CN117654121A - Dense dehydration method for copper smelting slag flotation tailings - Google Patents
Dense dehydration method for copper smelting slag flotation tailings Download PDFInfo
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- CN117654121A CN117654121A CN202311668908.5A CN202311668908A CN117654121A CN 117654121 A CN117654121 A CN 117654121A CN 202311668908 A CN202311668908 A CN 202311668908A CN 117654121 A CN117654121 A CN 117654121A
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000005188 flotation Methods 0.000 title claims abstract description 32
- 239000002893 slag Substances 0.000 title claims abstract description 29
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 238000003723 Smelting Methods 0.000 title claims abstract description 21
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 21
- 239000010949 copper Substances 0.000 title claims abstract description 21
- 230000018044 dehydration Effects 0.000 title claims description 12
- 238000006297 dehydration reaction Methods 0.000 title claims description 12
- 239000002562 thickening agent Substances 0.000 claims abstract description 90
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000007788 liquid Substances 0.000 claims abstract description 45
- 239000000919 ceramic Substances 0.000 claims abstract description 34
- 230000008569 process Effects 0.000 claims abstract description 23
- 238000002156 mixing Methods 0.000 claims abstract description 18
- 238000007872 degassing Methods 0.000 claims abstract description 15
- 238000004062 sedimentation Methods 0.000 claims abstract description 11
- 238000009826 distribution Methods 0.000 claims abstract description 9
- 238000003860 storage Methods 0.000 claims abstract description 7
- 238000001914 filtration Methods 0.000 claims abstract description 5
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 29
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 29
- 239000004571 lime Substances 0.000 claims description 29
- 238000003756 stirring Methods 0.000 claims description 23
- 239000000706 filtrate Substances 0.000 claims description 16
- 238000004064 recycling Methods 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 6
- 238000011010 flushing procedure Methods 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000000839 emulsion Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 2
- 239000011707 mineral Substances 0.000 claims description 2
- 230000009466 transformation Effects 0.000 abstract description 11
- 239000006228 supernatant Substances 0.000 abstract description 10
- 238000000926 separation method Methods 0.000 abstract description 4
- 238000005189 flocculation Methods 0.000 abstract description 2
- 230000016615 flocculation Effects 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 14
- 230000002829 reductive effect Effects 0.000 description 10
- 238000007599 discharging Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000007787 solid Substances 0.000 description 6
- 230000002159 abnormal effect Effects 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000008719 thickening Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000011001 backwashing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005352 clarification Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention discloses a method for concentrating and dehydrating copper smelting slag flotation tailings, which belongs to the technical field of copper smelting slag flotation tailings and comprises the following steps: fully mixing flotation tailings and flocculation mixed liquor in a thickener degassing tank, and then feeding the mixture into a tailings thickener; installing a mud layer interface instrument for detecting interface distribution conditions of a tailing concentration sedimentation process in the tailing thickener on line; delivering the underflow ore pulp into a ceramic filter for filtering and dewatering; and conveying the produced slag tailings to a tailing storage yard. According to the scheme, the mud layer interface instrument measures the internal interface distribution condition of the thickener, can accurately master the layered interface condition, obtains the operation trend of controlling the solid-liquid separation condition under different conditions, realizes the overflow of a good clear liquid layer and the underflow pulp with proper concentration in the tailing thickener, avoids the overflow water of the tailing thickener from being muddy or harrowed, and is clear after the transformation, and no mixing phenomenon occurs; the thickness of the supernatant layer in the tailings thickener is relatively stable.
Description
Technical Field
The invention belongs to the technical field of copper smelting slag flotation tailings, and particularly relates to a method for concentrating and dehydrating copper smelting slag flotation tailings.
Background
The slag tailings after copper smelting slag flotation can be directly used as raw materials for producing cement due to high iron content, so that the slag tailings are required to be correspondingly treated and then recycled, and the flotation tailings are generally required to be subjected to dense dehydration.
The existing tailing thickening and dewatering device basically adopts a thickener or a cyclone grading thickener, in the using process, a clear water layer and a heavy mud layer are required to be measured manually frequently, the influence of manual experience and an operator method is large, data are not accurate enough, the measuring period is long, the data are lagged, special conditions such as running muddy state cannot be found in time, and the distribution condition of a sedimentation layer and a mud layer cannot be known accurately.
In addition, due to the uncontrollable factors such as unstable ore feeding amount and improper ore grinding operation, excessive addition of flocculant is easy to cause overlarge clear liquid layer, or the condition that flocculant is not timely added when a mud layer is in an ascending trend, fluctuation of flocculant addition is caused, and a fault accident of suspension and harrow stopping of a thickener caused by flocculant waste and even out-of-control of the clear liquid layer occurs.
Therefore, it is necessary to provide a method for dense dehydration of copper smelting slag flotation tailings to solve the above technical problems.
Disclosure of Invention
The invention aims to provide a method for concentrating and dehydrating copper smelting slag flotation tailings to solve the technical problems.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the method for concentrating and dehydrating the copper smelting slag flotation tailings comprises the following steps:
s1: the flotation tailings are conveyed to a thickener degassing tank through a tailings conveying pump;
s2: the flocculant in the flocculant bin is conveyed into a stirring barrel through a screw feeder, and process backwater is added into the stirring barrel, so that the flocculant and water are mixed to generate mixed liquid;
s3: the mixed liquid is conveyed into a degassing tank of the thickener through a mixing conveying pump to be fully mixed with flotation tailings in the degassing tank, and the mixed liquid is fed into a tailings thickener after being mixed;
s4: a mud layer interface instrument is arranged at the overflow weir position of the tailing thickener and is used for detecting the interface distribution condition of the tailing concentration and sedimentation process in the tailing thickener on line and feeding data back to a control center;
s5: the underflow ore pulp in the tailing thickener is conveyed into a ceramic filter for filtering and dewatering through an underflow pump;
s6: the tailing filtrate produced in the ceramic filter enters a tailing filtrate tank, the produced slag tailings are conveyed to a tailing storage yard for storage through a rubber belt conveyor, and the discharged materials during cleaning of the ceramic filter are conveyed to a thickener degassing tank through a mineral discharging conveying pump.
As a further scheme of the invention: the tailings thickener is provided with an operating pressure detection device, a harrow frame height detection device and an alarm device, wherein the operating pressure device and the harrow frame height detection device are used for detecting the operating pressure and the harrow frame height of the tailings thickener in real time and feeding data back to a control center.
As a further scheme of the invention: and the flocculant in the flocculant bin is lime, and lime emulsion is generated by mixing the flocculant with water in the stirring barrel.
As a further scheme of the invention: the pneumatic control valve and the flowmeter are arranged on a water supply pipeline between the stirring barrel and the process backwater and are respectively used for adjusting the water supply quantity entering the stirring barrel and measuring the water inflow quantity, and the flowmeter is also arranged on a pipeline between the mixing delivery pump and the thickener degassing tank and is used for measuring the mixed liquid flow.
As a further scheme of the invention: the stirring barrel is provided with a liquid level meter which is used for measuring the liquid level of the mixed liquid in the stirring barrel in real time, and the liquid level meter is in signal connection with the mixed conveying pump.
As a further scheme of the invention: a tailing distributing groove is arranged between the underflow pump and the ceramic filter, and the underflow pump conveys the underflow pulp into the tailing distributing groove and distributes the underflow pulp into the ceramic filter through the tailing distributing groove.
As a further scheme of the invention: and a concentration meter is arranged on a conveying pipeline between the underflow pump and the tailing distributing groove and used for measuring the conveying concentration of the underflow ore pulp in real time and feeding data back to a control center.
As a further scheme of the invention: and overflow water in the tailing thickener flows out to a water return tank through the overflow weir for recycling.
As a further scheme of the invention: and one part of tailing filtrate in the tailing filtrate tank enters the water return tank for recycling, and the other part of tailing filtrate is conveyed to the ceramic filter for backwashing through a flushing water pump.
As a further scheme of the invention: the belt conveyor is provided with an electronic belt scale for measuring the output of the slag tailings on the belt conveyor.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the scheme, the mud layer interface instrument measures the internal interface distribution condition of the tailing thickener every fifteen minutes, the measured data is fed back to the control center, the mud layer interface instrument can accurately master the internal layered interface condition of the tailing thickener, the collected interface data is analyzed to obtain the operation trend of controlling the solid-liquid separation condition under different conditions, the intelligent monitoring of the concentration and sedimentation process of the tailing thickener is realized through the control center, the good overflow of a clear liquid layer and underflow pulp with proper concentration in the tailing thickener are realized, the overflow backwater with high clarity is finally obtained for production and recycling, and the production reduction or production shutdown condition caused by the overflow and harrowing accident is avoided.
2. The overflow water of the tailing thickener modified by the scheme is clarified, and no mixing phenomenon occurs; the thickness of the clear liquid layer in the tailing thickener is relatively stable, the difference between the clear liquid layer and the manual measurement result is not great, the tailing thickener is operated in a low-pressure state for a long time after transformation, and the harrow frame is basically in the lowest position, which means that the solid stock in the tailing thickener is relatively low, and the safe and stable operation of the tailing thickener can be ensured.
3. The concentration of the underflow ore pulp after the scheme is improved can be relatively stable, and the stable operation of tailing dehydration is maintained. Before transformation, the tailings are filtered with large water content, the ceramic filter discharging hopper is easy to pile ores, accidents of a large number of ceramic plates of the ceramic filter are easy to cause, each ceramic filter needs to be poked by a person at any time, and time and labor are wasted; the water content of the tailings after transformation is basically controlled within 12%, the stacking phenomenon is greatly improved, only the discharging hopper of the ceramic filter is needed to be checked regularly, and the accumulated ore is basically cleaned only once per shift, so that more labor force is saved, and the production efficiency is greatly improved.
Drawings
FIG. 1 is a schematic diagram of a dense dewatering process of tailings according to the present invention;
FIG. 2 is a schematic view of the internal interface level of the tailings thickener of the present invention;
FIG. 3 is a schematic flow chart of the lime addition control loop of the present invention;
FIG. 4 is a schematic diagram of a relationship module of the tailings thickener of the present invention in relation to each other;
fig. 5 is a schematic diagram of a control flow of the tailings thickener of the present invention.
The reference numerals in the figures illustrate:
2. a tailings transfer pump; 3. a tailings thickener; 5. an underflow pump; 6. a concentration meter; 7. a tailings distribution tank; 8. a ceramic filter; 9. a tailing pond; 10. a flushing water pump; 11. a rubber belt conveyor; 12. an electronic belt scale; 14. a flocculant bin; 15. a screw feeder; 16. a stirring barrel; 17. a liquid level gauge; 18. a mixing delivery pump; 19. a tailings yard; 21. a mine discharge conveying pump; 22. a mud layer interface instrument; 24. a pneumatic control valve; 25. a flow meter; 26. a thickener degassing tank.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-2, a method for dense dehydration of copper smelting slag flotation tailings, specifically comprises the following steps:
s1: the flotation tailings are conveyed to a thickener degassing tank 26 through a tailings conveying pump 2, the concentration of ore pulp in the flotation tailings is about 30%, and the fineness (-400 mesh content) is about 85%;
s2: the flocculant in the flocculant bin 14 is conveyed into a stirring barrel 16 through a screw feeder 15, and process backwater is added into the stirring barrel 16, so that the flocculant and water are mixed to generate mixed liquid; the process backwater utilizes the water in a backwater pool;
s3: the mixed liquor is conveyed to a thickener degassing tank 26 through a mixing conveying pump 18 to be fully mixed with flotation tailings in the thickener, and the mixed liquor is fed into a tailings thickener 3; the tailings thickener accelerates the concentration and sedimentation of tailings by adding the flocculant mixed liquid, and the interior of the tailings thickener 3 is divided into a clear liquid layer, a sedimentation layer, a mud layer and a heavy mud layer from top to bottom in the concentration and sedimentation process, as shown in fig. 2;
s4: a mud layer interface instrument 22 is arranged at the overflow weir position of the tailing thickener 3 and is used for detecting the interface distribution condition of the tailing concentration and sedimentation process in the tailing thickener 3 on line and feeding data back to a control center;
the mud layer interface instrument 22 can be installed at a position close to the overflow weir by 5 meters, the interface of the tailing thickener 3 measures the internal interface distribution condition of the tailing thickener 3 every 15 minutes, measurement data is fed back to the control center, the mud layer interface instrument 22 can accurately master the internal layered interface condition of the tailing thickener 3, the collected interface data is analyzed to obtain the operation trend of controlling the solid-liquid separation condition under different conditions, the intelligent monitoring of the concentration and sedimentation process of the tailing thickener 3 is realized through the control center, the good clear liquid overflow and the ore pulp with proper concentration in the tailing thickener 3 are realized, the running and muddy or harrowing of the tailing thickener 3 are avoided, and finally the highly clarified overflow backwater is obtained for production and recycling, and the production reduction or production stopping condition caused by the running muddy or harrowing accident is avoided.
S5: the underflow ore pulp in the tailing thickener 3 is conveyed into a ceramic filter 8 for filtering and dewatering through an underflow pump 5;
the underflow pump 5 is controlled by variable frequency, and according to the working state of the ceramic filter 8, the operating pressure of the tailing thickener 3, the concentration of underflow pulp and other data, the control center can automatically adjust the operating frequency of the underflow pump 5, so that the safe and stable operation of the flotation tailing dehydration is ensured;
s6: the tailing filtrate produced in the ceramic filter 8 enters a tailing filtrate pond 9, the produced tailing sand is conveyed to a tailing storage yard 19 for storage through a rubber belt conveyor 11, and the discharged material during the cleaning of the ceramic filter 8 is conveyed to a thickener degassing tank 26 through a conveying pump 21. The underflow ore pulp is filtered and dehydrated through the ceramic filter 8, so that slag tailings with the water content less than 12% can be produced.
The production condition of the ceramic filter 8 (the number of the starting machine of the ceramic filter 8, the tailing productivity and the like), the running pressure of the tailing thickener 3, the height of a harrow frame, the concentration of underflow pulp, the thickness of a supernatant layer and the like are transmitted to a control center in real time, and the control center can automatically adjust the addition amount of a flocculating agent of the mixing and conveying pump 18, the running frequency of the underflow pump 5 and the like, so that the safe and stable running of the dehydration of the flotation tailings is ensured.
In this embodiment, preferably, the tailings thickener 3 is provided with an operation pressure detecting device, a harrow frame height detecting device and an alarm device, and the operation pressure detecting device and the harrow frame height detecting device are used for detecting the operation pressure and the harrow frame height of the tailings thickener 3 in real time and feeding back data to the control center. The intelligent monitoring of the tailing thickening process is realized by adopting a loop control, interval control, abnormal condition control and alarm device, and the overflow of a good supernatant layer and underflow ore pulp with proper concentration are realized. In the normal range of the interval, different loops are adopted for respective control, and parameters among the loops are not related to each other; the parameters of the primary different loops participate in coordination control by adopting the control of a preset rule stage outside the normal range and within the limit range of the interval; alarming when the time limit is close to the high time limit and the low time limit; abnormal condition control is adopted outside the interval limiting range.
When the operation pressure of the tailing thickener 3 is more than 3.5MPa, the harrow frame in the tailing thickener 3 can be automatically lifted, and an alarm of the tailing thickener 3 can give an alarm at the moment; when the operation pressure of the tailing thickener 3 is greater than 6.3MPa, the overload protection in the tailing thickener 3 automatically jumps and stops, the harrow frame in the tailing thickener 3 automatically lifts to the highest position, and an alarm of the tailing thickener 3 alarms; when the operation pressure of the tailing thickener 3 is lower than 2.5MPa, the harrow frame in the tailing thickener 3 automatically descends, and the alarm of the tailing thickener 3 alarms.
In this embodiment, preferably, the flocculant in the flocculant bin 14 is lime, and the lime is mixed with water in the stirring barrel 16 to generate lime emulsion, and the lime can adjust the pH value of the water in the tailings, so that some heavy metal ions in the water can form a precipitate with the lime, which is difficult to dissolve. In addition, the lime can neutralize acidic substances in water, so that subsequent backwater recycling is facilitated, and subsequent treatment efficiency is improved. Lime can accelerate flocculation and sedimentation of tailings, and ensures clarification of water quality of overflow water in the tailings thickener 3.
In this embodiment, preferably, referring to fig. 1, a pneumatic control valve 24 and a flow meter 25 are installed on a water supply pipeline between the stirring tank 16 and the process backwater, and are respectively used for adjusting the water feeding amount entering the stirring tank 16 and measuring the flow rate of the water, and the ratio of water to flocculant, namely lime, is configured according to the concentration of 10%, and a flow meter 25 is also installed on a pipeline between the mixing and conveying pump 18 and the thickener degassing tank 26, and is used for measuring the flow rate of the mixed liquid.
In this embodiment, preferably, the stirring tank 16 is provided with a liquid level meter 17 for measuring the liquid level of the mixed liquid in the stirring tank 16 in real time, and the liquid level meter 17 is connected with a mixing and conveying pump 18 in a signal manner, so as to ensure that the amount of the mixed liquid added into the tailing thickener 3 is matched with the required configuration amount.
In this embodiment, preferably, referring to fig. 1, a tailing distributing tank 7 is disposed between the underflow pump 5 and the ceramic filter 8, and after the underflow pump 5 delivers the underflow pulp into the tailing distributing tank 7, the underflow pulp is distributed into the ceramic filter 8 through the tailing distributing tank 7.
In this embodiment, preferably, referring to fig. 1, a concentration meter 6 is installed on a conveying pipeline between the underflow pump 5 and the tailing distributing tank 7, and is used for measuring the conveying concentration of the underflow pulp in real time and feeding back data to a control center.
In this embodiment, preferably, the overflow water in the tailing thickener 3 flows out to the water return tank through the overflow weir for recycling.
In this embodiment, preferably, a part of the tailing filtrate in the tailing filtrate tank 9 enters the backwater tank for recycling, and the other part is conveyed to the ceramic filter 8 for backwashing by the flushing water pump 10, so that the reutilization rate of the tailing filtrate can be improved, and the waste is reduced.
In this embodiment, the belt conveyor 11 is preferably provided with an electronic belt scale 12 for measuring the output of the tailings on the belt conveyor 11.
The process backwater refers to the tailings filtrate in the tailings filtrate tank 9 entering the backwater tank and the overflow water in the tailings thickener 3 entering the backwater tank.
The intelligent monitoring of the tailing thickening process is realized by adopting a loop control, interval control, abnormal condition control and alarm device, and the overflow of a good supernatant layer and underflow ore pulp with proper concentration are realized. In the normal range of the interval, different loops are adopted for respective control, and parameters among the loops are not related to each other; the parameters of the primary different loops participate in coordination control by adopting the control of a preset rule stage outside the normal range and within the limit range of the interval; alarming when the time limit is close to the high time limit and the low time limit; abnormal condition control is adopted outside the interval limiting range.
The interval and standard parameters for setting the target value are shown in the following table:
| clear liquid layer m | Underflow ore pulp% | Operating pressure MPa | |
| Low limit of | 0.8 | 55 | 0.4 |
| Low point | 1.0 | 60 | 0.5 |
| Standard of | 1.5 | 65 | 2.5 |
| High point | 2.5 | 70 | 3.5 |
| High limit | 3.0 | 75 | 5.0 |
Referring to fig. 3, the lime addition control loop: when the clear liquid layer is in the low point and high point interval (not including the high and low points), the controller is adopted for control. The theoretical setting value of lime addition is a corresponding setting value of lime addition rate according to the dry ore feeding amount (dry ore feeding amount=grinding treatment amount×ore moisture×tailing yield). The PV1 value is the lime addition amount of the screw feeder 15, the OP1 value is the frequency control value of the screw feeder 15, the PV2 value is the amount of water to be disposed (PV 2 = 9PV 1) of the process return water added to the stirring tank 16, the PV3 value is the lime milk amount conveyed by the mixing conveyor pump 18, and the OP2 value is the frequency control value of the mixing conveyor pump 18. When the effect of adjusting the clear liquid layer is not good, the theoretical setting value of lime addition is increased or decreased by 0.1, but the limit value of lime addition cannot be exceeded, and the observation effect is waited for 15 to 20 minutes every time of change.
Interval control: when the clear liquid layer is smaller than or equal to the low point and larger than the low limit, the clear liquid layer jumps out of the controller loop, the lime adding amount is continuously and slightly increased on the basis of the original back, and the effect is checked every 15 minutes. When the clear liquid layer is smaller than the lower limit, on the basis of slightly increasing lime, the solid stock is reduced, the underflow ore pulp discharge is increased in stages, and the running and muddy state early warning is made according to the trend value obtained by data analysis. When the clear liquid layer is larger than the high point and smaller than the high limit, the clear liquid layer jumps out of the controller loop, the lime adding amount is continuously and slightly reduced on the basis of the original back, and the effect is checked every 15 minutes. When the clear liquid layer is larger than the upper limit, on the basis of reducing lime by a small margin, the solid stock is increased, and the discharge of the underflow ore pulp is reduced in stages.
And (3) controlling the concentration of the underflow ore pulp: by controlling the rotational speed of the underflow pump 5 to maintain a constant stock control, the stock set point is modified by adding the underflow pulp concentration control as feedback, and a stable, relatively high underflow pulp concentration is achieved within the limits of the tailings thickener 3 itself. Firstly, establishing a corresponding production steady state according to an underflow ore pulp concentration value actually set by production. The steady state of production is to realize that the solid stock is basically constant, the dry ore difference value (dry ore difference value=the ore quantity shown by the electronic belt scale 12. Average moisture content-ore feeding dry quantity) slightly fluctuates around 0, the clear liquid layer is stabilized in a normal interval, the mud layer is stabilized in a normal interval, the concentration of underflow ore pulp slightly fluctuates around a target value, and the concentration process is stabilized and consistent by controlling lime and the solid stock, so that the best is achieved. When the concentration of the underflow ore pulp is smaller, the speed of the underflow pump 5 is gradually reduced, the dry ore difference value is reduced, the retention time of the ore pulp in the tailing thickener 3 is prolonged, the concentration effect is enhanced, and feedback is observed after 10 minutes of operation until the operation is normal; and if the concentration of the underflow ore pulp is larger, the reverse operation is performed. The control of the supernatant layer is considered during operation, and generally, the thickness of the supernatant layer is increased when the dry ore difference value is increased, and the thickness of the supernatant layer is reduced when the dry ore difference value is reduced. An increase in lime addition accelerates the solid-liquid separation rate and also contributes to an increase in underflow concentration.
Referring to fig. 4-5, the supernatant layer is abnormal: after being treated by the lime adding control loop and the interval control flow, if the lime adding amount is still high for a long time, the clear liquid layer thickness is still at a low limit for a long time or continuously reduced, at the moment, the underflow ore pulp is discharged at a high speed in a short time, and meanwhile, an alarm prompts an operator to check whether the concentration degree of the tailings and the lime preparation condition are normal.
Operating pressure anomalies: when the operation pressure of the tailing thickener 3 reaches the high limit, the thickness of a mud layer needs to be reduced in time, and the phenomena of equipment damage and harrow pressing are prevented; when the operation pressure of the tailing thickener 3 reaches the lower limit, it is necessary to immediately check whether the hydraulic system of the tailing thickener 3 has hydraulic oil leakage or other equipment faults, and timely notify maintenance personnel of the presence of the maintenance personnel for more specialized checking and treatment.
Lifting the height of the harrow frame: when the harrow frame is lifted, the discharging of the underflow ore pulp needs to be increased in time, and the phenomena of equipment damage and harrow pressing are prevented.
After the control process is added through transformation, the on-site tailing production data is compared with the past and analyzed as follows:
| comparison item | Before transformation | After transformation | Standard of |
| Overflow water turbidity dB | Running mixing | ≤9 | ≤15 |
| Thickness of supernatant layer m | 1.0～2.5 | 2.0～2.5 | ≥1.5 |
| Concentration of underflow% | 55～75 | 65～70 | 55～75 |
| Thickener operating pressure MPa | 0.5～2.0 | 0.5～0.9 | ≤1.0 |
| Height cm of harrow frame | 0～20 | 0 | 0 |
| Time t/h of tailing pond | 100～170 | ≥200 | ≥180 |
| Moisture of the filter tailings | ≥12 | ≤12 | ≤13 |
The overflow water of the modified tailing thickener 3 has good clarification effect, and no mixing phenomenon occurs; the thickness of the supernatant layer in the tailing thickener 3 is relatively stable and is not much different from the manual measurement result.
The modified tailing thickener 3 runs in a low-pressure (less than or equal to 1.0 MPa) state for a long time, and the harrow frame is basically at the lowest position, which indicates that the solid stock in the tailing thickener 3 is relatively low, and the safe and stable running of the tailing thickener 3 can be ensured.
The concentration of the bottom flow ore pulp after transformation can be relatively stable, which is beneficial to keeping the stable operation of tailing dehydration (filtration).
The time of the tailing pond after transformation is obviously improved, and the water content of the filtered product is lower. The tailings are filtered with large water content before transformation, ore stacking is easy to occur in the discharging hopper of the ceramic filter 8, a large number of accidents of plate explosion of the ceramic plates of the ceramic filter 8 can be caused by untimely adjustment, the labor intensity of the workers for poking the ores is very high, each ceramic filter 8 needs to be poked by one person at any time, time and labor are wasted, and the production efficiency is low; the water content of the tailings after transformation is basically controlled within 12%, the stacking phenomenon is improved, only the discharging hopper of the ceramic filter is needed to be checked regularly, and the accumulated ore is needed to be cleaned basically once per shift, so that more labor force is saved, and the production efficiency is greatly improved.
It should be understood that the examples and embodiments described herein are for illustrative purposes only and are not intended to limit the present invention, and that various modifications or changes in light thereof will be suggested to persons skilled in the art and are to be included within the spirit and purview of this application.
It should be noted that, in the embodiment of the present invention, directional indications such as up, down, left, right, front, and rear … … are referred to, and the directional indication is merely used to explain the relative positional relationship, movement conditions, and the like between the components in a specific posture such as that shown in the drawings, and if the specific posture is changed, the directional indication is changed accordingly.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, "a plurality of" means two or more. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
Claims (10)
1. The method for concentrating and dehydrating the copper smelting slag flotation tailings is characterized by comprising the following steps of:
s1: the flotation tailings are conveyed to a thickener degassing tank (26) through a tailings conveying pump (2);
s2: the flocculant in the flocculant bin (14) is conveyed into a stirring barrel (16) through a screw feeder (15), and process backwater is added into the stirring barrel (16) so that the flocculant and water are mixed to generate mixed liquid;
s3: the mixed liquor is conveyed into a degassing tank (26) of the thickener through a mixing conveying pump (18) to be fully mixed with flotation tailings in the degassing tank, and the mixed liquor is fed into a tailings thickener (3);
s4: a mud layer interface instrument (22) is arranged at the overflow weir position of the tailing thickener (3) and is used for detecting the interface distribution condition of the tailing concentration sedimentation process in the tailing thickener (3) on line and feeding data back to a control center;
s5: the underflow ore pulp in the tailing thickener (3) is conveyed into a ceramic filter (8) through an underflow pump (5) for filtering and dewatering;
s6: tailing filtrate produced in the ceramic filter (8) enters a tailing filtrate tank (9), produced slag tailings are conveyed to a tailing storage yard (19) for storage through a rubber belt conveyor (11), and discharged materials during cleaning of the ceramic filter (8) are conveyed to a thickener degassing tank (26) through a mineral discharge conveying pump (21).
2. The copper smelting slag flotation tailing pond concentration dehydration method according to claim 1, wherein the tailing pond concentration machine (3) is provided with an operation pressure detection device, a harrow frame height detection device and an alarm device, and the operation pressure device and the harrow frame height detection device are used for detecting the operation pressure and the harrow frame height of the tailing pond concentration machine (3) in real time and feeding data back to a control center.
3. The method for dense dewatering copper smelting slag flotation tailings as claimed in claim 1, wherein the flocculant in the flocculant bin (14) is lime, and the lime emulsion is produced by mixing the flocculant with water in the stirring barrel (16).
4. The method for concentrating and dehydrating copper smelting slag flotation tailings according to claim 1, wherein a pneumatic adjusting valve (24) and a flowmeter (25) are arranged on a water supply pipeline between the stirring barrel (16) and process backwater and are respectively used for adjusting the water feeding amount entering the stirring barrel (16) and measuring the water feeding flow rate, and a flowmeter (25) is also arranged on a pipeline between the mixing conveying pump (18) and the thickener deaeration tank (26) and is used for measuring the flow rate of mixed liquor.
5. The method for dense dehydration of copper smelting slag flotation tailings according to claim 1, wherein a liquid level meter (17) is arranged on the stirring barrel (16) and is used for measuring the liquid level of mixed liquid in the stirring barrel (16) in real time, and the liquid level meter (17) is in signal connection with the mixed conveying pump (18).
6. A copper smelting slag flotation tailings pond concentration dewatering process according to claim 1, wherein a tailings distributing tank (7) is arranged between the underflow pump (5) and the ceramic filter (8), and the underflow pump (5) delivers underflow pulp into the tailings distributing tank (7) and distributes the underflow pulp into the ceramic filter (8) through the tailings distributing tank (7).
7. The method for dense dehydration of copper smelting slag flotation tailings in accordance with claim 6, wherein a concentration meter (6) is installed on a conveying pipeline between the underflow pump (5) and the tailings distributing tank (7) for measuring the conveying concentration of underflow ore pulp in real time and feeding data back to a control center.
8. The method for concentrating and dehydrating copper smelting slag flotation tailings, as claimed in claim 1, is characterized in that overflow water in the tailings thickener (3) flows out to a water return tank through the overflow weir for recycling.
9. The method for concentrating and dehydrating copper smelting slag flotation tailings, as claimed in claim 8, is characterized in that a part of tailings filtrate in the tailings filtrate tank (9) enters the water return tank for recycling, and the other part is conveyed to the ceramic filter (8) for back flushing through a flushing water pump (10).
10. The method for dense dewatering of copper smelting slag flotation tailings as claimed in claim 1, wherein an electronic belt scale (12) is arranged on the belt conveyor (11) for measuring the output of slag tailings on the belt conveyor (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311668908.5A CN117654121A (en) | 2023-12-05 | 2023-12-05 | Dense dehydration method for copper smelting slag flotation tailings |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311668908.5A CN117654121A (en) | 2023-12-05 | 2023-12-05 | Dense dehydration method for copper smelting slag flotation tailings |
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| CN117654121A true CN117654121A (en) | 2024-03-08 |
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| CN202311668908.5A Pending CN117654121A (en) | 2023-12-05 | 2023-12-05 | Dense dehydration method for copper smelting slag flotation tailings |
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| Country | Link |
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| CN (1) | CN117654121A (en) |
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2023
- 2023-12-05 CN CN202311668908.5A patent/CN117654121A/en active Pending
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