CN115235890B - Experimental research device for dual rheological characteristics of high-concentration tailing slurry and application method - Google Patents
Experimental research device for dual rheological characteristics of high-concentration tailing slurry and application method Download PDFInfo
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N11/10—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material
- G01N11/14—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material by using rotary bodies, e.g. vane
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N2011/0026—Investigating specific flow properties of non-Newtonian fluids
- G01N2011/0033—Yield stress; Residual stress at zero shear rate
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Abstract
The invention provides a device for experimental study on dual rheological properties of high-concentration tailing slurry and a using method thereof, and belongs to the technical field of full tailing filling and thickening. The device comprises a compression yield stress testing module, a shear yield stress testing module, a data acquisition module, a bracket, a material containing cylinder and a scale, wherein the compression yield stress testing module comprises a compression piston, a pressure sensor, filter paper, a pressing device and a pressure transmitter; the shear yield stress testing module comprises a slurry rotor, a sealing cover, a water blocking plug, a torque sensor and a driving motor; the data acquisition module mainly comprises a computer and a data acquisition device. The device can simulate the evolution rule of rheological property under the pressure-shear coupling action in the full pressure range of the real thickener, can simultaneously obtain the compressive yield stress and the shear yield stress dual rheological property under the in-situ condition, can finally obtain the corresponding slurry concentration, and can obtain a plurality of groups of dual rheological properties by only carrying out one experiment.
Description
Technical Field
The invention relates to the technical field of full tailing filling and thickening, in particular to a device for experimental research on dual rheological properties of high-concentration tailing slurry and a use method thereof.
Background
Tailing ponds and goaf are two important dangerous sources of mines, and paste filling technology is being adopted by more and more mines as a safe, environment-friendly, economical and efficient green mining technology, and is also an important means for realizing 'one-waste-to-two-hazard'. The concentration of the tailings is used as a primary link in the paste filling, and is related to the smooth operation of the whole paste filling system, wherein the underflow concentration of the tailings slurry in a compacting zone in a thickener is very important for the filling efficiency of the filling system. The compression yield stress and the shear yield stress are key performance indexes affecting the concentration of the underflow, but the current means for improving the concentration of the underflow is also concentrated on the application of single external force, namely, the influence of the pressure and the shear force on the concentration of the underflow and the rheological property of the slurry cannot be comprehensively researched by improving the height of a mud layer or introducing the shearing action of a harrow frame, and the corresponding rheological measurement has limitations, so that the rheological property of the underflow in a full pressure range, especially in a high pressure area, cannot be obtained, and the traditional measurement means have larger disturbance on the tailing slurry and larger error. Therefore, it is needed to develop an experimental research device for testing dual rheological properties of tailings slurry in situ, so as to obtain compressive yield stress and shear yield stress under the coupling action of "pressure and shear" within the full pressure range, so as to promote comprehensive understanding of the thickening performance and thickening effect, and promote development of paste filling technology.
Disclosure of Invention
The invention aims to solve the technical problem of providing a device for experimental study on dual rheological characteristics of high-concentration tailing slurry and a using method thereof
The device comprises a compression yield stress testing module, a shear yield stress testing module, a data acquisition module, a bracket, a scale and a material containing cylinder,
the compression yield stress testing module comprises a compression piston, a pressure sensor, filter paper, a pressing device and a pressure transmitter, wherein the pressure sensor is arranged in the compression piston, the filter paper is positioned at the bottom of the compression piston, the compression piston is connected with the pressing device, the pressing device is controlled by the pressure transmitter, and the pressure transmitter is connected with a computer;
the shear yield stress testing module comprises a slurry rotor, a sealing cover, a water blocking plug, a torque sensor and a driving motor, wherein the slurry rotor is positioned in the material containing cylinder, the lower end of the slurry rotor penetrates through the sealing cover at the bottom of the material containing cylinder to be connected with the torque sensor and the driving motor, the slurry rotor and the sealing cover are sealed through the water blocking plug, and the torque sensor is connected with the data acquisition device;
the data acquisition module comprises a data acquisition device and a computer, and the data acquisition device is connected with the computer;
the scaleplate is positioned at one side of the material containing cylinder and is fixed on the bracket;
the material containing cylinder is fixed on the bracket.
The compression yield stress testing module, the shear yield stress testing module and the material containing cylinder are arranged on the same central axis, and in the compression process, the pressing device is required to be positioned on the central position of the compression piston, the pressure sensor is positioned on the central position of the compression piston, and the zero scale mark of the scale and the sealing cover at the bottom of the material containing cylinder are arranged on the same horizontal line.
The filter paper is positioned at the bottom of the compression piston and above the tailing slurry, and is tightly contacted with the inner wall of the material containing cylinder to prevent the tailing slurry from leaking outwards;
the compression piston is made of stainless steel materials, the height of the compression piston is 2cm, the material containing cylinder is made of acrylic materials, friction resistance between the compression piston and the inner wall of the material containing cylinder is eliminated, and the gap between the compression piston and the material containing cylinder is smaller than 0.5mm.
The shear yield stress testing module is positioned at the bottom of the material containing cylinder, the driving motor drives the slurry type rotor to rotate, the rotating speed is controlled to be 0.5-10rpm, the bottom sealing cover is detachable and is tightly matched with the material containing cylinder, the water blocking plug is tightly matched with the slurry type rotor, and water seepage at the bottom is prevented.
The diameter of the material containing cylinder is 6-8cm, the height of the material containing cylinder is 12-16cm, the slurry rotor is provided with four blades which are arranged at an included angle of 90 degrees, each blade is 1.5cm wide and 4cm high, and the distance between the bottom of each blade of the slurry rotor and the sealing cover is 0.5-1.0cm.
The pressure applying device is controlled by the pressure transmitter, the pressure range of 5-10000pa can be tested, the torque sensor and the pressure sensor are connected with the data acquisition device for data acquisition, and the data acquisition device transmits acquired data to the computer.
The application method of the device comprises the following steps:
s1: assembling an experimental device, installing a sealing cover, completing corresponding line connection, injecting high-concentration slurry (the general concentration is more than or equal to 50%) with known concentration and mass into a material containing cylinder, wherein the injection height is 2cm away from an opening at the upper end of the material containing cylinder, and recording the initial liquid level height through a scale;
s2: after the slurry is stable, placing filter paper on the top of the slurry, placing a compression piston on the filter paper, controlling a pressure transmitter through a computer to enable a pressing device to output constant pressure, simultaneously opening a driving motor to drive a slurry type rotor to rotate at constant rotating speed, and enabling the pressing device and the slurry type rotor to simultaneously operate to compress and shear the tailing slurry;
s3: in the running process, part of flocculating water seeps out through the filter paper, and the seeping water is sucked out by using the injector in time;
s4: when the compression piston is observed to be stable and not to descend, recording the end liquid level according to the reading of the scale, and recording the pressure value and the torque value of the pressure sensor and the torque sensor after being acquired and processed by the data acquisition device, wherein the pressure value is the compression yield stress, the torque value is converted into the shear yield stress through a formula, and the concentration of the tailing slurry is obtained through calculation of the initial value and the end value of the scale;
s5: continuously increasing the applied pressure to compress, keeping the slurry rotor to continuously rotate, repeating the operation in S4 when the compression piston stops compressing, continuously increasing the pressure to obtain a plurality of groups of pressure values and torque values, and finally obtaining the double rheological properties of compression yield stress and shear yield stress corresponding to different slurry concentrations through conversion;
s6: after the experiment is finished, the experimental device is disassembled and cleaned.
The technical scheme of the invention has the following beneficial effects:
in the scheme, the experimental research device can simulate the evolution rule of the rheological property under the pressure-shear coupling effect in the full pressure range of the real thickener, can simultaneously obtain the compressive yield stress and the shear yield stress dual rheological property under the in-situ condition, and finally can obtain the corresponding slurry concentration, and a plurality of groups of dual rheological properties can be obtained by only carrying out one experiment. The experimental device is more in line with the compression state of the slurry in the compaction region of the real thickener, and is an important means for researching the rheological property evolution rule of the high-concentration tailing slurry of the thickener. Has important significance for improving the thickening performance and the filling efficiency.
Drawings
FIG. 1 is a schematic diagram of a device for experimental study of dual rheological properties of high-concentration tailings slurry.
Wherein: 1-a bracket; 2-scale; 3-a material containing cylinder; 4-compressing the piston; 5-a pressure sensor; 6-filter paper; 7-a pressing device; 8-a pressure transmitter; 9-paddle rotor; 10-sealing cover; 11-water blocking; 12-a torque sensor; 13-a drive motor; 14-a data collector; 15-computer.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
The invention provides a device for experimental study on dual rheological characteristics of high-concentration tailing slurry and a use method thereof.
As shown in fig. 1, the device comprises a compression yield stress testing module, a shear yield stress testing module, a data acquisition module, a bracket 1, a scale 2 and a material containing cylinder 3,
the compression yield stress testing module comprises a compression piston 4, a pressure sensor 5, filter paper 6, a pressing device 7 and a pressure transmitter 8, wherein the pressure sensor 5 is arranged in the compression piston 4, the filter paper 6 is positioned at the bottom of the compression piston 4, the compression piston 4 is connected with the pressing device 7, the pressing device 7 is controlled by the pressure transmitter 8, and the pressure transmitter 8 is connected with a computer 15;
the shear yield stress testing module comprises a slurry rotor 9, a sealing cover 10, a water blocking plug 11, a torque sensor 12 and a driving motor 13, wherein the slurry rotor 9 is positioned in a Cheng Liao cylinder 3, the lower end of the slurry rotor 9 penetrates through the sealing cover 10 at the bottom of the material containing cylinder 3 to be connected with the torque sensor 12 and the driving motor 13, the slurry rotor 9 and the sealing cover 10 are sealed through the water blocking plug 11, and the torque sensor 12 is connected with a data collector 14;
the data acquisition module comprises a data acquisition device 14 and a computer 15, and the data acquisition device 14 is connected with the computer 15;
the scale 2 is positioned on one side of the material containing cylinder 3 and is fixed on the bracket 1;
the material containing cylinder 3 is fixed on the bracket 1.
The compression yield stress testing module, the shear yield stress testing module and the material containing cylinder 3 are arranged on the same central axis, and in the compression process, the pressing device 7 is positioned on the central position of the compression piston 4, the pressure sensor 5 is positioned on the central position of the compression piston 4, and the zero scale line of the scale 2 and the sealing cover 10 at the bottom of the material containing cylinder 3 are arranged on the same horizontal line.
The filter paper 6 is positioned at the bottom of the compression piston 4 and above the tailing slurry, and the filter paper 6 is tightly contacted with the inner wall of the material containing cylinder 3 to prevent the tailing slurry from leaking outwards;
the compression piston 4 is made of stainless steel, the height is 2cm, the material containing cylinder 3 is made of acrylic material, friction resistance between the compression piston 4 and the inner wall of the material containing cylinder 3 is eliminated, and a gap between the compression piston 4 and the material containing cylinder 3 is smaller than 0.5mm.
The shear yield stress testing module is positioned at the bottom of the material containing cylinder 3, the driving motor 13 drives the slurry rotor 9 to rotate, the rotating speed is controlled at 0.5-10rpm, the bottom sealing cover 10 is detachable and is tightly matched with the material containing cylinder 3, the water blocking plug 11 is tightly matched with the slurry rotor 9, and water seepage at the bottom is prevented.
The diameter of the material containing cylinder 3 is 6-8cm, the height is 12-16cm, the slurry rotor 9 is provided with four blades which are arranged at an included angle of 90 degrees, each blade is 1.5cm wide and 4cm high, and the distance between the bottom of each blade of the slurry rotor 9 and the sealing cover is 0.5-1.0cm.
The pressure applying device 7 is controlled by the pressure transmitter 8, so that the pressure range test of 5-10000pa can be realized, the torque sensor 12 and the pressure sensor 5 are connected with the data acquisition device 14 for data acquisition, and the data acquisition device 14 transmits acquired data to the computer 15.
The application method of the device is characterized by comprising the following steps:
s1: assembling an experimental device, installing a sealing cover 10, completing corresponding line connection, injecting high-concentration slurry with known concentration and mass into a material containing cylinder 3, wherein the injection height is 2cm away from an opening at the upper end of the material containing cylinder 3, and recording the initial liquid level height through a scale 2;
s2: after the slurry is stable, placing filter paper 6 on the top of the slurry, placing a compression piston 4 on the filter paper 6, controlling a pressure transmitter 8 through a computer 15 to enable a pressing device 7 to output constant pressure, simultaneously opening a driving motor 13 to drive a slurry rotor 9 to rotate at constant rotation speed, and enabling the pressing device 7 and the slurry rotor 9 to operate simultaneously to compress and shear the tailing slurry;
s3: in the running process, part of flocculating water seeps out through the filter paper 6, and the seeping water is sucked out by using the injector in time;
s4: when the compression piston is observed to be stable and not to descend, recording the end liquid level according to the reading of the scale 2, and simultaneously recording the pressure value and the torque value of the pressure sensor 5 and the torque sensor 12 after being acquired and processed by the data acquisition device 14, wherein the pressure value is the compression yield stress, the torque value is converted into the shear yield stress through a formula, and the concentration of the tailing slurry is obtained through calculation of the initial value and the end value of the scale 2;
s5: continuously increasing the applied pressure to compress, keeping the slurry rotor 9 to rotate continuously, repeating the operation in S4 when the compression piston 4 stops compressing, continuously increasing the pressure to obtain a plurality of groups of pressure values and torque values, and finally obtaining the double rheological properties of compression yield stress and shear yield stress corresponding to different slurry concentrations through conversion;
s6: after the experiment is finished, the experimental device is disassembled and cleaned.
The following describes specific embodiments.
As shown in FIG. 1, the structure of the experimental study device for dual rheological property of high concentration tailing slurry is as above, wherein the diameter of the material containing cylinder 3 is 6cm, the height is 12cm, the distance between the slurry rotor 9 and the bottom sealing cover 10 is 0.5cm, the slurry rotor 9 consists of four blades, the height (H) of each blade is 4cm, and the width (R) of each blade is 1.5cm.
In the application process, the material containing cylinder 3 is added with a known mass concentration w 0 Is fed to a scale 2 with a reading h 0 Simultaneously recording the slurry mass m 0 After the slurry is stabilized, the filter paper 6 and the pressing device 7 are placed, and the driving electricity is started at the same timeThe machine 13 is set to have the rotating speed of 2rpm, filtered water is sucked out by a syringe in time in the compression process, and when the compression piston 4 is not lowered any more, the slurry height h corresponding to the scale 2 is recorded 1 Simultaneously recording the pressure value P of the pressure sensor 5 and the torque sensor 12 after being acquired and processed by the data acquisition device 14 1 And torque value T 1 Wherein the pressure value P 1 Namely the compressive yield stress value, and the shear yield stress is calculated by the formula: τ=t 1 /(2πR 3 * (H/R+2/3)), wherein H is the blade height of the paddle rotor, R is the blade width of the paddle rotor, and the slurry concentration is initially read according to the scale 2, H 0 And terminate reading h 1 Initial mass m 0 Initial concentration w 0 The specific calculation formula is as follows: w (w) 1 ＝m 0 w 0 /(m 0 -ρ w *S(h 0 -h 1 ) Where ρ is w The compression yield stress, the shear yield stress double rheological property and the slurry concentration can be obtained through the experiment and the corresponding formula, then the larger pressure is applied, the continuous compression under the condition of multiple pressures is realized, and the steps are repeated, so that a plurality of groups of compression yield stress, shear yield stress and slurry concentration can be obtained.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (8)
1. The experimental research device for the dual rheological property of the high-concentration tailing slurry is characterized by comprising a compression yield stress testing module, a shear yield stress testing module, a data acquisition module, a bracket, a scale and a material containing cylinder,
the compression yield stress testing module comprises a compression piston, a pressure sensor, filter paper, a pressing device and a pressure transmitter, wherein the pressure sensor is arranged in the compression piston, the filter paper is positioned at the bottom of the compression piston, the compression piston is connected with the pressing device, the pressing device is controlled by the pressure transmitter, and the pressure transmitter is connected with a computer;
the shear yield stress testing module comprises a slurry rotor, a sealing cover, a water blocking plug, a torque sensor and a driving motor, wherein the slurry rotor is positioned in the material containing cylinder, the lower end of the slurry rotor penetrates through the sealing cover at the bottom of the material containing cylinder to be connected with the torque sensor and the driving motor, the slurry rotor and the sealing cover are sealed through the water blocking plug, and the torque sensor is connected with the data acquisition device;
the data acquisition module comprises a data acquisition device and a computer, and the data acquisition device is connected with the computer;
the scaleplate is positioned at one side of the material containing cylinder and is fixed on the bracket;
the material containing cylinder is fixed on the bracket;
recording a pressure value and a torque value of the pressure sensor and the torque sensor after being acquired and processed by a data acquisition device, wherein the pressure value is compression yield stress, the torque value is converted into shear yield stress by a formula, and the concentration of the tailings slurry is obtained by calculating a scale initial value and a termination value;
and continuously increasing pressure to obtain a plurality of groups of pressure values and torque values, and finally obtaining the dual rheological properties of compressive yield stress and shear yield stress corresponding to different slurry concentrations through conversion.
2. The experimental study device for dual rheological properties of high-concentration tailing slurry according to claim 1, wherein the compression yield stress testing module and the shear yield stress testing module are arranged on the same central axis with the material containing cylinder, and the pressing device is required to be positioned on the central position of the compression piston in the compression process, the pressure sensor is positioned on the central position of the compression piston, and the scale zero scale line and the sealing cover at the bottom of the material containing cylinder are arranged on the same horizontal line.
3. The experimental study device for dual rheological properties of high-concentration tailing slurry according to claim 1, wherein the filter paper is positioned at the bottom of the compression piston and above the tailing slurry, and the filter paper is tightly contacted with the inner wall of the containing cylinder to prevent the tailing slurry from leaking out;
the compression piston is made of stainless steel materials, the height of the compression piston is 2cm, the material containing cylinder is made of acrylic materials, friction resistance between the compression piston and the inner wall of the material containing cylinder is eliminated, and the gap between the compression piston and the material containing cylinder is smaller than 0.5mm.
4. The experimental study device for dual rheological properties of high-concentration tailing slurry according to claim 1, wherein the shear yield stress testing module is positioned at the bottom of the material containing cylinder, the driving motor drives the slurry rotor to rotate, the rotating speed is controlled to be 0.5-10rpm, the bottom sealing cover is detachable and is tightly matched with the material containing cylinder, the water blocking plug is tightly matched with the slurry rotor, and water seepage at the bottom is prevented.
5. The experimental study device for dual rheological property of high-concentration tailing slurry according to claim 1, wherein the diameter of the material containing cylinder is 6-8cm, the height of the material containing cylinder is 12-16cm, the slurry rotor is provided with four blades which are arranged at an included angle of 90 degrees, each blade is 1.5cm wide and 4cm high, and the distance between the bottom of each blade of the slurry rotor and the sealing cover is 0.5-1.0cm.
6. The experimental study device for dual rheological properties of high-concentration tailing slurry according to claim 1, wherein the pressing device is controlled by a pressure transmitter, so that a pressure range of 5-10000pa can be tested, the torque sensor and the pressure sensor are connected with a data acquisition device for data acquisition, and the data acquisition device transmits acquired data to a computer.
7. The method for using the dual rheology experimental study device for high concentration tailings slurry according to claim 1, comprising the steps of:
s1: assembling an experimental device, installing a sealing cover, completing corresponding line connection, injecting high-concentration slurry with known concentration and mass into a material containing cylinder, wherein the injection height is 2cm away from an opening at the upper end of the material containing cylinder, and recording the initial liquid level height through a scale;
s2: after the slurry is stable, placing filter paper on the top of the slurry, placing a compression piston on the filter paper, controlling a pressure transmitter through a computer to enable a pressing device to output constant pressure, simultaneously opening a driving motor to drive a slurry type rotor to rotate at constant rotating speed, and enabling the pressing device and the slurry type rotor to simultaneously operate to compress and shear the tailing slurry;
s3: in the running process, part of flocculating water seeps out through the filter paper, and the seeping water is sucked out by using the injector in time;
s4: when the compression piston is observed to be stable and not to descend, recording the end liquid level according to the reading of the scale, and recording the pressure value and the torque value of the pressure sensor and the torque sensor after being acquired and processed by the data acquisition device, wherein the pressure value is the compression yield stress, the torque value is converted into the shear yield stress through a formula, and the concentration of the tailing slurry is obtained through calculation of the initial value and the end value of the scale;
s5: continuously increasing the applied pressure to compress, keeping the slurry rotor to continuously rotate, repeating the operation in S4 when the compression piston stops compressing, continuously increasing the pressure to obtain a plurality of groups of pressure values and torque values, and finally obtaining the double rheological properties of compression yield stress and shear yield stress corresponding to different slurry concentrations through conversion;
s6: after the experiment is finished, the experimental device is disassembled and cleaned.
8. The method for using the dual rheological property experimental study device for the high-concentration tailing slurry, according to claim 7, wherein the concentration of the high-concentration slurry in the S1 is more than or equal to 50%.
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