A kind of ore pulp liquid level, density detection device and liquid level detection method

Abstract

The application provides a pressure slurry liquid level and density detection device and a liquid level detection method, which comprises a detection pipe group, the detection pipe group comprises an overflow pipe, a first air guide pipe and a second air guide pipe, the overflow pipe is provided with an overflow hole, the first end of the first air guide pipe and the second air guide pipe is closed, the second end is open, the side wall of the first air guide pipe and the second air guide pipe is further provided with a vent hole, the first air guide pipe and the second air guide pipe are parallel and arranged in the overflow pipe, the first air guide pipe and the second air guide pipe are communicated with the overflow pipe through the vent hole, an air inlet unit is used for connecting the first air guide pipe, a pressure detection unit is used for detecting the exhaust pressure of the second end of the second air guide pipe, the detection pipe group is provided with n groups, the overflow holes in the n groups of detection pipe groups are located at different heights, the application characterizes hydraulic pressure by air pressure, can effectively avoid the corrosion of the slurry sensor, reduces the interference of stirring and bubbles in the flotation tank, and can accurately obtain the slurry liquid level and density.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flotation, in particular to a flotation slurry liquid level and density detection device and a liquid level detection method. BACKGROUND

[0002] Flotation is an important process in the beneficiation process, and target substances can be separated through flotation. In the flotation process, the flotation liquid level and the flotation slurry concentration have a great influence on the subsequent target mineral grade. When the flotation liquid level is lower than the set range, the scraper of the flotation machine cannot collect enough foam with target minerals, thereby directly affecting the operation cycle of the flotation system; when the flotation liquid level is higher than the set range, the slurry in the flotation machine will overflow, thereby causing safety problems. The slurry concentration is one of the key parameters for guiding the dosage and incoming material quantity in the flotation process. Therefore, accurate detection of the liquid level of the flotation machine and the slurry density is crucial to stabilize the flotation system.

[0003] Due to the characteristics of the flotation process, the flotation tank contains a large amount of gas, and due to stirring, the disturbance in the tank is strong, and the slurry is strongly acidic, which makes it difficult to detect the slurry liquid level and the slurry density.

[0004] Currently, the detection of the slurry liquid level height mainly relies on the experience of operators, and the liquid level is adjusted by judging the position of the foam and adjusting the opening and closing of the valve. This method is greatly affected by subjectivity and is difficult to maintain the stability of the liquid level height. As for the slurry density, there are currently two ways of manual detection and instrument detection, of which instrument detection is divided into contact and non-contact. The contact detection instrument refers to the direct contact between the slurry liquid level and density detection device and the slurry, such as the float type density meter. Since the flotation slurry is in a strongly acidic environment, this method reduces the service life of the instrument. The non-contact detection instrument is mainly ultrasonic density meter and isotope density meter. The former has low accuracy in the presence of bubbles in the flotation tank, and the latter involves radioactive rays, which have certain danger and high requirements for the use environment, so it is rarely used in actual slurry detection.

[0005] Therefore, there is a lack of a slurry liquid level and density detection device suitable for the flotation tank and a liquid level detection method. SUMMARY

[0006] In order to achieve the above purpose, the embodiments of the present application provide a slurry liquid level and density detection device, which comprises:

[0007] The detection pipe group comprises an overflow pipe arranged in a first direction, a first gas guide pipe and a second gas guide pipe arranged in a second direction, both ends of the overflow pipe are closed, and an overflow hole is arranged on the overflow pipe;

[0008] The first end of the first air duct and the second air duct is closed, and the second end is open. Ventilation holes are arranged on the side walls of the first air duct and the second air duct. The first air duct and the second air duct are arranged in parallel in the overflow pipe, and the second ends of the first air duct and the second air duct are located on the same side of the overflow pipe. The first air duct and the second air duct are in communication with the overflow pipe through the ventilation holes.

[0009] An air inlet unit is arranged for connecting the second end of the first air duct.

[0010] A pressure detection unit is arranged for detecting the exhaust pressure of the second end of the second air duct.

[0011] The detection pipe groups are arranged in n groups, and n is a positive integer not less than 3. The overflow holes in the n groups of detection pipe groups are located at different heights in the second direction.

[0012] Preferably, the upper ends and the lower ends of the n groups of detection pipe groups are aligned respectively.

[0013] The overflow holes are arranged on the hole arrangement planes, and the hole arrangement planes are perpendicular to the second direction. The hole arrangement planes of the n groups of detection pipe groups are located at different heights in the second direction.

[0014] One or more overflow holes are arranged on each hole arrangement plane.

[0015] Preferably, the ore pulp liquid level and density detection device further comprises an upper chuck and a lower chuck. The upper chuck is fixedly connected with the upper ends of the first air duct and the second air duct of the n groups of detection pipe groups. The lower chuck is fixedly connected with the lower ends of the first air duct and the second air duct of the n groups of detection pipe groups. The upper chuck and the lower chuck are used for aligning the n groups of detection pipe groups.

[0016] Preferably, the ore pulp liquid level and density detection device further comprises an upper computer and a filter. The filter is used for receiving the exhaust pressure signals obtained by the pressure detection units of the n groups of detection pipe groups.

[0017] The upper computer is in signal connection with the filter. The upper computer is used for receiving the exhaust pressure signals filtered by the filter.

[0018] Preferably, the number of detection pipe groups is 4.

[0019] Based on the same inventive concept, the application further provides a liquid level detection method. The ore pulp liquid level and density detection device is used, and the method comprises the following steps:

[0020] S10. The n groups of detection pipe groups are vertically immersed in the ore pulp, and the lowest overflow hole is located at a height L from the bottom of the flotation tank.

[0021] S20. A constant pressure gas is introduced into the first air guide pipe of the n groups of detection pipe groups, and the pressure value of the constant pressure gas is greater than the liquid pressure at the lowest overflow hole;

[0022] S30. The exhaust pressure of the second air guide pipe in the n groups of detection pipe groups is obtained, and the average density and the liquid level of the ore pulp are calculated based on the exhaust pressure;

[0023] Preferably, in step S30, the following is included:

[0024] S31. The exhaust pressure corresponding to the overflow hole in the height direction is obtained, the exhaust pressure difference between adjacent overflow holes is calculated, and the density of the ore pulp between adjacent overflow holes is calculated based on the exhaust pressure difference; n-1 ore pulp densities are obtained.

[0025] S32. The average density is calculated based on the obtained ore pulp densities;

[0026] S33. The height of the highest overflow hole from the liquid level of the ore pulp is calculated based on the average density of the ore pulp, and the liquid level of the ore pulp is obtained.

[0027] Preferably, in step S31, the relationship between the ore pulp density and the exhaust pressure difference is:

[0028] ΔP = ρgΔh

[0029] In the formula, ΔP is the exhaust pressure difference between adjacent overflow holes, ρ is the ore pulp density between adjacent overflow holes corresponding to ΔP, Δh is the vertical distance between adjacent overflow holes, and g is a constant.

[0030] Preferably, in step S32, the relationship between the average density and the ore pulp density is:

[0031]

[0032] In the formula, ρ 平 is the average density, ρ n-1 is the ore pulp density between adjacent overflow holes, and n is the number of detection pipe groups.

[0033] Preferably, in step S33, the relationship between the average density of the ore pulp and the liquid level of the ore pulp satisfies:

[0034]

[0035] In the formula, H is the height of the liquid level of the ore pulp, L is the height of the lowest overflow hole from the bottom of the flotation tank, Δh n-1 is the vertical distance between adjacent overflow holes, P1 is the exhaust pressure of the highest overflow hole, g is a constant, and ρ 平 is the average density of the ore pulp.

[0036] The above scheme of the present application has the following advantages:

[0037] The application characterizes the liquid pressure by air pressure, designs the liquid level and density detection device by differential pressure method, can effectively avoid the corrosion of the sensor of the ore pulp, reduces the interference of the stirring and bubbles in the flotation tank, and can accurately obtain the liquid level and density of the ore pulp.

[0038] Other features and advantages of the present application will be described in detail in the following specific embodiment part. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is a schematic diagram of four detection tube groups

[0040] Figure 2 is Figure 1 a top view of

[0041] Figure 3 is a sectional view of any detection tube group

[0042] Figure 4 is Figure 3 an enlarged view of part A in

[0043] REFERENCE SIGNS

[0044] 11-first air guide pipe, 12-second air guide pipe, 13-overflow pipe, 14-vent hole, 15-overflow hole,

[0045] 2-upper chuck,

[0046] 3-lower chuck. DETAILED DESCRIPTION

[0047] In order to make the technical problems, technical solutions and advantages to be solved by the present application more clear, the following will be described in detail in combination with the drawings and specific embodiments.

[0048] As Figures 1-4 shown, the embodiment of the present application provides an ore pulp liquid level and density detection device, which comprises a detection tube group, the detection tube group comprises an overflow pipe 13, a first air guide pipe 11 and a second air guide pipe 12, wherein the length of the overflow pipe 13 is arranged along a first direction, and the lengths of the first air guide pipe 11 and the second air guide pipe 12 are both arranged along a second direction. Both ends of the aforementioned overflow pipe 13 are closed, and an overflow hole 15 is arranged on the overflow pipe 13.

[0049] The first end of each of the first air guide pipe 11 and the second air guide pipe 12 is closed, and the second end is open, and an air vent hole 14 is further arranged on the side wall of the first air guide pipe 11 and the second air guide pipe 12 respectively, the first air guide pipe 11 and the second air guide pipe 12 are radially arranged on the overflow pipe 13 in parallel, and the second end of the first air guide pipe 11 and the second air guide pipe 12 is located on the same side of the overflow pipe 13, and the first air guide pipe 11 and the second air guide pipe 12 are communicated with the overflow pipe 13 through the air vent hole 14.

[0050] The detection pipe group is provided with n groups, where n is a positive integer not less than 3, and the overflow holes 15 in the n groups of detection pipe groups are located at different heights in the second direction.

[0051] The ore pulp liquid level and density detection device further comprises an air inlet unit and a pressure detection unit, the air inlet unit is used for connecting the second end of the first air guide pipe 11 of each detection pipe group, the air inlet unit is used for filling the first air guide pipe 11 with constant pressure gas, and the pressure detection unit is used for detecting the exhaust pressure of the second end of the second air guide pipe 12 of each detection pipe group.

[0052] The working principle of the present application is as follows: when the device is placed in the ore pulp, constant pressure gas is input, the pressure of the constant pressure gas is greater than the liquid pressure at the position of the lowest overflow hole 15, and part of the gas will flow out from each overflow hole 15 under the action of the constant pressure gas, and after stabilization, no gas will continue to flow out from the overflow hole 15. At this time, the pressure detection unit obtains the exhaust pressure of the second air guide pipe 12, which is equal to the pressure of the ore pulp at the overflow hole 15. Based on this principle, the ore pulp density at different heights can be obtained through n detection pipe groups and the pressure detection unit corresponding to the detection pipe group, the average density can be obtained from the ore pulp density, and the height of the ore pulp liquid level can be known through the average density.

[0053] The present application obtains the average density of the ore pulp by the way of gas pressure representing hydraulic pressure, compared with the existing density determination method, the device has high detection accuracy and does not harm the surrounding environment, and can be widely applied in the flotation process. The average density detection and liquid level detection are integrated in one device by using the differential pressure method, reducing the number of devices. Compared with the commonly used two-point differential pressure method, the present application can increase the number of overflow pipes 13 according to needs, increase the detection points, and is conducive to improving the accuracy of the results.

[0054] Further, the upper end and the lower end of the n groups of detection pipe groups are aligned respectively, and the overflow holes 15 in the n groups of detection pipe groups are arranged on the hole arrangement plane, the hole arrangement plane is perpendicular to the second direction, and each hole arrangement plane of the n groups of detection pipe groups is located at a different height in the second direction. One or more overflow holes 15 are arranged on the hole arrangement plane.

[0055] When the overflow hole 15 is provided with one, the overflow hole 15 can be arranged on the side wall or both ends of the overflow pipe 13. When the overflow hole 15 is provided with one, the basic purpose of the present application can be achieved.

[0056] When the overflow hole 15 is provided with multiple, the gas exhaust speed in the overflow pipe 13 can be accelerated, and the detection efficiency and accuracy can be improved. When the overflow hole 15 is provided with multiple, the overflow hole 15 can be arranged on the side wall and / or both ends of the overflow pipe 13, and it should be noted that when multiple overflow holes 15 are arranged, the multiple overflow holes 15 need to be located on the hole arrangement plane corresponding to the overflow pipe 13 to ensure that the liquid pressures of the multiple overflow holes 15 are equal.

[0057] Further, the slurry liquid level and density detection device further comprises an upper chuck 2 and a lower chuck 3, the upper chuck 2 is fixed with the upper ends of the first gas guide pipe 11 and the second gas guide pipe 12 of the n groups of detection pipe groups, and the lower chuck 3 is fixed with the lower ends of the first gas guide pipe 11 and the second gas guide pipe 12 of the n groups of detection pipe groups, and the upper chuck 2 and the lower chuck 3 are used to align the n groups of detection pipe groups.

[0058] Further, the slurry liquid level and density detection device further comprises a host computer and a filter, the filter is signal connected with the n pressure detection units, the filter obtains the exhaust pressure signals obtained by the n pressure detection units, and filters the exhaust pressure signals to reduce the discreteness of the data. Preferably, after filtering the exhaust pressure signals, the average of the retained exhaust pressure signals is taken as the liquid pressure at the hole arrangement plane. The host computer is signal connected with the filter, the host computer receives the exhaust pressure signals filtered by the filter, and processes the exhaust pressure signals in the host computer to calculate the average density and the slurry liquid level of the slurry.

[0059] Preferably, the number of detection pipe groups in the present application is 4, and in the present application, the number of detection pipe groups is positively correlated with the detection accuracy. By setting the number of detection pipe groups to 4, the accuracy of the obtained average density and liquid level height can be ensured, and the calculation pressure of the host computer can be reduced.

[0060] The present application also provides a detection method, which adopts the aforementioned slurry liquid level and density detection device, and comprises the following steps:

[0061] S10. Vertically immerse the n groups of detection pipe groups in the slurry, and the lowest overflow hole 15 is L high from the bottom of the flotation tank.

[0062] In this step, the detection pipe groups are vertically immersed in the slurry, the second end of the first gas guide pipe is kept above the slurry liquid surface, and the overflow hole 15 on each overflow pipe 13 is immersed in the slurry. At this time, the second direction of the slurry liquid level and density detection device is the vertical direction, and the first direction of the slurry liquid level and density detection device is the horizontal direction. At the same time, the height L is a preset value.

[0063] S20. A constant pressure gas is introduced into the first gas guide pipe 11 of the n groups of detection pipe groups, and the pressure of the constant pressure gas is greater than the liquid pressure at the lowest overflow hole 15.

[0064] In this step, the purpose of introducing the constant pressure gas is to discharge the gas from the overflow hole 15 to the ore pulp, and when the gas pressure at the overflow hole 15 and the liquid pressure of the ore pulp reach equilibrium, the gas is no longer discharged outward through the overflow hole 15.

[0065] S30. The exhaust pressure of the second gas guide pipe 12 in the n groups of detection pipe groups is obtained, and the average density and the liquid level of the ore pulp are calculated based on the exhaust pressure.

[0066] In this step, the following sub-steps are included:

[0067] S31. The exhaust pressure of each overflow hole 15 in the vertical height direction is obtained, and the exhaust pressure difference between adjacent overflow holes 15 is calculated, and the ore pulp density between adjacent overflow holes 15 is calculated based on the exhaust pressure difference, and n-1 ore pulp densities are obtained in total.

[0068] In this step, the exhaust pressure corresponding to each overflow hole 15 is obtained when the exhaust pressure obtained by each pressure detection unit tends to be stable, and the data of the exhaust pressure is filtered to reduce the dispersion, and the exhaust pressure difference between adjacent overflow holes 15 is calculated after filtering. It can be understood that when multiple overflow holes 15 are arranged in each overflow pipe 13, it can be understood that the exhaust pressure difference between adjacent overflow hole planes is calculated.

[0069] The relationship between the ore pulp density and the exhaust pressure difference is:

[0070] ΔP = ρgΔh

[0071] In the formula, ΔP is the exhaust pressure difference between adjacent overflow holes 15, ρ is the ore pulp density between adjacent overflow holes 15 corresponding to ΔP, Δh is the height distance between adjacent overflow holes 15, and g is a constant.

[0072] Through the relationship between the ore pulp density and the exhaust pressure difference, the ore pulp density ρ between any adjacent overflow holes 15 can be obtained.

[0073] S32. The average density of the ore pulp is calculated based on the ore pulp density ρ obtained in the foregoing.

[0074] The relationship between the ore pulp density and the average density of the ore pulp is:

[0075]

[0076] In the formula, ρ 平 is the average density, and ρ n-1The height of the highest overflow hole 15 from the pulp level is calculated based on the average density obtained in the relationship between the pulp density and the average density of the pulp in step S33, and the height of the pulp level is further obtained.

[0077] Further, in step S33, the height of the highest overflow hole 15 from the pulp level is calculated based on the average density obtained in the relationship between the pulp density and the average density of the pulp, and the height of the pulp level is further obtained.

[0078] In step S33, the height of the highest overflow hole 15 from the pulp level is calculated based on the average density, and the relationship between the average density and the height of the pulp level satisfies:

[0079]

[0080] In the formula, H is the height of the pulp level, L is the height of the lowest overflow hole 15 from the bottom of the flotation tank, Δh n-1 is the height distance of adjacent overflow holes 15, P1 is the exhaust pressure of the highest overflow hole 15, and g is a constant.

[0081] To simplify the relationship between the pulp and the height of the pulp level, the intervals of adjacent hole planes in the vertical direction are the same when arranging the hole planes, that is, Δh1= Δh2= … = Δh n-1 .

[0082] The aforementioned average density and the height of the pulp level can be displayed by the host computer.

[0083] The detection method provided in the present application uses air pressure to represent hydraulic pressure, and the obtained liquid pressure data is not affected by external temperature and the size of the input gas, reducing the influence of stirring and bubbles in the flotation tank and having good anti-interference performance. At the same time, the average density detection and the liquid level detection are integrated in one device by using the differential pressure method, and the liquid pressure is indirectly detected by using the gas pressure, the sensor is isolated from the pulp, and the corrosion of the sensor by the acidic pulp is avoided.

[0084] The above describes the preferred embodiments of the present application, and it should be noted that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A liquid level detection method, characterized in that: The slurry level and density detection device is used for detection, and the slurry level and density detection device includes: A detection tube group, comprising an overflow tube (13) arranged along a first direction, a first air guide tube (11) and a second air guide tube (12) arranged along a second direction, wherein both ends of the overflow tube (13) are closed, and an overflow hole (15) is provided on the overflow tube (13); The first ends of the first air guide tube (11) and the second air guide tube (12) are closed, and the second ends are open. A vent hole (14) is further provided on the side walls of the first air guide tube (11) and the second air guide tube (12). The first air guide tube (11) and the second air guide tube (12) are parallel to and penetrate the overflow tube (13). The second ends of the first air guide tube (11) and the second air guide tube (12) are located on the same side of the overflow tube (13). The first air guide tube (11) and the second air guide tube (12) are respectively connected to the overflow tube (13) through the vent hole (14). An air intake unit, used for connecting to the second end of the first air guide pipe (11); a pressure detection unit, used for detecting the exhaust pressure at the second end of the second air duct (12); The detection tube groups are provided in n groups, where n is a positive integer not less than 3, and the overflow holes (15) in the n groups of detection tube groups are located at different heights in the second direction; The upper ends and lower ends of the n groups of detection tubes are aligned respectively; The overflow holes (15) are arranged on a hole layout plane, the hole layout plane is perpendicular to the second direction, and the hole layout planes of the n groups of detection tubes are located at different heights in the second direction; One or more overflow holes (15) are provided on each hole distribution plane; The liquid level detection method includes the following steps: S10. Vertically immerse n sets of detection tubes in the slurry, with the lowest overflow hole (15) at a height L from the bottom of the flotation tank; S20. A constant pressure gas is introduced into the first gas guide tube (11) of the n groups of detection tubes, wherein the pressure of the constant pressure gas is greater than the liquid pressure at the lowest overflow hole (15); S30. Obtaining the exhaust pressure of the second air guide pipe (12) in the n detection tube groups, and calculating the average density and liquid level of the slurry based on the exhaust pressure; Step S30 includes: S31. Obtaining the exhaust pressure corresponding to the overflow hole (15) in the height direction, calculating the exhaust pressure difference between adjacent overflow holes (15), and calculating the density of the slurry between adjacent layers of overflow holes (15) based on the exhaust pressure difference; obtaining n-1 slurry densities; S32. Calculate the average density based on the obtained slurry density; S33. Calculate the height of the highest overflow hole (15) from the slurry surface based on the average density of the slurry, and then obtain the slurry surface height.

2. The liquid level detection method according to claim 1, wherein: The slurry level and density detection device further comprises an upper chuck (2) and a lower chuck (3), wherein the upper chuck (2) is fixedly connected to the upper ends of the first air guide tube (11) and the second air guide tube (12) of the n groups of detection tubes, and the lower chuck (3) is fixedly connected to the lower ends of the first air guide tube (11) and the second air guide tube (12) of the n groups of detection tubes, and the upper chuck (2) and the lower chuck (3) are used to align the n groups of detection tubes.

3. The liquid level detection method according to claim 2, wherein: The slurry level and density detection device further includes a host computer and a filter, wherein the filter is used to receive the exhaust pressure signal obtained by the pressure detection unit of the n groups of detection tubes; The host computer is connected to the filter signal, and the host computer is used to receive the exhaust pressure signal after being filtered by the filter.

4. The liquid level detection method according to claim 1, wherein: The number of detection tube sets is 4.

5. The liquid level detection method according to claim 1, wherein: In step S31, the relationship between slurry density and exhaust pressure difference is: ； Where, is the exhaust pressure difference between adjacent overflow holes (15), and ρ is The slurry density between the corresponding adjacent overflow holes (15) is is the vertical distance between adjacent overflow holes (15), and g is a constant.

6. The liquid level detection method according to claim 1, wherein: In step S32, the relationship between the average density and the pulp density is: ； Where, is the average density, is the slurry density between adjacent overflow holes (15), and n is the number of detection tube groups.

7. The liquid level detection method according to claim 1, wherein: In step S33, the relationship between the average density of the slurry and the height of the slurry liquid level satisfies: ； Where H is the height of the slurry surface, L is the height from the lowest overflow hole (15) to the bottom of the flotation tank, is the vertical distance between adjacent overflow holes (15), is the exhaust pressure of the highest overflow hole (15), is a constant, is the average density of the slurry.

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