CN114594027A - Device and method for measuring dynamic settling velocity of high-concentration slurry particles - Google Patents

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

A kind of measuring device and measuring method of dynamic sedimentation velocity of high-concentration slurry particles

technical field

The invention relates to the technical field of sedimentation velocity measurement, in particular to a measurement device and measurement method for the dynamic sedimentation velocity of high-concentration slurry particles.

Background technique

The sedimentation velocity of particles is an important content in the study of slurry flow performance, and it is of great significance for the determination of engineering design parameters such as critical flow velocity and sedimentation law. For low-concentration slurry, a graduated cylinder test is generally carried out to measure the settling velocity of the particle group. However, for high-concentration slurry, the interface between the mud layer is not obvious, and it is difficult to observe the sedimentation law of the particle group through a simple graduated cylinder test, and it is necessary to obtain it indirectly through some non-destructive detection methods. On the other hand, studies have shown that the sedimentation velocity of the particles in the high-concentration slurry is very small under the static state, and can even remain suspended for a long time, but once subjected to dynamic shearing, the sedimentation velocity increases, that is, the particles have a "shear "Cut settlement" effect.

A large number of tailings will be produced in the process of development and utilization of metal mineral resources, which is a key problem that needs to be solved for the sustainable development of the mining industry. High-concentration discharge is a new type of tailings disposal process developed in recent years. area backfill. Because the high-concentration tailings disposal process can effectively reduce the risk of dam failure, improve the utilization rate of backwater, and reduce the impact on the surrounding ecological environment, however, the design of high-concentration tailings discharge engineering has been slow to progress, and a high-concentration slurry particle dynamics is urgently needed. Settling velocity measurement device to provide design reference.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a measuring device and measuring method for the dynamic sedimentation velocity of high-concentration slurry particles, so as to solve the problems existing in the above-mentioned prior art, and make the research on the sedimentation velocity and law of the particle group easier and faster.

For achieving the above object, the present invention provides following scheme:

The invention provides a device for measuring the dynamic settling velocity of high-concentration slurry particles, comprising 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, The 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, and the outer cylinder is at least in the vertical direction. Two conductivity detection mechanisms are provided, and the conductivity detection mechanisms are connected in communication with the data collector.

Preferably, the outer cylinder comprises an upper cylinder and a lower cylinder which are sealed and connected, the material of the upper cylinder is transparent plexiglass, the material of the lower cylinder is PVC, and the upper cylinder is connected with a top cover by bolts, The bottom of the lower cylinder is connected with a base through bolts.

Preferably, the lower cylinder is provided with two upper and lower detection surfaces, and each of the detection surfaces includes a plurality of the electrical conductivity detection mechanisms uniformly distributed along the circumferential direction of the lower cylinder.

Preferably, the distance between the two detection surfaces is 50 mm, and the conductivity detection mechanism is a conductivity detection probe.

Preferably, each of the detection surfaces is provided with six conductivity detection mechanisms, the data collector is a multi-channel data collector, and each conductivity detection mechanism is connected in communication with the data collector .

Preferably, both ends of the inner cylinder are provided with protruding cones, the cones are connected with the rotating shaft of the rotating mechanism, and the inner cylinder and the outer cylinder are coaxially sleeved.

Preferably, the gap between the inner cylinder and the outer cylinder is 8mm-12mm.

Preferably, the rotating mechanism includes a deceleration motor and a rotating shaft, the decelerating motor is fixed on the outer cylinder, and the rotating shaft is arranged on both ends of the inner cylinder.

The present invention relates to a method for measuring the dynamic settling velocity of high-concentration slurry particles. Based on the above-mentioned measuring device for the dynamic settling velocity of high-concentration slurry particles, the following steps are included:

In the first step, after fully stirring the sample of the high-concentration slurry prepared according to the designed mass fraction, open the top cover of the outer cylinder, slowly pour the sample into the outer cylinder, and install the inner cylinder to the In the outer cylinder, the annular gap between the inner cylinder and the outer cylinder is filled with the sample;

In the second step, turn on the motor and obtain the rotational speed n of the motor, then the linear speed of the sample rotation in the annular gap is ΔU=2πnr, and the shear rate in the flow field is γ=ΔU/ΔL, so The inner cylinder is rotated under the driving of the motor, and the data collector starts data collection;

The third step is to observe the change of the conductivity of the two detection surfaces, and record the interval time Δt between the peaks of the conductivity of the two detection surfaces, which is the sedimentation time of the particle population, and the distance between the two detection surfaces is ΔH , then the average sedimentation velocity of the particle population can be calculated ω=ΔH/Δt.

Preferably, in the second step, the rotational speed of the motor can be adjusted according to the experimental design rotational speed n; in the third step, after the end of the test, open the top cover of the outer cylinder, and pour all the samples into out, and rinse the outer and inner cylinders with water.

The present invention has achieved the following technical effects with respect to the prior art:

Based on the principle related to the slurry concentration and its electrical conductivity, the invention designs a shear settlement test device, realizes the research on the dynamic settlement characteristics of non-Newtonian slurry particles, and further realizes the determination of parameters such as critical flow rate, accumulation slope, etc. Concentration emission engineering design provides a reference basis.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some of the present invention. In the embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is the structural representation of the measuring device of the dynamic settling velocity of high-concentration slurry particles of the present invention;

Fig. 2 is the structural representation of A-A (detection surface) in Fig. 1 of the present invention;

Fig. 3 is the schematic diagram of the change curve of conductivity with detection time in the present invention;

Among them: 1-gear motor, 2-rotating shaft, 3-base, 4-top cover, 5-upper cylinder, 6-lower cylinder, 7-detection surface, 8-inner cylinder, 9-data collector, 10-conductivity Check the probe.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The purpose of the present invention is to provide a measuring device and measuring method for the dynamic settling velocity of high-concentration slurry particles, so as to solve the problems existing in the prior art and make the research on the settling velocity and law of the particle group easier and faster.

In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

As shown in Figures 1 to 3: this embodiment provides a device for measuring the dynamic sedimentation velocity of high-concentration slurry particles, including a rotating mechanism, an inner cylinder 8, an outer cylinder, a conductivity detection mechanism and a data collector 9. The cylinder 8 is sleeved in the outer cylinder, the two ends of the inner cylinder 8 are rotatably arranged on the end face of the outer cylinder, the inner cylinder 8 is connected with a rotating mechanism, and the rotating mechanism is arranged on the outer cylinder, and the outer cylinder is provided with at least two in the vertical direction. There is a conductivity detection mechanism, and the conductivity detection mechanism is connected with the data collector 9 in communication.

The outer cylinder includes an upper cylinder 5 and a lower cylinder 6 which are sealed and connected. The material of the upper cylinder 5 is transparent plexiglass, so that the state during the test can be observed. The material of the lower cylinder 6 is PVC, and the upper cylinder 5 is connected by bolts. There is a top cover 4, and the bottom of the lower cylinder 6 is connected with a base 3 by bolts, which is convenient for disassembly and assembly.

The lower cylinder 6 is provided with two upper and lower detection surfaces 7 , and each detection surface 7 includes a plurality of conductivity detection mechanisms uniformly distributed along the circumferential direction of the lower cylinder 6 . The distance between the two detection surfaces 7 is 50 mm, and the conductivity detection mechanism is a conductivity detection probe 10 . Each detection surface 7 is provided with six conductivity detection mechanisms, and each conductivity detection mechanism is connected to the data collector 9 in communication. The data collector 9 is a multi-channel data collector with multiple data interfaces, which can The detection data of the conductivity detection probe 10 is collected and recorded in real time.

Both ends of the inner cylinder 8 are provided with protruding cones, the cones are connected with the rotating shaft 2 of the rotating mechanism, and the inner cylinder 8 and the outer cylinder are coaxially sleeved to prevent relative movement of the inner cylinder 8 during rotation. The gap 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. The rotating mechanism includes a deceleration motor 1 and a rotating shaft 2 , the decelerating motor 1 is fixed on the outer cylinder, and the rotating shaft 2 is arranged on both ends of the inner cylinder 8 .

The present invention relates to a method for measuring the dynamic settling velocity of high-concentration slurry particles. Based on the above-mentioned measuring device for the dynamic settling velocity of high-concentration slurry particles, the following steps are included:

In the first step, after fully stirring the sample of high-concentration slurry prepared according to the designed mass fraction, open the top cover 4 of the outer cylinder, slowly pour the sample into the outer cylinder, and install the inner cylinder 8 to the outer cylinder Inside, the annular gap between the inner cylinder 8 and the outer cylinder is filled with the sample.

In the second step, turn on the motor and obtain the speed n of the motor, then the linear speed of the sample rotation in the annular gap is △U=2πnr (r is the radius of rotation, which is about the average value of the radius of the inner cylinder and the outer cylinder), and the flow field The medium shear rate is γ=ΔU/ΔL, the inner cylinder 8 is rotated under the driving of the motor, and the data collector 9 starts data collection. In the calculation of shear rate, under different shear rates, the sedimentation speed of the slurry particles is different. By adjusting the motor speed n, the test device can be used to measure the sedimentation speed of the particles in the test slurry under a certain shear rate. Settling velocity is dynamic. When the inner cylinder 8 rotates, data acquisition is started, and the data changes of the two detection sections are observed. When the particles settle and pass through the upper detection section, the mass fraction of this area increases, and at the same time, the conductivity increases, the particles continue to settle, and the conductivity decreases; when the particles pass through the lower detection section, the conductivity also increases and then decreases. changing trend. Among them, the rotational speed of the motor can be adjusted according to the experimental design rotational speed n.

The third step is to observe the change of the conductivity on the two detection surfaces 7, and record the interval time Δt between the two detection surfaces 7 when the conductivity peaks appear, which is the sedimentation time of the particle population, and the distance between the two detection surfaces 7 is ΔH, then the average sedimentation velocity ω=ΔH/Δt of the particle population can be calculated. After the test, open the top cover 4 of the outer cylinder, pour out all the samples, and rinse the outer cylinder and the inner cylinder 8 with water.

This embodiment is based on the principle of the correlation between the mass fraction of the slurry and its electrical conductivity. By observing the changes of the electrical conductivity of the upper and lower detection surfaces 7, the settling time of the particle group on the distance between the detection surfaces 7 is obtained, and finally the sedimentation of the particle group is obtained. At the same time, through the setting of the inner and outer cylinders, a shear flow field is formed in the annular space, and the study of the dynamic settlement law is realized.

In this specification, specific examples are used to illustrate the principles and implementations of the present invention, and the descriptions of the above embodiments are only used to help understand the method and the core idea of the present invention; There will be changes in the specific implementation manner and application scope of the idea of the invention. In conclusion, the contents of this specification should not be construed as limiting the present 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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