A tailings processing system, method and ore processing system

Abstract

The application discloses a tailing treatment system, a tailing treatment method and an ore treatment system. The tailing treatment system comprises a tailing thickener and first, second, third and fourth lines for tailing transportation. The first line and the second line are arranged in parallel between coarse-grained tailing sources and a feeding port of the tailing thickener, and the third line and the fourth line are arranged in parallel between a discharging port of the tailing thickener and an underground filling system. A first valve is arranged on the first line, a second valve and a first sand dredger are arranged on the second line, a third valve and a second sand dredger are arranged on the third line, and a fourth valve is arranged on the fourth line. The technical scheme of the application realizes stable adjustment and control of tailing quantity of a beneficiation plant according to changes in properties of mined ores and a demand quantity of underground tailing filling, so that the tailing quantity is matched, and balance of mining and beneficiation production is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to Mining engineering ore dressing TECHNICAL FIELD, in particular to a tailings processing system, method and ore processing system, and specifically to a tailings filling quantity and tailings production quantity balancing method for underground mining. BACKGROUND

[0002] The open-pit mining operation of the mining industry will cause damage to the surface ecology; at the same time, the ore dressing operation of the mine will produce a large amount of tailings, which is generally treated by stacking in a tailings pond. However, tailings pond stacking will have a huge impact on the ecological environment and pose a great safety hazard. With the development of society, people's requirements for environmental protection are becoming increasingly stringent. Therefore, new mines generally adopt underground mining methods, and the tailings produced by ore dressing are treated by underground filling, without building tailings ponds, to reduce the impact on the environment.

[0003] However, due to the different properties of underground ores, the properties of ores in different regions differ greatly, resulting in a large fluctuation in the amount of tailings produced in production as the properties of ores change, while the amount of tailings required for filling is relatively fixed, often leading to a mismatch between the amount of tailings required for filling and the amount of tailings produced. When the amount of tailings produced is large, this part of the tailings needs to be discharged to the ground, polluting the environment; when the amount of tailings produced is small, the amount of tailings required for filling is not enough, and the underground mine room cannot be filled in time, which will affect the normal mining of the mining operation and restrict the production of the mine. SUMMARY

[0004] In view of the above problems, the present application is proposed in order to provide a tailings processing system, method and ore processing system that overcomes the above problems or at least partially solves the above problems, which can stabilize the amount of tailings produced by ore dressing according to the change in the properties of mined ores and the amount of tailings required for filling, and balance the amount of tailings required for filling and the amount of tailings produced.

[0005] In a first aspect, a tailings processing system is provided, comprising: a tailings thickener and a first line, a second line, a third line and a fourth line for tailings transportation;

[0006] The first line and the second line are arranged in parallel between the coarse-grained tailings source and the feed inlet of the tailings thickener, and the third line and the fourth line are arranged in parallel between the discharge outlet of the tailings thickener and the underground filling system;

[0007] A first valve is arranged on the first line;

[0008] A second valve and a first sand dredger are arranged on the second line;

[0009] A third valve and a second sand dredger are arranged on the third line;

[0010] A fourth valve is arranged on the fourth line.

[0011] Optionally, a fifth line is arranged between the magnetic separation tailings source and the feed inlet of the tailings thickener.

[0012] Optionally, a first slurry pump is arranged on the second line between the second valve and the feed inlet of the first sand reclaimer.

[0013] Optionally, a second slurry pump is arranged on the third line between the third valve and the feed inlet of the second sand reclaimer.

[0014] Optionally, the first sand reclaimer is a coarse sand reclaimer, and the second sand reclaimer is a fine sand reclaimer.

[0015] Optionally, the underground filling system is provided with a liquid level meter.

[0016] In a second aspect, a method for tailings treatment using the tailings treatment system of the first aspect, comprising:

[0017] When the amount of tailings is less than the filling requirement, the second valve and the third valve are closed, and the first valve and the fourth valve are opened, so that the concentrated tailings obtained by the tailings thickener are sent to the underground filling system for tailings filling through the fourth line;

[0018] When the amount of tailings is greater than the filling requirement, the first valve and the third valve are closed, and the second valve and the fourth valve are opened, so that the coarse-grained tailings are sent to the first sand reclaimer to reclaim construction sand, and the obtained tailings are sent to the tailings thickener for concentration, and then sent to the underground filling system for tailings filling through the fourth line;

[0019] Alternatively, when the amount of tailings is greater than the filling requirement, the first valve and the third valve are opened, and the second valve and the fourth valve are closed, so that the concentrated tailings are sent to the second sand reclaimer to reclaim construction sand, and the obtained tailings are sent to the underground filling system for tailings filling through the fourth line;

[0020] Alternatively, when the amount of tailings is greater than the filling requirement, the first valve and the fourth valve are closed, and the second valve and the third valve are opened, so that the coarse-grained tailings are sent to the first sand reclaimer to reclaim construction sand once, and the obtained tailings are sent to the tailings thickener for concentration, and then sent to the second sand reclaimer to reclaim construction sand again, and the obtained tailings are sent to the underground filling system for tailings filling.

[0021] Optionally, further comprising: determining the size relationship between the tailing amount and the filling demand amount through the liquid level amount of the underground filling system.

[0022] In a third aspect, the application provides an ore processing system, comprising a dry separator, a first magnetic separator, a tailing processing system, wherein the discharge port of the dry separator is connected to the feeding port of the first magnetic separator, and the waste outlet of the first magnetic separator forms a coarse tailing source.

[0023] The tailing processing system comprises a tailing thickener and first, second, third and fourth lines for tailing transportation, wherein the first and second lines are arranged in parallel between the coarse tailing source and the feeding port of the tailing thickener, and the third and fourth lines are arranged in parallel between the discharge port of the tailing thickener and an underground filling system; the first line is provided with a first valve; the second line is provided with a second valve and a first sand dredger; the third line is provided with a third valve and a second sand dredger; and the fourth line is provided with a fourth valve.

[0024] Optionally, the system further comprises a ball mill, a cyclone and a second magnetic separator, wherein the feeding port of the ball mill is connected to the screened material outlet of the first magnetic separator, the feeding pipe of the cyclone is connected to the discharge port of the ball mill, the underflow pipe of the cyclone is connected to the feeding port of the ball mill, the feeding port of the second magnetic separator is connected to the overflow pipe of the cyclone, the waste outlet of the second magnetic separator forms a magnetic tailing source, and a fifth line is arranged between the magnetic tailing source and the feeding port of the tailing thickener.

[0025] The technical scheme provided in the embodiments of the application has at least the following technical effects or advantages:

[0026] The tailing processing system and method and the ore processing system provided in the embodiments of the application can realize stable adjustment and control of the tailing amount of the ore dressing plant according to the change of the properties of the mined ore and the filling demand amount of the underground tailing filling, so as to match the tailing amount, ensure the balance of the mining and dressing production, and finally realize the underground filling of all tailings, without the need of building a tailing pond, without the external discharge of tailings, and in compliance with the environmental protection requirements.

[0027] The above description is only a summary of the technical scheme of the application, in order to more clearly understand the technical means of the application, the specific embodiments of the application can be implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the application more obvious and easy to understand, the following specifically describes the embodiments of the application. BRIEF DESCRIPTION OF DRAWINGS

[0028] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0029] Figure 1 This is a schematic diagram of the tailings treatment system in an embodiment of the present invention;

[0030] Figure 2 This is a flowchart of the tailings treatment method in an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the ore processing system in an embodiment of the present invention. Figure 1 ;

[0032] Figure 4 This is a schematic diagram of the ore processing system in an embodiment of the present invention. Figure 2 . Detailed Implementation

[0033] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings.

[0034] The accompanying drawings illustrate various structural schematics according to embodiments of the present disclosure. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0035] To better understand the above technical solutions, the following will describe the above technical solutions in detail with reference to specific implementation methods. It should be understood that the embodiments of this disclosure and the specific features in the embodiments are detailed descriptions of the technical solutions of this application, rather than limitations on the technical solutions of this application. In the absence of conflict, the embodiments of this application and the technical features in the embodiments can be combined with each other.

[0036] This invention provides a tailings treatment system, please refer to... Figure 1 , Figure 1 This is a schematic diagram of a tailings treatment system in an embodiment of the present invention, including: a tailings thickener and a first line, a second line, a third line, and a fourth line for tailings transportation;

[0037] The first line and the second line are arranged in parallel between the coarse-grained tailings source and the feed inlet of the tailings thickener, and the third line and the fourth line are arranged in parallel between the discharge outlet of the tailings thickener and the underground filling system.

[0038] A first valve is arranged on the first line.

[0039] A second valve and a first sand bailing machine are arranged on the second line.

[0040] A third valve and a second sand bailing machine are arranged on the third line.

[0041] A fourth valve is arranged on the fourth line.

[0042] Based on the same inventive concept, the present application also provides a tailings treatment method, as shown in Figure 2 Figure 2 is a flow chart of the tailings treatment method in the embodiments of the present application, comprising:

[0043] When the tailings amount is less than the filling demand amount, the second valve and the third valve are closed, and the first valve and the fourth valve are opened, so that the concentrated tailings obtained by the tailings thickener are sent to the underground filling system through the fourth line for tailings filling.

[0044] When the tailings amount is greater than the filling demand amount, the first valve and the third valve are closed, and the second valve and the fourth valve are opened, so that the coarse-grained tailings are sent to the first sand bailing machine to bail construction sand, and the obtained tailings are sent to the tailings thickener for concentration, and then sent to the underground filling system through the fourth line for tailings filling.

[0045] Alternatively, when the tailings amount is greater than the filling demand amount, the first valve and the third valve are opened, and the second valve and the fourth valve are closed, so that the concentrated tailings are sent to the second sand bailing machine to bail construction sand, and the obtained tailings are sent to the underground filling system through the fourth line for tailings filling.

[0046] Alternatively, when the tailings amount is greater than the filling demand amount, the first valve and the fourth valve are closed, and the second valve and the third valve are opened, so that the coarse-grained tailings are sent to the first sand bailing machine to bail construction sand once, and the obtained tailings are sent to the tailings thickener for concentration, and then sent to the second sand bailing machine to bail construction sand again, and the obtained tailings are sent to the underground filling system for tailings filling. When the tailings amount is greater than the filling demand amount, the first sand bailing machine and the second sand bailing machine are preferentially selected to be used alternatively, and if it is found that the tailings amount is still greater than the filling demand amount after sand bailing, the first sand bailing machine and the second sand bailing machine are selected to be used simultaneously, so as to increase the sand bailing amount and reduce the tailings amount. ​

[0047] As an optional embodiment, the tailings treatment system further comprises a fifth line arranged between the source of the magnetic separation tailings and the feed inlet of the tailings thickener. The coarse tailings source is formed by the waste material obtained through crushing, dry separation, high-pressure roller grinding and pre-magnetic separation. The waste material obtained through grinding, classification and magnetic separation of the screened material obtained through pre-magnetic separation forms the magnetic separation tailings source of the coarse tailings source. The tailings particles of the coarse tailings source are large, and therefore the first sand dredge machine can be a coarse sand dredge machine. The coarse sand dredged by the coarse sand dredge machine has a wide range of uses and high benefits when used as construction sand. When the amount of tailings is greater than the filling demand, the coarse sand dredge machine is preferentially selected to dredge coarse sand first. The amount of dredged coarse sand is large, which greatly reduces the amount of tailings. If the amount of tailings is still too large after the coarse sand is dredged, a second sand dredge machine is started at the same time. The second sand dredge machine can be a fine sand dredge machine. The fine sand dredged by the fine sand dredge machine has a narrower range of uses than the coarse sand, but still has certain application requirements and benefits. After the tailings are treated by the sand dredge machine, the amount of tailings filled by the underground filling system is reduced, thereby ensuring the balance between mining and production, and ultimately realizing the full underground filling of tailings without the need to build a tailings pond and without the external discharge of tailings.

[0048] As an optional embodiment, the tailings treatment system further comprises a first slurry pump arranged on the second line and located between the second valve and the feed inlet of the first sand dredge machine. The first slurry pump directs the ore liquid of the coarse tailings into the first sand dredge machine. Similarly, the tailings treatment system further comprises a second slurry pump arranged on the third line and located between the third valve and the feed inlet of the second sand dredge machine. The second slurry pump directs the tailings liquid concentrated by the tailings thickener into the second sand dredge machine.

[0049] As an optional embodiment, a liquid level meter is arranged in the underground filling system to determine the size relationship between the amount of tailings and the filling demand based on the liquid level of the underground filling system. Specifically, a liquid level meter is installed at a point of the deep-cone thickener of the underground tailings filling system. The liquid level data collected by the liquid level meter reflect whether the amount of tailings produced by the ore dressing is greater than or less than the filling demand.

[0050] The tailings treatment system and method of the present embodiment will be described in detail below with reference to examples. Taking magnetite as an example, the explanation is as follows:

[0051] To achieve a balance between the amount of tailings filling and the amount of tailings generated in underground mining, magnetite ore undergoes crushing, dry separation, high-pressure roller milling, pre-magnetic separation, grinding, classification, and beneficiation to obtain large-particle dry-separated waste rock, coarse tailings, magnetic concentrate, and magnetic tailings. The large-particle dry-separated waste rock is fed into a waste rock bin for further processing. The coarse tailings are fed into a construction sand dredging machine via a slurry pump to extract construction sand. The remaining tailings after extracting construction sand from the coarse tailings are combined with the magnetic tailings and fed into a tailings thickener. The thickener is then fed into a dry sand discharge dredging machine via a thickener underflow pump to extract dry sand. The remaining tailings after dry sand discharge enter the underground tailings filling system.

[0052] In addition to being connected to the integrated sand dredging machine, the coarse tailings slurry pump is also equipped with pipes and valves, which can be used to feed coarse tailings directly into the tailings thickener without going through the integrated sand dredging machine.

[0053] In addition to being connected to the dry sand discharge and sand dredging integrated machine, the aforementioned thickening underflow pump is also equipped with pipelines and valves, which can be selected to feed the thickened tailings directly into the underground tailings filling system without going through the sand dredging integrated machine.

[0054] During normal production, all coarse tailings and magnetic separation tailings are fed into the tailings thickener. After thickening, the tailings are fed into the underground filling system via the thickener's underflow pump.

[0055] When the tailings production of the mining plant is less than the tailings filling volume in the mining area, the operating parameters of the dry separator are adjusted to reduce the amount of dry separation waste rock produced, allowing some waste rock products to enter the subsequent process, increasing the production of coarse tailings and magnetic separation tailings, and making up for the insufficient amount of filling tailings.

[0056] When the tailings production of the mining plant exceeds the tailings filling volume in the mining area, the coarse tailings are pumped to a construction sand dredging machine via a slurry pump to extract construction sand for sale, thus reducing some of the tailings. If the remaining tailings production after extracting construction sand still exceeds the tailings filling volume in the mining area, the concentrated tailings underflow (i.e., the tailings remaining after extracting construction sand from the coarse tailings and the tailings after magnetic separation) is then sent to a dry sand dredging machine to extract dry sand for sale, further reducing some of the tailings.

[0057] Meanwhile, when there are small fluctuations between the amount of tailings produced in the beneficiation plant and the amount of tailings backfilled underground, the sand scouring rate of the integrated construction sand scouring machine and the integrated dry sand scouring machine can be increased or decreased by adjusting parameters such as the operating frequency of the slurry pump and the bottom flow pump of the thickener, and the slurry concentration, so as to achieve a balance between the amount of tailings produced in the beneficiation plant and the amount of tailings backfilled underground.

[0058] Based on the same inventive concept, embodiments of the present invention also provide an ore processing system, such as... Figure 3 As shown, Figure 3 This is a schematic diagram of the ore processing system in an embodiment of the present invention. Figure 1, including a dry separator, a first magnetic separator, a tailings treatment system, a discharge port of the dry separator being connected with a feed port of the first magnetic separator; a waste outlet of the first magnetic separator forming a coarse tailings source;

[0059] The tailings treatment system includes a tailings thickener and first, second, third and fourth lines for tailings transportation; the first and second lines are arranged in parallel between the coarse tailings source and a feed port of the tailings thickener, and the third and fourth lines are arranged in parallel between a discharge port of the tailings thickener and an underground filling system; a first valve is arranged on the first line; a second valve and a first sand dredger are arranged on the second line; a third valve and a second sand dredger are arranged on the third line; and a fourth valve is arranged on the fourth line.

[0060] Specifically, the ore processing system further includes a ball mill, a cyclone and a second magnetic separator; a feed port of the ball mill is connected with a screened material outlet of the first magnetic separator; a feed pipe of the cyclone is connected with a discharge port of the ball mill, and an underflow pipe of the cyclone is connected with a feed port of the ball mill; a feed port of the second magnetic separator is connected with an overflow pipe of the cyclone, a waste outlet of the second magnetic separator forms a magnetic tailings source, and a fifth line is arranged between the magnetic tailings source and a feed port of the tailings thickener.

[0061] The ore processing system of the embodiment will be described in detail below with reference to examples, as shown in Figure 4 , as shown in Figure 4 , which is a schematic diagram of the ore processing system in the embodiment of the present application Figure 2 A balance method for tailings filling quantity and tailings production quantity in an underground mine according to the present application includes crushing, grinding, separation and selection treatment of magnetite raw ore through a crusher 1, a dry separator 2, a high-pressure roller mill 3, a pre-separation magnetic separator 4, a ball mill 5, a cyclone 6 and a magnetic separator 7, to obtain dry waste rock, coarse tailings, magnetic concentrate and magnetic tailings, respectively; the dry waste rock is fed into a waste rock bin for sale, and the coarse tailings and the magnetic tailings are combined and fed into a tailings thickener 11; the tailings thickener 11 is sent to an underground tailings filling system through a thickener underflow pump 8-2.

[0062] The coarse tailings are connected to the tailings thickener 11 and a slurry pump 8-1 through a pipeline, and valves 12-1 and 12-2 are arranged on the two pipelines, respectively, to control the direction of the coarse tailings; the slurry pump 8-1 is connected to a building sand dredging integrated machine 9 for dredging building sand from the coarse tailings; the thickener underflow pump is connected to the underground filling system and a dry sand dredging integrated machine 10 through a pipeline, and valves 13-1 and 13-2 are arranged on the two pipelines, respectively, to control the direction of the thickener underflow; and the dry sand dredging integrated machine is used to dredge dry sand from the combined tailings.

[0063] When the mine is in normal production, the valves 12-1 and 13-2 are opened, and the valves 12-2 and 13-1 are closed, so that the coarse-grained tailings and the magnetic separation tailings are all fed into the tailings thickener 11, and after thickening, the tailings are fed into the underground filling system through the thickener underflow pump 8-2.

[0064] When the tailings produced by the concentrator are less than the underground tailings filling amount of the stope, the operating parameters of the dry separator 2 are adjusted to reduce the amount of dry separation waste rock, so that part of the waste rock product enters the subsequent process, the amount of coarse-grained tailings and magnetic separation tailings is increased, and the shortage of filling tailings is made up.

[0065] When the tailings produced by the concentrator are greater than the underground tailings filling amount of the stope, the valve 12-1 is closed and the valve 12-2 is opened, so that the coarse-grained tailings are sent to the building sand and dredging integrated machine 9 through the slurry pump 8-1 to dredge the building sand for sale, thereby reducing part of the tailings; after the building sand is dredged, if the remaining tailings production is still greater than the underground tailings filling amount of the stope, the valve 13-2 is closed and the valve 13-1 is opened, so that the tailings thickening underflow (i.e. the tailings after the coarse-grained tailings are dredged for building sand and the tailings after the magnetic separation tailings are combined) is sent to the dry sand dredging integrated machine 10 to dredge the dry sand for sale, thereby reducing part of the tailings again.

[0066] In order to effectively control and adjust the tailings amount produced by the concentrator, the following measures are adopted in the present application:

[0067] The liquid level meter is installed at the point of the deep-cone thickener of the underground tailings filling system, and whether the tailings amount produced by the concentrator is greater or less than the filling demand is reflected according to the liquid level data collected by the liquid level meter.

[0068] When the liquid level changes greatly, it indicates that there is a great fluctuation between the tailings amount produced by the concentrator and the underground tailings filling amount.

[0069] If the liquid level rises, it indicates that the filling tailings demand is less than the tailings amount produced by the concentrator, and the tailings amount produced by the concentrator needs to be reduced. At this time, the belt speed and the distribution plate parameters of the dry separator 2 are first considered to be adjusted to increase the dry separation waste rock yield and reduce the tailings production; secondly, the valve 12-1 is considered to be closed and the valve 12-2 is considered to be opened, so that the coarse-grained tailings are sent to the building sand dredging integrated machine 9 through the slurry pump 8-1, and the building sand can be dredged; if the liquid level still has a rising trend, finally the valve 13-2 is closed and the valve 13-1 is opened, so that the tailings thickening underflow (i.e. the tailings after the coarse-grained tailings are dredged for building sand and the tailings after the magnetic separation tailings are combined) is sent to the dry sand dredging integrated machine 10 to dredge the dry sand for sale.

[0070] If the liquid level decreases, it indicates that the tailings filling amount demand is greater than the tailings production amount of the concentrator, and the tailings production amount of the concentrator needs to be increased. First, close valve 13-1, open valve 13-2, cancel the dry sand dredging, and directly send the tailings thickening underflow (i.e. the remaining tailings after the coarse-grained tailings dredging construction sand and the tailings after the combination of the magnetic separation tailings) to the underground filling system; second, consider closing valve 12-2 and opening valve 12-1, canceling the dredging of construction sand, and directly sending the coarse-grained tailings to the tailings thickener 11; and finally, consider adjusting the belt speed and the distribution plate parameters of the dry separator 2, reducing the waste rock yield of the dry separator, and increasing the tailings production amount.

[0071] When the liquid level changes in a small range, it indicates that there is a small fluctuation between the tailings production amount of the concentrator and the underground tailings filling amount, and the sand dredging integrated machine 9 and the dry sand dredging integrated machine 10 can be slightly increased or reduced in the sand dredging yield by adjusting the operation frequency, the slurry concentration and other parameters of the slurry pump 8-1 and the thickener underflow pump 8-2, so that the tailings amount of the concentrator production and the underground tailings filling demand are balanced.

[0072] The technical scheme provided in the embodiment of the present application has at least the following technical effects or advantages:

[0073] The tailings treatment system and method and the ore treatment system provided by the embodiment of the present application realize stable adjustment and control of the tailings amount produced by the concentrator according to the change in the properties of the mined ore and the demand of the underground tailings filling, so that the tailings amount produced by the concentrator is matched, the mining and selection production is balanced, the tailings are completely filled underground, the tailings are not discharged, and the environmental protection requirements are met.

[0074] In the description provided herein, a large number of specific details are described. However, it can be understood that the embodiments of the present application can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not described in detail in order not to obscure the understanding of the present description.

[0075] Similarly, it should be appreciated that the individual features of the application described in the above description of the exemplary embodiments of the application are sometimes grouped together in a single embodiment, a drawing figure, or a description of a related group of embodiments, for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various aspects, features and embodiments of the application. However, this method of disclosing should not be interpreted to mean that the application requires more features than are expressly identified in each claim. Rather, it is regarded that the claims are formatted to position the features in the application so as to best explain the aspects of the application and their significant properties, and this formatting is used merely for greatest clarity when reading the claims. Thus, therefore, the following claims are hereby expressly incorporated into this detailed description of the exemplary embodiments of the present application, with each claim reading into the detailed description of the disclosed embodiments in lieu of repeating the more general description.

[0076] It should be noted that the above-mentioned embodiments illustrate rather than limit the application, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. In a claim enumerating several means, several of these means can be embodied by one and the same item of hardware. The usage of the words "first", "second" and "third", etc. do not limit the number of these elements. The use of the terms "first", "second" and "third", etc. do not limit the number of these elements. The words "first", "second", and "third", etc. can be construed as names.

Claims

1. A tailings treatment system, characterized in that, include: Tailings thickener and first, second, third and fourth lines for tailings transportation; The first and second lines are connected in parallel between the coarse tailings source and the feed inlet of the tailings thickener, and the third and fourth lines are connected in parallel between the discharge outlet of the tailings thickener and the underground filling system. A first valve is installed on the first line; A second valve and a first sand dredging machine are installed on the second line; A third valve and a second sand dredging machine are installed on the third line; A fourth valve is installed on the fourth line.

2. The tailings treatment system as described in claim 1, characterized in that, It also includes a fifth line, which is located between the magnetic separation tailings source and the feed inlet of the tailings thickener.

3. The tailings treatment system as described in claim 1, characterized in that, It also includes a first slurry pump, which is installed on the second line and located between the second valve and the feed inlet of the first sand dredging machine.

4. The tailings treatment system as described in claim 1, characterized in that, It also includes a second slurry pump, which is installed on the third line and located between the third valve and the feed inlet of the second sand dredging machine.

5. The tailings treatment system as described in claim 1, characterized in that, The first sand dredging machine is a coarse sand dredging machine, and the second sand dredging machine is a fine sand dredging machine.

6. The tailings treatment system as described in claim 1, characterized in that, The downhole filling system is equipped with a level gauge.

7. A method for tailings treatment using the tailings treatment system according to any one of claims 1 to 6, characterized in that, include: When the tailings volume is less than the filling requirement, the second valve and the third valve are closed, and the first valve and the fourth valve are opened. The concentrated tailings obtained by the tailings thickener are sent to the underground filling system for tailings filling through the fourth line. When the tailings volume exceeds the filling requirement, the first valve and the third valve are closed, and the second valve and the fourth valve are opened. The coarse tailings are sent to the first sand dredging machine to dredge construction sand. The tailings obtained are sent to the tailings thickener for thickening, and then sent to the underground filling system for tailings filling through the fourth line. Alternatively, when the tailings volume exceeds the filling requirement, the first valve and the third valve are opened, and the second valve and the fourth valve are closed. The concentrated tailings are sent to the second sand dredging machine to dredge construction sand, and the resulting tailings are sent to the underground filling system through the fourth line for tailings filling. Alternatively, when the tailings quantity exceeds the filling requirement, the first valve and the fourth valve are closed, and the second valve and the third valve are opened. The coarse tailings are sent to the first sand dredging machine to dredge construction sand once. The resulting tailings are then sent to the tailings thickener for thickening, and then sent to the second sand dredging machine to dredge construction sand a second time. The resulting tailings are then sent to the underground filling system for tailings filling.

8. The method as described in claim 7, characterized in that, Also includes: The relationship between the tailings volume and the filling demand is determined by the liquid level in the downhole filling system.

9. An ore processing system, characterized in that, It includes a dry separator, a first magnetic separator, and a tailings treatment system. The discharge port of the dry separator is connected to the feed port of the first magnetic separator. The waste outlet of the first magnetic separator forms a coarse tailings source. The tailings treatment system includes a tailings thickener and a first line, a second line, a third line, and a fourth line for tailings transportation. The first line and the second line are connected in parallel between the coarse tailings source and the inlet of the tailings thickener, and the third line and the fourth line are connected in parallel between the outlet of the tailings thickener and the underground filling system. A first valve is installed on the first line; a second valve and a first sand dredging machine are installed on the second line; a third valve and a second sand dredging machine are installed on the third line; and a fourth valve is installed on the fourth line.

10. The ore processing system as described in claim 9, characterized in that, It also includes a ball mill, a hydrocyclone, and a second magnetic separator; the feed inlet of the ball mill is connected to the screening outlet of the first magnetic separator; the feed pipe of the hydrocyclone is connected to the discharge outlet of the ball mill, and the underflow pipe of the hydrocyclone is connected to the feed inlet of the ball mill; the feed inlet of the second magnetic separator is connected to the overflow pipe of the hydrocyclone, and the waste outlet of the second magnetic separator forms a magnetic tailings source; a fifth line is provided between the magnetic tailings source and the feed inlet of the tailings thickener.

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