CN113049447A - Full tailing paste structure rheology experiment system and method - Google Patents
Full tailing paste structure rheology experiment system and method Download PDFInfo
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- TVZPLCNGKSPOJA-UHFFFAOYSA-N copper zinc Chemical compound [Cu].[Zn] TVZPLCNGKSPOJA-UHFFFAOYSA-N 0.000 description 2
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
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- 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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- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
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Abstract
The invention provides a full-tailing paste structure rheology experimental system and a full-tailing paste structure rheology experimental method, which comprises a container, wherein a stress-strain testing mechanism and an observation mechanism are arranged in the container, the observation mechanism is obliquely arranged in the container, the observation direction of the observation mechanism is opposite to the test direction of the stress-strain testing mechanism, the rheological curves, the grain diameters and the quantity changes of the paste under different rheological characteristics are obtained through the stress-strain testing mechanism and the observation mechanism, the rheological curves under the different rheological characteristics of the paste are analyzed, the microstructure change trend is judged through the grain diameter and the quantity changes, and the state analysis of the paste under the different rheological characteristics is further achieved, so that the complex rheological behavior of the paste is better understood, the system can be used for guiding the design of a mine paste conveying pipeline and the prediction of pumping energy requirements, and research means is provided for the.
Description
Technical Field
The invention relates to the technical field of mine filling, in particular to a full tailing paste structure rheology experimental system and method.
Background
In the field of mine filling, rheology is often used to evaluate the transport performance of paste filling, and pipeline design and pump energy demand prediction rely on knowledge of paste flow behavior; at present, in a paste filling experiment, a rheometer is mostly used as a shearing power source, wherein in the patent application number of 201910855444.6 and the patent name of 'a device for detecting the dehydration performance of tailings based on the rheometer and a using method', the rheometer and a dehydration component are disclosed to be used for measuring the dynamic dehydration concentration of the tailings, and monitoring various parameters such as torque, shearing force, viscosity and the like in the dehydration process in the whole process, so that basis and guidance are provided for the dynamic dehydration of the tailings and the safe operation of deep cones; however, the microstructure of the paste is currently known mostly from guessing or limited experiments, and particularly when the sample is subjected to shear (i.e. mixing and pumping), the microstructure is broken under shear disturbance, so that the paste shows non-newtonian rheological behaviors of shear thickening, shear thinning and the like.
The research experiments are less when the paste shows non-Newtonian rheological behaviors such as shear thickening, shear thinning and the like, mainly because the microstructure of fresh slurry is very difficult to know, and the difficulty of monitoring the microstructure of the paste in situ is that the concentration is high, the hydration and the transmissivity are low and the influence is easy to occur; for example, in patent application No. 201810816589.0, the patent name "a full-tailing paste stirring homogeneity on-line monitoring system and use method", there are disclosed a method using a stirring system, an image acquisition and analysis system, and a feedback system, the image acquisition and analysis system is provided with a camera, image analysis software, and other components, the standard deviation of the gray scale distribution of a sheet at different time points calculated in the image acquisition and analysis system is used, a standard deviation scatter diagram changing with time is displayed, whether the standard deviation exceeds a stable range is judged, and the effect of paste homogeneity detection is achieved by using data in the scatter diagram as a judgment standard for whether the paste is homogeneous or not, but the prior art mentioned above adopts an image algorithm to obtain the characteristics after paste stirring, and although the microstructure of the surface of the paste can be measured, few people observe and measure in situ in the suspension with low light transmittance, the method is not suitable for microstructure change experiments of fresh slurry, so that a paste-in-situ detection microstructure experiment design scheme which is high in concentration, low in hydration and transmissivity and easy to influence needs to be designed urgently.
Disclosure of Invention
The invention provides a full tailing paste structure rheology experimental system and a full tailing paste structure rheology experimental method, aiming at the technical problems that the prior knowledge of the microstructure in fresh slurry is difficult, the experiment for the change of the microstructure of a paste is lacked, and especially, when a sample is sheared (namely mixed and pumped), the microstructure is cracked under shearing disturbance to analyze the experimental phenomenon.
In order to solve the above problems, the technical solution of the present invention is realized as follows:
the utility model provides a complete tailings lotion structure rheology experimental system, includes the container, is provided with stress-strain test mechanism and observation mechanism in the container, and observation mechanism slope sets up in the container and observation mechanism's observation direction is opposite with stress-strain test mechanism test direction.
Preferably, the stress-strain testing mechanism comprises a rheometer which is arranged in the container and is connected with the control host; the observation structure comprises a laser observation assembly, the laser observation assembly is obliquely arranged in the container, the observation direction of the laser observation assembly is opposite to the test direction of the stress-strain test mechanism, and the laser observation assembly is connected with the control host through a data acquisition instrument.
Preferably, the rheometer comprises a paddle rotor, a micro motor and an angle rotary encoder, wherein the micro motor is connected with the paddle rotor, the paddle rotor is arranged in the container, the angle rotary encoder is installed on the micro motor, and the micro motor and the angle rotary encoder are both connected with the control host.
Preferably, the difference in height between the paddle rotor bottom and the bottom of the vessel is greater than the diameter of the paddle rotor, the difference in height between the upper portion of the paddle rotor and the upper portion of the vessel is at least two times greater than the diameter of the paddle rotor, and the diameter of the vessel is at least three times greater than the diameter of the paddle rotor.
Preferably, the laser observation assembly comprises a laser, a beam expander, an optical device, a Fourier lens and a probe window, the laser is matched with the beam expander, the beam expander is matched with the Fourier lens through the optical device, the Fourier lens is matched with the probe window, the probe window is arranged in the container in an inclined manner of 45 degrees, the detection direction of the probe window is opposite to the test rotation direction of the rheometer, and the laser is connected with the control host through a data acquisition instrument.
A full tailing paste structure rheology experimental method comprises the following steps:
s1, firstly, a rheometer in the stress-strain test system and a probe window in the laser observation assembly are shot into the paste in the container, then the laser is started, and the rheometer is controlled to rotate at different shear rates by the control host after the laser is started for 10 seconds;
s2, transmitting a particle size signal of the paste detected by the laser in the working process of the rheometer to the control host, calculating the particle size signal by the control host, wherein the particle size signal comprises the number n of floccules and particles detected in real time per second and the average particle size D of the floccules or the particles,
n is the total number of the measured particles and flocs, and dn is the particle size of the nth particle or floc; the control host calculates the particle size M according to the time t of obtaining the particle size reflection pulse signal and the rotating speed v, wherein M is v multiplied by t, so that the particle size distribution condition of the paste is obtained, and the control host records and stores the detected particle size information of the paste;
s3, according to the step S1, the control host derives the shear stress and shear rate curve of the rheometer in real time through data acquisition and processing software in the process that the rheometer rotates at different shear rates;
s4, according to the steps S1-S3, when the test solid characteristics affect the start of the paste filling pump after the paste filling pump is stopped: adopting high-concentration paste, and adjusting the shear rate of the rheometer to 50s by controlling a main machine-1In the low-shear range, the control host derives a stress-shear rate curve in real time, and the microstructure characteristic particle size and the quantity of the paste are obtained through the control host;
s5, analyzing the solid-liquid conversion process according to the stress-shear rate curve in the step S4 and the change of the microstructure of the paste, obtaining the yield stress and the shear rate corresponding to the change moment of the characteristic grain diameter of the microstructure of the paste in the observation result through the control host, and calculating the pressure of the pump stop and restart according to the yield stress and the shear rate by adopting a rheological model;
s6, according to the steps S1-S3, when the shear thinning characteristic of the paste is tested: the shear rate of the rheometer is adjusted to be 50-120s by controlling the host-1Meanwhile, the control host derives a stress-shear rate curve in real time, the microstructure characteristic particle size and the quantity of the paste are obtained through the control host, the microstructure change of the paste is shown when the shear thinning characteristic is shown through the stress-shear rate curve, and the reason for shear thinning of the paste is judged by combining the change of the microstructure;
s7, according to the steps S1-S3, when testing the Binghan body characteristics of the paste: the shear rate of the rheometer is adjusted at 120-400s by controlling the host-1Meanwhile, the control host derives a stress-shear rate curve in real time, and the Binghan body characteristic of the paste is analyzed by analyzing the stress-shear rate curve and the change trend of the microstructure;
s8, according to the steps S1-S3, when the characteristic of the cream swelling fluid is tested: adjusting the shear rate of the rheometer to 400s by controlling the host-1The control host computer derives the stress-shear rate curve and the characteristic grain diameter and the quantity of the microstructure of the paste in real time, and analyzes the stress-shear rate curve and the microstructure change trendProvides basis for high-speed activation stirring and reasonable stirring speed.
Compared with the prior art, the invention has the beneficial effects that:
the invention monitors the particle size change of the paste in the container and the rheological characteristics under the shearing action in real time by controlling the operation of the rheometer and the laser observation equipment by one control host, realizes the dynamic response of the microstructure of the paste when the paste is sheared by experiments, solves the technical problem that few people can observe and measure the paste in situ in low-light-transmittance suspension at present by utilizing the laser observation equipment, can be applied to in-situ observation without sampling by utilizing the laser observation equipment, reveals the particle conditions including the change of the particle number and size and the particle size distribution by measuring the particle number and the particle size distribution, thereby better understanding the complex rheological behavior of the paste, can be used for guiding the design of a mine paste conveying pipeline and the prediction of the pumping energy requirement, and provides a research means for the development of the rheology of the paste.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of the operation of the laser observation assembly of the present invention.
Fig. 2 is a schematic view of the overall structure of the present invention.
Fig. 3 is a view from a-a of fig. 2.
In the figure, 1 is a control host, 2 is a data acquisition instrument, 3 is a laser observation component, 31 is an optical device, 32 is a Fourier lens, 33 is a probe window, 4 is a micro motor, 5 is an angle rotary encoder, 6 is a paddle rotor, 7 is a container, and 8 is a paste.
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.
Example 1: as shown in fig. 1, the rheological experiment system for the structure of the full-tailing paste comprises a container 7, wherein a stress-strain testing mechanism and an observation mechanism are arranged in the container 7, the observation mechanism is obliquely arranged in the container 7 and is used for improving the representativeness of a test result, the observation direction of the observation mechanism is opposite to the testing direction of the stress-strain testing mechanism, the stress-strain testing mechanism and the observation mechanism are both connected with a control host 1, the stress-strain testing system is used for obtaining the strain characteristics of a paste sample under the action of stress, and the observation mechanism is used for obtaining relevant parameters of a slurry microstructure, including single particles, particle aggregates, flocs and the like.
The stress-strain testing mechanism comprises a rheometer, the rheometer adopts an R/S four-paddle rotating rheometer, and in the process, a four-paddle rotor is immersed in the paste and rotates at different shearing rates. The process is carried out under real-time monitoring, and a shear stress curve and a shear rate curve of a rheometer are derived through software so as to be further analyzed, wherein the rheometer is arranged in the container 7 and is connected with the control host 1; the rheometer includes paddle rotor 6, micro motor 4 and angle rotary encoder 5, and micro motor 4 is connected with paddle rotor 6, and paddle rotor 6 sets up in container 7, and in order to eliminate the boundary effect in the experimentation in the use, the container size of dress sample and the inserted degree of depth of rotor should follow following principle: as shown in fig. 3, the height difference Z2 between the bottom of the paddle rotor 6 and the bottom of the container 7 is greater than the diameter D of the paddle rotor 6, i.e. Z2 > D, the height difference Z1 between the upper part of the paddle rotor 6 and the upper part of the container 7 is at least greater than two times the diameter D of the paddle rotor 6, i.e. Z1 > 2D, the diameter Dt of the container 7 is at least greater than three times the diameter D of the paddle rotor 6, i.e. Dt > 3D, the micro motor 4 is provided with the angular rotary encoder 5, and both the micro motor 4 and the angular rotary encoder 5 are connected with the control main machine 1.
As shown in fig. 2, the observation structure includes a laser observation component 3, the laser observation component 3 is obliquely arranged in a container 7, the observation direction of the laser observation component 3 is opposite to the test direction of the stress-strain test mechanism, and the laser observation component 3 is connected with the control host 1 through a data acquisition instrument 2; the laser observation assembly 3 comprises a laser, a beam expander, an optical device 31, a Fourier lens 32 and a probe window 33, the laser is matched with the beam expander, the beam expander is matched with the Fourier lens 32 through the optical device 31, the Fourier lens 32 is matched with the probe window 33, the laser emits laser when in use, an expanded ideal light beam of illumination scattering particles is obtained after passing through the beam expander, the laser accuracy is improved through the optical device, then the light beam is focused through the Fourier lens and enters a sample through the probe window, when the laser meets flocs or particles, the laser can be reflected back and returns back to the laser again, then an electric signal obtained by laser observation equipment is converted into a numerical signal through a data acquisition instrument, and the numerical signal is input into a computer for recording and storing.
The sample container is provided with a hole, the diameter of the hole is slightly larger than that of the probe, the probe extends into the sample container through the hole and is sealed by rubber, in order to ensure that data obtained by the laser probe is representative, the probe can detect a larger spatial range, therefore, a facility probe window and the wall of the sample container are installed at an inclination angle of 45 degrees, the probe is positioned in the middle of a blade of the rheometer in the vertical direction, the detection direction of the probe window 7 is opposite to the test rotation direction of the rheometer, the laser is connected with a control host 1 through a data acquisition instrument 2, and in the experimental process, the control host records the data measured by the laser equipment once every 10 seconds. The distance between the probe and the blade of the rheometer is controlled to be 1-2mm, so that the probe is ensured not to collide in the working process of the rheometer, the microstructure evolution process of the paste under the shearing action can be monitored, the diameter of the probe is controlled to be smaller than 9mm, and the influence of a microstructure observation device on the rheometer in the test process is eliminated.
Example 2: a full tailing paste structure rheology experimental method comprises the following steps:
s1, firstly, a rheometer in the stress-strain testing system and a probe window 33 in the laser observation assembly 3 are shot into the paste 8 in the container 7, then, a laser is started, and after the laser is started for 10 seconds, the rheometer is controlled to rotate at different shear rates by the aid of the control host 1;
s2, transmitting a characteristic signal of the particle size of the paste detected by the laser in the working process of the rheometer to the control host 1, calculating and processing the particle size signal by the control host 1, wherein the particle size signal comprises the number n of flocs and particles detected in real time per second and the average particle size D of the flocs or the particles,
n is the total number of particles and flocs measured, dnThe particle size of the nth particle or floc is measured; the laser sends out laser, behind the beam expander, obtains an expanded, illumination scattering particle idealization light beam, improves laser accuracy through optical device, and then the light beam is through the focus of Fourier camera lens, in the sample is absorbed to probe window, can be reflected back when laser meets wadding or granule, gets back again in the laser and is noted, has just so obtained a set of pulse signal, and pulse signal's time is t, and speed is v, then the particle diameter is D ═ v × t, can obtain the particle size distribution condition of sample from this. The control host 1 calculates the particle size M, where M is v × t, according to the time t of obtaining the particle size pulse signal and the rotating speed v, so as to obtain the particle size distribution of the paste 8, and the control host 1 records and stores the detected particle size information of the paste 8;
s3, according to the step S1, in the process that the rheometer rotates at different shear rates, the control host 1 derives a shear stress and shear rate curve of the rheometer in real time through data acquisition and processing software, wherein the data acquisition and processing software comprises Excel, MATLAB, Origin and the like, and the shear stress and shear rate curve of the rheometer is derived in working engineering so as to be further analyzed;
s4, according to the steps S1-S3, when the test solid characteristics affect the start of the paste filling pump after the paste filling pump is stopped: adopts high-concentration paste, and adjusts the shear rate of the rheometer to 50s by controlling the main machine 1-1Within a low shear rangeThe control host 1 derives a stress-shear rate curve in real time, and the microstructure characteristic particle size and the quantity of the paste are obtained through the control host;
s5, analyzing the solid-liquid conversion process according to the stress-shear rate curve in the step S4 and the change of the microstructure of the paste, obtaining the yield stress and the shear rate corresponding to the change moment of the microstructure characteristic particle size of the paste in the observation result through the control host 1, and calculating the pressure of the pump stop and restart according to the yield stress and the shear rate by adopting a rheological model;
s6, according to the steps S1-S3, when the shear thinning characteristic of the paste is tested: the shear rate of the rheometer is adjusted to be 50-120s by controlling the main machine 1-1Meanwhile, the control host 1 derives a stress-shear rate curve in real time, the microstructure characteristic particle size and the quantity of the paste are obtained through the control host, the microstructure of the paste changes when the stress-shear rate curve shows shear thinning characteristics, the reason for shear thinning of the paste is judged by combining whether the microstructure changes, and an analysis result can be used for guiding field production;
s7, according to the steps S1-S3, when testing the Binghan body characteristics of the paste: the shear rate of the rheometer is adjusted to be 120-400s by controlling the host 1-1Meanwhile, the control host 1 derives a stress-shear rate curve in real time, and the Binghan body characteristic of the paste is analyzed by analyzing the stress-shear rate curve and the change trend of the microstructure;
s8, according to the steps S1-S3, when the characteristic of the cream swelling fluid is tested: the shear rate of the rheometer is adjusted to 400s by controlling the main machine 1-1In the above, the control host 1 derives the stress-shear rate curve and the characteristic particle size and quantity of the microstructure of the paste in real time, and analyzes the stress-shear rate curve and the microstructure variation trend to provide a basis for high-speed activation stirring reasonable stirring speed.
Example 3: the sedimentary copper ore has fine full-tailing granularity, the prepared paste has high viscosity, the yield stress is high, the mass concentration is 76%, the ash-sand ratio is 1:5, 484.9Pa is reached, and the pump pressure required by a filling system is calculated to be 36.3MPa theoretically. The maximum pump pressure of the selectable plunger pump is 15Mpa, the paste cannot be conveyed by the pump pressure, and the pipeline is resistant to the maximum pressureThe pressure was 20 MPa. Therefore, the paste is required to be conveyed and drag-reduced through the admixture, and the filling strength is required to be ensured on the premise of not enhancing the filling cost; therefore, the pumping agent is developed to improve the conveying performance, and the filling concentration is increased so as to reduce the cement consumption, thereby controlling the filling cost; firstly, putting the prepared paste into a beaker, then putting a rheometer and a laser probe into the beaker, enabling the paste to be under a stress-strain test system and a microstructure laser observation system, starting the paste microstructure laser observation system 10 seconds before the rheometer starts to work, and controlling the shear rate to be a constant value of 180s-1Testing the microstructures and rheological characteristics of the pastes with different types and dosages of pumping agents and different concentrations; the stress-strain testing system derives a relation graph of shearing stress and shearing rate, and the microstructure laser observation system derives a change graph of the microstructure of the paste; through data analysis, when the mass concentration of the paste added with 1% of pumping agent is 80% and the ratio of ash to sand is 1:8, the microstructure is dispersed, the yield stress is 156.3Pa, the pump pressure required by a paste conveying system is calculated to be 11.7MPa theoretically, and the conveying requirement is met. Simultaneously, the filling strength of the paste meets the safety requirement, and the filling cost is reduced by 2.1 yuan/m due to the reduction of the cement consumption3。
After the technology is adopted, the filling quality is improved, the filling cost is reduced, and the technical problem that the high-mud content and high-viscosity tailing paste cannot be conveyed after being filled is solved. The invention is simple and convenient to apply and brings considerable economic benefit to mines.
Example 4 a copper-zinc mine was mined for many years, the mine was filled with low-concentration water sand from a conventional vertical sand silo, and the copper-zinc mine was pumped with a pump pressure of 5MPa to deliver the slurry. With the increase of the mining depth, after the mining enters the deep part for mining, the low-concentration filling has high cost and low strength, and cannot meet the safety requirement, so that the filling is prepared to be transformed into paste filling. However, there is a fear that the filling concentration is increased, which may result in that the paste cannot be delivered at the rated pump pressure of the conventional pump. Therefore, theoretical calculation must be performed before the system is modified and upgraded; by applying the present invention, the shear rate is set to 0 to 120s-1Linearly increasing, carrying out rheological test, acquiring microstructure change in the rheological test process, and finding out the paste prepared from the tailingsThe body has obvious shear thinning characteristic at low shear rate, the yield stress of the paste body at 78% concentration is 112Pa, and the pump pressure required by a mine paste filling and conveying system can be calculated to be 3.2MPa by combining an H-B model, which is far less than the maximum pump pressure value of the existing pump. Therefore, on the premise that the pump is not additionally arranged, the filling system is transformed into the paste filling system, the cost of upgrading and transforming the paste system is greatly reduced, and considerable economic benefit is brought to the mine.
After the technology is adopted, the improvement and the upgrade of an old filling system are realized, the paste filling pumping system operates stably, the original pump can sufficiently convey paste slurry, the unnecessary investment waste is avoided, and the investment cost of about 500 ten thousand is saved for an ore mountain.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. The full-tailing paste structure rheology experimental system is characterized by comprising a container (7), wherein a stress-strain testing mechanism and an observation mechanism are arranged in the container (7), the observation mechanism is obliquely arranged in the container (7), the observation direction of the observation mechanism is opposite to the test direction of the stress-strain testing mechanism, and the stress-strain testing mechanism and the observation mechanism are both connected with a control host (1).
2. The full-tailing paste structure rheology experimental system according to claim 1, characterized in that the stress-strain testing mechanism comprises a rheometer, the rheometer is arranged in the container (7) and is connected with the control host (1); the observation structure comprises a laser observation assembly (3), the laser observation assembly (3) is obliquely arranged in the container (7), the observation direction of the laser observation assembly (3) is opposite to the stress-strain testing mechanism testing direction, and the laser observation assembly (3) is connected with the control host (1) through the data acquisition instrument (2).
3. The full-tailing paste structure rheology experimental system according to claim 2, characterized in that the rheometer comprises a paddle rotor (6), a micro motor (4) and an angle rotary encoder (5), wherein the micro motor (4) is connected with the paddle rotor (6), the paddle rotor (6) is arranged in a container (7), the angle rotary encoder (5) is installed on the micro motor (4), and the micro motor (4) and the angle rotary encoder (5) are both connected with the control host (1).
4. The whole tailings paste structure rheology experimental system according to claim 3, characterised in that the difference in set height between the bottom of the paddle rotor (6) and the bottom of the container (7) is larger than the diameter of the paddle rotor (6), the difference in set height between the upper part of the paddle rotor (6) and the upper part of the container (7) is at least two times larger than the diameter of the paddle rotor (6), and the diameter of the container (7) is at least three times larger than the diameter of the paddle rotor (6).
5. The experimental system for the rheology of the full-tailing paste structure according to claim 2, wherein the laser observation assembly (3) comprises a laser, a beam expander, an optical device (31), a Fourier lens (32) and a probe window (33), the laser is matched with the beam expander, the beam expander is matched with the Fourier lens (32) through the optical device (31), the Fourier lens (32) is matched with the probe window (33), the probe window (33) is arranged in the container (7) in an inclined manner by 45 degrees, the detection direction of the probe window (7) is opposite to the test rotation direction of the rheometer, and the laser is connected with the control host (1) through the data acquisition instrument (2).
6. The experimental method for the structure rheology of the full tailings paste according to any one of claims 1 to 5, characterized by comprising the following steps:
s1, firstly, a rheometer in the stress-strain testing system and a probe window (33) in a laser observation assembly (3) are shot into a paste body (8) in a container (7), then a laser is started, and after the laser is started for 10 seconds, a control host (1) is used for controlling the rheometer to rotate at different shear rates;
s2, detecting the particle size signal of the paste by a laser in the working process of the rheometerTransmitted to a control host (1), the control host (1) calculates and processes the particle size signals, the particle size signals comprise the number n of floccules and particles detected in real time per second, the average particle size D of the floccules or the particles,
n is the total number of particles and flocs measured, dnThe particle size of the nth particle or floc is measured; the control host (1) calculates the particle size M according to the time t of obtaining the particle size reflection pulse signal and the rotating speed v, wherein M is v multiplied by t, so that the particle size distribution condition of the paste (8) is obtained, and the control host (1) records and stores the detected particle size information of the paste (8);
s3, according to the step S1, in the process that the rheometer rotates at different shear rates, the control host (1) derives a shear stress curve and a shear rate curve of the rheometer in real time through data acquisition and processing software;
s4, according to the steps S1-S3, when the test solid characteristics affect the start of the paste filling pump after the paste filling pump is stopped: adopts high-concentration paste, and adjusts the shear rate of the rheometer to 50s by controlling the main machine (1)-1Within the low shear range, the control host (1) derives a stress-shear rate curve in real time, and the microstructure characteristic particle size and the quantity of the paste are obtained through the control host;
s5, analyzing the solid-liquid transition process according to the stress-shear rate curve in the step S4 and the change of the microstructure of the paste, obtaining the yield stress and the shear rate corresponding to the change moment of the microstructure characteristic particle size of the paste in the observation result through the control host (1), and calculating the pressure of the pump stop and restart according to the yield stress and the shear rate by adopting a rheological model;
s6, according to the steps S1-S3, when the shear thinning characteristic of the paste is tested: the shear rate of the rheometer is adjusted to be 50-120s by controlling the main machine (1)-1Meanwhile, the control host (1) derives a stress-shear rate curve in real time, the control host obtains the characteristic grain diameter and the quantity of the microstructure of the paste, the microstructure of the paste changes when the stress-shear rate curve shows shear thinning characteristics, and the paste is judged according to whether the microstructure changes or notThe reason for shear thinning of the body;
s7, according to the steps S1-S3, when testing the Binghan body characteristics of the paste: the shear rate of the rheometer is adjusted to be 120-400s by controlling the host (1)-1The control host (1) derives a stress-shear rate curve in real time, and the characteristic analysis of the Binghan body of the paste is further realized by analyzing the stress-shear rate curve and the change trend of the microstructure;
s8, according to the steps S1-S3, when the characteristic of the cream swelling fluid is tested: the shear rate of the rheometer is adjusted to 400s by controlling the main machine (1)-1The control host (1) derives the stress-shear rate curve and the microstructure characteristic particle size and quantity of the paste in real time, and analyzes the stress-shear rate curve and the microstructure change trend to provide a basis for high-speed activation stirring reasonable stirring speed.
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