Coal slime filtering performance detection device and coal slime filtering performance detection method

Abstract

The invention relates to the technical field of coal slime detection, in particular to a coal slime filtering performance detection device and a coal slime filtering performance detection method.The coal slime filtering performance detection device comprises a filtering assembly, a collecting cup, a weighing device and a processor, the filtering assembly comprises a filtering tank and a filtering piece, and a containing cavity is formed in the filtering tank; a first opening penetrating to the containing cavity is formed in the bottom face of the filtering tank, the filtering piece is arranged at the first opening and used for supporting coal slime in the containing cavity and filtering filtrate downwards, the collecting cup is arranged on the top face of the weighing device and located below the filtering tank, the processor is connected to the weighing device, and the weighing device is used for detecting the mass of the filtrate in the collecting cup; the quality result is transmitted to a processor, and the processor obtains a first derivative and a second derivative of the quality result with respect to time. In conclusion, the coal slime filtering performance detection device and the coal slime filtering performance detection method can obtain the characteristics of the coal slime water so as to improve the filtering efficiency and effect of the coal slime water.

Description

Technical Field

[0001] The present invention relates to the technical field of slime detection, and particularly to a slime filtration performance detection device and a slime filtration performance detection method. Background Art

[0002] Currently, in the slime filtration operation, plate and frame filter presses and pressure filters are commonly used key equipment, and their operating efficiency is mainly affected by two core factors: one is the working parameters of the equipment itself, and the other is the filtration characteristics of slime water. At present, for the working parameters of plate and frame filter presses and pressure filters themselves, relatively perfect quantitative analysis has been achieved in the industry, which can be flexibly adjusted according to the actual production situation, and rich practical experience has been accumulated. For example, for plate and frame filter presses, parameters such as feed concentration, feed particle size, feed pressure, pressure holding time, backwashing time, squeezing pressure, squeezing time, and filter cloth mesh size have been deeply studied; for pressure filters, parameters such as feed concentration, feed particle size, filtration pressure, main shaft speed, backwashing pressure, filter cloth mesh size, upper filtrate pipe opening, and lower filtrate pipe opening have also received sufficient attention.

[0003] However, for the filtration characteristics of slime water, the current industry lacks corresponding evaluation and detection means. The factors affecting the filtration performance of slime water itself are relatively complex, mainly including feed concentration, particle size composition, flocculation effect, viscosity, slime mineral composition, etc. Although there are many influencing factors, the filtration performance of slime water is ultimately mainly reflected by filtration time and filter cake moisture. Due to the lack of effective evaluation and detection means, it is difficult to effectively match the filtration characteristics of slime water with the equipment working parameters, thereby restricting the further improvement of the equipment process performance.

[0004] Existing research on filtration performance mostly focuses on parameters related to equipment, and no evaluation method and index specifically for the filtration characteristics of slime water itself have been formed. In the actual production process, only the working parameters of the equipment can be mainly adjusted, and different equipment working parameters cannot be matched according to slime water with different filtration performances. This leads to the selection of equipment and parameter matching relying heavily on experience, and inevitably there are situations where the equipment selection or parameter adjustment is unreasonable, thereby affecting the efficiency and effect of slime filtration. Summary of the Invention

[0005] The purpose of the present invention is to provide a slime filtration performance detection device and a slime filtration performance detection method to solve the technical problem that the filtration characteristics of slime water cannot be confirmed, resulting in the inability of filtration equipment to be adjusted according to the filtration characteristics of slime water, thereby affecting the efficiency and effect of slime water filtration.

[0006] To achieve the above object, the present invention provides a device for detecting the filtration performance of slime, which includes a filtration component, a collection cup, a weighing device, and a processor. The filtration component includes a filtration tank and a filtration element. An accommodation cavity is provided in the filtration tank. A first opening penetrating to the accommodation cavity is provided at the bottom surface of the filtration tank. The filtration element is disposed at the first opening and is used to support the slime in the accommodation cavity and filter out the filtrate downward. The collection cup is disposed on the top surface of the weighing device and is located below the filtration tank. The processor is connected to the weighing device. The weighing device is used to detect the mass of the filtrate in the collection cup and transmit the mass result to the processor. The processor calculates the first derivative and the second derivative of the mass result with respect to time.

[0007] Optionally, the filtration component further includes a filter paper and a first sealing ring. A first connecting portion is provided at an outer sidewall of the filtration tank at an interval from its bottom end. The filtration element includes a filter plate and a first surrounding wall. The first surrounding wall is disposed on the top surface of the filter plate along the edge of the filter plate. The filter plate covers the bottom surface of the filtration tank. The first surrounding wall surrounds the filtration tank and is connected to the first connecting portion. The filter paper is disposed between the filter plate and the filtration tank and protrudes from the outer sidewall of the filtration tank. The top surface of the filter paper, the outer sidewall of the filtration tank, the bottom surface of the first connecting portion, and the inner side surface of the first surrounding wall enclose a first sealing gap. The first sealing ring is disposed in the first sealing gap to seal the gap between the filtration tank and the filtration element. The filter plate is provided with a plurality of water permeable holes corresponding to the first opening, and the water permeable holes penetrate the filter plate in the up and down direction.

[0008] Optionally, it further includes a pressure component. An air inlet penetrating to its accommodation cavity is provided on an outer surface of the filtration tank. The pressure component includes a pressure gauge, an air tank, an air compressor, a pressure reducing valve, and a control valve. The air compressor is connected to the air tank. The air tank is connected to the air inlet. The pressure reducing valve and the control valve are disposed between the air tank and the air inlet. The pressure gauge is connected to the filtration tank to detect the pressure in the accommodation cavity.

[0009] Optionally, it further includes a closing component, which includes a covering member and a second sealing ring. The top surface of the filtering tank is provided with a second opening penetrating through to the accommodating cavity. A second connecting portion is provided on the outer sidewall of the filtering tank at an interval from its top end. The covering member includes a covering plate and a second surrounding wall. The second surrounding wall is arranged on the bottom surface of the covering plate along the edge of the covering plate. The covering plate is covered on the top surface of the filtering tank. The second surrounding wall surrounds the filtering tank and is connected to the second connecting portion. A second sealing gap is formed by the bottom surface of the covering plate, the outer sidewall of the filtering tank, the top surface of the second connecting portion, and the inner side surface of the second surrounding wall. The second sealing ring is arranged in the second sealing gap to seal the gap between the filtering tank and the covering member.

[0010] Optionally, it further includes a stirring component, which includes a cable, a sealing layer, a motor bracket, a stirring rod, and a stirring motor. The motor bracket, the stirring rod, and the stirring motor are located in the accommodating cavity. The motor bracket is fixedly connected to the bottom surface of the covering plate. The stirring motor is fixedly connected to the motor bracket. The stirring rod is vertically arranged and connected to the stirring motor. The stirring motor is used to drive the stirring rod to rotate. The covering plate is provided with a wire hole penetrating in the up-and-down direction. The wire hole is arranged corresponding to the second opening. The cable passes through the wire hole and is connected to the stirring motor. The sealing layer is arranged between the cable and the wire hole to seal the gap between the cable and the wire hole.

[0011] Optionally, it further includes a platform and a fixing bracket. The fixing bracket and the weighing device are arranged on the top surface of the platform. The fixing bracket includes a fixing base, a bracket vertical rod, and a bracket cross rod connected in sequence. The fixing base is arranged on the top surface of the platform. The bracket vertical rod is arranged on the top surface of the fixing base. The bracket cross rod is arranged on the outer side surface of the bracket vertical rod. The bracket cross rod is higher than the collection cup. The bracket cross rod is provided with a through hole penetrating in the up-and-down direction. The outer sidewall of the filtering tank is provided with a third connecting portion. The filtering tank passes through the through hole. The bottom surface of the third connecting portion abuts against the top surface of the bracket cross rod so that the filtering tank is fixedly connected to the bracket cross rod.

[0012] The present invention also relates to a method for detecting the filtration performance of slime, including the following steps:

[0013] S1. Pour the slime water into the accommodating cavity of the stirring tank;

[0014] S2. Zero the mass result detected by the weighing device;

[0015] S3. The weighing device transmits the mass result to the processor every fixed period of time. The processor subtracts the previous mass result from the current mass result to obtain the mass change of the filtrate. The processor subtracts the previous mass change of the filtrate from the current mass change of the filtrate to obtain the change of the current mass change of the filtrate.

[0016] S4. When both the mass change of the filtrate and the change of the mass change of the filtrate are zero, stop the detection.

[0017] Optionally, the following steps are further included:

[0018] Between step S1 and step S2, stir the slime water in the accommodating cavity.

[0019] Optionally, the following steps are further included:

[0020] Before step S2, increase the pressure in the accommodating cavity so that the pressure in the accommodating cavity is greater than the atmospheric pressure.

[0021] Optionally, use the aforementioned slime filtration performance detection device for detection.

[0022] Compared with the prior art, the beneficial effects of a slime filtration performance detection device and a slime filtration performance detection method implemented by the present invention are as follows:

[0023] In the coal slime filtration performance detection device of the present invention, the accommodation cavity in the filtration tank is used to load coal slime water. The filter element is arranged at the first opening to support the coal slime water in the accommodation cavity, and filter out the coal slime when the water in the coal slime water passes through the first opening and the filter element, leaving the coal slime powder in the accommodation cavity. Further, the weighing device real-time detects the mass of the filtrate in the collection cup and transmits the mass result to the processor. The processor takes the first derivative and the second derivative of the mass result with respect to time. Further, after the filtration starts, as time passes, the filtrate continuously drips into the collection cup, and three values can be obtained: the mass detected by the weighing device, the first derivative obtained, and the second derivative obtained. Among them, the mass detected by the weighing device continuously increases and finally stabilizes at a fixed value; the first derivative obtained first approaches a smaller constant from a larger positive number, then maintains at the smaller constant, and finally accelerates towards 0 and finally becomes 0; the second derivative obtained first approaches 0 from a larger negative number. At this time, the coal slime water is in the sedimentation stage, then maintains at the 0 value for a period of time. At this time, the coal slime water is in the filtration stage, then suddenly becomes negative, and then approaches 0. At this time, the coal slime water is in the dehydration stage, and finally becomes 0. When both the first derivative obtained and the second derivative obtained are 0, the filtration is completed and the detection stops. Among them, the time when the second derivative obtained approaches 0 from a larger negative number is the sedimentation characteristic cj of the coal slime water, the time when the second derivative obtained maintains at 0 is the filtration characteristic gl, and the time when the second derivative obtained suddenly becomes negative, then approaches 0, and finally becomes 0 is the dehydration characteristic ts. The filtration performance MNSGL is the sum of the sedimentation characteristic cj, the filtration characteristic gl, and the dehydration characteristic ts. In summary, the coal slime filtration performance detection device and the coal slime filtration performance detection method of the present invention can obtain the sedimentation characteristic cj, the filtration characteristic gl, the dehydration characteristic ts, and the filtration performance MNSGL of the coal slime water, so as to facilitate the guidance of the filtration production of the coal slime water, and further improve the efficiency and effect of the coal slime water filtration. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of the coal slime filtration performance detection device of the present invention.

[0025] Figure 2 It is a schematic structural diagram of the filtration component and the stirring component of the present invention.

[0026] Figure 3 It is a flowchart of the coal slime filtration performance detection method of the present invention.

[0027] Figure 4 It is a curve diagram of the mass of the filtrate and the change of the mass of the filtrate in one of the detection results.

[0028] Figure 5 It is a curve diagram of the change of the mass of the filtrate and the change of the change of the mass of the filtrate in one of the detection results.

[0029] Reference numerals: 1, filtering component; 11, filtering tank; 12, filtering element; 121, filtering plate; 122, first surrounding wall; 13, filter paper; 14, first sealing ring; 2, collecting cup; 21, first connecting portion; 22, second connecting portion; 23, third connecting portion; 24, air inlet; 3, weighing device; 4, processor; 5, pressure component; 51, pressure gauge; 52, air compressor; 53, pressure reducing valve; 54, control valve; 55, gas tank; 6, closing component; 61, covering member; 611, covering plate; 612, second surrounding wall; 62, second sealing ring; 7, stirring component; 71, cable; 72, motor bracket; 73, stirring rod; 74, stirring motor; 75, sealing layer; 8, platform; 9, fixing bracket; 91, fixing base; 92, vertical bracket rod; 93, horizontal bracket rod; 10, controller. Detailed implementation manners

[0030] The following combines the drawings and embodiments to further describe in detail the specific implementation manners of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0031] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by terms such as "top", "bottom", "inside", "outside", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0032] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] Such as Figure 1 And 2As shown in the figure, a slime filtration performance detection device of the present invention includes a filtration component 1, a collection cup 2, a weighing device 3, and a processor 4. The filtration component 1 includes a filtration tank 11 and a filtration element 12. An accommodation cavity is provided inside the filtration tank 11. A first opening penetrating through to the accommodation cavity is provided at the bottom surface of the filtration tank 11. The filtration element 12 is arranged at the first opening. The filtration element 12 is used to support the slime in the accommodation cavity and filter out the filtrate downward. The collection cup 2 is arranged on the top surface of the weighing device 3 and is located below the filtration tank 11. The processor 4 is connected to the weighing device 3. The weighing device 3 is used to detect the mass of the filtrate in the collection cup 2 and transmit the mass result to the processor 4. The processor 4 calculates the first derivative and the second derivative of the mass result with respect to time.

[0034] In the above technical solution, the accommodation cavity inside the filtration tank 11 is used to load slime water. The filtration element 12 is arranged at the first opening to support the slime water in the accommodation cavity and filter out the slime when the water in the slime water passes through the first opening and the filtration element 12, so that the slime powder remains in the accommodation cavity. Further, the weighing device 3 detects the mass of the filtrate in the collection cup 2 in real time and transmits the mass result to the processor 4. The processor 4 calculates the first derivative and the second derivative of the mass result with respect to time. Further, after the filtration starts, as time passes, the filtrate continuously drips into the collection cup 2. It can be obtained that there are three values: the mass detected by the weighing device 3, the calculated first derivative, and the calculated second derivative. Among them, the mass detected by the weighing device 3 continuously increases and finally remains at a fixed value; the calculated first derivative first approaches a smaller constant from a larger positive number, then remains at the smaller constant, and finally accelerates towards 0 and finally becomes 0; the calculated second derivative first approaches 0 from a larger negative number. At this time, the slime water is in the sedimentation stage, then remains at the 0 value for a period of time. At this time, the slime water is in the filtration stage, then suddenly becomes negative, and then approaches 0. At this time, the slime water is in the dehydration stage, and finally becomes 0. When both the calculated first derivative and the calculated second derivative are 0, the filtration is completed and the detection is stopped. Among them, the time when the calculated second derivative approaches 0 from a larger negative number is the sedimentation characteristic cj of the slime water, the time when the calculated second derivative remains at 0 is the filtration characteristic gl, the time when the calculated second derivative suddenly becomes negative, then approaches 0, and finally becomes 0 is the dehydration characteristic ts. The filtration performance MNSGL is the sum of the sedimentation characteristic cj, the filtration characteristic gl, and the dehydration characteristic ts. In summary, the slime filtration performance detection device and the slime filtration performance detection method of the present invention can obtain the sedimentation characteristic cj, the filtration characteristic gl, the dehydration characteristic ts, and the filtration performance MNSGL of the slime water, so as to facilitate the guidance of the filtration production of the slime water, and further improve the efficiency and effect of the slime water filtration.

[0035] Among them, when the sedimentation characteristic cj is relatively large, the usage amounts of the flocculant and the coagulant can be increased, and the specific increased amounts are determined through on-site tests until the sedimentation characteristic cj is within the normal range, and vice versa; when the filtration characteristic gl is relatively large, it indicates that the feeding effect is poor. At this time, the rotation speed of the filter discs of the pressure filter is reduced to extend the soaking time of the filter discs in the slime water, improve the cake formation situation, and thus increase the throughput, or extend the feeding time of the plate and frame filter press to ensure that the total amount of final dry slime meets the standard and increase the throughput. Otherwise, reverse adjustment is carried out to improve the working efficiency of the equipment, that is, the working cycle, so as to increase the total slime treatment capacity; when the dewatering characteristic ts is relatively large, it indicates that the filtration performance is poor, and the filtration time needs to be extended, that is, the pressing time of the plate and frame filter press is extended, so as to ensure the dewatering effect, and the upper filtrate valve of the pressure filter is reduced to ensure the moisture content while reducing the gas consumption.

[0036] In addition, the collection cup 2 can be an open cup, such as a measuring cup and a beaker.

[0037] Furthermore, the filter assembly 1 further includes a filter paper 13 and a first sealing ring 14. A first connecting portion 21 is provided on the outer side wall of the filter tank 11 at an interval from its bottom end. The filter element 12 includes a filter plate 121 and a first surrounding wall 122. The first surrounding wall 122 is arranged on the top surface of the filter plate 121 along the edge of the filter plate 121. The filter plate 121 covers the bottom surface of the filter tank 11. The first surrounding wall 122 surrounds the filter tank 11 and is connected to the first connecting portion 21. The filter paper 13 is arranged between the filter plate 121 and the filter tank 11 and protrudes from the outer side wall of the filter tank 11. The top surface of the filter paper 13, the outer side wall of the filter tank 11, the bottom surface of the first connecting portion 21, and the inner side surface of the first surrounding wall 122 enclose a first sealing gap. The first sealing ring 14 is arranged in the first sealing gap to seal the gap between the filter tank 11 and the filter element 12. The filter plate 121 is provided with a plurality of water permeable holes corresponding to the first opening, and the water permeable holes penetrate through the filter plate 121 in the up and down direction.

[0038] Among them, water sequentially passes through the filter paper 13 and the water permeable holes and then drips into the collection cup 2 to ensure the filtration effect through double-layer filtration; the first sealing ring 14 can abut against the top surface of the filter paper 13, the outer side wall of the filter tank 11, the bottom surface of the first connecting portion 21, and the inner side surface of the first surrounding wall 122 to ensure the sealing effect. In addition, the first surrounding wall 122 can be threadedly connected to the first connecting portion 21.

[0039] Further, it further includes a pressure assembly 5. An air inlet 24 penetrating through to its accommodation cavity is provided on the outer surface of the filter tank 11. The pressure assembly 5 includes a pressure gauge 51, an air tank 55, an air compressor 52, a pressure reducing valve 53, and a control valve 54. The air compressor 52 is connected to the air tank 55, the air tank 55 is connected to the air inlet 24, the pressure reducing valve 53 and the control valve 54 are provided between the air tank 55 and the air inlet 24, and the pressure gauge 51 is connected to the filter tank 11 to detect the pressure in the accommodation cavity.

[0040] Among them, the air compressor 52 can convey gas into the accommodation cavity to increase the air pressure in the accommodation cavity, so as to accelerate the filtration speed of the coal slime water and improve the detection efficiency. The pressure reducing valve 53 can facilitate the adjustment of the air pressure in the accommodation cavity and maintain it at a set value. The control valve 54 is used to control the on-off of the gas pipeline. The pressure gauge 51 detects the pressure in the accommodation cavity to facilitate the operator to operate the pressure reducing valve 53 based on the detection result of the pressure gauge 51. Additionally, the pressure reducing valve 53 and the control valve 54 can be electronic valves.

[0041] Further, it further includes a sealing assembly 6. The sealing assembly 6 includes a covering member 61 and a second sealing ring 62. A second opening penetrating through to the accommodation cavity is provided on the top surface of the filter tank 11. A second connecting portion 22 is provided on the outer side wall of the filter tank 11 at an interval from its top end. The covering member 61 includes a covering plate 611 and a second surrounding wall 612. The second surrounding wall 612 is provided on the bottom surface of the covering plate 611 along the edge of the covering plate 611. The covering plate 611 covers the top surface of the filter tank 11. The second surrounding wall 612 surrounds the filter tank 11 and is connected to the second connecting portion 22. A second sealing gap is formed by the bottom surface of the covering plate 611, the outer side wall of the filter tank 11, the top surface of the second connecting portion 22, and the inner side surface of the second surrounding wall 612. The second sealing ring 62 is provided in the second sealing gap to seal the gap between the filter tank 11 and the covering member 61.

[0042] Among them, the operator can pour coal slime water into the accommodation cavity by opening the covering member 61. After reinstalling the covering member 61 and the second sealing ring 62, the accommodation cavity can be sealed to form a closed space, enabling the accommodation cavity to maintain a certain pressure, thereby accelerating the filtration speed. Additionally, the second surrounding wall 612 can be threadedly connected to the second connecting portion 22.

[0043] Further, it further includes a stirring assembly 7. The stirring assembly 7 includes a cable 71, a sealing layer 75, a motor bracket 72, a stirring rod 73, and a stirring motor 74. The motor bracket 72, the stirring rod 73, and the stirring motor 74 are located in the accommodating cavity. The motor bracket 72 is fixedly connected to the bottom surface of the covering plate 611. The stirring motor 74 is fixedly connected to the motor bracket 72. The stirring rod 73 is vertically arranged and connected to the stirring motor 74. The stirring motor 74 is used to drive the stirring rod 73 to rotate. The covering plate 611 is provided with a wire hole penetrating in the up and down direction. The wire hole corresponds to the second opening. The cable 71 passes through the wire hole and is connected to the stirring motor 74. The sealing layer 75 is arranged between the cable 71 and the wire hole. The sealing layer 75 is used to seal the gap between the cable 71 and the wire hole.

[0044] Among them, the stirring assembly 7 is used to accelerate dissolution, avoid affecting the filtration effect due to too high or too low local concentration, and is also used to prevent sediment aggregation, so as to prevent solid particles in the solution from aggregating too quickly to form large particle sediment. Smaller particle sediment is more likely to pass through the filter paper 13 or filter membrane during filtration, reducing the possibility of clogging the filter medium and improving the filtration efficiency. In addition, the sealing layer 75 prevents the accommodating cavity from communicating with the external air, so that the accommodating cavity becomes a closed space, enabling the accommodating cavity to maintain a certain pressure, and thus accelerating the filtration speed.

[0045] Further, it further includes a platform 8 and a fixing bracket 9. The fixing bracket 9 and the weighing device 3 are arranged on the top surface of the platform 8. The fixing bracket 9 includes a fixing base 91, a bracket vertical rod 92, and a bracket cross rod 93 connected in sequence. The fixing base 91 is arranged on the top surface of the platform 8. The bracket vertical rod 92 is arranged on the top surface of the fixing base 91. The bracket cross rod 93 is arranged on the outer side surface of the bracket vertical rod 92. The bracket cross rod 93 is higher than the collection cup 2. The bracket cross rod 93 is provided with a through hole penetrating in the up and down direction. The outer side wall of the filter tank 11 is provided with a third connecting portion 23. The filter tank 11 passes through the through hole. The bottom surface of the third connecting portion 23 abuts against the top surface of the bracket cross rod 93, so that the filter tank 11 is fixedly connected to the bracket cross rod 93.

[0046] Among them, through the platform 8 and the fixing base 91, the bracket cross rod 93 can stably support the filter tank 11, reduce its shaking during the filtration process, and thus increase the accuracy of detection.

[0047] Further, it may also include a controller 10. The controller 10 is connected to the processor 4 and the weigher 3. The weigher 3 first transmits the mass result to the controller 10, and then the controller 10 transmits the mass result to the processor 4. The controller 10 is connected to the air compressor 52, the pressure reducing valve 53, the control valve 54, the pressure gauge 51 and the stirring motor 74 to control each component to perform the detection process.

[0048] Referring to Figure 3 , this embodiment also relates to a method for detecting the filtration performance of slime, including the following steps: S1. Pour the slime water into the accommodating cavity of the stirring tank; S2. Zero the mass result detected by the weigher 3; S3. The weigher 3 transmits the mass result to the processor 4 every fixed time period. The processor 4 subtracts the previous mass result from the current mass result to obtain the mass change of the filtrate. The processor 4 subtracts the previous mass change of the filtrate from the current mass change of the filtrate to obtain the change of the current mass change of the filtrate; S4. When both the mass change of the filtrate and the change of the mass change of the filtrate are zero, stop the detection.

[0049] Among them, the mass change of the filtrate is equivalent to the first derivative of the mass result with respect to time, and the change of the mass change of the filtrate is equivalent to the second derivative of the mass result with respect to time; in addition, before pouring the slime water into the accommodating cavity of the stirring tank, dry slime and clear water can be mixed to obtain slime water. The dry slime and clear water are preferably 1:3 to adapt to the best feed concentration ratio of the plate and frame filter press and the pressure filter. The volume of the prepared slime water should exceed 5L to make the ratio more uniform. Record the total weight of the prepared slime water as M0, then pour about 1L of it into the accommodating cavity for detection, and then weigh the remaining slime water to get M1 to accurately know the mass of the poured slime water.

[0050] The following Table 1 shows the results of one detection:

[0051] Time ti mi Δmi ΔΔmi Time ti mi Δmi ΔΔmi 0 0 —— 155 608.1 15.5 0 5 60 60 —— 160 623.6 15.5 0 10 105 45 -15 165 639.1 15.5 0 15 140 35 -10 170 654.6 15.5 0 20 169 29 -6 175 670.1 15.5 0 25 193.5 24.5 -4.5 180 685.6 15.5 0 30 215 21.5 -3 185 701.1 15.5 0 35 234 19 -2.5 190 716.6 15.5 0 40 251.1 17.1 -1.9 195 732.1 15.5 0 45 267.1 16 -1.1 200 747.6 15.5 0 50 282.6 15.5 -0.5 205 761.6 14 -1.5 55 298.1 15.5 0 210 774.3 12.7 -1.3 60 313.6 15.5 0 215 785.8 11.5 -1.2 65 329.1 15.5 0 220 796.2 10.4 -1.1 70 344.6 15.5 0 225 805.3 9.1 -1.3 75 360.1 15.5 0 230 813.1 7.8 -1.3 80 375.6 15.5 0 235 819.8 6.7 -1.1 85 391.1 15.5 0 240 825.5 5.7 -1 90 406.6 15.5 0 245 830.3 4.8 -0.9 95 422.1 15.5 0 250 834.3 4 -0.8 100 437.6 15.5 0 255 837.6 3.3 -0.7 105 453.1 15.5 0 260 840.3 2.7 -0.6 110 468.6 15.5 0 265 842.4 2.1 -0.6 115 484.1 15.5 0 270 843.95 1.55 -0.55 120 499.6 15.5 0 275 845.05 1.1 -0.45 125 515.1 15.5 0 280 845.75 0.7 -0.4 130 530.6 15.5 0 285 846.05 0.3 -0.4 135 546.1 15.5 0 290 846.15 0.1 -0.2 140 561.6 15.5 0 295 846.15 0 -0.1 145 577.1 15.5 0 300 846.15 0 0 150 592.6 15.5 0

[0052] Table 1

[0053] Where ti is the time, the unit is second, mi is the mass of the filtrate, the unit is gram, Δmi is the mass change of the filtrate, and ΔΔmi is the change of the mass change of the filtrate. It can be plotted into a curve graph according to Table 1. Specifically, referring to Figure 4 and Figure 5 , among them, Figure 4 and Figure 5 the curves with the same shape in Figure 4 and Figure 5The following changes can be known: from 0s to 50s, mi increases from 0g to 267.1g, Δmi decreases from 60 to 15.5, and ΔΔmi increases from -15 to 0; from 50s to 200s, mi increases from 267.1g to 747.6g, Δmi remains at 15.5, and ΔΔmi remains at 0; from 200s to 300s, mi increases from 747.6g to 846.15g, Δmi decreases from 15.5 to 0, and ΔΔmi first decreases from 0 to -1.3 and then increases from -1.3 to 0; in summary, the sedimentation characteristic cj is 50, the filtration characteristic gl is 150, the dehydration characteristic ts is 100, and the filtration performance MNSGL is 300.

[0054] Further, the following steps are also included: between step S1 and step S2, stir the slime water in the accommodating cavity to accelerate dissolution, avoid affecting the filtration effect due to too high or too low local concentration, and prevent sediment aggregation to improve the filtration efficiency; preferably, the stirring time is 30s.

[0055] Further, the following steps are also included: before step S2, increase the pressure in the accommodating cavity to make the pressure in the accommodating cavity greater than the atmospheric pressure to accelerate the filtration speed.

[0056] Further, use the aforementioned slime filtration performance detection device for detection.

[0057] Further, fixedly setting and fixedly connecting refer to the relative position relationship of two components being fixed, including but not limited to being fixed by a connecting piece, being fixed by welding, being fixed by an adhesive, being fixed by integral molding, and being fixed by snap connection.

[0058] Further, the connecting piece includes but not limited to a fastener, a strap, a binding rope, a pneumatic connecting element, a hydraulic connecting element, a flange plate, a magic tape, and a button.

[0059] In summary, the embodiment of the present invention provides a slime filtration performance detection device and a slime filtration performance detection method, and its technical effects are:

[0060] In the coal slime filtration performance detection device of the present invention, the accommodation cavity in the filtration tank 11 is used to load coal slime water. The filter element 12 is arranged at the first opening to support the coal slime water in the accommodation cavity, and filter out the coal slime when the water in the coal slime water passes through the first opening and the filter element 12, leaving the coal slime powder in the accommodation cavity. Further, the weighing device 3 detects the mass of the filtrate in the collection cup 2 in real time and transmits the mass result to the processor 4. The processor 4 takes the first derivative and the second derivative of the mass result with respect to time. Further, after the filtration starts, as time goes by, the filtrate continuously drips into the collection cup 2. Three values can be obtained: the mass detected by the weighing device 3, the first derivative obtained, and the second derivative obtained. Among them, the mass detected by the weighing device 3 continuously increases and finally stabilizes at a fixed value; the obtained first derivative first approaches a smaller constant from a larger positive number, then maintains at the smaller constant, and finally accelerates towards 0 and finally becomes 0; the obtained second derivative first approaches 0 from a larger negative number. At this time, the coal slime water is in the sedimentation stage, then maintains at the 0 value for a period of time. At this time, the coal slime water is in the filtration stage, then suddenly becomes negative, and then approaches 0. At this time, the coal slime water is in the dehydration stage, and finally becomes 0. When both the obtained first derivative and the obtained second derivative are 0, the filtration is completed and the detection stops. Among them, the time when the obtained second derivative approaches 0 from a larger negative number is the sedimentation characteristic cj of the coal slime water, the time when the obtained second derivative maintains at 0 is the filtration characteristic gl, the time when the obtained second derivative suddenly becomes negative, then approaches 0, and finally becomes 0 is the dehydration characteristic ts, and the filtration performance MNSGL is the sum of the sedimentation characteristic cj, the filtration characteristic gl, and the dehydration characteristic ts. In summary, the coal slime filtration performance detection device and the coal slime filtration performance detection method of the present invention can obtain the sedimentation characteristic cj, the filtration characteristic gl, the dehydration characteristic ts, and the filtration performance MNSGL of the coal slime water, so as to facilitate the guidance of the filtration production of the coal slime water, and further improve the efficiency and effect of the coal slime water filtration.

[0061] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and replacements can be made, and these improvements and replacements should also be regarded as the protection scope of the present invention.

Claims

1. A device for detecting the filtration performance of slime, characterized in that, It includes a filtering component (1), a collecting cup (2), a weighing device (3) and a processor (4). The filtering component (1) includes a filtering tank (11) and a filtering element (12). An accommodation cavity is provided in the filtering tank (11). A first opening penetrating through to the accommodation cavity is provided at the bottom surface of the filtering tank (11). The filtering element (12) is arranged at the first opening. The filtering element (12) is used to support the slime in the accommodation cavity and filter out the filtrate downward. The collecting cup (2) is arranged on the top surface of the weighing device (3) and is located below the filtering tank (11). The processor (4) is connected to the weighing device (3). The weighing device (3) is used to detect the mass of the filtrate in the collecting cup (2) and transmit the mass result to the processor (4). The processor (4) calculates the first derivative and the second derivative of the mass result with respect to time.

2. The coal slime filtration performance detection device according to claim 1, wherein The filtering component (1) further includes a filter paper (13) and a first sealing ring (14). A first connecting portion (21) is provided on the outer side wall of the filtering tank (11) at an interval from its bottom end. The filtering element (12) includes a filter plate (121) and a first surrounding wall (122). The first surrounding wall (122) is arranged on the top surface of the filter plate (121) along the edge of the filter plate (121). The filter plate (121) covers the bottom surface of the filtering tank (11). The first surrounding wall (122) surrounds the filtering tank (11) and is connected to the first connecting portion (21). The filter paper (13) is arranged between the filter plate (121) and the filtering tank (11) and protrudes from the outer side wall of the filtering tank (11). A first sealing gap is formed by the top surface of the filter paper (13), the outer side wall of the filtering tank (11), the bottom surface of the first connecting portion (21) and the inner side surface of the first surrounding wall (122). The first sealing ring (14) is arranged in the first sealing gap to seal the gap between the filtering tank (11) and the filtering element (12). The filter plate (121) is provided with a plurality of water permeable holes corresponding to the first opening. The water permeable holes penetrate the filter plate (121) in the up and down direction.

3. The coal slime filtration performance detection device according to claim 1, characterized in that, It further includes a pressure component (5). An air inlet (24) penetrating through to its accommodation cavity is provided on the outer surface of the filtering tank (11). The pressure component (5) includes a pressure gauge (51), an air tank (55), an air compressor (52), a pressure reducing valve (53) and a control valve (54). The air compressor (52) is connected to the air tank (55). The air tank (55) is connected to the air inlet (24). The pressure reducing valve (53) and the control valve (54) are arranged between the air tank (55) and the air inlet (24). The pressure gauge (51) is connected to the filtering tank (11) to detect the pressure in the accommodation cavity.

4. The coal slime filtration performance detection device according to claim 1, wherein Further included is a sealing component (6), the sealing component (6) includes a covering member (61) and a second sealing ring (62). The top surface of the filter tank (11) is provided with a second opening penetrating into the accommodating cavity. A second connecting portion (22) is provided on the outer sidewall of the filter tank (11) at an interval from its top end. The covering member (61) includes a covering plate (611) and a second surrounding wall (612). The second surrounding wall (612) is arranged along the edge of the covering plate (611) on the bottom surface of the covering plate (611). The covering plate (611) covers the top surface of the filter tank (11). The second surrounding wall (612) surrounds the filter tank (11) and is connected to the second connecting portion (22). A second sealing gap is formed by the bottom surface of the covering plate (611), the outer sidewall of the filter tank (11), the top surface of the second connecting portion (22), and the inner side surface of the second surrounding wall (612). The second sealing ring (62) is arranged in the second sealing gap to seal the gap between the filter tank (11) and the covering member (61).

5. The coal slime filtration performance detection device according to claim 4, wherein Further included is a stirring component (7), the stirring component (7) includes a cable (71), a sealing layer (75), a motor bracket (72), a stirring rod (73), and a stirring motor (74). The motor bracket (72), the stirring rod (73), and the stirring motor (74) are located in the accommodating cavity. The motor bracket (72) is fixedly connected to the bottom surface of the covering plate (611). The stirring motor (74) is fixedly connected to the motor bracket (72). The stirring rod (73) is vertically arranged and is connected to the stirring motor (74). The stirring motor (74) is used to drive the stirring rod (73) to rotate. The covering plate (611) is provided with a wire hole penetrating in the up-and-down direction. The wire hole is arranged corresponding to the second opening. The cable (71) passes through the wire hole and is connected to the stirring motor (74). The sealing layer (75) is arranged between the cable (71) and the wire hole. The sealing layer (75) is used to seal the gap between the cable (71) and the wire hole.

6. The coal slime filtration performance detection device according to claim 1, characterized in that Further included are a platform (8) and a fixing bracket (9). The fixing bracket (9) and the weighing device (3) are arranged on the top surface of the platform (8). The fixing bracket (9) includes a fixing base (91), a bracket vertical rod (92), and a bracket cross rod (93) connected in sequence. The fixing base (91) is arranged on the top surface of the platform (8). The bracket vertical rod (92) is arranged on the top surface of the fixing base (91). The bracket cross rod (93) is arranged on the outer side surface of the bracket vertical rod (92). The bracket cross rod (93) is higher than the collection cup (2). The bracket cross rod (93) is provided with a through hole penetrating in the up-and-down direction. The outer sidewall of the filter tank (11) is provided with a third connecting portion (23). The filter tank (11) passes through the through hole. The bottom surface of the third connecting portion (23) abuts against the top surface of the bracket cross rod (93) so that the filter tank (11) is fixedly connected to the bracket cross rod (93).

7. A method for detecting the filtration performance of slime, characterized in that Including the following steps: S1. Pour the slime water into the accommodating cavity of the stirring tank; S2. Clear the mass result detected by the weighing device (3); S3. The weighing device (3) transmits the mass result to the processor (4) every fixed time period. The processor (4) subtracts the previous mass result from the current mass result to obtain the mass change of the filtrate. The processor (4) subtracts the previous mass change of the filtrate from the current mass change of the filtrate to obtain the change of the current mass change of the filtrate; S4. When both the mass change of the filtrate and the change of the mass change of the filtrate are zero, stop the detection.

8. The coal slime filtration performance detection method according to claim 7, wherein It further includes the following steps: Between step S1 and step S2, stir the slime water in the accommodating cavity.

9. The coal slime filtration performance detection method according to claim 7, wherein, It further includes the following steps: Before step S2, increase the pressure in the accommodating cavity to make the pressure in the accommodating cavity greater than the atmospheric pressure.

10. The coal slime filtration performance detection method according to claim 7, wherein Detect using the slime filtration performance detection device according to any one of claims 1 to 6.

Images