System for recycling production water of dressing plant

Abstract

The invention belongs to the technical field of ore dressing plant recycling and reusing, and relates to an ore dressing plant production water recycling and reusing system which comprises a first-section grinding plant, a second-section grinding plant, an iron filtering plant and a 65-meter thickener, the 65-meter thickener is used for collecting magnetic separation tailings, underflow of the 65-meter thickener provides raw materials for a mixed flotation machine, and overflow water enters a 53-meter thickener; the 65m thickener is used for concentrating magnetic separation tailings and then supplying the magnetic separation tailings to a mixed flotation machine; the 53m thickener is used for collecting wastewater, and the bottom of the 53m thickener provides part of tailing raw materials for the filling thickener; the upper part of the filling thickener provides overflow water for the 53m thickener; the collecting water tank is used for receiving overflow water of the 53m thickener; the high-level water tank receives water pumped by the collecting water tank and supplies water to the first-section grinding plant, the second-section grinding plant and the iron filtering plant. According to the dressing plant production water recycling system, the use amount of fresh water is reduced, wastewater discharge is reduced, the environment is protected, and maximum utilization of resources is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of recycling and reuse of ore dressing plants, and relates to a system for recycling and reuse of produced water of ore dressing plants. Background Art

[0002] The mineral processing production process consumes a lot of water. If the generated mineral processing wastewater is directly discharged, it will not only cause a waste of resources, but also pollute the environment, which does not meet the requirements of green mine construction. Realizing the closed-loop circulation of wastewater is not only a requirement of environmental protection policy, but also an inherent requirement to reduce the cost of mineral processing water and improve the efficiency of separation. As one of the main sources of water for mineral processing, the efficient clarification and recycling of circulating water is the basis for the normal operation of the entire mineral processing process.

[0003] The production water of the mining concentrator is also recycled and reused, with a production scale of 3 million t / a. The crushing adopts a three-stage one-closed circuit, the grinding and flotation adopts a magnetic first and then flotation process, the magnetic separation is a conventional two-stage closed-circuit grinding, and the step grinding and step selection process. The main products are iron concentrate with a grade of more than 65%, sulfur concentrate with a grade of more than 45%, and copper concentrate with a grade of more than 18%. The tailings of the magnetic separation are concentrated by a 65-meter thickener and then supplied to the mixed flotation machine for copper and sulfur separation. The production water is collected and collected in the pool (the design capacity of the pool is 2000m3) at the overflow of the 65-meter thickener, and then pumped to the high-level pool (the design capacity of the high-level pool is 6000m3+6000m3) by a water pump, and then flows from the high-level pool to each process point. However, in the daily production process, some production water will still be lost from different process points, resulting in an increase in the water transfer cost of the concentrator. Summary of the invention

[0004] The present application provides a system for recycling and reusing produced water in a mineral processing plant, which utilizes a 53-meter thickener to realize closed-loop circulation of produced water in the mineral processing process.

[0005] In order to achieve the above technical purpose, the technical solution adopted by this application is that the mineral processing plant production water recycling and reuse system includes:

[0006] The first grinding plant is used for primary grinding. The magnetic separation tailings produced enter the 65-meter thickener for recovering copper-sulfur concentrate;

[0007] The second-stage mill is used for secondary grinding. The magnetic tailings produced enter the 65-meter thickener for recovering copper-sulfur concentrate;

[0008] The iron filtration plant is equipped with a filter to concentrate the concentrate treated by the thickening magnetic separator. The concentrated tailings are collected in a 53-meter thickener;

[0009] The 65-meter thickener is used to collect the magnetic tailings produced by the first and second stage grinding. Its underflow provides raw materials for the mixed flotation machine for selecting copper-sulfur concentrate; its overflow water enters the 53-meter thickener for centralized recovery;

[0010] Mixed flotation machine, 65m thickener thickens the magnetic separation tailings and supplies them to the mixed flotation machine for copper-sulfur concentrate separation;

[0011] 53m thickener, used to collect wastewater produced by the first and second mills and iron filtration plants, and its bottom provides some tailings raw materials for filling the thickener;

[0012] A filling thickener receives part of the tailings raw materials provided by the 53-meter thickener, and at the same time, its upper part provides overflow water of the filling thickener to the 53-meter thickener;

[0013] A collection tank to receive overflow water from the 53-meter thickener;

[0014] The high-level water tank receives the water pumped into the collection tank and supplies water to the first-stage mill building, the second-stage mill building and the iron filtration building.

[0015] As an improved technical solution of the present application, the installation position of the first-stage mill building is higher than that of the second-stage mill building, and the height difference between the two is not less than 4 meters; the installation position of the second-stage mill building is higher than that of the iron filtration building, and the height difference between the two is not less than 14 meters.

[0016] As an improved technical solution of the present application, the collection pool is connected to the upper part of the 53-meter thickener through a 53-meter overflow water pipe.

[0017] As an improved technical solution of the present application, it also includes a flocculant device and a flocculant feeding pipe. The flocculant device is installed above the 53-meter thickener and is connected to the 53-meter thickener through the flocculant feeding pipe.

[0018] As an improved technical solution of the present application, a 65-meter underflow pump is provided at the bottom of the 65-meter thickener, and the 65-meter underflow pump provides raw materials for the hybrid flotation machine.

[0019] As an improved technical solution of the present application, it also includes a first and second stage grinding pump channel for collecting wastewater produced by the first and second stage grinding plants, and a submersible pump is provided inside the channel for returning the above wastewater to an external pump pool; a drainage ditch is provided on the inner side of the first and second stage grinding pump channel for discharging excess wastewater, and the ditch water in the drainage ditch is ultimately designed to be recycled to a 53-meter thickener.

[0020] As an improved technical solution of the present application, a chute is provided outside the iron filtration plant for recovering the tailings water in the iron filtration plant and the overflow water of the filling thickener; at the same time, the tailings water in the iron filtration plant and the overflow water of the filling thickener are both led into the chute based on pipes; the water recovered by the chute is self-drained by height difference to achieve gravity.

[0021] As an improved technical solution of the present application, the first-stage grinding plant, the second-stage grinding plant, the first and second-stage grinding pump channels, the iron filtration plant, and the mixed flotation machine are concentrated in a main plant, and the process is arranged in a stepped manner; trenches and chutes are arranged on both sides of the main plant.

[0022] Beneficial Effects

[0023] 1. After the system was put into use, the production water was basically fully recycled and reused. Specifically, it is energy-saving and consumption-reducing: not only the process water is recycled and reused, but also the production water of other process points is recycled nearby, reducing the water supply cost. The production water of other process points was originally supplied by the three-stage pump, and the water supply cost was about 1 yuan / cubic meter. Now the water is supplied at the bottom of the 65-meter thickener, and the water supply cost is about 0.5 yuan / cubic meter.

[0024] 2. This system is designed to purify and reuse the circulating water, and to purify the used production water through centralized sedimentation through a 53-meter thickener so that it can be used again in all processes such as crushing and grinding, flotation, etc.

[0025] 3. By recycling and reusing production water, the system can reduce the demand for fresh water in the ore dressing plant, thereby reducing the cost of purchasing or pumping new water. In the early stage, the three-stage pump also needs to be replenished with new water.

[0026] 4. After this system is put into use, the discharge of industrial wastewater can be reduced, thereby reducing the impact on the surrounding ecological environment.

[0027] 5. After the system is put into use, the production water is basically fully recycled and reused. Specifically, it saves energy and reduces consumption: not only the water used in the process is recycled and reused, but also the production water of other process points is recycled nearby, reducing the water supply cost. The cost of recycling water nearby is half of the cost of the original method.

[0028] 6. After this system is put into use, the amount of sewage that needs to be treated and discharged is reduced, thereby reducing the operating and maintenance costs of sewage treatment facilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram showing the structure of the system of the present application is shown;

[0030] In the figure, 1. First-stage grinding mill building; 2. Second-stage grinding mill building; 3. First- and second-stage grinding pump channels; 4. Iron filtration building; 5. Filling thickener overflow water; 6. 65-meter thickener; 7. 65-meter underflow pump; 8. Mixing flotation machine; 9. 65-meter overflow pipe; 10. 53-meter thickener; 11. 53-meter underflow pump; 12. Filling or filter press device; 13. 53-meter overflow pipe; 14. Collecting pool; 15. High-pressure water pump; 16. High-level pool; 17. High-level pool drainage pipe; 18. Flocculant device; 19. Flocculant addition pipe. DETAILED DESCRIPTION

[0031] Definition: The high position of the high-level water tank refers to a position 25 meters higher than the first-stage grinding plant.

[0032] like Figure 1 As shown, the mineral processing plant production water recovery and reuse system mainly includes a first-stage grinding plant 1, a second-stage grinding plant 2, a first and second-stage grinding pump channel 3, an iron filtering plant 4, a filling thickener overflow water 5, a 65-meter thickener 6, a 65-meter underflow pump 7, a mixed flotation machine 8, a 65-meter overflow water pipe 9, a 53-meter thickener 10, a 53-meter underflow pump 11, a filling or filter press device 12, a 53-meter overflow water pipe 13, a collecting pool 14, a high-pressure water pump 15, a high-level water pool 16, a high-level water pool drainage pipe 17, a flocculant device 18, and a flocculant addition pipe 19.

[0033] Among them, the first-stage mill building 1 is used for primary grinding, and the magnetic separation tailings produced enter the 65-meter thickener 6 for recovering copper-sulfur concentrate;

[0034] Secondary mill building 2 is used for secondary grinding. The magnetic separation tailings produced enter the 65-meter thickener 6 for recovering copper-sulfur concentrate;

[0035] The iron filtration plant 4 is equipped with a filter to concentrate the concentrate treated by the concentration magnetic separator, and the concentrated tailings are centrally recovered in the 53-meter thickener 10; a chute is provided outside the iron filtration plant to recover the tailings water in the iron filtration plant 4 and the overflow water 5 of the filling thickener (filling device overflow water); at the same time, the tailings water in the iron filtration plant and the overflow water 5 of the filling thickener are both led to the chute based on pipelines; the water recovered by the chute is self-drained by height difference to achieve gravity;

[0036] The 65-meter thickener 6 is used to collect the magnetic tailings produced by the first and second stage grinding. Its underflow provides raw materials for the mixed flotation machine 8 for separating copper-sulfur concentrate; its overflow water enters the 53-meter thickener 10 for centralized recovery;

[0037] A 65-meter underflow pump 7 is provided at the bottom of the mixed flotation machine 8 and the 65-meter thickener 6. The 65-meter underflow pump 7 provides raw materials for the mixed flotation machine 8 to concentrate the magnetic separation tailings and then supply them to the mixed flotation machine for copper-sulfur concentrate separation;

[0038] 53m thickener 10, used to collect wastewater produced by the first and second mill buildings 1 and 2 and the iron filtration building 4, and its bottom provides part of the tailings raw material for filling the thickener;

[0039] A filling thickener receives part of the tailings raw materials provided by the 53-meter thickener, and at the same time, its upper part provides overflow water of the filling thickener to the 53-meter thickener 10;

[0040] A collecting pool 14, wherein the collecting pool 14 is connected to the upper part of the 53-meter thickener 10 through a 53-meter overflow pipe 13, and receives overflow water from the 53-meter thickener 10;

[0041] The high-level water tank 15 receives the water pumped into the collection tank 14 and supplies water to the first-stage mill building 1, the second-stage mill building 2 and the iron filtering building 4;

[0042] It also includes a first and second stage grinding pump channel 3, which is used to collect the wastewater produced by the first stage grinding plant 1 and the second stage grinding plant 2. A submersible pump is arranged inside the channel to return the above wastewater to the external pump pool. A drainage ditch is arranged inside the first and second stage grinding pump channel 3 to discharge the excess wastewater into the ditch outside the plant. The ditch water is finally designed to be recycled to the 53-meter thickener.

[0043] Among them, in order to ensure gravity flow, the installation position of the first-stage mill building is higher than that of the second-stage mill building, and the height difference between the two is not less than 4 meters; the installation position of the second-stage mill building is higher than the iron filtration building, and the height difference between the two is not less than 14 meters.

[0044] As an improved technical solution of the present application, it also includes a flocculant device and a flocculant feeding pipe. The flocculant device is installed above the 53-meter thickener and is connected to the 53-meter thickener through the flocculant feeding pipe.

[0045] Specifically, the first-stage mill building 1, the second-stage mill building 2, the first and second-stage grinding pump channels 3, the iron filtration building 4, and the mixed flotation machine 8 are concentrated in a main building, and the process is arranged in a stepped manner. The absolute elevation of the first-stage mill building 1 is 90.8 meters, and the absolute elevation of the second-stage mill building 2 is 86.4 meters; the absolute elevation of the first and second-stage grinding pump channels 3 is 81.2 meters, the absolute elevation of the iron filtration building 4 is 66.8 meters, and the absolute elevation of the mixed flotation machine 8 is 82.3 meters. Ditches and chutes are arranged on both sides of the main building; the first-stage mill building 1 and the second-stage mill building 2 produce The raw industrial wastewater is discharged into the first and second stage grinding pump channel 3; there are multiple sand pumps and submersible pumps in the first and second stage grinding pump channel 3, and a ditch is provided on the inner side of the first and second stage grinding pump channel 3; the production wastewater generated by the first and second stage grinding pump channel 3 will be recovered by the submersible pump together with the industrial wastewater generated by the first and second stage grinding mill buildings 1 and 2, and returned to the production process, but there is still a part of the wastewater that cannot be fully recovered. At this time, it is discharged into the ditch on both sides of the main factory building through the ditch (drainage ditch) inside the first and second stage grinding pump channel 3, and this ditch extends to the pre-buried chute in front of the 53-meter thickener 10. There are 8 filters in the iron filtration building 4. The method to increase the concentration of the filter is to add a thickening magnetic separator before feeding. The tailings water produced by the thickening magnetic separator is introduced into the chute on the other side of the main building through a pipe for recovery. The filling thickener overflow water 5 has an absolute elevation of 118.4 meters. It flows by pipe to the chute next to the iron filtration building 4 (the main building is located in the chute next to the iron filtration building 4), and is combined with the tailings water produced by the thickening magnetic separator in the iron filtration building 4. This chute extends to the pre-buried chute in front of the 53-meter thickener, and is finally combined with the ditch on the other side of the main building, and enters the 53-meter thickener 10.

[0046] A process flow of a production water recycling and reuse system of a mineral processing plant is as follows: the magnetically separated tailings enter a 65-meter thickener 6, and after the underflow is concentrated, it is pumped to a mixed flotation machine 8 through a 65-meter underflow pump 7 for copper and sulfur separation operations; the 65-meter overflow water enters the overflow weir of the 65-meter thickener, and then enters the 53-meter thickener 10 through a 65-meter overflow pipe 9, and after the underflow of the 53-meter thickener 10 is concentrated, it is pumped to a filling or filter press device 12 through a 53-meter underflow pump 11 for tailings treatment; the 53-meter overflow water enters the overflow weir of the 53-meter thickener, and then overflows to a collecting pool 14 through a 53-meter overflow pipe 13; the production water in the collecting pool 14 is pumped to a high-level water pool 16 through a high-pressure water pump 15, and then flows by gravity to various production process points through a drainage pipe 17 from the high-level water pool. The flocculant device 18 enters the central part of the 53-meter thickener 10 through the flocculant feeding pipe 19 and is used to settle all suspended particles entering the 53-meter thickener 10.

[0047] All the water used in the process and the height difference drainage are centrally treated, recycled and reused by the 53-meter thickener 10.

[0048] The operating principle of this application is as follows:

[0049] Use height difference for drainage: the production wastewater (mainly water for flushing the site) generated by the first-stage grinding mill 1 and the second-stage grinding mill 2 will flow to the first-stage and second-stage grinding pump channel 3. There are multiple sand pumps at the bottom of the first-stage and second-stage grinding pump channel 3. The water seal water, accident water and site cleaning water generated by them will be collected in the first-stage and second-stage grinding pump channel 3. The first-stage and second-stage grinding pump channel 3 is equipped with a submersible pump to return the above wastewater to the required pump pool, but it is impossible to achieve full recovery. A drainage ditch is provided on the inside of the first-stage and second-stage grinding pump channel 3 to discharge excess wastewater and prevent the first-stage and second-stage grinding pump channel 3 from being flooded, causing equipment accidents. This part of the production water cannot enter the 65-meter thickener 6 with the magnetic separation tailings, so the recovery problem must be considered. This method uses a chute to collect this part of the production wastewater in a centralized manner.

[0050] There are 8 filters in the iron filtration plant 4. The method to increase the concentration of the filter is to add a thickening magnetic separator before feeding. The tailings water produced by the thickening magnetic separator needs to be recycled. This method uses a chute to collect this part of the production wastewater in a centralized manner.

[0051] The overflow water 5 of the filling thickener flows by gravity to the chute beside the iron filtration plant 4 through a pipeline and is collected together with the wastewater from the thickening magnetic separator.

[0052] The above description is the main production wastewater needed, and there is another part that is fully expressed, such as other high-point factory washing water, road washing water, wheel washing machine wastewater, etc.

[0053] Water for process:

[0054] The tailings from magnetic separation enter the 65-meter thickener 6, and after the bottom flow is concentrated, it is pumped to the mixed flotation machine 8 through the 65-meter bottom flow pump 7 for copper and sulfur separation; the 65-meter overflow water enters the overflow weir of the 65-meter thickener, and then enters the 53-meter thickener 10 through the 65-meter overflow pipe 9; after the bottom flow of the 53-meter thickener 10 is concentrated, it is pumped to the filling or filter press device 12 for tailings treatment through the 53-meter bottom flow pump 11; the 53-meter overflow water enters the overflow weir of the 53-meter thickener, and then overflows to the collection pool 14 through the 53-meter overflow pipe 13; the production water in the collection pool 14 is pumped to the high-level water pool 16 through the high-level water pool downpipe 17 and flows to various production process points by gravity. The flocculant device 18 enters the central part of the 53-meter thickener 10 through the flocculant feeding pipe 19, which is used to settle all suspended particles entering the 53-meter thickener 10.

[0055] Description of individual processes:

[0056] 1. This system uses the advantages of the plant itself and the height difference to collect the drainage in a centralized manner; the absolute elevations of each plant are as follows: first-stage grinding plant 1: 90.8m; second-stage grinding plant 2: 86.4m; first and second-stage grinding pump channels: 81.2m; iron filter plant 4: 66.8m; filling thickener: 118.4m; 65m thickener overflow weir 10: 60.4m; 53m thickener 12 center: 58.1m; 53m thickener overflow weir 16: 55.9m; collection pool 20: 47.6m; high-level pool 21: 115m;

[0057] 2. The 65-meter overflow water pipe 9 enters the center of the 53-meter thickener 10, and its slope ratio shall not be less than 3%. The slope ratio adopted in this method is 4%.

[0058] 3. The 53-meter overflow pipe 13 enters the collection pool 14, and its slope ratio shall not be less than 3%. The slope ratio adopted in this method is 4%.

[0059] 4. Whether the flocculant device 18 is activated depends on whether the 53-meter overflow water (53-meter thickener overflow water) is turbid. When the 53-meter overflow water is found to be turbid, it should be activated. If it is not turbid, it does not need to be activated to avoid waste.

[0060] 5. The overflow water treated with flocculants has no impact on production indicators after production use.

[0061] 6. There are two main ways to dispose of tailings. One is tailings filling, so a filling device is designed, and the other is tailings filtration, so a filter press device is designed. Tailings filling is the main method in daily life, and tailings filtration can be used as an alternative; the filling device and the filter press device together form the filling or filter press device 12 mentioned above.

Claims

1. The ore dressing plant production water recycling system is characterized by: It includes a mill building for primary grinding, where the magnetic tailings are fed into a 65-meter thickener for recovering copper-sulfur concentrate; The second-stage mill is used for secondary grinding. The magnetic tailings produced enter the 65-meter thickener for recovering copper-sulfur concentrate; The iron filtration plant is equipped with a filter to concentrate the concentrate treated by the thickening magnetic separator. The concentrated tailings are collected in a 53-meter thickener; The 65-meter thickener is used to collect the magnetic tailings produced by the first and second stage grinding. Its underflow provides raw materials for the mixed flotation machine for selecting copper-sulfur concentrate; its overflow water enters the 53-meter thickener for centralized recovery; Mixed flotation machine, 65m thickener thickens the magnetic separation tailings and supplies them to the mixed flotation machine for copper-sulfur concentrate separation; 53m thickener, used to collect wastewater produced by the first and second mills and iron filtration plants, and its bottom provides some tailings raw materials for filling the thickener; A filling thickener receives part of the tailings raw materials provided by the 53-meter thickener, and at the same time, its upper part provides overflow water of the filling thickener to the 53-meter thickener; A collection tank to receive overflow water from the 53-meter thickener; The high-level water tank receives the water pumped into the collection tank and supplies water to the first-stage mill building, the second-stage mill building and the iron filtration building.

2. The ore dressing plant production water recovery and reuse system according to claim 1, characterized in that: The installation position of the first-stage mill building is higher than that of the second-stage mill building, and the height difference between the two is not less than 4 meters; the installation position of the second-stage mill building is higher than that of the iron filtration building, and the height difference between the two is not less than 14 meters.

3. The ore dressing plant production water recovery and reuse system according to claim 1 is characterized in that: The collection pool is connected to the upper part of the 53-meter thickener through a 53-meter overflow pipe.

4. The ore dressing plant production water recovery and reuse system according to claim 1, characterized in that: It also includes a flocculant device and a flocculant feeding pipe. The flocculant device is installed above the 53-meter thickener and is connected to the 53-meter thickener through the flocculant feeding pipe.

5. The ore dressing plant production water recovery and reuse system according to claim 1, characterized in that: A 65-meter underflow pump is arranged at the bottom of the 65-meter thickener, and the 65-meter underflow pump provides raw materials for the hybrid flotation machine.

6. The ore dressing plant production water recycling system according to claim 1, characterized in that: It also includes a two-stage grinding pump channel for collecting wastewater produced by the first-stage grinding plant and the second-stage grinding plant, and a submersible pump is provided inside the channel for returning the wastewater to the external pump pool; Drainage ditches are provided inside the first and second sections of the abrasive pump channel to discharge excess waste water. The ditch water in the drainage ditch is ultimately designed to be recycled to the 53-meter thickener.

7. The ore dressing plant production water recovery and reuse system according to claim 1, characterized in that: A chute is provided outside the iron filtration plant for recovering tailings water in the iron filtration plant and overflow water from the filling thickener; at the same time, the tailings water in the iron filtration plant and the overflow water from the filling thickener are led into the chute based on pipelines; the water recovered by the chute is self-drained by height difference to achieve gravity flow.

8. The ore dressing plant production water recovery and reuse system according to claim 1, characterized in that: The first-stage grinding plant, the second-stage grinding plant, the first and second-stage grinding pump channels, the iron filtration plant, and the mixed flotation machine are concentrated in a main plant, and the process is arranged in a stepped manner; trenches and chutes are arranged on both sides of the main plant.

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