CN112343652A - Equipment and method for adjusting continuous concentration of low-concentration tailings and intermittent filling of high-concentration slurry - Google Patents
Equipment and method for adjusting continuous concentration of low-concentration tailings and intermittent filling of high-concentration slurry Download PDFInfo
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- 239000002002 slurry Substances 0.000 title claims abstract description 108
- 238000000034 method Methods 0.000 title claims description 17
- 239000004576 sand Substances 0.000 claims abstract description 157
- 239000002562 thickening agent Substances 0.000 claims abstract description 98
- 239000000463 material Substances 0.000 claims abstract description 31
- 238000003756 stirring Methods 0.000 claims abstract description 22
- 239000004570 mortar (masonry) Substances 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000003860 storage Methods 0.000 claims description 11
- 239000008394 flocculating agent Substances 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 229920002401 polyacrylamide Polymers 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 abstract description 10
- 238000003825 pressing Methods 0.000 abstract description 5
- 238000012423 maintenance Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000005429 filling process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/005—Methods or devices for placing filling-up materials in underground workings characterised by the kind or composition of the backfilling material
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Abstract
The invention discloses equipment for adjusting continuous concentration of low-concentration tailings and intermittent filling of high-concentration slurry, which comprises a thickener and a vertical sand silo, wherein the thickener is arranged in the vertical sand silo; the bottom end of the thickener is connected with the top end of the vertical sand silo, and the bottom end of the vertical sand silo is provided with a discharge hole for conveying the tailings to the stirring device; a thickener underflow thickener pump, a flowmeter I and a densimeter I are sequentially arranged between the thickener and the vertical sand silo; a sand silo material level meter is arranged at the top end of the vertical sand silo, and a sand silo overflow pipe is arranged on the side wall of the upper end of the vertical sand silo; a sand silo underflow slurry pump, a second flowmeter and a second densimeter are sequentially arranged between the vertical sand silo discharge port and the stirring device. The invention has reasonable unit time treatment capacity, equipment type selection and quantity configuration, and minimizes equipment investment; the feeding and discharging are stable and balanced, the equipment performance of the thickener can be fully exerted, rake pressing accidents are prevented, the service life of the equipment is maintained, and the maintenance cost is reduced.
Description
Technical Field
The invention relates to the technical field of filling slurry, in particular to equipment and a method for adjusting continuous concentration of low-concentration tailings and intermittent filling of high-concentration slurry.
Background
In the field of metal mine full-tailing filling, as full-tailing grade compositions become increasingly thinner, low-cost, efficient and reliable concentration of full-tailing mortar becomes a key technology. The tailing treatment efficiency is improved day by developing from an initial horizontal sand silo to a vertical sand silo and then to a deep cone paste thickener, and the requirement of filling the tailing is basically met.
However, with such changes, some problems are caused, only a part of tailings produced by the selecting plant is used for filling operation, and the rest of tailings needs to be discharged to an approved tailings pond or other facilities. Meanwhile, in order to reduce the operation cost, the filling workshop often works from one shift to two shifts. This results in the dry amount of tailings required per unit time to fill being greater than the sand supply per unit time of the upstream concentrating equipment, although the sand supply per day to the mill is much greater than the sand demand per day to fill. Therefore, the contradiction between the supply and demand of the tailings caused by the different working systems of the ore dressing process and the filling process becomes a troublesome problem for the ore enterprises.
To the above-mentioned problem, the current solution thinking mainly has two: one method is to improve the specification of the tailing concentrating equipment, namely 1 tailing concentrating equipment with the treatment scale capable of meeting the unit demand is built, and the feeding and the discharging of the thickener are relatively balanced and stable. The tailings directly enter a filling process during filling, and are discharged to a tailing pond or other places when the filling is not needed; of course, at the prior art level and the manufacturing cost, when the research and development and the manufacturing of a single device with large processing capacity are difficult, only 2 or more devices can be built to achieve the corresponding target.
The other method is to build the thickener with the original quantity and add a material storage function for a certain time, namely the tailings can be stored for a certain time in the thickener equipment under the condition of continuous feeding without discharging, so as to match with the filling operation time difference. Before filling operation, the tailing slurry can only be fed in but not discharged, and the material level is continuously increased on the basis of stabilizing the material level; when filling is started, the discharge amount of the underflow is greater than the sand inlet amount, the sand level in the thickener is continuously reduced until the lowest material level of the stable discharge of the thickener, and the steps are repeated.
The former increases the specification of the thickener, so the cost of each item can be greatly increased, and even more, the large-scale treatment capacity can not be completed by 1 device under the prior art, and only incremental construction can be realized, namely 2 or more devices are built, the total investment of the project is greatly increased, and the thickener is not necessarily suitable for the conditions of all mine enterprises; the thickener adopted by the latter greatly increases the height of the pool body on the basis of unchanged diameter, not only increases material cost and processing cost, but also increases the required driving torque along with the increase of the height, greatly increases the purchase cost of key parts, more importantly, the most suitable working condition of the thickener is inlet and outlet balance, and after the storage function is increased, the working condition of the equipment is changed all the time, greatly influences the service life of the equipment, and increases the rake pressing probability and the field operation difficulty.
Therefore, it is an urgent technical problem for those skilled in the art to provide an economical and efficient apparatus for adjusting continuous concentration of low-concentration tailings and intermittent filling of high-concentration slurry, which can reasonably solve the contradiction between supply and demand of tailings caused by different working systems of the concentrating step and the filling step.
Disclosure of Invention
In view of the above, the invention provides a tailing preparation and storage process combining a tailing thickener and a vertical tailing bin, which can reliably, economically and reasonably coordinate the contradiction between tailing dewatering capacity and filling preparation capacity.
In order to achieve the purpose, the invention adopts the following technical scheme:
an apparatus for regulating continuous concentration of low-concentration tailings and intermittent filling of high-concentration slurry, comprising: a thickener and a vertical sand silo;
the bottom end of the thickener is connected with the top end of the vertical sand silo, and a discharge hole for conveying tailings to the stirring device is formed in the bottom end of the vertical sand silo;
a bottom flow thick slurry pump of the thickener is arranged between the thickener and the vertical sand silo;
a sand silo material level meter is arranged at the top end of the vertical sand silo, and a sand silo overflow pipe is arranged on the side wall of the vertical sand silo;
a sand silo underflow slurry pump is arranged between the vertical sand silo discharge port and the stirring device.
Preferably, the thickener is a deep cone thickener with the model of HD-PT.
Preferably, the bottom flow underflow slurry pump of the thickener is provided with a plurality of bottom flow slurry pumps, and the bottom flow slurry pumps of the thickener are arranged in parallel.
More preferably, a manual valve at the bottom of the thickener and an electric valve in front of the underflow thick slurry pump of the thickener are sequentially arranged between the thickener and the underflow thick slurry pump of the thickener; and a rear electric valve of the thickener underflow slurry pump is arranged between the thickener underflow slurry pump and the first flowmeter.
The preferable beneficial effects are as follows: the underflow of the thickener can be conveniently conveyed to the vertical sand silo through the combination of an electric valve and an underflow conveying pump. When conditions allow, the vertical sand silo underflow can convey high-concentration slurry to a downstream filling slurry preparation system by adjusting the opening of the electric valve; when the on-way resistance of the pipeline is large, the pipeline can also be conveyed to the stirring system through a combination of an electric valve and an underflow conveying pump. The material level indicator arranged at the top of the vertical sand silo can accurately reflect the material storage condition inside the sand silo, and is convenient for material monitoring.
Preferably, a first flowmeter and a first densimeter are sequentially arranged between the underflow slurry pump and the vertical sand silo of the thickener;
and a second flowmeter and a second densimeter are sequentially arranged between the vertical sand silo underflow slurry pump and the stirring device.
Preferably, a plurality of sand silo bottom electric valves are arranged between the sand silo discharge port and the second flowmeter and are connected in series; a plurality of sand silo bottom electric valve with sand silo underflow slurry pump connects the setting in parallel.
More preferably, an electric valve in front of the sand silo underflow slurry pump is arranged between the sand silo discharge port and the sand silo underflow slurry pump; and a rear electric valve of the sand silo underflow slurry pump is arranged between the sand silo underflow slurry pump and the second flowmeter.
The preferable beneficial effects are as follows: the flow meters and the concentration meters are arranged on the thickener and the sand bin discharge pipe, so that the flow and the concentration of the underflow of the thickener and the underflow of the sand bin can be detected, and the quality of the material discharged by equipment can meet the design requirement; meanwhile, data can be transmitted to a matched automatic system, and feeding and underflow discharge can be monitored and controlled in real time by setting the opening degree of each electric valve and the working frequency of the thick slurry pump.
Preferably, a manual valve at the bottom of the sand bin is arranged at the discharge port of the sand bin.
The preferable beneficial effects are as follows: when the latter electric valve fails and cannot be closed smoothly, the manual valve can be closed, the latter electric valve can be maintained, and the valve maintenance can be completed only by discharging all materials in the bin.
The invention also provides a method for adjusting the continuous concentration of low-concentration tailings and the intermittent filling of high-concentration slurry by adopting the equipment, which comprises the following steps:
(1) automatically flowing or pumping the low-concentration tail mortar into a thickener, adding a flocculating agent, concentrating the low-concentration tail mortar by the thickener under the coordination of the flocculating agent, wherein the upper part of the tail mortar is clear overflow water, and the underflow of the tail mortar generates high-concentration tail mortar for filling;
(2) when in non-filling operation, the slurry is conveyed to the vertical sand silo for temporary storage through a underflow slurry pump of the thickener;
(3) during filling operation, a manual valve at the bottom of the thickener is switched, and the high-concentration tail mortar is directly conveyed to a stirring system; meanwhile, a manual valve at the bottom of the sand silo of the vertical sand silo is opened, and the sand is synchronously conveyed to the stirring system.
Further, the flocculating agent is high-molecular polyacrylamide with the mass concentration of 0.25-1 per mill;
the invention mainly comprises 2 key devices of an HD-PT deep cone thickener and a vertical tail sand silo, and a matched underflow slurry pump, a pipeline, a valve, an instrument and the like.
The whole tailings are continuously conveyed to a deep cone thickener in a filling station, and the amount of the partial tailings is suitable to be matched with the daily average filling amount of the tailings. After the tailings enter a deep cone thickener and are subjected to flocculation sedimentation, overflow clear water returns to a high-level water pool for recycling, and underflow tailings paste meeting the filling quality and concentration requirements is continuously discharged to a vertical sand silo. The thickener has the advantages of continuous feeding and discharging, stable material level, controllable working condition and simple operation.
And conveying the bottom flow tailing slurry of the thickener to a vertical sand silo through a bottom flow thickening slurry pump of the thickener, and continuously increasing the material level until the designed material level is met. When filling operation is carried out, the electric valve of the sand silo underflow slurry pump at the bottom of the sand silo is opened, slurry is discharged to the slurry preparation system, and the slurry is fully stirred with cementing materials such as cement and the like and then is used for filling the goaf. At the moment, the sand discharging amount of the bottom flow of the sand bin is larger than the sand feeding amount of the sand bin (namely the bottom flow discharging amount of the thickener), the material level in the sand bin is continuously reduced until the lowest material level, and the filling is finished.
In the process, the vertical sand silo adjusts the difference value between the underflow of the thickener and the tailing needed by filling through the capacity of the vertical sand silo, the thickener continuously and stably operates, and the thickener and the tailing play the characteristics of all devices to realize the aim of continuous and stable filling.
After filling is finished, the underflow of the thickener is still continuously injected into the tail sand bin for temporary storage, and filling is carried out again after the material level is reached.
A sand silo material level meter is arranged at the top of the sand silo to monitor the material level in the silo in real time; in order to prevent the possible material accumulation condition, the bottom of the sand silo can be provided with a plurality of rings of circular pipes, and the air pressing, water pressing or air and water linkage slurry making and discharging can be selected.
The invention relates to a sand silo effective capacity calculation method which comprises the following steps: taking a filling period as a calculation interval, usually one day, calculating the amount of tailings required by filling in the time range, counting the total amount of tailings produced by selecting plants in the corresponding filling operation time, calculating the difference value of the tailings and the total amount of tailings, calculating according to the following formula, and designing a sand silo according to the difference value:
V＝M/γ＝(Q1-Q2)*t/C/γ
in the formula: v is the effective volume of the sand silo, m3(ii) a M is the total mass of the slurry, t; gamma is the weight of the slurry, t/m3；Q1T/h for filling the required amount of the tail sand; q2The amount of tail sand discharged from the bottom flow of the thickener is t/h; t is effective filling operation time h; c is the mass concentration of the slurry,%.
The invention has the beneficial effects that: 1. the invention has the advantages of smoother process flow, less investment, lower operation cost, simpler operation of workers and higher system reliability.
2. The thickener has reasonable unit time treatment capacity, equipment type selection and quantity configuration, and minimizes equipment investment; the feeding and discharging are stable and balanced, the equipment performance of the thickener can be fully exerted, rake pressing accidents are prevented, the service life of the equipment is maintained, and the maintenance cost is reduced.
3. In the practical application process, when the sand silo is full and cannot be filled in time, the limited material storage function of the thickener can be utilized for short-term adjustment, so that the reliability of the system is improved.
4. The vertical sand silo only has the sand storage function, so that the technical requirement is lower, and the equipment investment is greatly reduced;
(1) the tailings entering the sand silo are slurry with the mass concentration meeting the filling requirement, concentration and sedimentation are not needed, the effective utilization coefficient is greatly increased, namely the size of the sand silo is smaller, and the investment is saved;
(2) the concentrated paste tail mortar is easier to discharge sand from the vertical sand silo, has no high requirement on the slurry making function at the bottom of the sand silo, and the slurry making system is only configured for preventing the accidental sand discharge difficulty with small probability.
(3) The sand silo is filled with homogeneous paste slurry, a solid-liquid mud layer interface instrument is not needed, and the purchase cost of the material level detection instrument is reduced.
(4) The bin is filled with homogeneous paste slurry, so that water does not need to be discharged; the bin material is measured by the level meter, so that the sand bin material is prevented from overflowing, and accessories such as overflow chutes, overflow pipelines and the like are not needed.
Drawings
FIG. 1 is a schematic structural diagram of the equipment for continuously concentrating low-concentration tailings and intermittently filling high-concentration slurry according to the present invention;
FIG. 2 is a process flow chart of the method for continuously concentrating low-concentration tailings and discontinuously filling high-concentration slurry.
In the drawings, the structures represented by the reference numerals are listed below: 1. a thickener; 2. a vertical sand silo; 3. a bottom flow thick slurry pump of the thickener; 4. a sand silo underflow slurry pump; 5. a sand silo material level meter; 6. a first flowmeter; 7. a first concentration meter; 8. a manual valve at the bottom of the thickener; 9. an electric valve in front of a thickener underflow thick slurry pump; 10. a valve is electrically operated behind a thickener underflow pump; 11. a manual valve is arranged at the bottom of the sand silo; 12. an electric valve is arranged at the bottom of the sand silo; 13. an electric valve in front of the sand silo underflow thick slurry pump; 14. a valve is electrically operated behind the sand silo underflow slurry pump; 15. an overflow pipe of the sand silo; 16. a second flowmeter; 17. and a second concentration meter.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Example 1
An apparatus for regulating continuous concentration of low-concentration tailings and intermittent filling of high-concentration slurry, comprising: a thickener 1 and a vertical sand silo 2;
the bottom end of the thickener 1 is connected with the top end of the vertical sand silo 2, and the bottom end of the vertical sand silo 2 is provided with a discharge hole for conveying tailings to the stirring device;
a thickener underflow slurry pump 3 is arranged between the thickener 1 and the vertical sand silo 2;
a sand silo material level meter 5 is arranged at the top end of the vertical sand silo 2, and a sand silo overflow pipe 15 is arranged on the side wall of the vertical sand silo 2;
a sand silo underflow slurry pump 4 is arranged between the discharge hole of the vertical sand silo 2 and the stirring device.
In one embodiment, the thickener underflow slurry pump 3 is provided in plurality, and a plurality of thickener underflow slurry pumps 3 are provided in parallel.
In one embodiment, a flow meter I6 and a consistency meter I7 are sequentially arranged between the underflow thickening pump and the vertical sand silo of the thickener;
a second flowmeter 16 and a second densimeter 17 are sequentially arranged between the vertical sand silo underflow slurry pump 4 and the stirring device.
In another embodiment, a bottom manual valve 8 of the thickener and a front electric valve 9 of the underflow thickener slurry pump are sequentially arranged between the thickener 1 and the underflow thickener pump 3; a rear electric valve 10 of the thickener underflow slurry pump is arranged between the thickener underflow slurry pump 3 and the flowmeter I6.
In one embodiment, a plurality of sand silo bottom electric valves 12 are arranged between the sand silo discharge port and the second flowmeter 16, and the plurality of sand silo bottom electric valves 12 are connected in series; a plurality of sand silo bottom electric valves 12 are arranged in parallel with the sand silo underflow slurry pump 4.
In another embodiment, an electric valve 13 in front of the sand silo underflow slurry pump is arranged between the discharge hole of the sand silo 2 and the sand silo underflow slurry pump 4; a post-mortar-chamber underflow slurry pump electric valve 14 is arranged between the mortar-chamber underflow slurry pump 4 and the second flowmeter 16.
In one embodiment, a manual valve 11 at the bottom of the sand silo is arranged at the discharge port of the sand silo 2.
The use method of the device for adjusting the continuous concentration of the low-concentration tailings and the intermittent filling of the high-concentration slurry comprises the following steps:
(1) automatically flowing or pumping the low-concentration tail mortar into a thickener, adding a macromolecular polyacrylamide flocculant with the mass concentration of 0.3 per mill, concentrating by the thickener under the coordination of the flocculant, wherein the upper part is clear overflow water, and the underflow produces the high-concentration tail mortar for filling; the flocculant is a model A5005 flocculant of Beijing Schitao.
(2) When in non-filling operation, the slurry is conveyed to the vertical sand silo for temporary storage through a underflow slurry pump of the thickener;
(3) during filling operation, a manual valve at the bottom of the thickener is switched, and the high-concentration tail mortar is directly conveyed to a stirring system; meanwhile, a manual valve at the bottom of the sand silo of the vertical sand silo is opened, and the sand is synchronously conveyed to the stirring system.
The tail mortar with the concentration of 35% in a concentrating mill is concentrated to the concentration of more than 66% by a deep cone thickener 1 with the diameter of 20m, valves 8, 9 and 10 are kept opened, the tail mortar is sent to a filling standing type tail sand silo 2 through a thick slurry pump 3 for storage and standby, a manual valve 11 at the bottom of the sand silo is opened during filling, and the tail mortar is conveyed to a stirring system through a slurry pump 4 at the bottom of the sand silo or by gravity flow. 2, weighing and conveying cement in a 700t cement bin to a stirring system by a micro powder scale; the two kinds of water are mixed together in a stirring system and conveyed to the goaf for filling.
The thickener discharge pipeline and the sand silo sand discharge pipeline are sequentially provided with a flowmeter 6, a densimeter 7, a flowmeter 16 and a densimeter 17 for index monitoring.
Capacity calculation
The daily tailing amount of the system is 4200t/d (175t/h), and the daily filling is 4866.7m3/d(300m3And h), the tailing consumption is 260t/h, and the daily filling is 16 h. At this time, the contradiction between the continuous concentration of the low-concentration tailings and the intermittent filling of the high-concentration slurry exists, and the tailings are required to be supplemented for 85 t/h.
The amount of tailings to be supplemented is 85t/h multiplied by 16h which is 1360t according to 1.265t/m by taking one day as a period3The density of the slurry is 1075m, the effective capacity of the required sand silo3According to the effective coefficient of 0.85, the geometric capacity of the tailing bin is required to be larger than 1265m3. According to the principle of large and small, the sand silo is designed to have the diameter of 10m, the barrel body height of 15.9m and the total capacity of 1380m3Therefore, the thickener can continuously run for feeding when not being filled, and the consumption of the filling tailings in the next period can be ensured.
Sand silo arrangement
In order to prevent unsmooth discharging caused by long-time placement of the sand silo in a non-working or accident state, the wind-water linkage slurry making device is arranged on the silo bottom conical plate, and the tail sand at the silo bottom is fluidized into slurry to flow out through high-pressure water and high-pressure wind.
Although no overflow water is generated during normal work, the overflow pipe can be arranged on the top of the bin in consideration of special conditions, so that safety and environmental protection accidents are prevented.
The distance between the sand bin and the deep cone thickener is increased as much as possible, so that the conditions that the curvature radius of the bent pipe of the conveying pipeline is too small and the conveying resistance is too large are avoided.
When the sand silo is filled with tailings, the discharge amount is larger than the feed amount, the liquid level descends quickly, and after the liquid level descends to a certain height, the conveying double line can be increased to the extent that high-concentration slurry cannot be conveyed by self-flow. Therefore, a thick slurry pump is arranged at the bottom of the sand silo. When the slurry in the bin cannot be automatically conveyed due to too low vertical pressure, the slurry can be conveyed to a stirring system by adopting pump pressure.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example" or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (9)
1. An apparatus for regulating continuous concentration of low-concentration tailings and discontinuous filling of high-concentration slurry, comprising: a thickener and a vertical sand silo;
the bottom end of the thickener is connected with the top end of the vertical sand silo, and a discharge hole for conveying tailings to the stirring device is formed in the bottom end of the vertical sand silo;
a bottom flow thick slurry pump of the thickener is arranged between the thickener and the vertical sand silo;
a sand silo material level meter is arranged at the top end of the vertical sand silo, and a sand silo overflow pipe is arranged on the side wall of the vertical sand silo;
a sand silo underflow slurry pump is arranged between the vertical sand silo discharge port and the stirring device.
2. The apparatus for adjusting the continuous concentration of low-concentration tailings and the intermittent filling of high-concentration slurry according to claim 1, wherein a plurality of thickener underflow slurry pumps are arranged, and a plurality of thickener underflow slurry pumps are arranged in parallel.
3. The equipment for adjusting the continuous concentration of the low-concentration tailings and the intermittent filling of the high-concentration slurry according to claim 2, wherein a first flow meter and a first concentration meter are sequentially arranged between a bottom flow slurry pump and a vertical sand silo of the thickener;
and a second flowmeter and a second densimeter are sequentially arranged between the vertical sand silo underflow slurry pump and the stirring device.
4. The device for adjusting the continuous concentration of the low-concentration tailings and the intermittent filling of the high-concentration slurry according to claim 3, wherein a manual valve at the bottom of the thickener and an electric valve in front of a underflow slurry pump of the thickener are sequentially arranged between the thickener and the underflow slurry pump of the thickener;
and a rear electric valve of the thickener underflow slurry pump is arranged between the thickener underflow slurry pump and the first flowmeter.
5. The equipment for adjusting the continuous concentration of the low-concentration tailings and the intermittent filling of the high-concentration slurry according to claim 4, wherein a plurality of sand silo bottom electric valves are arranged between the sand silo discharge port and the second flowmeter and are connected in series;
a plurality of sand silo bottom electric valve with sand silo underflow slurry pump connects the setting in parallel.
6. The device for adjusting the continuous concentration of the low-concentration tailings and the intermittent filling of the high-concentration slurry according to claim 5, wherein an electric valve in front of a sand silo underflow slurry pump is arranged between the sand silo discharge port and the sand silo underflow slurry pump; and a rear electric valve of the sand silo underflow slurry pump is arranged between the sand silo underflow slurry pump and the second flowmeter.
7. The apparatus for regulating the continuous concentration of low-concentration tailings and the intermittent filling of high-concentration slurry according to claim 1, wherein a manual valve at the bottom of the sand silo is arranged at the discharge port of the sand silo.
8. A method for adjusting the continuous concentration of low-concentration tailings and the intermittent filling of high-concentration slurry, which is characterized by adopting the device for adjusting the continuous concentration of low-concentration tailings and the intermittent filling of high-concentration slurry as claimed in any one of claims 1 to 7;
the method comprises the following steps:
(1) automatically flowing or pumping the low-concentration tail mortar into a thickener, adding a flocculating agent, concentrating the low-concentration tail mortar by the thickener under the coordination of the flocculating agent, wherein the upper part of the tail mortar is clear overflow water, and the underflow of the tail mortar generates high-concentration tail mortar for filling;
(2) when in non-filling operation, the slurry is conveyed to the vertical sand silo for temporary storage through a underflow slurry pump of the thickener;
(3) during filling operation, a manual valve at the bottom of the thickener is switched, and the high-concentration tail mortar is directly conveyed to a stirring system; meanwhile, a manual valve at the bottom of the sand silo of the vertical sand silo is opened, and the sand is synchronously conveyed to the stirring system.
9. The method for adjusting the continuous concentration of the low-concentration tailings and the intermittent filling of the high-concentration slurry according to claim 8, wherein the flocculant is high-molecular polyacrylamide with a mass concentration of 0.25-1% o.
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