CN104941262B - Thickener and bottom flow circulating system thereof - Google Patents

Abstract

The invention discloses an underflow circulation system of a thickener, which comprises a thickening pool and an underflow cylinder arranged at the bottom of the thickening pool, and also includes an underflow circulation pump and an underflow discharge pump; the inlet I of the underflow circulation pump is connected to the underflow The outlet I is connected with the thickening tank, the inlet II of the underflow discharge pump is connected with the underflow cylinder, and the outlet II is connected with the slurry discharge pipeline. The bottom flow circulation system of the thickener disclosed in the present invention, through the action of the bottom flow circulation pump, makes the ore slurry flow out of the bottom flow cylinder into the bottom flow circulation pump, and then flows back into the thickening tank from the bottom flow circulation pump, so that the storage The ore pulp at the bottom of the thickener is forced to circulate, which effectively prevents the thickener from being pressed or stuck, so that the thickener with the underflow circulation system has the functions of preparation and storage at the same time; in addition, the pulp with a qualified concentration can also pass through the slurry discharge pipeline. Ejected smoothly. The invention also discloses a thickener comprising the above-mentioned underflow circulation system.

Description

A thickener and its underflow circulation system

technical field

The invention relates to the technical field of engineering material preparation technology, in particular to an underflow circulation system of a thickener. The present invention also relates to a thickener comprising the above-mentioned underflow circulation system.

Background technique

With the modernization of Chinese cities, buildings with reinforced concrete structures have long been common. Accompanied by this, the preparation technology of building materials is becoming more and more mature, and thickeners are needed at the head end of the technology chain.

Thickener is a solid-liquid separation equipment based on gravity sedimentation, which is mainly used in mineral processing, chemical industry, coal washing, wastewater treatment and other fields. The thickener is the main equipment for thickening the pulp. It is generally used for thickening the concentrate before filtering or for tailings dehydration. The purpose is to provide the pulp with a qualified concentration for the subsequent process to meet the production needs.

At present, materials are generally not stored in the thickener, but the pulp with qualified concentration is transported to the subsequent process through the underflow delivery pump in real time. When the subsequent technological process does not require underflow pulp, it is necessary to stop the pulp preparation of the thickener immediately, otherwise the pulp stored in the thickener for a long time will cause raking or jamming. When the follow-up process needs pulp with qualified concentration again, it is necessary to restart the thickener and wait for a period of time to prepare pulp with qualified concentration, which is not conducive to the continuous production of the material preparation process.

Contents of the invention

The purpose of the present invention is to provide an underflow circulation system of a thickener, which can make the slurry deposited at the bottom of the thickener perform forced circulation, and prevent the thickener from being pressed or stuck after the thickener is stored. Another object of the present invention is to provide a thickener comprising the above-mentioned underflow circulation system.

In order to solve the above technical problems, the present invention provides an underflow circulation system of a thickener, which includes a thickening tank and an underflow cylinder arranged at the bottom of the thickening tank, and also includes an underflow circulation pump and an underflow discharge pump; the inlet of the underflow circulation pump I is connected to the underflow cylinder, the outlet I is connected to the thickening tank, the inlet II of the underflow discharge pump is connected to the underflow cylinder, and the outlet II is connected to the slurry discharge pipeline.

Preferably, a riser is provided on the outer wall of the thickening tank, the outlet I of the underflow circulation pump is connected to the inlet of the riser, and the outlet of the riser is connected to the thickening tank.

Preferably, the standpipe is arranged on the outer wall of the thickening tank parallel to the axial direction of the thickening tank.

Preferably, a ring pipe is arranged around the thickening tank in the circumferential direction, and the outlet of the ring pipe is connected to the thickening tank; the standpipe communicates with the ring pipe through a first three-way pipe.

Preferably, a second three-way pipe is also included, and the slurry discharge pipeline communicates with the annular pipe through the second three-way pipe.

Preferably, the position of the outlet of the standpipe and the position of the outlet of the annular pipe are staggered in the circumferential direction.

Preferably, the position of the outlet of the standpipe and the position of the outlet of the ring pipe form an included angle of 30°-180° in the circumferential direction.

Preferably, it also includes a first control valve arranged on the slurry discharge pipeline for opening or closing the slurry discharge pipeline.

Preferably, it also includes a second control valve disposed on the standpipe for opening or closing the standpipe.

Preferably, it also includes a third control valve disposed on the annular pipe at one interface of the first three-way pipe and a fourth control valve located at the other interface of the first three-way pipe.

Preferably, it also includes a fifth control valve located on the left end of the second three-way pipe and a sixth control valve located on the right end of the second three-way pipe, which are arranged on the annular pipe.

Preferably, a suction pipe is provided at the inlet I of the underflow circulation pump and the inlet II of the underflow discharge pump.

Preferably, a discharge pipe is provided at the outlet of the standpipe and the outlet of the annular pipe.

Preferably, the inlet II of the underflow discharge pump is also provided with a flushing pipe for dredging when the pipe is blocked.

Preferably, the underflow cylinder is provided with a reserved interface for auxiliary discharge.

Preferably, the riser is provided with a sampling port for sampling the slurry.

Preferably, the standpipe or the annular pipe or the underflow cylinder is provided with a pressure detection device for detecting the pressure of the slurry.

Preferably, the underflow cylinder is also provided with a mud layer quality sensor for detecting the slurry concentration.

The present invention also provides a thickener, including a body and an underflow circulation system arranged on the body, wherein the underflow circulation system is the underflow circulation system described in any one of the above.

The underflow circulation system of the thickener provided by the present invention mainly includes an underflow circulation pump and an underflow discharge pump. Wherein, the inlet of the underflow circulating pump is connected with the underflow cylinder, and its outlet is connected with the dense pool; the inlet of the underflow discharge pump is connected with the underflow cylinder, and its outlet is connected with the thick pool. Since the underflow cylinder is installed at the bottom of the thickening tank, the underflow slurry prepared in the thickening tank with a qualified concentration is gradually deposited in the underflow cylinder due to its own weight. When the underflow circulating pump is working normally, through the pressure of the slurry pump itself, the slurry with a qualified concentration deposited in the underflow cylinder can be sucked from the inlet and then sprayed out from the outlet. Therefore, the deposited pulp moves from the bottom flow cylinder to the bottom flow circulation pump, and then returns to the thickening tank from the pump, so that the pulp is forced to circulate in this way, which reduces the yield stress and viscosity of the pulp, and can effectively prevent the thickener from storing materials. Finally, the phenomenon of raking or jamming occurs, so that the thickener with underflow circulation system has the function of preparing and storing pulp at the same time; in addition, the pulp with qualified concentration can also be transported to the slurry discharge pipeline through the underflow discharge pump and discharged smoothly, providing for Subsequent process.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

Fig. 1 is the front view of the overall structure of the first specific embodiment provided by the present invention;

Fig. 2 is a left view of the underflow circulation system of the thickener shown in Fig. 1;

Fig. 3 is a top view of the underflow circulation system of the thickener shown in Fig. 1;

Fig. 4 is a schematic diagram of the overall structure of the second specific embodiment provided by the present invention;

Fig. 5 is a partial structural schematic diagram of a third specific embodiment provided by the present invention;

Fig. 6 is a partial structural schematic diagram of a third specific embodiment provided by the present invention;

Fig. 7 is a schematic diagram of a partial structure of a third specific embodiment provided by the present invention.

Wherein, among Fig. 1-Fig. 3:

Thickness tank—1, underflow cylinder—2, underflow circulation pump—3, inlet I—301, outlet I—302, underflow discharge pump—4, inlet II—401, outlet II—402, slurry discharge pipe—5, standpipe —6, ring pipe—7, the first three-way pipe—8, the second three-way pipe—9.

In Figure 4:

The first control valve-10, the second control valve-11, the third control valve-12, the fourth control valve-13, the fifth control valve-14, the sixth control valve-15.

In Fig. 5-Fig. 7:

Suction pipe—16, discharge pipe—17, flushing pipe—18, reserved interface—19, sampling port—20, pressure detection device—21, mud layer quality sensor device—22.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to FIG. 1 . FIG. 1 is a front view of the overall structure of a first specific embodiment provided by the present invention.

In the first specific embodiment provided by the present invention, the underflow circulation system of the thickener mainly includes a thickening tank 1 , an underflow cylinder 2 , an underflow circulation pump 3 and an underflow discharge pump 4 .

As shown in Figure 2 and Figure 3, Figure 2 is a left view of the underflow circulation system of the thickener shown in Figure 1; Figure 3 is a top view of the underflow circulation system of the thickener shown in Figure 1;

Among them, the thickening tank 1 is the main working place of the thickener, and the ore pulp is separated from the solid and liquid in the thickening tank 1 based on gravity settlement, so that the concentration of the ore pulp is increased. The relatively clear clarified liquid separated from the upper part of the thickening tank 1 is discharged from the annular chute at the top, while the denser pulp left is settled at the bottom of the thickening tank 1 due to its own weight. Since the underflow cylinder 2 is set at the bottom of the thickening tank 1, the ore pulp enters the underflow cylinder 2, which is generally called underflow ore pulp in engineering. Then, with the help of the slowly rotating rake installed in the thickening tank 1, the pulp is further dehydrated to achieve a higher underflow concentration, and at the same time, the thickened underflow pulp is discharged from the bottom of the thickener, and the pulp with a qualified concentration is provided to the subsequent process .

The underflow discharge pump 4 is generally arranged around the bottom of the thickening tank 1, and is mainly used to discharge the underflow ore pulp with a qualified concentration stored in the thickening tank 1. The inlet II401 of the underflow discharge pump 4 is connected with the underflow cylinder 2 at the bottom of the thickening tank 1 , and its outlet II402 is connected with the dedicated slurry discharge pipeline 5 . Therefore, when the underflow discharge pump 4 is in normal operation, under the pressure of the slurry pump, the qualified slurry in the underflow cylinder 2 enters the underflow discharge pump 4, and after it circulates in the underflow discharge pump 4, it is discharged from the underflow discharge pump 4. The outlet II402 of the discharge pump 4 flows into the slurry discharge pipeline 5, and finally discharges from the slurry discharge pipeline 5 to provide for the subsequent process.

The underflow circulating pump 3 is the core component of the present invention, and is generally arranged around the bottom of the thickening tank 1, and is mainly used for forced circulation of the underflow pulp with a qualified concentration. The inlet I301 of the underflow circulation pump 3 is connected with the underflow cylinder 2 at the bottom of the thickening tank 1 , while its outlet I302 is connected with the thickening tank 1 . Therefore, when the underflow circulating pump 3 is in normal operation, through the pressure of the slurry pump itself, the slurry with a qualified concentration deposited in the underflow cylinder 2 enters from the inlet I301, and after circulating in the underflow circulating pump 3 for a circle, then It flows out from the outlet I302 of the underflow circulation pump 3. Since the outlet I302 of the underflow circulation pump 3 is in communication with the thickening tank 1 , the underflow ore slurry flows back into the thickening tank 1 after being sprayed out from the outlet I302 of the underflow circulation pump 3 . In the end, the reciprocating force of the ore pulp circulates, reduces the yield stress and viscosity of the underflow ore pulp, and effectively prevents the thickener from being pressed or stuck after the thickener is stored, so that the thickener with the underflow circulation system has the functions of preparation and storage at the same time. The function of the pulp. Therefore, the thickener with underflow circulation system can stop the preparation of pulp temporarily when the subsequent process stops, which is beneficial to the continuous production of pulp.

In order to enhance the effect of forced circulation of underflow pulp, a riser 6 is provided on the outer wall of the thickening tank 1 in this embodiment. The inlet of the standpipe 6 is connected with the outlet I302 of the underflow circulation pump 3 , and its outlet is connected with the dense pool 1 . In this way, the underflow circulation pump 3 is first connected with the standpipe 6, and then connected with the dense pool 1 through the standpipe 6. Therefore, when the underflow circulating pump 3 is in normal operation, the underflow ore slurry with a qualified concentration passes through the underflow circulating pump 3, first enters the standpipe 6, and then flows back to the thickening tank 1 through the standpipe 6. Since the standpipe 6 is a pipeline with a certain height, after the underflow slurry is sprayed out from the underflow circulating pump 3, it will be forced to climb a certain distance, which is compared to directly flowing back to the thickening tank 1 after passing through the underflow circulating pump 3 , this method makes the circulation distance of the underflow pulp longer, the circulation time longer, and the overall circulation effect is better. Preferably, the position of the riser 6 on the outer wall of the thickening tank 1 is parallel to the axial direction of the thickening tank 1, that is, vertically arranged, so that when the length of the riser 6 is constant, the underflow slurry needs to completely overcome itself. Gravity performs vertical climbing movement. This kind of movement has the largest displacement and takes the longest time. Compared with other movement methods, it improves the effect of forced circular movement to a certain extent. Of course, if the standpipe 6 may not be vertically arranged, for example, an arrangement with a certain angle with the axial direction of the thickening pool 1 may also be adopted. In addition, the number of underflow circulation pumps 3 is not fixed, so the number of standpipes 6 is also not fixed, but generally, the standpipes 6 are relatively arranged in the axial direction, which can improve the effect of underflow circulation to a certain extent.

In order to further enhance the effect of the forced circulation of the underflow pulp, a ring pipe 7 is provided in the axial direction of the thickening tank 1 in this embodiment. The annular pipe 7 is annular and distributed around the dense pool 1 , and an outlet is provided on the annular pipe 7 , through which the annular pipe 7 communicates with the dense pool 1 . However, there is no inlet on the ring pipe 7, and the underflow slurry cannot directly enter the ring pipe for circulation. In view of this, the present embodiment adds a tee pipe: the first three-way pipe 8, wherein one of the interfaces of the tee pipe communicates with the standpipe 6, and the other two interfaces are connected to the ring pipe 7 and connected to the ring pipe 7. Or one of the interfaces communicates with the ring pipe 7, and the other two interfaces are connected to the riser 6, and the connection mode that communicates with the riser 6 is also acceptable. However, regardless of the connection method, through the action of the first three-way pipe 8 , the standpipe 6 and the ring pipe 7 are finally communicated. In this way, after the underflow slurry is ejected from the outlet I302 of the underflow circulating pump 3, part of it enters the standpipe 6 for climbing movement, and then flows back into the thickening tank 1; the other part passes through the first three-way pipe after entering the standpipe 6 8. After flowing into the ring pipe 7, it is divided into two streams and performs horizontal circular movement at the same time, and finally flows back into the dense pool 1 after converging at the outlet of the ring pipe 7.

In addition, the above content has mentioned the standpipe 6 and the ring pipe 7, and the outlets of the two pipes are connected to the dense pool 1, so the outlets of the standpipe 6 and the ring pipe 7 are all arranged on the outer wall of the thick pool 1. However, since the standpipe 6 has a certain height, the positions of the outlet of the standpipe 6 and the outlet of the ring pipe 7 are distributed with one high and one low in the axial direction. What is more important is that in the circumferential direction, although the exit position of the standpipe 6 and the exit position of the ring pipe 7 are not fixed, they need to be staggered by a certain angle in the circumferential direction. Since the pulp at the outlet of the ring pipe 7 is not on the same side as the pulp at the outlet of the standpipe 6, this is more conducive to the flow of the pulp in the thickening tank 1. But if it is on the same side, when the diameter of the thickening tank 1 is very large, the ore slurry at the outlet I302 of the underflow circulating pump 3 can only flow on one side, and the ore slurry on the other side may be compacted. When the area is solidified, it may be stuck or the phenomenon of raking may occur, so the underflow circulation system will not be able to solve the jamming or raking effect.

Here, preferably, the outlet position of the standpipe 6 and the outlet position of the ring pipe 7 form an angle of 30°-180° in the axial direction, and the optimal angle is 180°, that is, the outlet of the standpipe 6 and the outlet position of the ring pipe 7 The outlets are respectively located at the two ends of a certain diameter of the dense pool 1 and are arranged oppositely. In this way, the moving distance of the underflow slurry in the annular pipe 7 is equal to the circumference of the entire annular pipe 7, reaching the longest moving distance and longest moving time, and improving the effect of forced circulation to a certain extent. Of course, the outlet position of the standpipe 6 and the outlet position of the ring pipe 7 may not form an included angle of 180° in the axial direction, and other included angles such as 30°, 60°, and 90° can also achieve the purpose of the present invention.

To sum up, in this embodiment, the riser 6 communicates with the ring pipe 7 by adding the ring pipe 7 and utilizing the first three-way pipe 8 . When the underflow circulating pump 3 works normally, the underflow slurry can move in the vertical plane and the horizontal plane at the same time, which is equivalent to upgrading a single linear one-dimensional movement to a three-dimensional movement in space, which greatly improves the movement distance and movement time of the underflow slurry , thus greatly improving the effect of forced circulation of underflow pulp.

In addition, the effect of the forced circulation of the underflow pulp can be further enhanced. For this reason, the present embodiment adds the second three-way pipe 9. One of the joints of the three-way pipe communicates with the slurry discharge pipeline 5, and the other two joints communicate with the annular pipe 7; or one of the joints of the three-way pipe communicates with the annular pipe 7, and the other two joints communicate with the slurry discharge pipeline 5 connected. Regardless of the connection mode, through the action of the second three-way pipe 9 , the slurry discharge pipe 5 communicates with the annular pipe 7 . Therefore, after the underflow ore slurry is ejected from the outlet II402 of the underflow discharge pump 4, a part of it is directly discharged into the slurry discharge pipeline 5 and provided to the subsequent process, and the other part flows in through the second three-way pipe 9 when passing through the slurry discharge pipeline 5 Into the ring pipe 7, after performing circular movement in the ring pipe 7, it flows back to the dense pool 1 through the outlet of the ring pipe 7. To sum up, due to the existence of the second three-way pipe 9, the slurry discharge pipe 5 communicates with the annular pipe 7. While the underflow pulp is discharged from the slurry discharge pipe 5, it can also flow into the ring pipe 7 to continue to circulate, which improves the effect of the forced circulation of the underflow pulp to a certain extent.

This embodiment also provides a thickener, including a fuselage and an underflow circulation system arranged on the fuselage, wherein the underflow circulation system is the same as the above, and will not be repeated here.

Please refer to FIG. 4, which is a schematic diagram of the overall structure of the second specific embodiment provided by the present invention;

The second specific embodiment provided by the present invention is improved on the basis of the first specific embodiment, specifically: a control valve is added. The remaining parts of the underflow circulation system provided by this embodiment are the same as those described above, and will not be repeated here.

In the actual engineering operation, due to the complex and changeable supply and demand situation of the industrial chain, it is necessary for the underflow circulation system of the thickener to realize multiple functions such as side discharge and side circulation, only circulation without discharge, and only discharge without circulation. For this reason, in the second embodiment provided by the present invention, in order to ensure that the thickener can flexibly perform operations such as preparation, storage or discharge as required, control valves are added at several key positions of the underflow circulation system. Since the function of the control valve in the hydraulic system is to open or close its own channel, the existence of the control valve can make the pipelines at both ends of the control valve communicate or block.

First of all, a first control valve 10 is set on the slurry discharge pipeline 5. Due to the function of the first control valve 10, the opening or closing of the slurry discharge pipeline 5 can be controlled at any time, so that the ore pulp entering the slurry discharge pipeline 5 can be circulated or blocked. . Then, a second control valve 11 is set on the standpipe 6, and also due to the effect of the second control valve 11, the standpipe 6 can be controlled to open or close at any time. Secondly, a control valve is also set on the ring pipe 7, specifically, a third control valve 12 is set at one interface of the first three-way pipe 8, and a third control valve 12 is set at another interface of the first three-way pipe 8. The fourth control valve 13, by simultaneously opening or closing the third control valve 12 and the fourth control valve 13, can conduct or block the slurry flowing into the first three-way pipe 8 at any time. Finally, also on the ring pipe 7, a fifth control valve 14 is arranged at one interface of the second three-way pipe 9, and a sixth control valve 15 is arranged at the other interface of the second three-way pipe 9, through Simultaneously opening or closing the fifth control valve 14 and the sixth control valve 15 can conduct or block the ore slurry flowing into the second three-way pipe 9 at any time.

Continuing from the above, for the underflow circulation system of the thickener to realize the working condition of simultaneous circulation and simultaneous discharge, the first control valve 10 needs to be opened, so that the slurry discharge pipeline 5 is in a conductive state, and the ore pulp is discharged through the slurry discharge pipeline 5; On the other hand, the second control valve 11 needs to be opened to make the standpipe 6 in a conduction state, and the ore slurry circulates through the standpipe 6 . As for the third control valve 12 and the fourth control valve 13 as well as the fifth control valve 14 and the sixth control valve 15, they can be opened or closed arbitrarily. If the above-mentioned four control valves are all opened, the ore slurry ejected from the underflow circulation pump 3 will perform climbing motion and horizontal circular motion at the same time, and the ore slurry ejected from the underflow discharge pump 4 will perform discharge and horizontal circular motion at the same time; If the third control valve 12 and the fourth control valve 13 are opened, and the fifth control valve 14 and the sixth control valve 15 are closed, the ore slurry ejected from the underflow circulation pump 3 will perform a climbing motion and a horizontal annular motion, The ore slurry ejected from the underflow discharge pump 4 is only discharged without circulating motion; if the third control valve 12 and the fourth control valve 13 are closed, and the fifth control valve 14 and the sixth control valve 15 are opened, then The ore slurry ejected from the underflow circulation pump 3 only performs a climbing motion, and the ore slurry ejected from the underflow discharge pump 4 also performs a horizontal circular motion while being discharged.

Secondly, for the underflow circulation system of the thickener to realize the working condition of only circulation and no discharge, the first control valve 10 needs to be closed, so that the slurry discharge pipeline 5 is in a cut-off state, and the pulp cannot be discharged through the slurry discharge pipeline 5. On the other hand, the second control valve 11 needs to be opened to make the standpipe 6 in a conduction state, and the ore slurry circulates through the standpipe 6 . As for the third control valve 12 and the fourth control valve 13 as well as the fifth control valve 14 and the sixth control valve 15, they can be opened or closed arbitrarily. If the above four control valves are all opened, the ore slurry ejected from the underflow circulation pump 3 will perform climbing motion and horizontal circular motion at the same time, and the ore slurry ejected from the underflow discharge pump 4 will only perform horizontal circular motion; The third control valve 12 and the fourth control valve 13 are opened, and the fifth control valve 14 and the sixth control valve 15 are closed, so that the ore slurry ejected from the underflow circulating pump 3 will perform a climbing motion and a horizontal circular motion. The ore slurry discharged from the discharge pump 4 neither discharges nor circulates, which is equivalent to stopping the operation of the underflow discharge pump 4; if the third control valve 12 and the fourth control valve 13 are closed, the fifth control valve When the valve 14 and the sixth control valve 15 are opened, the ore slurry ejected from the underflow circulation pump 3 only performs a climbing motion, and the ore slurry ejected from the underflow discharge pump 4 only performs a horizontal annular movement.

Finally, for the underflow circulation system of the thickener to realize the working condition of only discharge and no circulation, the first control valve 10 needs to be opened to make the slurry discharge pipeline 5 in a conductive state, and the pulp is discharged through the slurry discharge pipeline 5 . On the other hand, it is necessary to close the second control valve 11 so that the standpipe 6 is in a cut-off state, and the slurry cannot circulate through the standpipe 6 . As for the third control valve 12 and the fourth control valve 13 as well as the fifth control valve 14 and the sixth control valve 15, they are quite special. In this working condition, the above four control valves need to be all closed.

To sum up, in this embodiment, by setting control valves at several key pipeline positions of the underflow circulation system, and by opening or closing the corresponding control valves, the underflow circulation pump 3 and the underflow discharge pump 4 are mutually independent or mutually standby. , capable of coping with various working conditions that may arise during actual production operations.

This embodiment also provides a thickener, including a fuselage and an underflow circulation system arranged on the fuselage, wherein the underflow circulation system is the same as the above, and will not be repeated here.

Please refer to Fig. 5, Fig. 6 and Fig. 7, Fig. 5 is a partial structural schematic view of a third specific embodiment provided by the present invention; Fig. 6 is a partial structural schematic view of a third specific embodiment provided by the present invention; Fig. 7 is a schematic diagram of the partial structure of the third embodiment provided by the present invention.

The third specific implementation mode provided by the present invention is improved on the basis of the second specific implementation mode, specifically: devices needed for actual engineering operations are added. The remaining parts of the underflow circulation system provided by this embodiment are the same as those described above, and will not be repeated here.

In the third embodiment provided by the present invention, the underflow circulation system of the thickener is optimized. First, a suction pipe 16 is provided at the inlet I301 of the underflow circulation pump 3 and the inlet II401 of the underflow discharge pump 4. The function of the suction pipe 16 is to increase the suction force of the pump body and assist the pump body in suction. Therefore, under the action of the suction pipe 16, when the underflow circulation pump 3 and the underflow discharge pump 4 are operating, the qualified ore slurry deposited in the underflow cylinder 2 can be sucked into the pump body more smoothly and conveniently, reducing the The load of the underflow circulation pump 3 and the underflow circulation pump 4 reduces the consumption of electric energy and saves the production cost.

For the same consideration, in this embodiment, a discharge pipe 17 is provided at the outlet of the standpipe 6 and the exit of the annular pipe 7, and the function of the discharge pipe 17 is to increase the pressure of the pipeline and assist in discharging. Therefore, under the action of the discharge pipe 17, the ore slurry flowing through the standpipe 6 and the ring pipe 7 will be subjected to a larger injection pressure when passing through the outlets of the two, so that it can be ejected smoothly, which reduces the impact of the ore slurry on the Stagnation on the inner wall of the pipeline.

In this embodiment, a flushing pipe 18 is provided at the inlet II401 of the underflow discharge pump 4. When the underflow circulation system is in operation, the concentration of the underflow slurry may be too high, resulting in pipeline blockage. With the flushing pipe 18, when the pipeline is blocked, the external water pressure can be used to backwash the pipeline, so as to dredge the pipeline and restore the underflow circulation system to normal.

In the actual engineering operation, there may be insufficient discharge volume of the underflow discharge pump 4, or even the situation that the underflow discharge pump 4 is damaged due to failure and cannot discharge the slurry normally. When the load limit is reached, the thickener will be damaged. In view of this, in this embodiment, a reserved interface 19 is provided on the underflow cylinder 2 . Therefore, when the above-mentioned emergency occurs, the excess slurry can be discharged through the reserved interface 19 to relieve the pressure of the underflow circulation system.

The pulp with qualified concentration in the thickener needs to be inspected for quality before being supplied to the subsequent process. For this reason, in this embodiment, a sampling port 20 is provided on the standpipe 6, through which quality inspectors can conduct sampling surveys on the circulating underflow pulp through the sampling port 20, thereby judging whether the quality indicators such as the concentration of the pulp are qualified.

In order to ensure the life safety of the operators and the service life of various devices in the underflow circulation system of the thickener, a pressure detection device 21 is set on the underflow cylinder 2, the standpipe 6 or the ring pipe 7 in this embodiment, and the operator can read the The parameters of the pressure detection device 21 are used to obtain the pressure of the pulp in the pipeline of the underflow circulation system, so as to determine the concentration of the pulp, and then perform operations such as pressurization or decompression.

In addition, in order to detect the concentration and quality of the ore pulp in the underflow cylinder 2, this embodiment also sets a mud layer quality sensor 22 on the underflow cylinder 2, which can detect parameters such as the concentration and quality of the ore pulp in the underflow cylinder 2 in real time, for reference by technicians.

This embodiment also provides a thickener, including a fuselage and an underflow circulation system arranged on the fuselage, wherein the underflow circulation system is the same as the above, and will not be repeated here.

Claims (17)

1. the underflow blood circulation of a kind of concentrator, including thickening pond (1) and the underflow cylinder of the thickening pond (1) bottom is arranged at (2), it is characterised in that also including underflow circulating pump (3) and underflow discharge pump (4)；The entrance I of the underflow circulating pump (3) (301) it is connected with the underflow cylinder (2), outlet I (302) is connected with the thickening pond (1), underflow discharge pump (4) enter Mouth II (401) is connected with the underflow cylinder (2), and outlet II (402) is connected with plasma discharge pipeline (5)；The outer wall of the thickening pond (1) Standpipe (6) is provided with, the outlet I (302) of the underflow circulating pump (3) is connected with the entrance of the standpipe (6), the standpipe (6) outlet is connected with the thickening pond (1)；

Endless tube (7), the outlet of the endless tube (7) and the thickening pond are surrounded with the circumferential direction of the thickening pond (1) (1) it is connected；The standpipe (6) is connected by the first tee T (8) with the endless tube (7).

2. underflow blood circulation according to claim 1, it is characterised in that the standpipe (6) is parallel to the thickening pond (1) axial direction is arranged on the outer wall of the thickening pond (1).

3. underflow blood circulation according to claim 1, it is characterised in that also including the second tee T (9), the plasma discharge Pipeline (5) is connected by second tee T (9) with the endless tube (7).

4. underflow blood circulation according to claim 1, it is characterised in that the exit position of the standpipe (6) with it is described Stagger in the circumferential the exit position of endless tube (7).

5. underflow blood circulation according to claim 4, it is characterised in that the exit position of the standpipe (6) with it is described The exit position of endless tube (7) is in the circumferential into 30 ° -180 ° of angle.

6. underflow blood circulation according to claim 1, it is characterised in that also including being arranged at the plasma discharge pipeline (5) Upper the first control valve (10) for being used to be turned on and off the plasma discharge pipeline (5).

7. underflow blood circulation according to claim 2, it is characterised in that also use including being arranged on the standpipe (6) In the second control valve (11) for being turned on and off the standpipe (6).

8. underflow blood circulation according to claim 1, it is characterised in that also including being arranged on the endless tube (7), position In the 3rd control valve (12) of the one of seam of first tee T (8) and positioned at the another of first tee T (8) 4th control valve (13) of one seam.

9. underflow blood circulation according to claim 3, it is characterised in that also including being arranged on the endless tube (7), position In the 5th control valve (14) and another positioned at second tee T (9) of the one of seam of second tee T (9) 6th control valve (15) of individual seam.

10. underflow blood circulation according to claim 1, it is characterised in that the entrance I of the underflow circulating pump (3) (301) entrance II (401) place of place and the underflow discharge pump (4) is provided with suction tube (16).

11. underflow blood circulation according to claim 1, it is characterised in that the exit of the standpipe (6) and the ring The exit of pipe (7) is provided with drainage conduit (17).

12. underflow blood circulation according to claim 1, it is characterised in that the entrance II of the underflow discharge pump (4) (401) place is additionally provided with the flush pipe for being dredged in line clogging (18).

13. underflow blood circulation according to claim 1, it is characterised in that be provided with for auxiliary on the underflow cylinder (2) Help the spare interface (19) of discharge.

14. underflow blood circulation according to claim 2, it is characterised in that be provided with for sampling on the standpipe (6) The sample tap (20) of ore pulp sample.

15. underflow blood circulation according to claim 1, it is characterised in that the standpipe (6) or the endless tube (7) or The pressure-detecting device (21) for detecting ore pulp pressure is provided with the underflow cylinder (2).

16. underflow blood circulation according to claim 1, it is characterised in that be additionally provided with the underflow cylinder (2) for The mud layer mass sensor (22) of detection pulp density.

A kind of 17. concentrators, including fuselage and the underflow blood circulation being arranged on the fuselage, it is characterised in that the bottom Flow circulating system is the underflow blood circulation described in any one of claim 1-16.