Four-stage concentration and recovery treatment system for slime water
By introducing a deep cone thickener and a thickening hydrocyclone into the secondary thickening process of a heavy media coal preparation plant, a four-stage thickening and recovery system is formed, which solves the problem of insufficient thickener processing capacity, achieves efficient material recovery and stable production, and improves the output and economic benefits of middlings coal.
Patent Information
- Application Number
- CN202423056430.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-11
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2034-12-11
AI Technical Summary
In the existing secondary thickening and recovery process of heavy media coal preparation plants, the primary thickener has insufficient processing capacity, which leads to frequent blockages of the rake and underflow pipe, resulting in low middlings production and high coal slime production, affecting production efficiency and environmental risks.
By adding a deep cone thickener and a hydrocyclone to the traditional two-stage thickening process, along with a high-frequency screen, a four-stage thickening and recovery system is formed. The deep cone thickener processes large-flow coarse-particle materials, the hydrocyclone increases the material concentration, and the high-frequency screen ensures the feed concentration and reduces the pressure in the underflow pipeline, thus achieving the gradual recovery of materials.
It effectively avoids accidents during thickener operation, increases middlings coal production, reduces coal slime production, improves production efficiency and economic benefits, reduces environmental risks, and is suitable for the transformation and upgrading of traditional thickening processes.
Smart Images
Figure CN223555670U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to coal slime water recovery treatment technical field, and specifically speaking, relate to a coal slime water four stage concentration recovery treatment system. BACKGROUND
[0002] As Figure 1 The existing technology in recent years new heavy medium coal preparation plant coal slime water treatment system generally adopts two stage settlement, two stage (section) concentration recovery treatment process. The coal slime water (flotation tailings) is concentrated by the first stage thickener (24 meters thickener) natural settlement, and the underflow is recovered as the medium coal product after dehydration by the high frequency screen and the medium coal horizontal centrifuge. The overflow enters the second stage thickener (38 meters thickener), and the underflow of the second stage thickener (38 meters thickener) becomes the filter press coal slime product after pressure filtration dehydration, and the overflow is recycled as the production water. Since the two stage concentration recovery treatment process, the first stage thickener (24 meters thickener) is insufficient in treatment capacity. The first stage thickener (24 meters thickener) often appears 'pressing rake' and underflow pipeline blockage accident. After the accident, only shutdown treatment can be taken, and the accident treatment is difficult and takes a long time to dredge, and the influence time of each time dredging the underflow pipeline is more than 2 hours, which seriously affects the normal production time.
[0003] In addition, since the material entering the first stage thickener (24 meters thickener) is much, the first stage thickener (24 meters thickener) is insufficient in rough cutting and treatment capacity, so that the first stage thickener (24 meters thickener) is in high position operation for a long time. The part of material that should be recovered with the first stage underflow into the medium coal 'runs' into the second stage thickener (38 meters thickener), thereby causing the yield of filter press coal slime to increase. Not only the economic benefit is affected, but also the risk and pressure of subsequent environmental protection management are increased.
[0004] In order to solve the above problems, people have been seeking an ideal technical solution. INVENTION CONTENTS
[0005] The utility model aims at the deficiency of prior art, and provides a coal slime water four stage concentration recovery treatment system for solving a series of problems such as large pressure of first stage thickener, frequent 'pressing rake' problem, easy blockage of underflow pipeline, less medium coal yield and more coal slime yield caused by traditional two stage concentration.
[0006] In order to realize the above object, the technical scheme adopted by the utility model is as follows: a coal slime water four stage concentration recovery treatment system, which comprises a deep cone thickener, a concentration cyclone, a high frequency screen, a first stage thickener, a second stage thickener, a coal slime filter press, a medium coal centrifuge and a medium gangue magnetic tail barrel.
[0007] The inlet of the deep-cone thickener is a flotation inlet, the underflow outlet of the deep-cone thickener is communicated with the inlet of a high-frequency screen, and the overflow outlet of the deep-cone thickener is communicated with the inlet of a primary thickener, and the deep-cone thickener is used for primary precipitation and concentration of coarse particles;
[0008] The underflow outlet of the thickening hydrocyclone is communicated with the inlet of the high-frequency screen, the overflow outlet of the thickening hydrocyclone is communicated with the middings tailing bucket, and the thickening hydrocyclone is used for secondary precipitation and concentration.
[0009] The underflow outlet of the high-frequency screen is communicated with the inlet of the medium-coal centrifugal machine, and the overflow outlet of the medium-coal centrifugal machine is communicated with the middings tailing bucket.
[0010] The underflow outlet of the primary thickener is communicated with a slime re-separation system, the overflow outlet of the primary thickener is communicated with the inlet of a secondary thickener, and the primary thickener is used for tertiary precipitation and concentration.
[0011] The underflow outlet of the secondary thickener is communicated with a circulating water system, and the overflow outlet of the secondary thickener is communicated with the inlet of a slime filter press, and the secondary thickener is used for quaternary precipitation and concentration.
[0012] According to the above, the output end of the middings tailing bucket is communicated with the inlet of the deep-cone thickener.
[0013] According to the above, the overflow outlet of the slime filter press is communicated with the inlet of the secondary thickener.
[0014] According to the above, the primary thickener is a 24-meter thickener.
[0015] According to the above, the secondary thickener is a 38-meter thickener.
[0016] According to the above, the deep-cone thickener is φ15m in size and 64.5° in cone angle.
[0017] According to the above, the deep-cone thickener is provided with a double-layer high-efficiency distributor, and the processing capacity is ≥2400m 3 / h.
[0018] Compared with the prior art, the utility model discloses a substantial feature and progress, specifically speaking, the utility model discloses a set of deep-cone thickener is added before the primary thickener on the basis of traditional two-stage concentration, utilizes the advantage of large processing capacity and high efficiency of the deep-cone thickener, alleviates the pressure of the original primary thickener, makes the coarse particle material entering the primary thickener obviously reduce, and the material level of the primary thickener and the secondary thickener linearly decreases, thereby guaranteeing the stable and normal operation of the primary thickener and the secondary thickener, solving a series of problems, such as poor coarse cutting effect, insufficient processing capacity and overflow easy to run coarse, of the primary thickener in the traditional two-stage concentration process, completely avoiding the occurrence of 'pressing harrow' and underflow pipeline blockage accidents in the operation process of the 24-meter thickener, and effectively improving production efficiency.
[0019] The deep-cone thickener is introduced to pre-treat, and the concentration cyclone is introduced to improve the medium coal quality and output, so that the four-stage concentration is actually completed compared with the traditional two-stage concentration, the process of gradually recovering the coal slurry is more scientific, the effect of collecting all the materials, decreasing the coal slurry in stages and accurately recovering the products is achieved, the medium coal output is effectively improved, the coal slurry output is reduced, and the economic benefit and environmental protection benefit are highlighted.
[0020] Overall, the deep-cone thickener is introduced to pre-treat, the concentration cyclone is introduced to improve the medium coal quality and output, and four-stage concentration is actually completed compared with the traditional two-stage concentration, so that the process of gradually recovering the coal slurry is more scientific, and the effect of collecting all the materials, decreasing the coal slurry in stages and accurately recovering the products is achieved. Overall, the medium coal output is effectively improved, the coal slurry output is reduced, and the economic benefit and environmental protection benefit are highlighted.
[0021] Furthermore, the scheme is particularly suitable for upgrading the traditional concentration process, and only needs to set the deep-cone thickener and the concentration cyclone in front of the traditional one-stage thickener and the high-frequency screen, and replan a part of pipeline routes, so that the difficulty of transformation is low and the scheme is suitable for upgrading the old production line. BRIEF DESCRIPTION OF DRAWINGS
[0022] Figure 1 is a structural principle diagram of a two-stage concentration system in the prior art.
[0023] Figure 2 is a principle diagram of a coal slurry four-stage concentration recovery treatment system in the utility model. DETAILED DESCRIPTION
[0024] The technical scheme of the utility model will be further described in detail through specific embodiments.
[0025] As shown in Figure 2 A coal slurry four-stage concentration recovery treatment system includes a deep-cone thickener, a concentration cyclone, a high-frequency screen, a one-stage thickener, a two-stage thickener, a coal slurry filter press, a medium coal centrifuge and a medium gangue magnetic tail barrel. In this embodiment, the one-stage thickener is a 24-meter thickener, and the two-stage thickener is a 38-meter thickener.
[0026] The inlet of the deep-cone thickener is a flotation inlet, the underflow port of the deep-cone thickener is communicated with the inlet of the high-frequency screen, and the overflow port of the deep-cone thickener is communicated with the inlet of the one-stage thickener. The deep-cone thickener is used for one-stage deposition and concentration of coarse particle materials. In this embodiment, the model specification of the deep-cone thickener is φ15m, the cone angle is 64.5°, the deep-cone thickener adopts a double-layer high-efficiency distributor, and the treatment capacity is ≥2400m 3 / h.
[0027] In this embodiment, the core purpose of the newly added deep cone thickener is to alleviate the processing pressure of the traditional primary thickener. By utilizing its large flow processing characteristics, the coarse material is preliminarily processed, so that the material entering the traditional 24-meter thickener and 38-meter thickener is significantly reduced, thereby avoiding a series of problems faced by the 24-meter thickener in the traditional scheme.
[0028] The underflow port of the concentration cyclone is connected to the inlet of the high-frequency screen, the overflow port of the cyclone thickener is connected to the medium gangue magnetic tail bucket, and the concentration cyclone is used for secondary precipitation and concentration.
[0029] The core purpose of the newly added concentration cyclone is to cooperate with the deep cone thickener. Since the deep cone thickener has large flow and high processing efficiency, the underflow often contains a large amount of water. By utilizing the high-efficiency concentration effect of the concentration cyclone, the material entering the high-frequency screen can maintain a high concentration, ensuring that the high-frequency screen has a "non-diluted" inlet concentration and a "non-water" outlet concentration. At the same time, due to its high efficiency, it can reduce the pressure of the deep cone thickener underflow pipeline, making the deep cone thickener run smoothly.
[0030] The underflow 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 output end of the medium gangue magnetic tail bucket is connected to the inlet of the deep cone thickener.
[0031] The underflow port of the primary thickener is connected to the coal slime reselection system, the overflow port of the primary thickener is connected to the inlet of the secondary thickener, and the primary thickener is used for three times of precipitation and concentration.
[0032] The underflow port of the secondary thickener is connected to the circulating water system, the overflow port of the secondary thickener is connected to the inlet of the coal slime filter press, the secondary thickener is used for four times of precipitation and concentration, and the overflow port of the coal slime filter press is connected to the inlet of the secondary thickener.
[0033] The process of using the above coal slime water four-stage concentration recovery treatment system for coal slime water four-stage concentration recovery treatment is as follows:
[0034] The coal slime water enters the deep cone thickener, which utilizes a processing flow of ≥2400 m 3 / h to perform efficient and large-flow primary precipitation and concentration, reducing the content of coarse particles in the overflow;
[0035] The underflow of the deep cone thickener enters the concentration cyclone for secondary precipitation and concentration, improving the concentration of the coal slime water entering the high-frequency screen;
[0036] The underflow of the concentration cyclone enters the high-frequency screen, and after being processed by the high-frequency screen, it enters the medium coal centrifuge to output medium coal products.
[0037] The overflow after the rough treatment of the deep cone thickener enters a primary thickener, and is subjected to three times of sedimentation and concentration. The overflow of the primary thickener enters a secondary thickener, and is subjected to four times of sedimentation and concentration. Then, the overflow of the secondary thickener enters a coal slime filter press, and outputs filter-pressed coal slime products.
[0038] The overflow of the thickening hydrocyclone, the high-frequency screen and the medium coal centrifuge enters a medium gangue magnetic tail bucket, and is output to the deep cone thickener from the medium gangue magnetic tail bucket.
[0039] A comparative experiment is conducted between the coal slime water four-stage concentration recovery treatment system provided in the embodiment and a coal slime water recovery treatment system in the prior art as shown in Figure 1 The 24-meter thickener underflow particle size composition of the embodiment and the prior art is shown in Table 1 and Table 2. The 24-meter thickener overflow particle size composition of the embodiment and the prior art is shown in Table 3 and Table 4. The medium coal and filter-pressed coal slime yield comparison between the embodiment and the prior art is shown in Table 5.
[0040] Table 1 24-meter thickener underflow particle size composition in the coal slime water four-stage concentration recovery treatment system provided in the embodiment
[0041]
[0042] Table 2 24-meter thickener underflow particle size composition in the coal slime water recovery treatment system in the prior art
[0043]
[0044]
[0045] As can be seen from Table 1 and Table 2, the content of the 0.125 mm particle size level and above in the 24-meter thickener underflow in the embodiment is reduced from 54.8% in the prior art to 13.4%. The reduction of coarse particles in the 24-meter thickener underflow reflects that the coarse cutting effect of the deep cone thickener is significant. 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 “pressing rake” and underflow pipeline blockage accidents.
[0046] Table 3 24-meter thickener overflow particle size composition in the coal slime water four-stage concentration recovery treatment system provided in the embodiment
[0047]
[0048] Table 4 24-meter thickener overflow particle size composition in the coal slime water recovery treatment system in the prior art
[0049]
[0050]
[0051] Comparing Table 3 and Table 4, it can be seen that the content of the size of 0.125 mm or more in the overflow of the 24-meter thickener in the embodiment is reduced from 15% in the prior art to 6.2%, with a reduction of more than 50%. It can be seen that the overflow of the 24-meter thickener in the embodiment is significantly improved.
[0052] Table 5 Comparison of the yield and production rate of the filtered slime and middlings obtained by the embodiment and the prior art
[0053]
[0054] As shown in Table 5, after the slime water recovery process is upgraded, the production rate of the middlings is increased by 1.6%, and the yield of the middlings is increased by 93816 tons. The production rate of the slime is decreased by 2.44%, and the yield of the slime is decreased by 144342 tons. The increase of the yield of the middlings increases the yield of the high value-added products, and the decrease of the yield of the slime relieves the pressure of the subsequent drying and sales of the slime, with outstanding economic and environmental benefits.
[0055] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that: the specific embodiments of the present application can still be modified or some technical features can be replaced by equivalent; without departing from the spirit of the technical scheme of the present application, all should be covered in the technical scheme range of the present application claimed by the present application.
Claims
1. A slime water four-stage concentration recovery treatment system, characterized in that: The deep-cone thickener, the thickening cyclone, the high-frequency screen, the first-stage thickener, the second-stage thickener, the slime filter press, the medium-coal centrifuge and the medium-gangue magnetic tailing bucket are arranged in series. The deep-cone thickener is used for primary precipitation and concentration of coarse granular materials. The thickening cyclone is used for secondary precipitation and concentration. The high-frequency screen is used for medium-coal centrifugation. The first-stage thickener is used for tertiary precipitation and concentration. The second-stage thickener is used for quaternary precipitation and concentration.
2. The coal slurry water four-stage concentration and recovery treatment system according to claim 1, characterized in that: The output end of the medium-gangue magnetic tailing bucket is connected with the inlet of the deep-cone thickener.
3. The coal slurry water four-stage concentration and recovery treatment system according to claim 2, characterized in that: The overflow port of the slime filter press is connected with the inlet of the second-stage thickener.
4. The coal slurry water four-stage concentration and recovery treatment system according to claim 1 or 2 or 3, characterized in that: The first-stage thickener is a 24-meter thickener.
5. The coal slurry water four-stage concentration and recovery treatment system according to claim 1 or 2 or 3, characterized in that: The second-stage thickener is a 38-meter thickener.
6. The coal slurry water four-stage concentration and recovery system of claim 4, wherein: The second-stage thickener is a 38-meter thickener.
7. The coal slurry water four-stage concentration and recovery treatment system according to claim 1 or 2 or 3 or 6, characterized in that: The deep-cone thickener is φ15m in size and 64.5° in cone angle.
8. The coal slurry water four-stage concentration and recovery system of claim 7, wherein: The deep layer distributor of the deep cone thickener adopts double-layer high-efficiency distributor, and the treatment capacity is ≥2400 m 3 / h.