WO2004109240A2 - Mass flow metering systems - Google Patents

Mass flow metering systems Download PDF

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Publication number
WO2004109240A2
WO2004109240A2 PCT/IB2004/050847 IB2004050847W WO2004109240A2 WO 2004109240 A2 WO2004109240 A2 WO 2004109240A2 IB 2004050847 W IB2004050847 W IB 2004050847W WO 2004109240 A2 WO2004109240 A2 WO 2004109240A2
Authority
WO
WIPO (PCT)
Prior art keywords
mass flow
metered
slurry
metering system
flow metering
Prior art date
Application number
PCT/IB2004/050847
Other languages
French (fr)
Other versions
WO2004109240A3 (en
Inventor
Theo Cornelius Van Schalkwyk
Roger Gordon Leighton
Stuart Turner
Michael Sean Bell
Original Assignee
Anglo American Platinum Corporation Limited
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 Anglo American Platinum Corporation Limited filed Critical Anglo American Platinum Corporation Limited
Publication of WO2004109240A2 publication Critical patent/WO2004109240A2/en
Publication of WO2004109240A3 publication Critical patent/WO2004109240A3/en

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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
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/02—Froth-flotation processes
    • B03D1/028—Control and monitoring of flotation processes; computer models therefor
    • 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
    • G01F1/007—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 measuring the level variations of storage tanks relative to the time
    • 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
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F11/00—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it
    • G01F11/28—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with stationary measuring chambers having constant volume during measurement
    • G01F11/284—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with stationary measuring chambers having constant volume during measurement combined with electric level detecting means
    • 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
    • G01F23/2966—Acoustic waves making use of acoustical resonance or standing waves
    • G01F23/2967—Acoustic waves making use of acoustical resonance or standing waves for discrete levels
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F3/00—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow
    • G01F3/36—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with stationary measuring chambers having constant volume during measurement
    • G01F3/38—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with stationary measuring chambers having constant volume during measurement having only one measuring chamber
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G13/00—Weighing apparatus with automatic feed or discharge for weighing-out batches of material
    • G01G13/16—Means for automatically discharging weigh receptacles under control of the weighing mechanism
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G13/00—Weighing apparatus with automatic feed or discharge for weighing-out batches of material
    • G01G13/24—Weighing mechanism control arrangements for automatic feed or discharge

Definitions

  • This invention relates to a mass flow metering system for measuring the mass flow of fluids and to a method of measuring such the mass flow. Particularly but not exclusively, the invention relates to a system and a method for periodically measuring the mass flow of continuously flowing slurries, such as mineral laden froth.
  • the above difficulty is particularly prevalent in unstable slurries such as froth, where the physical characteristics of the liquid medium are materially influenced by the characteristics of the froth bubbles.
  • volumetric flow of froth such as that produced in a flotation process, can be determined to some degree of accuracy by methods known in the art.
  • volumetric flow often provides inaccurate calculations of the mass ffow of the froth. It also is problematic to sample froth representatively and repetitively, particularly due to the continuously varying density of the froth.
  • EP O 657022 discloses a mass flow meter suitable for measuring the mass flow of milk.
  • An outer conduit which is suspended within a housing by a force transducer system, fn the form of a load cell, is disclosed.
  • the mass of the conduit is continuously recorded and the density of its content is calculated. From the density and volume flow, the mass flow can be calculated.
  • This type of mass flow meter is effective in measuring the mass flow of liquids of varying density such as milk, but does not overcome the difficulties associated with heterogeneous and multi-phase fluids such as slurries, particularly froth.
  • US4726896 discloses a method of measuring the mass flow of a slurry. A micro motion meter is used to measure the flow rate and density. However, this method does not overcome the difficulties associated with bulk froth flow from multiple flotation cells on a commercial scale such as in a large metallurgical operation.
  • an in-line mass flow metering system comprising: a volumetrically metered vessel, configured and dimensioned to receive a metered volume of at least a substantial fraction of a continuous slurry flow; time measuring means for measuring the time for filling the metered volume with slurry; mass measuring means for measuring the mass of the metered volume of slurry in the metered vessel; a discharge valve, to discharge slurry from the metered vessel; and valve control means for controlling the discharge of slurry from the metered vessel.
  • the system may include a metered fluid addition facility to facilitate the dispersion of froth in the metered vessel.
  • the mass flow meter also includes a rinse fluid facility to facilitate the rinsing of the metered vessel after slurry discharge.
  • the metered vessel may be provided with an overflow to facilitate continuous slurry flow in the event of electric or mechanical failure of the valve.
  • the overflow is preferably provided by a second, outer vessel, configured and dimensioned to receive the metered vessel operationally therein.
  • the metered vessel may be suspended on load cells to provide the mass measuring means for measuring the mass of the metered volume of slurry within the metered vessel.
  • the metered vessel may be provided with a level sensor, located at a predetermined level within the metered vessel in accordance with the predetermined metered volume and to ensure a repeatably, volumetrically constant mass measurement,
  • the system may be provided with processing means for calculating the mass flow on a semi-continuous basis to provide real time information on the mass flow of the slurry.
  • the processing means may include a Process Logic Controller (“PLC”) or other dedicated electronic device.
  • PLC Process Logic Controller
  • the fluid may comprise water, and the water may contain a reagent, such as a surfactant, for accelerating the rate at which the bubbles of the froth are dispersed so as to form stable slurry.
  • a reagent such as a surfactant
  • the level sensor may be in communication with the PLC for opening and 105 ⁇ closing the valve.
  • the level sensor may be a vibrating fork-type sensor.
  • the valve control means may be in communication with the valve as well as the load cells and the level sensor.
  • the valve control means may be provided by the PLC.
  • the time measuring means may be in communication with the level sensor and the valve.
  • the load cells preferably are of the bending beam-type load ceils.
  • the valve is preferably a dart or pinch valve.
  • a method of measuring the mass flow of a continuous flowing slurry in-line including the steps of: periodically filling a metered volume with at least a substantial fraction of a continuous slurry flow; measuring the time for filling each metered volume with the slurry; measuring the mass of each metered volume of slurry; and 125 discharging each metered volume of slurry into the slurry flow.
  • the method may include the step of adding a metered volume of fluid to the slurry sample during filling to facilitate the dispersion of froth in the metered vessel. 130 The method further may include the step of adding rinse fluid for rinsing the metered vessel after slurry discharge.
  • a mass flow meter is generally indicated by reference numeral 1.
  • the mass flow metering system 1 comprises a metered vessel 2 for receiving a flow of froth via a conduit 11.
  • the metered vessel 2 is suspended from mass measuring means in the form of load cells 8, 9 and 10 within a second outer vessel 14.
  • the metered vessel 2 has discharge opening 13 for discharging the froth from the vessel, and a discharge control valve 3 associated with the
  • the metered vessel 2 has a level sensor 5, located in the metered vessel at a predetermined level and associated with the valve 3 for opening the valve when the predetermined froth level is reached.
  • the system operates periodically and in cycles, which alternates between a measuring cycle and a cleaning cycle.
  • Pinch valve 3 of container 2 is closed. Froth from a flotation process In a minerals beneficiation operation is delivered through conduit 11 , into container 165 2.
  • Spray water valve 6 is opened and spray water is concurrently sprayed into container 2, through a spray nozzle 4, thereby to reduce the froth to a liquid mixture.
  • a flow meter 12 measures the flow of spray water to container 2.
  • the liquid 170 mixture accumulates within container 2, until the level in the container reaches the level at which a fork type level sensor 5 is located.
  • the level sensor 5 is located at a predetermined level in the container, such that the volume defined up to the sensor is known.
  • Level sensor 5, toad cells 8, 9 and 10 are in communication with PLC 7.
  • the PLC calculates the mass flow of froth by means of a mass balance calculation.
  • pinch valve 3 is open and liquid is dispensed from container 2.
  • Spray water valve 6 is closed and cleaning water valve 15 is 185 open.
  • the mass flow meter is operated on the cleaning cycle for 20 minutes, after which time it is reverted back to the measuring cycle.
  • Opening and closing of the valves is affected by means of solenoid actuators.
  • Spray water nozzle 4 and cleaning water nozzle 9 is in fluid communication 190 with a source of water under 4 Bar pressure.
  • Pinch valve 3 is in fluid communication with a source of air under a pressure of 4 Bar, for pressure closing of the valve.
  • a constant flow of froth is received into container 2, via conduit 11 , both when 195 the mass flow meter is in both the measuring and cleaning cycle. This allows for uninterrupted operation of the floatation process and for continuous measurement of the mass flow of froth.
  • the mass flow meter continuously alternates between the measuring and the cleaning cycle.

Abstract

A mass flow metering system (1) according to the invention comprises a metered vessel (2) for receiving a flow of froth via a conduit (11). The metered vessel (2) is suspended from mass measuring means in the form of load cells (8, 9) and (10) within a second outer vessel (14). The metered vessel (2) has discharge opening (13) for discharging the froth from the vessel, and a discharge control valve (3) associated with the opening for controlling the discharge of froth from the metered vessel. The metered vessel (2) has a level sensor (5), located in the metered vessel at a predetermined level and associated with the valve (3) for opening the valve when the predetermined froth level is reached. In use, the system operates periodically and in cycles, which alternates between a measuring cycle and a cleaning cycle. There is further provided a method of measuring the mass flow of continuous flowing slurry in line.

Description

MASS FLOW METERING SYSTEM
TECHfCAL FIELD
This invention relates to a mass flow metering system for measuring the mass flow of fluids and to a method of measuring such the mass flow. Particularly but not exclusively, the invention relates to a system and a method for periodically measuring the mass flow of continuously flowing slurries, such as mineral laden froth.
BACKGROUND ART
The use of flow meters and samplers in chemical and metallurgical processes is well known, with the difficulty of representative and accurate samples and measurements being exacerbated by heterogeneous, dynamic and non- steady state fiows, such as in slurries.
The above difficulty is particularly prevalent in unstable slurries such as froth, where the physical characteristics of the liquid medium are materially influenced by the characteristics of the froth bubbles.
The volumetric flow of froth, such as that produced in a flotation process, can be determined to some degree of accuracy by methods known in the art. However, as a result of the significant influence of aspects such as the physical characteristics and mineralogy of the solids constituent in the slurry as well as the bubble characteristics of the froth, on the mineral loading of the froth over time, volumetric flow often provides inaccurate calculations of the mass ffow of the froth. It also is problematic to sample froth representatively and repetitively, particularly due to the continuously varying density of the froth. The difficulty with and inaccuracy of sampling and measuring the weight of a froth sample is often inversely proportionate to the size of the sampler used, making the measuring of the mass of bulk froth ove time impractical. An additional difficulty of measuring the mass flow of froth repeatedly is that the solid particles tend to deposit on the walls of the sampler, causing fouling and contamination of the sampler and subsequent samples.
Bulk mass flow meters are known in the art. EP O 657022 discloses a mass flow meter suitable for measuring the mass flow of milk. An outer conduit, which is suspended within a housing by a force transducer system, fn the form of a load cell, is disclosed. The mass of the conduit is continuously recorded and the density of its content is calculated. From the density and volume flow, the mass flow can be calculated. This type of mass flow meter is effective in measuring the mass flow of liquids of varying density such as milk, but does not overcome the difficulties associated with heterogeneous and multi-phase fluids such as slurries, particularly froth.
Methods of measuring bulk mass flows are also known in the art. US4726896 discloses a method of measuring the mass flow of a slurry. A micro motion meter is used to measure the flow rate and density. However, this method does not overcome the difficulties associated with bulk froth flow from multiple flotation cells on a commercial scale such as in a large metallurgical operation.
It is therefore an object of this invention to provide a mass flow metering system, suitable for measuring the mass flow of froth produced in a large- scale metallurgical operation, and to provide a method for measuring the mass flow of froth that will overcome at least some of the above difficulties.
DISCLOSURE OF THE INVENTION
According to a first aspect of the invention there is provided an in-line mass flow metering system comprising: a volumetrically metered vessel, configured and dimensioned to receive a metered volume of at least a substantial fraction of a continuous slurry flow; time measuring means for measuring the time for filling the metered volume with slurry; mass measuring means for measuring the mass of the metered volume of slurry in the metered vessel; a discharge valve, to discharge slurry from the metered vessel; and valve control means for controlling the discharge of slurry from the metered vessel.
The system may include a metered fluid addition facility to facilitate the dispersion of froth in the metered vessel. Preferably, the mass flow meter also includes a rinse fluid facility to facilitate the rinsing of the metered vessel after slurry discharge.
The metered vessel may be provided with an overflow to facilitate continuous slurry flow in the event of electric or mechanical failure of the valve.
The overflow is preferably provided by a second, outer vessel, configured and dimensioned to receive the metered vessel operationally therein.
The metered vessel may be suspended on load cells to provide the mass measuring means for measuring the mass of the metered volume of slurry within the metered vessel.
The metered vessel may be provided with a level sensor, located at a predetermined level within the metered vessel in accordance with the predetermined metered volume and to ensure a repeatably, volumetrically constant mass measurement,
The system may be provided with processing means for calculating the mass flow on a semi-continuous basis to provide real time information on the mass flow of the slurry. The processing means may include a Process Logic Controller ("PLC") or other dedicated electronic device.
100 The fluid may comprise water, and the water may contain a reagent, such as a surfactant, for accelerating the rate at which the bubbles of the froth are dispersed so as to form stable slurry.
The level sensor may be in communication with the PLC for opening and 105 ■ closing the valve. The level sensor may be a vibrating fork-type sensor.
The valve control means may be in communication with the valve as well as the load cells and the level sensor. The valve control means may be provided by the PLC.
110
The time measuring means may be in communication with the level sensor and the valve.
The load cells preferably are of the bending beam-type load ceils.
115
The valve is preferably a dart or pinch valve.
According to a second aspect of the invention there is provided a method of measuring the mass flow of a continuous flowing slurry in-line, the method 120 Including the steps of: periodically filling a metered volume with at least a substantial fraction of a continuous slurry flow; measuring the time for filling each metered volume with the slurry; measuring the mass of each metered volume of slurry; and 125 discharging each metered volume of slurry into the slurry flow.
The method may include the step of adding a metered volume of fluid to the slurry sample during filling to facilitate the dispersion of froth in the metered vessel. 130 The method further may include the step of adding rinse fluid for rinsing the metered vessel after slurry discharge.
BRIEF DESCRIPTION OF THE DRAWING
135
The invention is described below by way of example only and with reference to the accompanying drawing, which shows the mass flow meter.
140 BEST METHOD OF CARRYING OUT THE INVENTION
With reference to Figure 1, a mass flow meter is generally indicated by reference numeral 1.
145 The mass flow metering system 1 comprises a metered vessel 2 for receiving a flow of froth via a conduit 11. The metered vessel 2 is suspended from mass measuring means in the form of load cells 8, 9 and 10 within a second outer vessel 14. The metered vessel 2 has discharge opening 13 for discharging the froth from the vessel, and a discharge control valve 3 associated with the
150 opening for controlling the discharge of froth f om the metered vessel.
The metered vessel 2 has a level sensor 5, located in the metered vessel at a predetermined level and associated with the valve 3 for opening the valve when the predetermined froth level is reached.
155
In use, the system operates periodically and in cycles, which alternates between a measuring cycle and a cleaning cycle.
The cycles are as follows:
160
The Measuring Cycle
Pinch valve 3 of container 2 is closed. Froth from a flotation process In a minerals beneficiation operation is delivered through conduit 11 , into container 165 2. Spray water valve 6 is opened and spray water is concurrently sprayed into container 2, through a spray nozzle 4, thereby to reduce the froth to a liquid mixture.
A flow meter 12 measures the flow of spray water to container 2. The liquid 170 mixture accumulates within container 2, until the level in the container reaches the level at which a fork type level sensor 5 is located. The level sensor 5 is located at a predetermined level in the container, such that the volume defined up to the sensor is known. Level sensor 5, toad cells 8, 9 and 10 are in communication with PLC 7.
175
When the fluid level in container 2 reaches sensor 5, the weight of the liquid in the container, the time consumed to fill container and the volume of spray water added is recorded by the PLC. The PLC now calculates the mass flow of froth by means of a mass balance calculation.
180
The Cleaning Cycle
After recordal of the data, pinch valve 3 is open and liquid is dispensed from container 2. Spray water valve 6 is closed and cleaning water valve 15 is 185 open. The mass flow meter is operated on the cleaning cycle for 20 minutes, after which time it is reverted back to the measuring cycle.
Opening and closing of the valves is affected by means of solenoid actuators. Spray water nozzle 4 and cleaning water nozzle 9 is in fluid communication 190 with a source of water under 4 Bar pressure. Pinch valve 3 is in fluid communication with a source of air under a pressure of 4 Bar, for pressure closing of the valve.
A constant flow of froth is received into container 2, via conduit 11 , both when 195 the mass flow meter is in both the measuring and cleaning cycle. This allows for uninterrupted operation of the floatation process and for continuous measurement of the mass flow of froth. The mass flow meter continuously alternates between the measuring and the cleaning cycle. It will be appreciated that many variations in detail are possible without departing from the scope and/or spirit of the inventions as defined in the consistory clauses herein before.

Claims

CLAIMS!
205 1. An in-line mass flow metering system comprising a volumetrically metered vessel, configured and dimensioned to receive a metered volume of at least a substantial fraction of a continuous slurry flow; time measuring means for measuring the time for filling the metered 210 volume with slurry; mass measuring means for measuring the mass of the metered volume of slurry in the metered vessel; a discharge valve, to discharge slurry from the metered vessel; and valve control means for controlling the discharge of slurry from the 215 metered vessel.
2. A mass flow metering system according to claim 1 including a metered fluid addition facility to facilitate the dispersion of fluid in the metered vessel.
220
3. A mass flow metering system according to claim 2, wherein the fluid dispersed is froth.
4. A mass flow metering system according to claim 1 , 2 or 3, wherein the 225 mass flow meter also includes a rinse fluid facility to facilitate the rinsing of the metered vessel after slurry discharge.
5. A mass flow metering system according to any of claims 1 to 4, wherein the metered vessel is provided with an overflow to facilitate
230 continuous slurry flow in the event of electric or mechanical failure of the valve.
6. A mass flow metering system according to any of claims 1 to 5, wherein the overflow is preferably provided by a second outer vessel,
235 configured and dimensioned to receive the metered vessel operationally therein.
7. A mass flow metering system according to any of claims 1 to 6, wherein the metered vessel is suspended on load cells to provide the
240 mass measuring means for measuring the mass of the metered volume of slurry within the metered vessel,
8. A mass flow metering system according to any of claims 1 to 7, wherein the metered vessel is provided with a level sensor.
245
9. A mass flow metering system according to claim 8, wherein the level sensor is located at a pre-determined level within the metered vessel in accordance with the pre-determined metered volume to ensure a repeatably, volumetrically constant mass measurement.
250
10.A mass flow metering system according to any of claims 1 to 9, wherein the system is provided with processing means for calculating the mass flow.
255 11. A mass flow metering system according to claim 10, wherein the processing means calculates the mass flow on a semi-continuous basis to provide real time information on the mass flow of the slurry.
1 . A mass flow metering system according to claim 10 or 11, wherein the 260 processing means includes a Process Logic Controller.
13. A mass flow metering system according to claim 2, wherein the fluid comprises water.
265 14. A mass flow metering system according to claim 13, wherein the water contains a reagent.
15. A mass flow metering system according to claim 14, wherein the reagent is a surfactant, for accelerating the rate at which the bubbles of 270 the froth are dispersed so as to form stable slurry.
16. A mass flow metering system according to claim 12, wherein the level sensor is in communication with the PLC for opening and closing the valve,
275
17. A mass flow metering system according to any of claims 8 to 16, wherein the level sensor is a vibrating fork-type sensor.
18. A mass flow metering system according to any of claims 8 to 17, 280 wherein the valve control means is in communication with the valve, the load cells and the level sensor.
9. A mass flow metering system according to any of claims 12 to 18, wherein the valve control means is provided by the PLC.
285
20. A mass flow metering system according to any of claims 8 to 19, wherein the time measuring means may be in communication with the level sensor and the valve.
290 21. A mass flow metering system according to any of claims 7 to 20, wherein the load cells are of the bending beam-type load cells.
22. A mass flow metering system according to any of claims 1 to 21, wherein the valve is a pinch valve.
295
23. A mass flow metering system according to any of claims 1 to 21, wherein the valve is a dart valve.
24. A method of measuring the mass flow of continuous flowing slurry in- 300 line, the method including the steps of periodically filling a metered volume with at least a substantial fraction of a continuous slurry flow; measuring the time for filling each metered volume with the slurry; 305 measuring the mass of each metered volume of slurry; and discharging each metered volume of slurry into the slurry flow.
25. A method of measuring the mass flow of continuous flowing slurry inline according to claim 23, further including the step of adding a
310 metered volume of fluid to the slurry sample during filling to facilitate the dispersion of froth in the metered vessel.
26. A method of measuring the mass flow of continuous flowing slurry inline according to claim 23 or 24, further including the step of adding
315 rinse fluid for rinsing the metered vessel after slurry discharge.
320
PCT/IB2004/050847 2003-06-06 2004-06-07 Mass flow metering systems WO2004109240A2 (en)

Applications Claiming Priority (2)

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ZA2003/3444 2003-06-06
ZA200303444 2003-06-06

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WO2004109240A3 WO2004109240A3 (en) 2005-05-12

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ES2304885A1 (en) * 2007-04-12 2008-10-16 Payper, S.A. Weighing machine (Machine-translation by Google Translate, not legally binding)
CN102445244A (en) * 2011-10-18 2012-05-09 昆明有色冶金设计研究院股份公司 Ore slurry online detection device and multi-parameter detection method
CN103234609A (en) * 2013-04-25 2013-08-07 山东建设机械股份有限公司 Small-dose liquid volume metering balance
CN103557885A (en) * 2013-10-28 2014-02-05 长沙有色冶金设计研究院有限公司 Integrated trough type ore pulp concentration flow meter
CN103630220A (en) * 2013-11-10 2014-03-12 西安航天化学动力厂 Device for weighing liquid with viscosity being 4mPa.S
CN105966941A (en) * 2016-06-24 2016-09-28 上海海融食品科技股份有限公司 Charging and weighing system and charging and weighing method for cream production line
WO2017084035A1 (en) * 2015-11-18 2017-05-26 赵正峰 Amount-controllable material-feeding device
CN109944714A (en) * 2018-12-10 2019-06-28 西安航天化学动力有限公司 The on-line measuring device of hopper blanking velocity
CN110095163A (en) * 2019-06-20 2019-08-06 西安新汇泽测控技术有限公司 Full runoff and sediment automonitor
CN113758549A (en) * 2021-09-01 2021-12-07 辽宁科技大学 Method for rapidly measuring weight of flotation foam product
CN114364441A (en) * 2019-09-10 2022-04-15 朗姆研究公司 In situ sensor fusion with artificial intelligence

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US4823592A (en) * 1988-02-05 1989-04-25 Micro Motion, Inc. Test apparatus for proving the performance of mass flow meters
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US3125881A (en) * 1964-03-24 Rate of flow meter
US4836017A (en) * 1987-06-08 1989-06-06 Universal Industries Ltd. Method and apparatus for determining oil content of oil well production
US4823592A (en) * 1988-02-05 1989-04-25 Micro Motion, Inc. Test apparatus for proving the performance of mass flow meters

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2304885A1 (en) * 2007-04-12 2008-10-16 Payper, S.A. Weighing machine (Machine-translation by Google Translate, not legally binding)
CN102445244A (en) * 2011-10-18 2012-05-09 昆明有色冶金设计研究院股份公司 Ore slurry online detection device and multi-parameter detection method
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CN103630220A (en) * 2013-11-10 2014-03-12 西安航天化学动力厂 Device for weighing liquid with viscosity being 4mPa.S
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CN109944714A (en) * 2018-12-10 2019-06-28 西安航天化学动力有限公司 The on-line measuring device of hopper blanking velocity
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