CN115138107B - Gold mine tailing pulp dynamic flocculation sedimentation simulation experiment system and method - Google Patents
Gold mine tailing pulp dynamic flocculation sedimentation simulation experiment system and method Download PDFInfo
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- CN115138107B CN115138107B CN202210923932.8A CN202210923932A CN115138107B CN 115138107 B CN115138107 B CN 115138107B CN 202210923932 A CN202210923932 A CN 202210923932A CN 115138107 B CN115138107 B CN 115138107B
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- 238000004088 simulation Methods 0.000 title claims abstract description 95
- 238000005189 flocculation Methods 0.000 title claims abstract description 55
- 230000016615 flocculation Effects 0.000 title claims abstract description 55
- 238000004062 sedimentation Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 36
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 239000010931 gold Substances 0.000 title claims abstract description 20
- 229910052737 gold Inorganic materials 0.000 title claims abstract description 20
- 238000002156 mixing Methods 0.000 claims abstract description 31
- 238000002360 preparation method Methods 0.000 claims abstract description 27
- 238000005070 sampling Methods 0.000 claims abstract description 23
- 239000008394 flocculating agent Substances 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 75
- 238000010790 dilution Methods 0.000 claims description 47
- 239000012895 dilution Substances 0.000 claims description 47
- 239000007787 solid Substances 0.000 claims description 32
- 239000002002 slurry Substances 0.000 claims description 24
- 239000000243 solution Substances 0.000 claims description 17
- 238000004364 calculation method Methods 0.000 claims description 14
- 238000001514 detection method Methods 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 12
- 239000004576 sand Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 6
- 230000004907 flux Effects 0.000 claims description 6
- 238000000746 purification Methods 0.000 claims description 3
- 239000013049 sediment Substances 0.000 claims description 3
- 238000011049 filling Methods 0.000 abstract description 7
- 238000002474 experimental method Methods 0.000 abstract description 4
- 230000003311 flocculating effect Effects 0.000 abstract description 3
- 230000008719 thickening Effects 0.000 abstract description 3
- 238000013461 design Methods 0.000 abstract description 2
- 238000009533 lab test Methods 0.000 abstract description 2
- 238000003756 stirring Methods 0.000 description 14
- 230000002572 peristaltic effect Effects 0.000 description 10
- 230000006872 improvement Effects 0.000 description 8
- 230000001276 controlling effect Effects 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 3
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 239000002562 thickening agent Substances 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000000967 suction filtration Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000009489 vacuum treatment Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/01—Separation of suspended solid particles from liquids by sedimentation using flocculating agents
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/04—Investigating sedimentation of particle suspensions
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
Abstract
The invention discloses a gold mine tailing pulp dynamic flocculation sedimentation simulation experiment system and a method. The simulation experiment system comprises a tailing pulp preparation and conveying system, a flocculating agent preparation and conveying system, a flocculating and mixing system and a perspective simulation system. The perspective simulation system comprises a plurality of perspective simulation cylinders which are arranged in parallel, the height of each perspective simulation cylinder is more than 2m, and the cylinder wall is marked with height scales; the output end of the flocculation mixing system is respectively connected with the top ends of the perspective simulation cylinders through shunt pipes which are arranged in parallel, and each shunt pipe is respectively provided with a control valve; the wall of each perspective simulation cylinder is also provided with a plurality of sampling valves which are arranged along the height direction. The invention provides accurate experimental data and technical parameters for the design of a tailing pulp thickening and dewatering system in mine filling operation, and simultaneously provides a high-efficiency and convenient flocculation sedimentation experimental method for laboratory experiments.
Description
Technical Field
The invention relates to the technical field of tailing thickening and dewatering in gold mine filling mining, in particular to a dynamic flocculation sedimentation simulation experiment system and a dynamic flocculation sedimentation simulation experiment method.
Background
Green environmental protection is a major trend in mining industry development, and filling mining gradually becomes an important component of green development of mine enterprises. The tailing dehydration process of the mill is an important link of mine filling, and the quality of dehydration directly influences the filling quality.
Tailings with different physicochemical properties have different dewatering properties. At present, a vertical sand silo and a deep cone thickener are mainly adopted for concentrating and dehydrating tailings of a mill. The factory selection tailings are layered in the vertical section of the vertical sand bin, coarse tailings are arranged below, fine tailings are distributed in a gradient mode, the sand discharge mass concentration fluctuation is large, and the preparation quality and the preparation efficiency of filling slurry are seriously affected.
The existing dynamic concentration experiment machine has the following defects: (1) The static flocculation sedimentation experiments are carried out by adopting 1000ML measuring cylinders, the height is generally lower, the concentration of the underflow is less than 1m, the testing of the concentration of the underflow with different gradients and the dynamic flocculation sedimentation simulation experiments with different longitudinal sections can not be realized, and the concentration of the underflow has larger difference with the actual concentration; (2) The method adopts the modes of vacuum treatment, suction filtration, drying and weighing to detect the solid content of the overflow water, has large error, long time and complex operation, and can not realize dynamic on-line monitoring of the solid content of the overflow water; (3) The change of the concentration of the bottom flow in the dynamic feeding and discharging process cannot be simulated; (4) Only the optimal pulp dilution concentration and the optimal flocculant dosage can be obtained, and the accurate thickener solid flux can not be obtained.
In summary, the existing simulation experiment device and method cause low accuracy of laboratory detection results, large errors, unreasonable selection of a dense dehydration process of the tailing pulp, inaccurate technical parameters, large investment and poor operation effect.
Disclosure of Invention
The invention provides a gold mine tailing pulp dynamic flocculation sedimentation simulation experiment system and a method, which aim to: (1) Realizing underflow concentration tests with different gradients and dynamic flocculation sedimentation simulation experiments with different longitudinal sections; (2) The detection accuracy of the solid content of the overflow water is improved, and the detection efficiency is improved; (3) The underflow concentration detection in the dynamic feeding and discharging process is realized; (4) The efficiency of obtaining the optimal pulp dilution concentration and the optimal flocculant dosage is improved, and the solid flux is obtained.
The technical scheme of the invention is as follows:
the gold mine tailing pulp dynamic flocculation sedimentation simulation experiment system comprises a tailing pulp preparation conveying system, a flocculating agent preparation conveying system, a flocculation mixing system and a perspective simulation system, wherein the tailing pulp preparation conveying system and the flocculating agent preparation conveying system are respectively communicated with the flocculation mixing system, the flocculation mixing system is communicated with the perspective simulation system, the perspective simulation system comprises a plurality of perspective simulation cylinders which are arranged in parallel, the height of each perspective simulation cylinder is greater than 2m, and the cylinder walls are marked with height scales; the output end of the flocculation mixing system is respectively connected with the top ends of the perspective simulation cylinders through shunt pipes which are arranged in parallel, and each shunt pipe is respectively provided with a control valve;
the wall of each perspective simulation cylinder is also provided with a plurality of sampling valves which are arranged along the height direction.
As a further improvement of the gold mine tailing pulp dynamic flocculation sedimentation simulation experiment system: the upper end of each perspective simulation cylinder is respectively provided with an overflow water discharge valve, each overflow water discharge valve is connected to an overflow water collecting tank through an overflow water pipeline, and a turbidity meter for detecting the solid content of the overflow water is further arranged in the overflow water collecting tank.
As a further improvement of the gold mine tailing pulp dynamic flocculation sedimentation simulation experiment system: the system also comprises a dilution water conveying pipeline, wherein the inlet end of the dilution water conveying pipeline is communicated with the overflow water collecting tank, and the outlet end of the dilution water conveying pipeline is communicated with the tailing pulp preparation conveying system and is used for adding overflow water into tailing pulp; and the dilution water conveying pipeline is also provided with a submersible pump and a third flowmeter.
As a further improvement of the gold mine tailing pulp dynamic flocculation sedimentation simulation experiment system: the bottommost end of each perspective simulation cylinder is respectively provided with a first bottom end discharge valve, and the first bottom end discharge valves are communicated to the sedimentation tank through bottom end discharge pipelines; an underflow pump is arranged on the bottom end discharge pipeline, and a second bottom end discharge valve is arranged between two adjacent first bottom end discharge valves.
As a further improvement of the gold mine tailing pulp dynamic flocculation sedimentation simulation experiment system: the flocculant preparation and conveying system comprises a stirring tank, a first peristaltic pump and a first flowmeter;
the output end of the stirring tank is communicated with the flocculation mixing system through a flocculant conveying pipeline; the first peristaltic pump and the first flowmeter are both arranged on the flocculant conveying pipeline;
the tailing pulp preparation and conveying system comprises a stirring barrel, a second peristaltic pump, a second flowmeter and a tailing pulp buffer tank;
the output end of the stirring barrel is communicated with the tailing pulp buffer tank through a tailing pulp conveying pipeline, the second peristaltic pump and the second flowmeter are both arranged on the tailing pulp conveying pipeline, and the output end of the tailing pulp buffer tank is communicated with the flocculation mixing system.
As a further improvement of the gold mine tailing pulp dynamic flocculation sedimentation simulation experiment system: the flocculation mixing system comprises a branch pipe and a central feeding cylinder; the branched pipes are multiple groups and are uniformly distributed above the central feeding cylinder, and the upper ends of the branched pipes are respectively connected with the flocculant conveying pipelines;
the output end of the tailing pulp buffer tank is arranged on the side wall of the central feeding barrel, and tailing pulp is conveyed into the central feeding barrel along the tangential direction of the central feeding barrel.
As a further improvement of the gold mine tailing pulp dynamic flocculation sedimentation simulation experiment system: the system also comprises a computer, wherein the computer is connected with the tailing pulp preparation and conveying system, the flocculating agent preparation and conveying system, the flocculating mixing system and the electric valve and the detection device in the perspective simulation system through data transmission signal lines.
The invention also discloses a simulation experiment method based on the gold mine tailing pulp dynamic flocculation sedimentation simulation experiment system, which comprises the following steps:
step 1, determining the optimal dilution concentration of tailing slurry; the method comprises the following specific steps:
1-1, setting a plurality of groups of different tailing slurry conveying quantities Q1, and fixing a dilution water quantity Q2 and a flocculating agent solution conveying quantity Q3-0;
1-2, for different tailings slurry conveying amounts Q1, respectively carrying out the following operations: placing the tailing pulp, the dilution water and the flocculating agent into a flocculation mixing system according to the current Q1, Q2 and Q3-0 respectively, then conveying the mixed liquid into one of perspective simulation cylinders for sedimentation, measuring the solid content of overflow water after time T, and measuring the treatment capacity value=M/(T.s) under the condition, wherein M is the mass of treated tailings, T is sedimentation time, and S is the cross-sectional area of the perspective simulation cylinder;
1-3, selecting a maximum value Q1-1 of Q1 under the condition that the solid content is less than 200 mg/L and a minimum value Q1-2 of Q1 under the condition that the solid content is greater than 200 mg/L, taking a plurality of new tailings slurry conveying quantities Q1 from the interval [ Q1-1, Q1-2], returning to the step 1-2 until the corresponding tailings slurry conveying quantity Q1-3 is found when the solid content is equal to 200 mg/L, and calculating the optimal dilution concentration according to the Q1-3 and the Q2;
step 2, determining the optimal flocculant dosage; the method comprises the following specific steps:
2-1, setting a plurality of groups of different flocculant solution conveying quantities Q3, and fixing tailing pulp conveying quantities Q1-3 and a fixed dilution water quantity Q2;
2-2, for different flocculant solution delivery amounts Q3, the following operations were performed: placing the tailing pulp, the dilution water and the flocculating agent into a flocculation mixing system according to the current Q1-3, Q2 and Q3 respectively, then conveying the mixed liquid into one of perspective simulation cylinders for sedimentation, measuring the height of a mud layer and the solid content of overflow water after time T, and measuring the treatment capacity value under the condition;
2-3, selecting flocculant solution conveying quantity Q3 corresponding to a perspective simulation cylinder with the lowest mud layer height under the condition that the solid content is less than 200 mg/L as the optimal flocculant dosage Q3-1;
step 3, simulating a dynamic feeding and discharging process, and detecting the underflow concentrations at different heights; the method comprises the following specific steps: placing tailing pulp, dilution water and flocculant into a flocculation mixing system according to the conveying quantity Q1-3 of the tailing pulp, the conveying quantity Q2 of the dilution water and the conveying quantity Q3-1 of the flocculant solution, then synchronously conveying the mixed liquid into different perspective simulation cylinders for sedimentation, controlling the heights of mud layers in all the perspective simulation cylinders to be 2m by controlling sampling valves on the perspective simulation cylinders, and then respectively selecting one sampling valve with different heights for combined dynamic sampling under the condition that the heights of the mud layers are unchanged, so as to obtain the underflow concentrations with different heights.
As a further improvement of the above simulation experiment method, further comprising step 4: the bottommost underflow concentration c was sampled through the first bottom discharge valve and the reasonable solids flux of the tailings slurry = (67.9-100×c)/22.64 was calculated.
As a further improvement of the above simulation experiment method:
and 5, acquiring the relation between the height of the mud layer and the pressure value: bottom according to different mud layer heightsObtaining the corresponding relation between the mud layer height and the underflow concentration by the detection value of the flow concentration, and establishing a calculation relation model of the mud layer height H and the pressure value P of the height according to the corresponding relation between the underflow concentration and the pressure value of the height: h= (P-P0) (1+ap b )/(ρ Sand -1) P is the pressure value of the height, P0 is the pressure value of the bottom of the water purification layer above the mud layer, ρ Sand Is the density of the sediment; substituting a plurality of groups of mud layer heights H and pressure values P of the heights in the experimental process into the calculation model to obtain values of parameters a and b corresponding to the current tailings; the mud layer height refers to the height relative to the bottommost end of the mud layer;
and 6, obtaining the following fitting calculation formula according to the relation between the bottommost underflow concentration c and the total height h of the mud layer through dynamic detection sampling:
h=2.74*(1/c-1) 1.6 +21.88*(1/c-1) -0.6 -33.32 。
compared with the prior art, the invention has the following beneficial effects: (1) The system adopts a structure of a plurality of parallel perspective simulation barrels, and a plurality of sampling valves are arranged on the barrel wall along the height direction, so that synchronous sedimentation can be realized, sampling can be performed from different heights, the whole process can be observed and recorded, visual and visual effects are realized, the flocculation sedimentation experimental study of gold mine under the conditions of different tailing pulp and different flocculating agents can be provided, and the underflow concentration tests of different gradients and dynamic flocculation sedimentation simulation experiments of different longitudinal sections are realized; (2) The invention achieves the purpose of detecting the solid content by detecting the turbidity of the overflow water, and the accuracy and the efficiency are obviously improved; (3) By adjusting the sampling valve, the heights of the mud layers in all the perspective simulation cylinders can be ensured to be consistent with each other, and the underflow concentration detection in the dynamic feeding and discharging process is realized; (4) The invention can use a plurality of perspective simulation cylinders to carry out sedimentation according to different dilution concentrations or flocculant dosage, and adjust the pulp dilution concentration and the flocculant dosage in real time, so as to quickly obtain the optimal pulp dilution concentration and the optimal flocculant dosage; (5) The invention also provides a calculation model of solid flux, a calculation model of the relation between the height of the mud layer and the pressure value and a calculation relation model of the bottom-most underflow concentration and the total height of the mud layer, provides accurate experimental data and technical parameters for the design of a tailing pulp thickening and dewatering system in mine filling operation, and simultaneously provides a high-efficiency and convenient flocculation sedimentation experimental method for laboratory experiments.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the system;
fig. 2 is a top view of a tailings slurry buffer tank, central feed barrel, shunt tubes, and perspective simulation barrel portion.
In the figure:
1. a stirring tank; 2. a first peristaltic pump; 3. a first flowmeter; 4. a branch pipe; 5. a stirring barrel; 6. a second peristaltic pump; 7. a second flowmeter; 8. a tailing pulp buffer tank; 9. a central feed cylinder; 10. a shunt; 11. perspective simulation cylinder; 12. an overflow water discharge valve; 13. a sampling valve; 14. a turbidity meter; 15. an overflow water collection tank; 16. a data transmission signal line; 17. a mobile platform; 18. a first bottom end drain valve; 19. a second bottom end drain valve; 20. a sedimentation tank; 21. a computer; 22. a data acquisition instrument; 23. an underflow pump; 24. a first discharge valve; 25. a second discharge valve; 26. submersible pump; 27. a third flowmeter; 28. and a control valve.
Detailed Description
The technical scheme of the invention is described in detail below with reference to the accompanying drawings:
as shown in fig. 1 and 2, a gold mine tailing pulp dynamic flocculation sedimentation simulation experiment system comprises a tailing pulp preparation and conveying system, a flocculating agent preparation and conveying system, a flocculation mixing system and a perspective simulation system. The tailing pulp preparation and conveying system and the flocculating agent preparation and conveying system are respectively communicated with the flocculation mixing system, and the flocculation mixing system is communicated with the perspective simulation system.
Specifically, the flocculant preparation and conveying system comprises a stirring tank 1, a first peristaltic pump 2 and a first flowmeter 3. The output end of the stirring tank 1 is communicated with the flocculation mixing system through a flocculant conveying pipeline; the first peristaltic pump 2 and the first flowmeter 3 are both arranged on the flocculant conveying pipeline.
The tailing pulp preparation and conveying system comprises a stirring barrel 5, a second peristaltic pump 6, a second flowmeter 7 and a tailing pulp buffer tank 8. The output end of the stirring barrel 5 is communicated with the tailing pulp buffer tank 8 through a tailing pulp conveying pipeline, the second peristaltic pump 6 and the second flowmeter 7 are both arranged on the tailing pulp conveying pipeline, and the output end of the tailing pulp buffer tank 8 is communicated with the flocculation mixing system.
The flocculation mixing system comprises a branch pipe 4 and a central feeding barrel 9. The branched pipes 4 are multiple groups and are uniformly distributed above the central feeding barrel 9, the upper ends of the branched pipes 4 are respectively connected with the flocculant conveying pipelines, and flocculant solutions can be uniformly thrown into the central feeding barrel 9.
The output end of the tailing pulp buffer tank 8 is arranged on the side wall of the central feeding barrel 9, and tailing pulp is conveyed into the central feeding barrel 9 along the tangential direction of the central feeding barrel 9.
The perspective simulation system comprises a plurality of perspective simulation barrels 11 which are arranged in parallel. The perspective simulation cylinder 11 is mounted on a mobile platform 17. The output end of the flocculation mixing system is respectively connected with the top ends of the perspective simulation cylinders 11 through shunt pipes 10 which are arranged in parallel, and control valves 28 are respectively arranged on the shunt pipes 10.
The height of the perspective simulation cylinder 11 is more than 2m, and the cylinder wall is marked with height scales. The wall of each perspective simulation cylinder 11 is also provided with a plurality of sampling valves 13 which are arranged along the height direction. In the embodiment, the diameter of the perspective simulation cylinder 11 is 0.3m, the height is 2.5m, and the spacing between the sampling valves 13 is 0.3m.
The upper end of each perspective simulation cylinder 11 is provided with an overflow water discharge valve 12, respectively, in this embodiment, the overflow water discharge valve 12 is 0.3m from the top. Each overflow water discharge valve 12 is connected to an overflow water collecting tank 15 through an overflow water pipeline, and a turbidity meter 14 for detecting the solid content of the overflow water is further arranged in the overflow water collecting tank 15. By detecting the turbidity of the overflow water, the solids content of the overflow water can be measured.
The system further comprises a dilution water conveying pipeline, wherein the inlet end of the dilution water conveying pipeline is communicated with the overflow water collecting tank 15, and the outlet end of the dilution water conveying pipeline is communicated with the tailing pulp preparation conveying system and is used for adding overflow water into tailing pulp. The dilution water delivery pipe is also provided with a submersible pump 26 and a third flowmeter 27. The submersible pump 26 is used to deliver overflow water to the tailings slurry buffer tank 8 for dilution of the tailings slurry. The bottom of the overflow water collecting tank 15 is provided with a first discharge valve 24.
Further, the bottommost end of each perspective simulation barrel 11 is respectively provided with a first bottom end discharge valve 18, and the first bottom end discharge valves 18 are communicated to a sedimentation tank 20 through bottom end discharge pipelines. The bottom of the sedimentation tank 20 is provided with a second discharge valve 25. The bottom discharge line is provided with an underflow pump 23 and a second bottom discharge valve 19 located between two adjacent first bottom discharge valves 18. By controlling the opening and closing of the different first 18 and second 19 bottom discharge valves, it is possible to sample the bottom most mud layer of a certain perspective simulation cartridge 11 individually.
The system also comprises a computer 21, wherein the computer 21 is connected with an electric valve and a detection device in the tailing pulp preparation and conveying system, the flocculating agent preparation and conveying system, the flocculating and mixing system and the perspective simulation system through a data transmission signal line 16. The computer 21 is used for controlling the stirring speed of the stirring tank 5 and the stirring tank 1, and can control the rotation speed of the corresponding pump according to the flow value of the flowmeter on each pipeline, and can also control the opening and closing of each electric valve.
The simulation experiment method based on the system comprises the following steps:
step 1, determining the optimal dilution concentration of tailing slurry; the method comprises the following specific steps:
1-1, setting a plurality of groups of different tailing slurry conveying quantities Q1, and fixing the dilution water quantity Q2 and the flocculating agent solution conveying quantity Q3-0. In this example, 6 groups Q1, 0.03 m, 0.07 m, 0.13 m, 0.22 m, 0.37 m, 0.67 m, respectively, were selected. The concentration of the tailing pulp before dilution is 40 percent, and Q2 is 0.3m 3 And/h, the concentration after dilution is 5%, 10%, 15%, 20%, 25% and 30%, respectively. The concentration of the flocculant solution is 1 per mill. The computer 21 is responsible for regulating the delivery and ensuring uniform stirring.
1-2, for different tailings slurry conveying amounts Q1, respectively carrying out the following operations: separating the tailing pulp, dilution water and flocculantThe flocculation mixing system was placed in the current Q1, Q2 and Q3-0 respectively, and the mixed liquor was then fed into one of the perspective simulation cylinders 11 for sedimentation, the solids content of the overflow water was measured after a time T (typically 1 hour), and the throughput value under this condition was measured = M/(T x S), M being the mass of tailings treated (the amount of treated ore), for a use of 0.3M 3 Dilution water per h was diluted from 40% to 5% tailings slurry, M/t=0.3/(1/5% -1/40%), and other pairs of concentrations were analogized. T is the sedimentation time and S is the cross-sectional area (0.07065 square meters) of the perspective simulation cartridge 11. In this example, the treatment mineral amounts of 6 groups of 1 hour were 0.02t/h, 0.04t/h,0.07t/h,0.12t/h,0.20t/h,0.36t/h, respectively, and the final calculated treatment capacity values were 0.24t/m, respectively 2 、0.57t/m 2 、1.02t/m 2 、1.70t/m 2 、2.83t/m 2 、5.10t/m 2 。
1-3, selecting a maximum Q1-1 (corresponding to a dilution concentration of 15% in the embodiment of 0.13 m/h) with a solid content of less than 200 mg/L and a minimum Q1-2 (corresponding to a dilution concentration of 20% in the embodiment of 0.22 m/h) with a solid content of greater than 200 mg/L, taking a plurality of new tailings slurry transport amounts Q1 from the interval [ Q1-1, Q1-2], and returning to the step 1-2 until the corresponding tailings slurry transport amount Q1-3 with a solid content of 200 mg/L is found, and calculating an optimal dilution concentration (16% in the embodiment) according to Q1-3 and Q2.
Step 2, determining the optimal flocculant dosage; the method comprises the following specific steps:
2-1, setting a plurality of groups of different flocculant solution conveying volumes Q3, and setting a tailing slurry conveying volume Q1-3 and a dilution water volume Q2.
2-2, for different flocculant solution delivery amounts Q3, the following operations were performed: the tailing pulp, the dilution water and the flocculating agent are respectively put into a flocculation mixing system according to the current Q1-3, Q2 and Q3, then the mixed liquid is conveyed into one of the perspective simulation cylinders 11 for sedimentation, the mud layer height and the solid content of overflow water are measured after the time T, and the treatment capacity value under the condition is measured.
2-3, selecting the flocculant solution conveying quantity Q3 corresponding to the perspective simulation cylinder 11 with the lowest mud layer height under the condition that the solid content is less than 200 mg/L as the optimal flocculant using quantity Q3-1.
Step 3, simulating a dynamic feeding and discharging process, and detecting the underflow concentrations at different heights; the method comprises the following specific steps: placing tailing pulp, dilution water and flocculant into a flocculation mixing system according to the conveying quantity Q1-3 of the tailing pulp, the conveying quantity Q2 of the dilution water and the conveying quantity Q3-1 of the flocculant solution, then synchronously conveying the mixed liquid into different perspective simulation cylinders 11 for sedimentation, controlling the heights of mud layers in all the perspective simulation cylinders 11 to be 2m by controlling sampling valves 13 on each perspective simulation cylinder 11, and then respectively selecting one sampling valve 13 with different heights for combined dynamic sampling under the condition that the heights of the mud layers are unchanged, so as to obtain the underflow concentrations with different heights. In this example, dynamic sampling was performed at arbitrary combinations of 0.3m, 0.6m, 0.9m, 1.2m, 1.5m, and 1.8 m.
And 4, sampling the bottommost underflow concentration c through the first bottom discharge valve 18, and calculating the reasonable solid flux of the tailing slurry to be (67.9-100 c)/22.64.
Step 5, obtaining the relation between the height of the mud layer and the pressure value: obtaining the corresponding relation between the mud layer height and the bottom flow concentration according to the detection values of the bottom flow concentrations of different mud layer heights, and establishing a calculation relation model of the mud layer height H and the pressure value P of the height according to the corresponding relation between the bottom flow concentration and the pressure value of the height: h= (P-P0) (1+ap b )/(ρ Sand -1) P is the pressure value of the height, P0 is the pressure value of the bottom of the water purification layer above the mud layer, ρ Sand Is the density of the sediment.
Substituting a plurality of groups of mud layer heights H and pressure values P of the heights in the experimental process into the calculation model to obtain values of parameters a and b corresponding to the current tailings; the mud layer height refers to the height relative to the bottommost end of the mud layer.
By means of the calculation model, in an actual mine, the height of a certain position in the mud layer can be calculated by monitoring the pressure of the mud layer at the certain position.
Step 6, obtaining the following fitting calculation formula according to the relation between the bottommost underflow concentration c and the total height h of the mud layer through dynamic detection sampling:
h=2.74*(1/c-1) 1.6 +21.88*(1/c-1) -0.6 -33.32。
h is m.
By this calculation relationship, in an actual mine, the total height of a certain mud layer can be estimated by monitoring the bottom flow concentration at the bottommost part of the mud layer.
Claims (3)
1. A gold mine tailing pulp dynamic flocculation sedimentation simulation experiment method is characterized by comprising the following steps of: based on the following gold mine tailing pulp dynamic flocculation sedimentation simulation experiment system:
the gold mine tailing pulp dynamic flocculation sedimentation simulation experiment system comprises a tailing pulp preparation conveying system, a flocculating agent preparation conveying system, a flocculation mixing system and a perspective simulation system, wherein the tailing pulp preparation conveying system and the flocculating agent preparation conveying system are respectively communicated with the flocculation mixing system, the flocculation mixing system is communicated with the perspective simulation system, the perspective simulation system comprises a plurality of perspective simulation cylinders (11) which are arranged in parallel, the height of each perspective simulation cylinder (11) is greater than 2m, and the cylinder wall is marked with height scales; the output end of the flocculation mixing system is respectively connected with the top ends of the perspective simulation cylinders (11) through shunt pipes (10) which are arranged in parallel, and each shunt pipe (10) is respectively provided with a control valve (28);
the cylinder wall of each perspective simulation cylinder (11) is also provided with a plurality of sampling valves (13) which are arranged along the height direction;
the upper end part of each perspective simulation cylinder (11) is respectively provided with an overflow water discharge valve (12), each overflow water discharge valve (12) is connected to an overflow water collecting tank (15) through an overflow water pipeline, and a turbidity meter (14) for detecting the solid content of overflow water is also arranged in each overflow water collecting tank (15);
the system also comprises a dilution water conveying pipeline, wherein the inlet end of the dilution water conveying pipeline is communicated with the overflow water collecting tank (15), and the outlet end of the dilution water conveying pipeline is communicated with the tailing pulp preparation conveying system and is used for adding overflow water into tailing pulp; a submersible pump (26) and a third flowmeter (27) are further arranged on the dilution water conveying pipeline;
the bottommost end of each perspective simulation cylinder (11) is respectively provided with a first bottom end discharge valve (18), and the first bottom end discharge valves (18) are communicated to a sedimentation tank (20) through bottom end discharge pipelines; an underflow pump (23) and a second bottom discharge valve (19) positioned between two adjacent first bottom discharge valves (18) are arranged on the bottom discharge pipeline;
the simulation experiment method comprises the following steps:
step 1, determining the optimal dilution concentration of tailing slurry; the method comprises the following specific steps:
1-1, setting a plurality of groups of different tailing slurry conveying quantities Q1, and fixing a dilution water quantity Q2 and a flocculating agent solution conveying quantity Q3-0;
1-2, for different tailings slurry conveying amounts Q1, respectively carrying out the following operations: placing the tailing pulp, the dilution water and the flocculating agent into a flocculation mixing system according to the current Q1, Q2 and Q3-0 respectively, then conveying the mixed liquid into one of perspective simulation barrels (11) for sedimentation, measuring the solid content of overflow water after time T, and measuring the treatment capacity value=M/(T.s) under the condition, wherein M is the mass of treated tailings, T is the sedimentation time, and S is the cross-sectional area of the perspective simulation barrel (11);
1-3, selecting a maximum value Q1-1 of Q1 under the condition that the solid content is less than 200 mg/L and a minimum value Q1-2 of Q1 under the condition that the solid content is greater than 200 mg/L, taking a plurality of new tailings slurry conveying quantities Q1 from the interval [ Q1-1, Q1-2], returning to the step 1-2 until the corresponding tailings slurry conveying quantity Q1-3 is found when the solid content is equal to 200 mg/L, and calculating the optimal dilution concentration according to the Q1-3 and the Q2;
step 2, determining the optimal flocculant dosage; the method comprises the following specific steps:
2-1, setting a plurality of groups of different flocculant solution conveying quantities Q3, and fixing tailing pulp conveying quantities Q1-3 and a fixed dilution water quantity Q2;
2-2, for different flocculant solution delivery amounts Q3, the following operations were performed: placing the tailing pulp, the dilution water and the flocculating agent into a flocculation mixing system according to the current Q1-3, Q2 and Q3 respectively, then conveying the mixed liquid into one of perspective simulation cylinders (11) for sedimentation, measuring the height of a mud layer and the solid content of overflow water after time T, and measuring the treatment capacity value under the condition;
2-3, selecting flocculant solution conveying quantity Q3 corresponding to a perspective simulation cylinder (11) with the lowest mud layer height under the condition that the solid content is less than 200 mg/L as the optimal flocculant using quantity Q3-1;
step 3, simulating a dynamic feeding and discharging process, and detecting the underflow concentrations at different heights; the method comprises the following specific steps: placing tailing pulp, dilution water and flocculant into a flocculation mixing system according to the conveying quantity Q1-3 of the tailing pulp, the conveying quantity Q2 of the dilution water and the conveying quantity Q3-1 of the flocculant solution, then synchronously conveying the mixed liquid into different perspective simulation barrels (11) for sedimentation, controlling the heights of mud layers in all the perspective simulation barrels (11) to be 2m by controlling sampling valves (13) on the perspective simulation barrels (11), and then respectively selecting sampling valves (13) with different heights by each perspective simulation barrel (11) under the condition that the heights of the mud layers are unchanged, and carrying out combined dynamic sampling to obtain the underflow concentrations with different heights.
2. The gold mine tailing pulp dynamic flocculation sedimentation simulation experiment method as set forth in claim 1, further comprising the step of 4: the bottommost underflow concentration c is sampled through a first bottom discharge valve (18) to calculate the reasonable solids flux = (67.9-100×c)/22.64 of the tailings slurry.
3. The gold mine tailing pulp dynamic flocculation sedimentation simulation experiment method as set forth in claim 1, wherein:
and 5, acquiring the relation between the height of the mud layer and the pressure value: obtaining the corresponding relation between the mud layer height and the bottom flow concentration according to the detection values of the bottom flow concentrations of different mud layer heights, and establishing a calculation relation model of the mud layer height H and the pressure value P of the height according to the corresponding relation between the bottom flow concentration and the pressure value of the height: h= (P-P0) (1+ap b )/(ρ Sand -1) P is the pressure value of the height, P0 is the pressure value of the bottom of the water purification layer above the mud layer, ρ Sand Is the density of the sediment; substituting a plurality of groups of mud layer heights H and pressure values P of the heights in the experimental process into the calculation relation model to obtain values of parameters a and b corresponding to the current tailings; the mud layer height refers to the height relative to the bottommost end of the mud layer;
and 6, obtaining the following fitting calculation formula according to the relation between the bottommost underflow concentration c and the total height h of the mud layer through dynamic detection sampling:
h=2.74*(1/c-1) 1.6 +21.88*(1/c-1) -0.6 -33.32 。
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