Four-stage concentration and recovery treatment system and recovery treatment method for slime water

Abstract

The invention provides a slime water four-stage concentration recovery treatment system and a recovery treatment method. An inlet of a deep cone thickener is a flotation inlet, an underflow port of the deep cone thickener is communicated with an inlet of a high-frequency screen, and an overflow port of the deep cone thickener is communicated with an inlet of a first-stage thickener for first-stage precipitation and concentration; an underflow port of the concentration cyclone is communicated with an inlet of the high-frequency sieve, an overflow port of the cyclone concentrator is communicated with the medium gangue magnetic tail barrel, and the concentration cyclone is used for secondary precipitation and concentration; an underflow port of the high-frequency sieve is communicated with an inlet of a middling coal centrifuge; an overflow port of the middling coal centrifuge is communicated with a middling gangue magnetic tail barrel; an underflow port of the first-stage thickener is communicated with a coal slime recleaning system, an overflow port of the first-stage thickener is communicated with an inlet of the second-stage thickener, and the first-stage thickener is used for third-time sedimentation and concentration; an underflow port of the second-stage thickener is communicated with the circulating water system, an overflow port of the second-stage thickener is communicated with an inlet of the coal slime filter press, and the second-stage thickener is used for fourth precipitation and concentration. The system solves a series of problems caused by traditional two-stage concentration.

Description

Technical Field

[0001] The invention relates to the technical field of coal slime water recovery and treatment, and in particular to a coal slime water four-stage concentration recovery and treatment system and a recovery and treatment method. Background Art

[0002] like Figure 1 As shown, in recent years, the existing technology of newly built heavy medium coal preparation plant coal slime water treatment system generally adopts secondary sedimentation and secondary (stage) concentration and recovery treatment process. After the coal slime water (flotation tailings) is naturally settled and concentrated by the first stage concentrator (24-meter concentrator), the bottom flow is dehydrated by the high-frequency screen and the medium coal horizontal centrifuge and recovered as medium coal products. The overflow enters the second stage concentrator (38-meter concentrator), precipitates and concentrates, and the bottom flow of the second stage concentrator (38-meter concentrator) becomes the filter press coal slime product after being dehydrated by the filter press, and the overflow is used as production water for recycling. Due to the insufficient processing capacity of the first stage concentrator (24-meter concentrator) in the secondary concentration and recovery treatment process. The first stage concentrator (24-meter concentrator) often has "rake pressure" and bottom flow pipeline blockage accidents. After the accident, the only way to deal with it is to shut down the machine, and the accident handling is difficult and the dredging time is long. Each time the bottom flow pipeline is dredged, the impact time is more than 2 hours, which seriously affects the normal production time.

[0003] In addition, due to the large amount of materials entering the first stage thickener (24-meter thickener), the first stage thickener (24-meter thickener) has relatively insufficient cutting and processing capacity, which makes the first stage thickener (24-meter thickener) run at a high level for a long time. Some materials that should have been recycled into the medium coal with the first stage underflow "ran" into the second stage thickener (38-meter thickener), resulting in an increase in the output of filter press slime. This not only affects the economic benefits, but also increases the risks and pressures of subsequent environmental protection control.

[0004] In order to solve the above problems, people have been seeking an ideal technical solution. Summary of the invention

[0005] The purpose of the present invention is to address the deficiencies in the prior art and to provide a four-stage coal slime water concentration and recovery treatment system that solves a series of problems brought about by the traditional two-stage concentration, such as high pressure in the first-stage concentrator, frequent rake pressure problems, easy blockage of the underflow pipeline, low output of medium coal, and high output of coal slime.

[0006] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present invention is: a four-stage concentrating and recycling system for coal sludge water, including a deep cone concentrator, a concentrating cyclone, a high-frequency screen, a primary concentrator, a secondary concentrator, a coal sludge filter press, a medium coal centrifuge and a medium gangue magnetic tail bucket;

[0007] The inlet of the deep cone concentrator is a flotation inlet, the underflow port of the deep cone concentrator is connected to the high-frequency screen inlet, the overflow port of the deep cone concentrator is connected to the inlet of the primary concentrator, and the deep cone concentrator is used for primary precipitation and concentration of coarse particle materials;

[0008] The bottom flow port of the concentrating cyclone is connected to the inlet of the high-frequency screen, and the overflow port of the cyclone concentrator is connected to the magnetic tail bucket of the middle gangue. The concentrating cyclone is used for secondary precipitation and concentration;

[0009] The bottom flow port of the high-frequency screen is connected to the inlet of the medium coal centrifuge, and the overflow port of the medium coal centrifuge is connected to the medium gangue magnetic tail bucket;

[0010] The underflow port of the primary concentrator is connected to the coal slime reselection system, and the overflow port of the primary concentrator is connected to the inlet of the secondary concentrator. The primary concentrator is used for tertiary precipitation and concentration;

[0011] The underflow port of the secondary concentrator is connected to a circulating water system, the overflow port of the secondary concentrator is connected to an inlet of a coal slime filter press, and the secondary concentrator is used for four-time precipitation and concentration.

[0012] Based on the above, the output end of the middle gangue magnetic tail barrel is connected to the inlet of the deep cone concentrator.

[0013] Based on the above, the overflow port of the coal slime filter press is connected to the inlet of the secondary concentrator.

[0014] Based on the above, the first-stage concentrator is a 24-meter concentrator.

[0015] Based on the above, the secondary concentrator is a 38-meter concentrator.

[0016] Based on the above, the model specification of the deep cone concentrator is φ15m and the cone angle is 64.5°.

[0017] Based on the above, the deep-layer distributor of the deep cone concentrator adopts a double-layer high-efficiency distributor with a processing capacity of ≥2400m 3 / h.

[0018] A method for four-stage concentration and recovery of coal slime water comprises the following steps:

[0019] Coal slurry enters the deep cone thickener and uses ≥2400m 3 / h processing flow, high-efficiency, large-flow primary sedimentation and concentration of coal slurry water, reducing the content of coarse particles in overflow;

[0020] The bottom flow of the deep cone thickener enters the thickening cyclone for secondary sedimentation and concentration, increasing the concentration of the coal slime water entering the high-frequency screen;

[0021] The bottom flow of the concentrating cyclone enters the high-frequency screen, and after being processed by the high-frequency screen, enters the medium coal centrifuge to output the medium coal product;

[0022] The overflow after rough treatment by the deep cone concentrator enters the primary concentrator for three sedimentation and concentration. The overflow of the primary concentrator enters the secondary concentrator for four sedimentation and concentration, and then enters the coal slime filter press to output the filter-pressed coal slime product.

[0023] Based on the above, the overflow of the concentrating cyclone, high-frequency screen and medium coal centrifuge enters the medium gangue magnetic tail barrel, and then is output from the medium gangue magnetic tail barrel to the deep cone concentrator.

[0024] Compared with the prior art, the present invention has outstanding substantive features and remarkable progress. Specifically, on the basis of the traditional two-stage concentration, the present invention adds a set of deep cone concentrators in front of the first-stage concentrator, and utilizes the advantages of large processing capacity and high efficiency of the deep cone concentrator to relieve the pressure of the original first-stage concentrator, so that the coarse particle materials entering the first-stage concentrator are significantly reduced, and the material levels of the first-stage and second-stage concentrators drop sharply, thereby ensuring the smooth and normal operation of the first-stage and second-stage concentrators, and solving a series of problems in the traditional two-stage concentration process, such as poor coarse cutting effect, insufficient processing capacity, and overflow and easy coarse running of the first-stage concentrator, and completely avoiding the occurrence of "rake pressure" and bottom flow pipeline blockage accidents during the operation of the 24-meter concentrator, and effectively improving production efficiency.

[0025] The introduced deep cone concentrator is combined with a concentrating cyclone and a high-frequency screen to maintain a high concentration of the processed material before entering the high-frequency screen, ensuring that the concentration of the material entering the high-frequency screen is "not thin" and the material discharged is "not watery", thereby improving the quality and output of medium coal products; at the same time, it reduces the pipeline pressure of the bottom flow of the deep cone concentrator, allowing the deep cone concentrator to operate smoothly.

[0026] In general, the present invention introduces a deep cone concentrator for pre-treatment and a concentrating cyclone to improve the quality and yield of medium coal. Compared with the traditional two-stage concentration, it actually completes the four-stage concentration, making the step-by-step recovery process of coal slime water more scientific, achieving the effect of collecting all materials, reducing coal slime in stages, and accurately recovering products. It effectively improves the output of medium coal and reduces the output of coal slime, highlighting the economic and environmental benefits.

[0027] Moreover, this solution is particularly suitable for the transformation and upgrading of traditional concentration processes. It only requires the installation of deep cone concentrators and concentrating cyclones in front of traditional primary concentrators and high-frequency screens, and the re-planning of part of the pipeline route. The transformation is easy and suitable for upgrading old production lines. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural principle diagram of a two-stage concentration system in the prior art.

[0029] Figure 2It is a schematic diagram of the four-stage concentration and recovery treatment system of coal sludge water in the present invention. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is further described in detail below through specific implementation methods.

[0031] like Figure 2 As shown, a four-stage concentrating and recycling system for coal sludge water includes a deep cone concentrator, a concentrating cyclone, a high-frequency screen, a primary concentrator, a secondary concentrator, a coal sludge filter press, a medium coal centrifuge and a medium gangue magnetic tail barrel; in this embodiment, the primary concentrator is a 24-meter concentrator and the secondary concentrator is a 38-meter concentrator.

[0032] The inlet of the deep cone concentrator is a flotation inlet, the bottom flow port of the deep cone concentrator is connected to the high-frequency screen inlet, and the overflow port of the deep cone concentrator is connected to the inlet of the primary concentrator. The deep cone concentrator is used for primary precipitation and concentration of coarse particle materials. In this embodiment, the model specification of the deep cone concentrator is φ15m, the cone angle is 64.5°, and the deep layer distributor of the deep cone concentrator adopts a double-layer high-efficiency distributor with a processing capacity of ≥2400m 3 / h.

[0033] In this embodiment, the core purpose of the newly added deep cone concentrator is to alleviate the processing pressure of the traditional first-stage concentrator, and use its large flow processing characteristics to perform preliminary processing on coarser materials, so that the material entering the traditional 24-meter concentrator and 38-meter concentrator is significantly reduced, thereby avoiding a series of problems faced by the 24-meter concentrator in the traditional solution.

[0034] The bottom flow port of the concentrating cyclone is connected to the inlet of the high-frequency screen, and the overflow port of the cyclone concentrator is connected to the magnetic tail bucket of the middle gangue. The concentrating cyclone is used for secondary precipitation and concentration;

[0035] The core purpose of the newly added concentrator is to be used in conjunction with the deep cone concentrator. Due to the large flow rate and high processing efficiency of the deep cone concentrator, the bottom flow often contains a lot of water. The high-efficiency concentrating effect of the concentrator can be used to maintain a high concentration of the material entering the high-frequency screen, ensuring that the concentration of the high-frequency screen is not "thin" and the discharge is "not too watery". At the same time, due to its high efficiency, it can reduce the pressure of the bottom flow pipeline of the deep cone concentrator and make the deep cone concentrator run smoothly.

[0036] The bottom flow port of the high-frequency screen is connected to the inlet of the medium coal centrifuge, and the overflow port of the medium coal centrifuge is connected to the medium gangue magnetic tail barrel; the output end of the medium gangue magnetic tail barrel is connected to the inlet of the deep cone concentrator.

[0037] The underflow port of the primary concentrator is connected to the coal slime reselection system, and the overflow port of the primary concentrator is connected to the inlet of the secondary concentrator. The primary concentrator is used for tertiary precipitation and concentration;

[0038] The underflow port of the secondary concentrator is connected to the circulating water system, the overflow port of the secondary concentrator is connected to the inlet of the coal slime filter press, the secondary concentrator is used for four precipitation and concentration, and the overflow port of the coal slime filter press is connected to the inlet of the secondary concentrator.

[0039] The method for four-stage concentration and recovery treatment of coal sludge water using the above-mentioned four-stage concentration and recovery treatment system comprises the following steps:

[0040] Coal slurry enters the deep cone thickener and uses ≥2400m 3 / h processing flow, high-efficiency, large-flow primary sedimentation and concentration of coal slurry water, reducing the content of coarse particles in overflow;

[0041] The bottom flow of the deep cone thickener enters the thickening cyclone for secondary sedimentation and concentration, increasing the concentration of the coal slime water entering the high-frequency screen;

[0042] The bottom flow of the concentrating cyclone enters the high-frequency screen, and after being processed by the high-frequency screen, enters the medium coal centrifuge to output the medium coal product;

[0043] The overflow after rough treatment by the deep cone concentrator enters the primary concentrator for three sedimentation and concentration. The overflow of the primary concentrator enters the secondary concentrator for four sedimentation and concentration, and then enters the coal slime filter press to output the filter-pressed coal slime product.

[0044] The overflow of the concentrating cyclone, high-frequency screen and medium coal centrifuge enters the medium gangue magnetic tail barrel, and then is output from the medium gangue magnetic tail barrel to the deep cone concentrator.

[0045] The four-stage coal sludge water concentration recovery treatment system provided in this embodiment and the Figure 1 The coal slime water recovery and treatment system in the prior art shown in the figure was subjected to comparative experiments. The particle size composition of the 24-meter thickener underflow of this embodiment and the prior art is shown in Tables 1 and 2, and the particle size composition of the 24-meter thickener overflow of this embodiment and the prior art is shown in Tables 3 and 4. The comparison of the yield of medium coal and filter press coal slime obtained in this embodiment and the prior art is shown in Table 5.

[0046] Table 1 Particle size composition of 24m thickener underflow in the four-stage thickening and recovery treatment system of coal sludge water provided in this embodiment

[0047]

[0048] Table 2 Underflow particle size composition of a concentrator (24m concentrator) in the prior art coal slime water recovery and treatment system

[0049]

[0050] Comparing Table 1 and Table 2, it can be seen that the content of particles above 0.125 mm in the underflow of the 24-meter thickener in this embodiment is reduced to 13.4% compared with 54.8% in the prior art. The reduction of coarse particles in the underflow of the 24-meter thickener reflects the significant coarse cutting effect of the deep cone thickener. The reduction of coarse particles entering the 24-meter thickener reduces the material processing pressure of the 24-meter thickener, promotes the normal and stable operation of the 24-meter thickener, and avoids the occurrence of "rake pressure" and underflow pipeline blockage accidents.

[0051] Table 3 The overflow particle size composition of the 24-meter thickener in the four-stage thickening and recovery treatment system of the coal sludge water provided in this embodiment

[0052]

[0053] Table 4 The overflow particle size composition of the first concentrator (24m concentrator) in the prior art coal slime water recovery and treatment system

[0054]

[0055] Comparing Table 3 and Table 4, it can be seen that the content of particles with a size of 0.125 mm or larger in the overflow of the 24-meter thickener in this embodiment is reduced from 15% in the prior art to 6.2%, a reduction of more than 50%. It can be seen that the overflow and coarseness phenomenon of the 24-meter thickener in this embodiment is significantly improved.

[0056] Table 5 Comparison of the output and yield of filter press coal slime and medium coal obtained in this embodiment and the prior art

[0057]

[0058]

[0059] It can be seen from Table 5 that after the transformation and upgrading of the coal slime water recovery process, the coal yield rate increased by 1.6%, and the coal output increased by 93,816 tons year-on-year. The coal slime yield rate decreased by 2.44%, and the coal slime output decreased by 144,342 tons year-on-year. The increase in coal output has increased the output of high value-added products; the reduction in coal slime output has alleviated the pressure on subsequent coal slime drying and sales, and the economic and environmental benefits are outstanding.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A four-stage concentration and recovery system for coal sludge water, characterized by: Including deep cone thickener, thickening cyclone, high frequency screen, primary thickener, secondary thickener, coal slime filter press, medium coal centrifuge and medium gangue magnetic tail bucket; The inlet of the deep cone concentrator is a flotation inlet, the underflow port of the deep cone concentrator is connected to the high-frequency screen inlet, the overflow port of the deep cone concentrator is connected to the inlet of the primary concentrator, and the deep cone concentrator is used for primary precipitation and concentration of coarse particle materials; The bottom flow port of the concentrating cyclone is connected to the inlet of the high-frequency screen, and the overflow port of the cyclone concentrator is connected to the magnetic tail bucket of the middle gangue. The concentrating cyclone is used for secondary precipitation and concentration; The bottom flow port of the high-frequency screen is connected to the inlet of the medium coal centrifuge, and the overflow port of the medium coal centrifuge is connected to the medium gangue magnetic tail bucket; The underflow port of the primary concentrator is connected to the coal slime reselection system, and the overflow port of the primary concentrator is connected to the inlet of the secondary concentrator. The primary concentrator is used for tertiary precipitation and concentration; The underflow port of the secondary concentrator is connected to a circulating water system, the overflow port of the secondary concentrator is connected to an inlet of a coal slime filter press, and the secondary concentrator is used for four-time precipitation and concentration.

2. The four-stage concentration and recovery treatment system for coal sludge water according to claim 1 is characterized in that: The output end of the middle gangue magnetic tail barrel is connected to the inlet of the deep cone concentrator.

3. The four-stage concentration and recovery treatment system for coal sludge water according to claim 2 is characterized in that: The overflow port of the coal slime filter press is connected to the inlet of the secondary concentrator.

4. The four-stage coal slurry concentration and recovery treatment system according to claim 1, 2 or 3, characterized in that: The first-stage concentrator is a 24-meter concentrator.

5. The four-stage concentration and recovery system for coal sludge water according to claim 1, 2 or 3, characterized in that: The secondary concentrator is a 38-meter concentrator.

6. The four-stage concentration and recovery treatment system for coal sludge water according to claim 4 is characterized in that: The secondary concentrator is a 38-meter concentrator.

7. The four-stage coal slurry concentration and recovery treatment system according to claim 1, 2, 3 or 6, characterized in that: The model specification of the deep cone concentrator is φ15m, and the cone angle is 64.5°.

8. The four-stage concentration and recovery treatment system for coal sludge water according to claim 7 is characterized in that: The deep-cone concentrator uses a double-layer high-efficiency distributor with a processing capacity of ≥2400m 3 / h.

9. A method for four-stage concentration and recovery of coal sludge water, characterized in that: The following steps are involved: Coal slurry enters the deep cone thickener and uses ≥2400 m 3 / h processing flow, high-efficiency, large-flow primary sedimentation and concentration of coal slurry water, reducing the content of coarse particles in overflow; The bottom flow of the deep cone thickener enters the thickening cyclone for secondary sedimentation and concentration, increasing the concentration of the coal slime water entering the high-frequency screen; The bottom flow of the concentrating cyclone enters the high-frequency screen, and after being processed by the high-frequency screen, enters the medium coal centrifuge to output the medium coal product; The overflow after rough treatment by the deep cone concentrator enters the primary concentrator for three sedimentation and concentration. The overflow of the primary concentrator enters the secondary concentrator for four sedimentation and concentration, and then enters the coal slime filter press to output the filter-pressed coal slime product.

10. The method for four-stage concentration and recovery of coal sludge water according to claim 9, characterized in that: The overflow of the concentrating cyclone, high-frequency screen and medium coal centrifuge enters the medium gangue magnetic tail barrel, and then is output from the medium gangue magnetic tail barrel to the deep cone concentrator.

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