal range.
  • the modifiable parameters include the rotation rate of impeller 14 and the rate of slurry feed to tank 12.
  • sensor 48 is connected to a programmer or expert control 54 exemplarily in the form of a microprocessor in turn operatively connected at an output to motor 24 for varying the rotation rate thereof in response to the froth level feedback data from sensor 48.
  • programmer or microprocessor control 54 may be connected at an output to a valve 56 for adjusting a rate of slurry feed to tank 10 in response to the froth level feedback data from sensor 48.
  • Fig. 2 depicts a modification of the apparatus of Fig. 1 .
  • Reference numerals from Fig. 1 have been used in Fig. 2 to designate the same structures.
  • a flow restrictor in the form of a tapered or conical pipe section 58 is provided at an upper or upstream end of a froth guide pipe 60 and results in a pressure head or froth column 62 having a height H2 which depends directly on the rate of froth flow from the flotation cell.
  • Ultrasonic sensor 48 is disposed above pipe 60 for determining the location of an upper froth level or froth-air interface 64 and concomitantly determining the height H2 of froth column or volume 62.
  • Height H2 is directly related to the froth flow rate along path 42.
  • a distance D2 between sensor 48 and froth level or froth-air interface 64 varies inversely as the froth flow rate from launder 36. The greater the froth flow rate, the smaller the distance D2.
  • Fig. 3 depicts a modification of the apparatus of Fig. 1 or 2, wherein the setting of an optimal froth column reference height H3 is facilitated.
  • Reference numerals from Figs. 1 and 2 have been used in Fig. 3 to designate the same structures.
  • pipe 40 is provided with an adjustable flow restrictor 66 for creating an aperture or orifice 68 of variable size.
  • Restrictor 66 may take the form of a pinch valve or a "muscle" valve. Both valves have elastomeric elements advantageous in slurry servicing.
  • Ultrasonic sensor 48 is connected to a display component 70 which is provided with a microprocessor or hard-wired control circuits (not separately illustrated) operatively connected to a driver element 72.
  • Driver element 72 operates restrictor 66 in response to control signals from the microprocessor or hard-wired control circuits incorporated in display component 70. More specifically, driver element 72 is controlled to adjust the size of aperture or orifice 68 so that a column 74 of froth above restrictor 66 attains a predetermined H3 at optimal operating conditions of the froth flotation cell.
  • the control microprocessor or programmer in display component 70 automatically adjusts operating parameters such as impeller speed and slurry input rate in response to feedback from ultrasonic sensor 48.
  • Ultrasonic sensor 48 is of conventional form and includes a pressure wave generator and a pressure wave detector for sensing incoming reflected waves.
  • a froth flotation cell has a radial launder 76 connected at an outlet 78 to a peripheral launder 80.
  • An ultrasonic sensor 82 is connected to a tank wall 84 via mounting components 85 at or about the outlet 78 of radial launder 76 so that ultrasonic pressure waves 86 generated by the sensor are transmitted through the ambient air to froth 88 flowing along a path (not designated) from radial launder 76 to peripheral launder 80. At least some of the ultrasonic pressure waves 86 impinging on a froth level or froth-air interface 90 are reflected thereby and return to sensor 82, as indicated at 92.
  • Sensor 82 or a controller or programmer 94 connected thereto determines a distance D' between sensor 82 and the froth level or froth-air interface 90. Concomitantly, controller or programmer 94 determines a width or thickness dimension W of the froth flow entering peripheral launder 80 from radial launder 76. Generally, width or thickness dimension W varies as a direct function of froth flow rate or momentum. The faster the froth flow rate and the greater the momentum of the froth, the flatter the trajectory of the froth flow at outlet 78 of launder 76 and the greater the width or thickness dimension W.
  • controller or programmer 94 may be connected to motor 24 and/or a valve 56 for automatically varying operating parameters of the froth flotation cell in response to detected variation in distance D' or width W of froth flow 88.
  • display 52 may indicate a numerical value which enables an operator to manually effectuate an adjustment of one or more operating parameters. Where the froth flow rate is high, as at 96, the operating parameters are adjusted to decrease froth production. Where the froth flow rate is low, as at 98, the operating parameters are modified so that froth production increases.
  • a froth flotation cell comprises a tank 102 having a circumferential launder 104 and an ultrasonic sensor 106 disposed above the launder for measuring the vertical position or level of froth in the launder.
  • Launder 104 is connected to an outlet pipe 108 through which exiting froth flows, as indicated by an arrow 110.
  • Fig. 5 shows a low level 1 12 of froth, associated with a low froth flow rate.
  • Fig. 6 depicts an intermediate level 114 of froth, while Fig. 7 shows a high level 116 of froth, the result of a high froth flow rate.
  • a measurement of output froth level to provide an estimate of froth flow rate pursuant to the present invention may be made by detectors other than ultrasonic sensors.
  • detectors other than ultrasonic sensors.
  • One such detector is an optical sensor such as a camera or charge-coupled device connected to a computer for comparing the froth level with a scale disposed along to the froth flow path.
  • Another type of sensor utilizable in the present method is a capacitance probe.
  • the present invention may be utilized in slurry processing devices other than froth flotation cells to separate valuable chemical or mineral species from undesirable chemical or mineral species.
  • the processing device may be a pipe without a mechanical mixer, air or other gas being bubbled into the base of a liquid column to generate froth.
  • Target chemical species other than minerals may include inks, separated from paper in a froth production process, or fats, separated from carbohydrates and other organic components.
  • a froth level sensor or forth-air interface detector In accordance with the present invention may be positioned at virtually any location along the path of the froth, i.e., at any location along a froth guide extending from a flotation cell or other producer of froth.
  • guide as used herein in connection with froth is intended to denote any froth flow structure which directs froth away from the flotation cell.
  • a froth guide may take the form of or include a channel, a chute and/or a pipe which directs the froth away from the slurry-processing recovery apparatus for further processing.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biotechnology (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Thermal Sciences (AREA)
  • Electromagnetism (AREA)
  • Acoustics & Sound (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

L'invention concerne un procédé permettant de détecter la vitesse d'écoulement de la mousse dans un récupérateur pour traitement des boues, tel qu'une cellule de flottation par mousse (12), un capteur (48) placé le long du passage d'écoulement (42) de la mousse s'étendant depuis un orifice d'évacuation de l'appareil est activé afin de déterminer l'emplacement de l'interface (50) mousse-air le long dudit passage d'écoulement (42). L'emplacement de ladite interface (50), autrement dit le niveau de la mousse, est lié à la vitesse de production de mousse; il permet de commander rétroactivement les paramètres de fonctionnement de la cellule de flottation (12) de manière à maintenir le fonctionnement de ladite cellule à un niveau optimal.
PCT/US2000/030774 1999-11-12 2000-11-02 Systeme de mesure de l'ecoulement de la mousse WO2001034304A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU15909/01A AU1590901A (en) 1999-11-12 2000-11-02 Froth flow measurement system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US16507399P 1999-11-12 1999-11-12
US60/165,073 1999-11-12

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Publication Number Publication Date
WO2001034304A1 true WO2001034304A1 (fr) 2001-05-17

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004080600A1 (fr) 2003-03-13 2004-09-23 Technological Resources Pty Limited Mesure de stabilité de mousse
WO2008061289A1 (fr) * 2006-11-22 2008-05-29 The University Of Queensland Procédé et appareil de surveillance d'une phase mousseuse
WO2014188232A1 (fr) * 2013-05-23 2014-11-27 Dpsms Tecnologia E Inovação Em Mineração Ltda Système automatique de colonnes de flottation par mousse avec buses d'injection d'aérateurs et procédé

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US5062964A (en) * 1989-04-07 1991-11-05 J. M. Voith Gmbh Process for control of a flotation system
US5073253A (en) * 1990-07-11 1991-12-17 Phillips Petroleum Company Froth level measurement
US5330655A (en) * 1992-07-30 1994-07-19 J.M. Voith Gmbh Method of regulating a flotation system with a primary and secondary stage
WO1997045203A1 (fr) * 1996-05-31 1997-12-04 Baker Hughes Incorporated Procede et appareil de commande de machines de flottation

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5057211A (en) * 1988-12-19 1991-10-15 Baummer George P Benefication apparatus and process for land and seabed mining
US5062964A (en) * 1989-04-07 1991-11-05 J. M. Voith Gmbh Process for control of a flotation system
US5073253A (en) * 1990-07-11 1991-12-17 Phillips Petroleum Company Froth level measurement
US5330655A (en) * 1992-07-30 1994-07-19 J.M. Voith Gmbh Method of regulating a flotation system with a primary and secondary stage
WO1997045203A1 (fr) * 1996-05-31 1997-12-04 Baker Hughes Incorporated Procede et appareil de commande de machines de flottation

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004080600A1 (fr) 2003-03-13 2004-09-23 Technological Resources Pty Limited Mesure de stabilité de mousse
EP1613434A1 (fr) * 2003-03-13 2006-01-11 Technological Resources Pty. Ltd. Mesure de stabilite de mousse
EP1613434A4 (fr) * 2003-03-13 2007-07-04 Tech Resources Pty Ltd Mesure de stabilite de mousse
WO2008061289A1 (fr) * 2006-11-22 2008-05-29 The University Of Queensland Procédé et appareil de surveillance d'une phase mousseuse
WO2014188232A1 (fr) * 2013-05-23 2014-11-27 Dpsms Tecnologia E Inovação Em Mineração Ltda Système automatique de colonnes de flottation par mousse avec buses d'injection d'aérateurs et procédé

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