Crystal mush thickening system
By designing a multi-stage screening and stirring crystal slurry thickening system in high-salt wastewater treatment, the problems of large centrifuge load and small crystal particles are solved, and higher salt yield and equipment stability are achieved.
Patent Information
- Application Number
- CN202420287549.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-07
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2034-02-07
AI Technical Summary
During the evaporation process of the high-salt wastewater generated in the production of ternary lithium battery materials, the centrifuge cannot operate smoothly, resulting in equipment damage and increased operating costs, and the crystallization particles are small and the particle size distribution is not concentrated, resulting in difficulty in salt production.
Design a crystal slurry thickening system, including a connected eliminator, cyclone and thickener, to promote crystal growth through multi-stage screening and agitator, increase solid-liquid ratio, reduce centrifuge load, avoid material runoff and blockage .
The solid-liquid ratio of crystal slurry in the centrifuge is increased, the centrifuge load is reduced, the smooth operation is ensured, material discharge and blockage are avoided, and the salt yield is improved.
Smart Images
Figure CN222218623U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of wastewater treatment, in particular to a high-salt wastewater evaporation slurry thickening system. Background Art
[0002] In the process of industrial production, especially in the production of ternary lithium battery materials, high-salt wastewater will be generated. At present, high-salt wastewater is basically separated by evaporation, concentration and crystallization to separate the high-salt solids. The concentrated liquid in the evaporation process will be separated into solids and liquids by centrifuges. The centrifuge has certain requirements for the solid-liquid ratio of the material. If the material does not meet the solid-liquid ratio requirements of the centrifuge material, the centrifuge will vibrate greatly and the centrifuge will not be able to run smoothly. In the long run, it will shorten the life of the equipment and increase the operating cost. In addition, when the salt evaporates and crystallizes, the crystals are greatly disturbed and the residence time is short, resulting in small crystal particles and non-concentrated particle size distribution. When discharging by centrifugation, small particle crystals are easy to run and block the sieve holes of the centrifuge, resulting in centrifugal loosening and difficulty in discharging salt. Utility Model Content
[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a slurry thickening system which can reduce the load of a centrifuge and improve the salt output rate.
[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:
[0005] A slurry thickening system comprises an elutriator, a cyclone 1, a thickener and a cyclone 2 which are connected in sequence, the elutriator being connected to the bottom of an evaporator, the cyclone 1 being provided with a reflux pipe 1 connected to the evaporator, the thickener being provided with an overflow pipe connected to the evaporator, the cyclone 2 being provided with a reflux pipe 2 connected to the evaporator, and the bottom of the cyclone 2 being connected to a centrifuge.
[0006] As a further improvement of the above technical solution:
[0007] The elutriator is also connected to the cyclone 1 through a crystal pump, and a feed valve is provided between the crystal pump and the cyclone 1.
[0008] A steam purge pipe is further provided between the feed valve and the first cyclone and between the thickener and the second cyclone, and a purge valve is provided on the steam purge pipe.
[0009] The reflux pipe 1 is provided with a reflux valve 1, the overflow pipe is provided with an overflow valve, and the reflux pipe 2 is provided with a reflux valve 2.
[0010] A sight glass is arranged between the cyclone 1 and the thickener.
[0011] The thickener comprises a shell, a fixed bracket is arranged outside the shell, a rotating shaft penetrating into the shell is movably connected to the shell, a driver for driving the rotating shaft to rotate is also arranged on the shell, and a stirrer is connected to the lower part of the rotating shaft.
[0012] The agitator comprises a scraper and a support plate. The bottom of the scraper is fixedly connected to the rotating shaft. The support plate is fixedly connected to the rotating shaft and has two ends connected to the scraper to form support for the scraper.
[0013] A manhole is also provided on the shell.
[0014] Compared with the prior art, the advantages of the utility model are:
[0015] When in use, high-salt wastewater is first dispersed and evaporated in the evaporator, and crystals are continuously precipitated from the concentrated salty water. The crystals descend during the precipitation process and enter the bottom of the evaporator, where they are screened by the elutriator. Small crystals continue to circulate and grow in the evaporator, while the slurry containing large crystals enters the cyclone 1 and is centrifugally rotated under the action of the tangential force. Since the cyclone 1 is conical, crystals of different sizes have different sedimentation rates in the slurry. Among them, larger crystals quickly settle to the bottom of the cyclone 1 and enter the thickener to promote growth. The slurry in the upper layer of the cyclone 1 enters the evaporator through the reflux pipe 1 for further concentration, and the suspended slurry in the upper layer of the thickener enters the evaporator through the overflow pipe for further concentration. The slurry after gravity sedimentation enters the cyclone 2 for centrifugal rotation, and large-particle crystals are further screened out and enter the centrifuge for solid-liquid separation. The utility model arranges an elutriator at the bottom of the evaporator to discharge large-particle crystals in time, which is conducive to the growth of crystals. The large-particle crystals are screened in multiple stages by the first cyclone, the thickener and the second cyclone, which greatly improves the solid-liquid ratio of the slurry entering the centrifuge, makes it meet the solid-liquid ratio requirement of the centrifuge, is easier to separate in the centrifuge, reduces the load of the centrifuge, ensures the stable operation of the centrifuge, and the screened large-particle crystals avoid running away and clogging the sieve holes of the centrifuge, thereby improving the salt output rate. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a structural schematic diagram of the utility model.
[0017] The symbols in the figure represent:
[0018] 1. Elutriator; 2. Cyclone 1; 3. Thickener; 31. Shell; 311. Manhole; 32. Fixed bracket; 33. Rotating shaft; 34. Driver; 35. Agitator; 351. Scraper; 352. Support plate; 4. Cyclone 2; 5. Reflux pipe 1; 6. Overflow pipe; 7. Reflux pipe 2; 8. Crystal pump; 9. Feed valve; 10. Steam purge pipe; 11. Purge valve; 12. Reflux valve 1; 13. Overflow valve; 14. Reflux valve 2; 15. Sight glass; 16. Evaporator; 17. Centrifuge. DETAILED DESCRIPTION
[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0020] like Figure 1 As shown, the slurry thickening system of this embodiment includes an elutriator 1, a cyclone 2, a thickener 3 and a cyclone 4 which are connected in sequence, the elutriator 1 is connected to the bottom of the evaporator 16, the cyclone 2 is provided with a reflux pipe 5 connected to the evaporator 16, the thickener 3 is provided with an overflow pipe 6 connected to the evaporator 16, the cyclone 4 is provided with a reflux pipe 7 connected to the evaporator 16, and the bottom of the cyclone 4 is connected to the centrifuge 17. During use, high-salt wastewater is first dispersed and evaporated in the evaporator 16, and crystals are continuously precipitated from the concentrated salty water. The crystals descend during the precipitation process and enter the bottom of the evaporator 16, and are screened by the elutriator 1. Small crystals continue to circulate and grow in the evaporator 16, while the slurry containing large crystals enters the cyclone 2 and is centrifugally rotated under the action of the tangential force. Since the cyclone 2 is conical, crystals of different sizes have different sedimentation rates in the slurry. Among them, larger crystals quickly settle to the bottom of the cyclone 2 and enter the thickener 3 to promote growth. The slurry in the upper layer of the cyclone 2 enters the evaporator 16 through the reflux pipe 5 for further concentration, and the suspended slurry in the upper layer of the thickener 3 enters the evaporator 16 through the overflow pipe 6 for further concentration. The slurry after gravity sedimentation enters the cyclone 2 4 for centrifugal rotation, and large particle crystals are further screened out and enter the centrifuge 17 for solid-liquid separation. The utility model arranges an elutriator 1 at the bottom of the evaporator 16 to discharge large-particle crystals in time, which is conducive to the growth of crystals. The large-particle crystals are screened in multiple stages by the cyclone 1 2, the thickener 3 and the cyclone 2 4, which greatly improves the solid-liquid ratio of the slurry entering the centrifuge 17, so that it meets the solid-liquid ratio requirement of the centrifuge 17, is easier to separate in the centrifuge 17, reduces the load of the centrifuge 17, ensures the smooth operation of the centrifuge 17, and the screened large-particle crystals avoid running away and clogging the sieve holes of the centrifuge 17, thereby improving the salt output rate.
[0021] In this embodiment, the elutriator 1 is also connected to the cyclone 2 through a crystal pump 8, and a feed valve 9 is provided between the crystal pump 8 and the cyclone 2. In this structure, the design can ensure that the crystals that cannot grow into large particles in the evaporator 16 can also enter the cyclone 2 for subsequent recovery.
[0022] In this embodiment, a steam purge pipe 10 is further provided between the feed valve 9 and the cyclone 1 2 and between the thickener 3 and the cyclone 2 4, and a purge valve 11 is provided on the steam purge pipe 10. In this structure, the lower parts of the cyclone 1 2, the thickener 3 and the cyclone 2 4 are all conical structures, and the narrow bottom is easy to be silted and blocked. The steam purge pipe 10 can effectively prevent the situation of grain deposition and blockage, and the purge valve 11 is provided to facilitate operation and control.
[0023] In this embodiment, a reflux valve 12 is provided on the reflux pipe 1 5 , an overflow valve 13 is provided on the overflow pipe 6 , and a reflux valve 2 14 is provided on the reflux pipe 2 7 .
[0024] In this embodiment, a sight glass 15 is provided between the cyclone 2 and the thickener 3. In this structure, the sight glass 15 is provided to facilitate observation of the flow of the slurry discharged from the cyclone 2 and timely detection of problems.
[0025] In this embodiment, the thickener 3 includes a shell 31, a fixed bracket 32 is arranged outside the shell 31, a rotating shaft 33 is movably connected to the shell 31 and penetrates into the shell 31, a driver 34 for driving the rotating shaft 33 to rotate is also arranged on the shell 31, and a stirrer 35 is connected to the lower part of the rotating shaft 33. In this structure, the solid-liquid ratio of the slurry entering the thickener 3 is relatively high, and agglomeration and blockage are easily generated. By setting the stirrer 35 to stir slowly and continuously, the slurry in the thickener 3 is kept in a flowing state, the supersaturation of the slurry is eliminated, and the crystal growth is promoted.
[0026] In this embodiment, the stirrer 35 includes a scraper 351 and a support plate 352. The bottom of the scraper 351 is fixedly connected to the rotating shaft 33. The support plate 352 is fixedly connected to the rotating shaft 33 and the two ends of the support plate 352 are connected to the scraper 351 to support it. In this structure, the scraper 351 is provided to scrape off the crystals deposited on the side wall of the cone at the bottom of the thickener 3 while playing a stirring role, thereby reducing the loss. The scraper 351 is supported by the support plate 352, thereby ensuring the stability of its structure and the reliability of its connection.
[0027] In this embodiment, a manhole 311 is also provided on the housing 31. In this structure, the manhole 311 is provided for easy maintenance.
[0028] Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the art can use the above disclosed technical content to make many possible changes and modifications to the technical solution of the present invention without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.
Claims
1. A slurry thickening system, characterized in that: The invention comprises an elutriator (1), a cyclone 1 (2), a thickener (3) and a cyclone 2 (4) which are connected in sequence. The elutriator (1) is connected to the bottom of an evaporator (16). The cyclone 1 (2) is provided with a return pipe 1 (5) connected to the evaporator (16). The thickener (3) is provided with an overflow pipe (6) connected to the evaporator (16). The cyclone 2 (4) is provided with a return pipe 2 (7) connected to the evaporator (16). The bottom of the cyclone 2 (4) is connected to a centrifuge (17).
2. The slurry thickening system according to claim 1, characterized in that: The elutriator (1) is also connected to the cyclone one (2) via a crystal pump (8), and a feed valve (9) is provided between the crystal pump (8) and the cyclone one (2).
3. The slurry thickening system according to claim 2, characterized in that: A steam purge pipe (10) is also provided between the feed valve (9) and the cyclone 1 (2) and between the thickener (3) and the cyclone 2 (4), and a purge valve (11) is provided on the steam purge pipe (10).
4. The slurry thickening system according to claim 3, characterized in that: The reflux pipe 1 (5) is provided with a reflux valve 1 (12), the overflow pipe (6) is provided with an overflow valve (13), and the reflux pipe 2 (7) is provided with a reflux valve 2 (14).
5. The slurry thickening system according to claim 4, characterized in that: A sight glass (15) is provided between the cyclone 1 (2) and the thickener (3).
6. The slurry thickening system according to any one of claims 1 to 5, characterized in that: The thickener (3) comprises a shell (31), a fixed bracket (32) is arranged outside the shell (31), a rotating shaft (33) is movably connected to the shell (31) and penetrates into the shell (31), and a driver (34) for driving the rotating shaft (33) to rotate is also arranged on the shell (31), and a stirrer (35) is connected to the lower part of the rotating shaft (33).
7. The slurry thickening system according to claim 6, characterized in that: The stirrer (35) comprises a scraper (351) and a support plate (352); the bottom of the scraper (351) is fixedly connected to the rotating shaft (33); the support plate (352) is fixedly connected to the rotating shaft (33) and its two ends are connected to the scraper (351) to form support for it.
8. The slurry thickening system according to claim 7, characterized in that: The housing (31) is also provided with a manhole (311).