CN114594027A - Device and method for measuring dynamic settling velocity of high-concentration slurry particles - Google Patents
Device and method for measuring dynamic settling velocity of high-concentration slurry particles Download PDFInfo
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- 239000002245 particle Substances 0.000 title claims abstract description 48
- 239000002002 slurry Substances 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000001514 detection method Methods 0.000 claims abstract description 61
- 230000007246 mechanism Effects 0.000 claims abstract description 42
- 238000012360 testing method Methods 0.000 claims abstract description 12
- 238000004891 communication Methods 0.000 claims abstract description 7
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 19
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 19
- 241001330002 Bambuseae Species 0.000 claims description 19
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 19
- 239000011425 bamboo Substances 0.000 claims description 19
- 239000000523 sample Substances 0.000 claims description 17
- 238000004062 sedimentation Methods 0.000 claims description 15
- 238000010008 shearing Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 5
- 238000013480 data collection Methods 0.000 claims description 4
- 239000011521 glass Substances 0.000 claims description 3
- 239000008187 granular material Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000013401 experimental design Methods 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 8
- 238000011160 research Methods 0.000 abstract description 4
- 238000009825 accumulation Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/04—Investigating sedimentation of particle suspensions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
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Abstract
The invention discloses a device and a method for measuring the dynamic settling velocity of high-concentration slurry particles, wherein the device comprises a rotating mechanism, an inner cylinder, an outer cylinder, a conductivity detection mechanism and a data collector, the inner cylinder is sleeved in the outer cylinder, two ends of the inner cylinder are rotatably arranged on the end surface of the outer cylinder, the inner cylinder is connected with the rotating mechanism, the rotating mechanism is arranged on the outer cylinder, the outer cylinder is at least provided with two conductivity detection mechanisms in the vertical direction, and the conductivity detection mechanisms are in communication connection with the data collector. The invention designs a shear settlement test device based on the principle that the slurry concentration is related to the conductivity characteristic thereof, realizes the research on the dynamic settlement characteristic of non-Newtonian slurry particles, further realizes the determination of parameters such as critical flow velocity, accumulation gradient and the like, and provides a reference basis for the design of a tailing high-concentration discharge project.
Description
Technical Field
The invention relates to the technical field of sedimentation velocity determination, in particular to a device and a method for determining the dynamic sedimentation velocity of high-concentration slurry particles.
Background
The settling velocity of the particles is an important content for slurry flow property research, and has very important significance for determining engineering design parameters such as critical flow velocity, deposition rule and the like. For low-concentration slurry, a measuring cylinder test is generally carried out to measure the settling velocity of the particle group, and the settling velocity of the particle group is determined by observing the descending velocity of the interface of the supernatant and the mud layer in unit time. However, for high-concentration slurry, the mud layer interface is not obvious, the sedimentation rule of the particle group is difficult to observe through a simple graduated cylinder test, and the particle group is required to be indirectly acquired through some nondestructive detection methods. On the other hand, studies have shown that: in a static state, the sedimentation velocity of particles in the high-concentration slurry is very small, even the particles can keep suspension for a long time, but once the particles are subjected to dynamic shearing action, the sedimentation velocity is increased, namely the particles have a shearing sedimentation effect.
A large amount of tailings are generated in the development and utilization process of metal mineral resources, and the method is a key problem to be solved for the sustainable development of the mining industry. The principle of the novel tailings disposal process is to deeply concentrate low-concentration tailing slurry in a dressing plant to form high-concentration tailing slurry, and then the high-concentration tailing slurry is pumped to the ground surface through a pipeline to be stacked or a goaf is backfilled. Because the high concentration processing technology of tailings can effectively reduce the risk of dam break, improve the utilization rate of backwater, and reduce the influence on the surrounding ecological environment, the high concentration discharge engineering design of tailings is slow, and a device for measuring the dynamic sedimentation velocity of high concentration slurry particles is urgently needed to provide a design reference basis.
Disclosure of Invention
The invention aims to provide a device and a method for measuring the dynamic settling velocity of high-concentration slurry particles, which are used for solving the problems in the prior art and enabling the settling velocity and the settling rule of particle groups to be researched more conveniently and quickly.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a device for measuring the dynamic settling velocity of high-concentration slurry particles, which comprises a rotating mechanism, an inner cylinder, an outer cylinder, a conductivity detection mechanism and a data collector, wherein the inner cylinder is sleeved in the outer cylinder, two ends of the inner cylinder are rotatably arranged on the end surface of the outer cylinder, the inner cylinder is connected with the rotating mechanism, the rotating mechanism is arranged on the outer cylinder, the outer cylinder is at least provided with two conductivity detection mechanisms in the vertical direction, and the conductivity detection mechanisms are in communication connection with the data collector.
Preferably, the urceolus includes a sealing connection's last section of thick bamboo and a lower section of thick bamboo, the material of going up a section of thick bamboo is transparent organic glass, the material of a lower section of thick bamboo is PVC, go up and have the top cap through bolted connection on the section of thick bamboo, there is the base bottom of a lower section of thick bamboo through bolted connection.
Preferably, two upper and lower detection faces are arranged on the lower barrel, and each detection face comprises a plurality of conductivity detection mechanisms uniformly distributed along the circumferential direction of the lower barrel.
Preferably, the distance between the two detection surfaces is 50mm, and the conductivity detection mechanism is a conductivity detection probe.
Preferably, six conductivity detection mechanisms are arranged on each detection surface, each data acquisition unit is a multi-channel data acquisition unit, and each conductivity detection mechanism is in communication connection with the data acquisition unit.
Preferably, two ends of the inner cylinder are provided with convex cone buckets, the cone buckets are connected with a rotating shaft of the rotating mechanism, and the inner cylinder and the outer cylinder are coaxially sleeved.
Preferably, the clearance between the inner cylinder and the outer cylinder is 8mm-12 mm.
Preferably, the rotating mechanism comprises a speed reducing motor and a rotating shaft, the speed reducing motor is fixed on the outer cylinder, and the rotating shaft is arranged at two ends of the inner cylinder.
The invention relates to a method for measuring the dynamic settling velocity of high-concentration slurry particles, which is based on the device for measuring the dynamic settling velocity of the high-concentration slurry particles and comprises the following steps:
the method comprises the following steps that firstly, after a sample of high-concentration slurry prepared according to the designed mass fraction is fully stirred, a top cover of an outer cylinder is opened, the sample is slowly poured into the outer cylinder, an inner cylinder is installed in the outer cylinder, and an annular gap between the inner cylinder and the outer cylinder is filled with the sample;
secondly, starting a motor and obtaining the rotating speed n of the motor, so that the rotating linear speed of the sample in the annular gap is 2 pi nr, the shearing rate in a flow field is gamma-delta U/. DELTA.L, the inner cylinder rotates under the driving of the motor, and a data acquisition unit starts data acquisition;
and thirdly, observing the change conditions of the electric conductivity on the two detection surfaces, recording the interval time delta t of the electric conductivity peaks of the two detection surfaces, namely the sedimentation time of the particle group, and calculating the average sedimentation speed omega of the particle group as delta H/delta t if the distance between the two detection surfaces is delta H.
Preferably, in the second step, the rotating speed of the motor can be adjusted according to a test design rotating speed n; and after the test in the third step is finished, opening the top cover of the outer cylinder, pouring out all the samples, and washing the outer cylinder and the inner cylinder completely with water.
Compared with the prior art, the invention has the following technical effects:
the invention designs a shearing sedimentation test device based on the principle that the slurry concentration is related to the conductivity characteristic of the slurry, realizes the research on the dynamic sedimentation characteristic of non-Newtonian slurry particles, further realizes the determination of parameters such as critical flow rate, accumulation gradient and the like, and provides a reference basis for the design of a tailing high-concentration discharge project.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an apparatus for determining the dynamic settling velocity of high-concentration slurry particles according to the present invention;
FIG. 2 is a schematic view of the structure A-A (detection plane) of FIG. 1 according to the present invention;
FIG. 3 is a graph showing the change of conductivity with time of detection in the present invention;
wherein: 1-a speed reduction motor, 2-a rotating shaft, 3-a base, 4-a top cover, 5-an upper cylinder, 6-a lower cylinder, 7-a detection surface, 8-an inner cylinder, 9-a data acquisition unit and 10-a conductivity detection probe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
The invention aims to provide a device and a method for measuring the dynamic settling velocity of high-concentration slurry particles, which are used for solving the problems in the prior art and ensuring that the settling velocity and the settling rule of particle groups are researched more conveniently and quickly.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1 to 3: the embodiment provides a high concentration slurry particle dynamic settling velocity's survey device, including slewing mechanism, inner tube 8, urceolus, conductivity detection mechanism and data collection station 9, in the urceolus was located to the inner tube 8 cover, the both ends of inner tube 8 were rotated and are set up on the terminal surface of urceolus, and slewing mechanism is connected to inner tube 8, and slewing mechanism sets up on the urceolus, and the urceolus is provided with two conductivity detection mechanisms on along vertical direction at least, conductivity detection mechanism and data collection station 9 communication connection.
The urceolus includes a sealing connection's last section of thick bamboo 5 and a lower section of thick bamboo 6, and the material of going up a section of thick bamboo 5 is transparent organic glass, can observe the state in the test process, and the material of a lower section of thick bamboo 6 is PVC, has top cap 4 through bolted connection on the last section of thick bamboo 5, and there is base 3, the dismouting of being convenient for bottom through bolted connection of a lower section of thick bamboo 6.
Two upper and lower detection faces 7 are arranged on the lower barrel 6, and each detection face 7 comprises a plurality of conductivity detection mechanisms uniformly distributed along the circumferential direction of the lower barrel 6. The distance between the two detection surfaces 7 is 50mm, and the conductivity detection mechanism is a conductivity detection probe 10. Six conductivity detection mechanisms are arranged on each detection surface 7, each conductivity detection mechanism is in communication connection with the data acquisition unit 9, the data acquisition unit 9 is a multi-channel data acquisition unit and is provided with a plurality of data interfaces, and detection data of all conductivity detection probes 10 can be acquired and recorded in real time.
The both ends of inner tube 8 all are provided with convex awl fill, are connected with slewing mechanism's pivot 2 on the awl is fought, and inner tube 8 and urceolus coaxial line cover are established, prevent that inner tube 8 rotatory in-process from producing relative motion. The clearance between the inner cylinder 8 and the outer cylinder is 8mm-12mm to ensure the free flow of the test slurry in the annular gap. Wherein, slewing mechanism includes gear motor 1 and pivot 2, and gear motor 1 is fixed in on the urceolus, and pivot 2 sets up on the both ends of inner tube 8.
The invention relates to a method for measuring the dynamic settling velocity of high-concentration slurry particles, which is based on the device for measuring the dynamic settling velocity of the high-concentration slurry particles and comprises the following steps:
the first step, after fully stirring a sample of high-concentration slurry prepared according to the designed mass fraction, opening a top cover 4 of an outer cylinder, slowly pouring the sample into the outer cylinder, and installing an inner cylinder 8 into the outer cylinder to fill the annular gap between the inner cylinder 8 and the outer cylinder with the sample.
And secondly, starting the motor and obtaining the rotating speed n of the motor, so that the rotating linear speed of the sample in the annular gap is 2 pi nr (r is the rotating radius and is the average value of the radii of the inner cylinder and the outer cylinder), the shearing rate in the flow field is gamma delta U/delta L, the inner cylinder 8 rotates under the driving of the motor, and the data acquisition unit 9 starts data acquisition. Under the different shear rate in the calculation of shear rate, the settling velocity of slurry granule is different, through adjusting motor speed n, can pass through this testing arrangement, under a certain shear rate of survey, the settling velocity of granule in the test slurry, the settling velocity is dynamic. When the inner cylinder 8 rotates, data acquisition is started, and data changes of the two detection sections are observed. When the particles are settled and pass through the upper detection section, the mass fraction of the area is increased, the conductivity is increased, the particles continue to settle, and the conductivity is reduced; the tendency of the particles to increase and decrease in conductivity also occurs as they pass through the lower inspection cross-section. Wherein, the rotational speed of motor can adjust according to experimental design rotational speed n.
And thirdly, observing the change situation of the electric conductivity on the two detection surfaces 7, recording the interval time delta t of the electric conductivity peak values of the two detection surfaces 7, namely the sedimentation time of the particle group, and calculating the average sedimentation speed omega of the particle group as delta H/delta t if the distance between the two detection surfaces 7 is delta H. After the test is finished, the top cover 4 of the outer cylinder is opened, all samples are poured out, and the outer cylinder and the inner cylinder 8 are washed clean by water.
In the embodiment, based on the principle of the correlation between the mass fraction of the slurry and the electrical conductivity thereof, the settling time of the particle group on the interval between the upper detection surface 7 and the lower detection surface 7 is obtained by observing the change condition of the electrical conductivity of the upper detection surface and the lower detection surface, and the settling velocity rule of the particle group is finally obtained; meanwhile, a shearing flow field is formed in the annular gap through the arrangement of the inner cylinder and the outer cylinder, so that the research on the dynamic settlement rule is realized.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above description of the embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. The utility model provides a survey device of high concentration slurry granule dynamic settlement speed which characterized in that: including slewing mechanism, inner tube, urceolus, conductivity detection mechanism and data collection station, the inner tube cover is located in the urceolus, the both ends of inner tube rotate set up in on the terminal surface of urceolus, the inner tube is connected slewing mechanism, slewing mechanism set up in on the urceolus, the urceolus is provided with two at least along vertical direction conductivity detection mechanism, conductivity detection mechanism with data collection station communication connection.
2. The apparatus for determining the dynamic settling velocity of high consistency slurry particles as defined in claim 1, wherein: the urceolus includes a sealing connection's last section of thick bamboo and a lower section of thick bamboo, the material of going up a section of thick bamboo is transparent organic glass, the material of a lower section of thick bamboo is PVC, go up and have the top cap through bolted connection on the section of thick bamboo, there is the base bottom of a lower section of thick bamboo through bolted connection.
3. The apparatus for determining the dynamic settling velocity of high consistency slurry particles as defined in claim 2, wherein: two detection faces about being provided with on the lower section of thick bamboo, every the detection face all includes that a plurality of is followed a circumferencial direction equipartition is down the conductivity detection mechanism.
4. The apparatus for determining the dynamic settling velocity of high consistency slurry particles as defined in claim 3, wherein: the distance between the two detection surfaces is 50mm, and the conductivity detection mechanism is a conductivity detection probe.
5. The apparatus for determining the dynamic settling velocity of high consistency slurry particles as defined in claim 3, wherein: six conductivity detection mechanisms are arranged on each detection surface, the data collector is a multi-channel data collector, and each conductivity detection mechanism is in communication connection with the data collector.
6. The apparatus for determining the dynamic settling velocity of high consistency slurry particles as defined in claim 5, wherein: the two ends of the inner cylinder are provided with convex conical buckets, the conical buckets are connected with a rotating shaft of the rotating mechanism, and the inner cylinder and the outer cylinder are coaxially sleeved.
7. The apparatus for determining the dynamic settling velocity of high consistency slurry particles as defined in claim 1, wherein: the clearance between the inner cylinder and the outer cylinder is 8mm-12 mm.
8. The apparatus for determining the dynamic settling velocity of high consistency slurry particles as defined in claim 1, wherein: the rotating mechanism comprises a speed reducing motor and a rotating shaft, the speed reducing motor is fixed on the outer barrel, and the rotating shaft is arranged at two ends of the inner barrel.
9. A method for measuring a dynamic settling velocity of high-concentration slurry particles, which is based on the apparatus for measuring a dynamic settling velocity of high-concentration slurry particles according to any one of claims 1 to 8, and which comprises: the method comprises the following steps:
the method comprises the following steps that firstly, after a sample of high-concentration slurry prepared according to the designed mass fraction is fully stirred, a top cover of an outer cylinder is opened, the sample is slowly poured into the outer cylinder, an inner cylinder is installed in the outer cylinder, and an annular gap between the inner cylinder and the outer cylinder is filled with the sample;
secondly, starting a motor and obtaining the rotating speed n of the motor, so that the rotating linear speed of the sample in the annular gap is 2 pi nr, the shearing rate in a flow field is gamma-delta U/. DELTA.L, the inner cylinder rotates under the driving of the motor, and a data acquisition unit starts data acquisition;
and thirdly, observing the change conditions of the electric conductivity on the two detection surfaces, recording the interval time delta t of the electric conductivity peaks of the two detection surfaces, namely the sedimentation time of the particle group, and calculating the average sedimentation speed omega of the particle group as delta H/delta t if the distance between the two detection surfaces is delta H.
10. The method for determining a dynamic settling velocity of high-consistency slurry particles as claimed in claim 9, wherein: in the second step, the rotating speed of the motor can be adjusted according to the experimental design rotating speed n; and after the test in the third step is finished, opening the top cover of the outer cylinder, pouring out all the samples, and washing the outer cylinder and the inner cylinder completely with water.
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| CN202210201234.7A CN114594027A (en) | 2022-03-03 | 2022-03-03 | Device and method for measuring dynamic settling velocity of high-concentration slurry particles |
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|---|---|---|---|---|
| ATA128688A (en) * | 1988-05-17 | 1990-09-15 | Justin Reinhardt Dr | DEVICE FOR DETERMINING THE SEPARATION SPEED OF SUSPENDED, FLOCKED, DISPERSED OR COLLOIDAL IN A LIQUID, IN PARTICULAR WATER-SOLVED SUBSTANCES |
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2022
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