Phosphorus slag field leachate concentrated water evaporative crystallization desalting system

Abstract

The invention discloses a phosphorus slag field percolate concentrated water evaporative crystallization desalting system which comprises a filtering mechanism, an evaporation mechanism is installed at the lower end of the filtering mechanism, a crystallizer is installed at the lower end of the evaporation mechanism, the filtering mechanism comprises a filtering box and a filtering plate, a liquid inlet pipe is installed at the upper end of the filtering box, and a conveying pipe is installed at the lower end of the filtering box. A plurality of filtering plates are arranged in the filtering box, the diameters of filtering holes of the filtering plates are different, the left ends of the filtering plates penetrate through the filtering box, sealing plates are installed at the right ends of the filtering plates, a matching plate is installed at the left end of the filtering box, and clamping mechanisms are symmetrically installed at the left end of the matching plate. The filtering plate with the corresponding filtering hole diameter can be selected according to the filtering requirement, the percolate concentrated water is stirred through the stirring plate, and the heating evaporation efficiency of the percolate concentrated water is improved; meanwhile, heat exchange is conducted in the annular cavity through the spiral heat exchange pipe, the temperature of the outer surface of the evaporation box is increased, the heat preservation effect of the evaporation box is improved, and heat loss of the evaporation box is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of concentrated water treatment of phosphate slag field leachate, and in particular to a concentrated water evaporation crystallization desalination system for phosphate slag field leachate. Background Art

[0002] Phosphate slag field leachate concentrate refers to a type of wastewater containing high concentrations of soluble solids and suspended solids formed during the stacking and landfilling of the phosphate slag field due to rainwater scouring, groundwater infiltration, and the dissolution of soluble substances in the phosphate slag. After being concentrated, this wastewater forms leachate concentrate. The evaporation crystallization desalination system for the phosphate slag field leachate concentrate refers to the use of evaporation crystallization technology to treat the leachate concentrate generated during the stacking and landfilling of the phosphate slag field, remove the water through the evaporation process, and crystallize the salt dissolved in the water, thereby achieving the purpose of desalination. In the prior art, during the evaporation crystallization of the leachate concentrate, it is necessary to first select the corresponding filter plate according to the actual filtering requirements, and install the corresponding filter plate in the filtration mechanism in the leachate concentrate evaporation crystallization desalination system. During the installation process, it is necessary to remove the previously installed filter plate before installing the required filter plate, which is time-consuming and labor-intensive. At the same time, the steam evaporated from the leachate concentrate cannot be effectively utilized, resulting in waste. Therefore, those skilled in the art provide a phosphate slag field leachate concentrated water evaporation crystallization desalination system to solve the problems raised in the above background technology. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a phosphate slag field leachate concentrated water evaporation crystallization desalination system, comprising a filtering mechanism, an evaporation mechanism is installed at the lower end of the filtering mechanism, a crystallizer is installed at the lower end of the evaporation mechanism, the filtering mechanism comprises a filter box and a filter plate, a liquid inlet pipe is installed at the upper end of the filter box, a delivery pipe is installed at the lower end of the filter box, and the delivery pipe is connected to the evaporation mechanism, a valve is installed on the outer surface of the delivery pipe, a plurality of filter plates are arranged inside the filter box, and the filter holes of the plurality of filter plates have different diameters, the left end of the filter plate passes through the filter box, a sealing plate is installed at the right end of the filter plate, a matching plate is installed at the left end of the filter box, a clamping mechanism is symmetrically installed at the left end of the matching plate, and the matching plate is fixedly connected to the filter box through the clamping mechanism.

[0004] Preferably, a hidden groove is provided on the right inner wall of the filter box at a position corresponding to the sealing plate, and a slide groove is provided symmetrically frontward and rearward on the inner wall of the filter box, and a fixing rod is installed inside the slide groove.

[0005] Preferably, the outer surface of the fixing rod is slidably connected to the sliding block, and the sliding block is fixedly connected to the sealing plate, and a second spring is sleeved on the outer surface of the fixing rod, and the second spring is located on the right side of the sliding block.

[0006] Preferably: the clamping mechanism comprises a movable groove, a clamping block and a fixed block, the movable groove is opened at the left end of the matching plate, the movable groove is slidably connected to the buckle block, the inner wall of the movable groove is symmetrically installed with a limit block, and the limit block passes through the buckle block.

[0007] Preferably: a spring is installed at one end of the buckle and pull block, a clamping block is installed at the other end of the buckle and pull block, the fixed block is fixed at the left end of the filter box, a clamping hole is opened inside the fixed block, and the clamping hole corresponds to the position of the clamping block.

[0008] Preferably: the evaporation mechanism includes an evaporation box and a hollow shaft, a plurality of heating tubes are installed at the bottom of the evaporation box, the hollow shaft is rotatably connected inside the evaporation box, a rotary joint is installed at the upper end of the hollow shaft, gear one is installed on the outer surface of the hollow shaft, gear one is meshed with gear two, and a motor is installed at the upper end of gear two.

[0009] Preferably: a hollow scraper rod is symmetrically installed on the side of the hollow shaft, and the hollow scraper rod contacts the inner wall of the evaporator box, the hollow scraper rod is connected to the hollow shaft, a plurality of air outlet holes are opened at the inner end of the hollow scraper rod, the upper end of the hollow scraper rod is rotatably connected to two rotating shafts, a plurality of stirring plates are installed on the outer surface of the rotating shaft, gear three is installed on the upper end of the rotating shaft, a plurality of annular racks are arranged inside the evaporator box, and the annular racks are meshed with gear three, and the upper end of the annular racks is fixedly connected to the top of the evaporator box through a connecting rod.

[0010] Preferably: an annular cavity is arranged inside the evaporator box, a spiral heat exchange tube is arranged inside the annular cavity, an inlet tube is installed at one end of the spiral heat exchange tube, and the inlet tube is connected to the upper end of the evaporator box, and a return tube is installed at the other end of the spiral heat exchange tube, and the return tube is connected to the rotary joint.

[0011] Preferably: a fixed pipe is installed at the lower end of the evaporator box, and the fixed pipe is connected to the crystallizer, a second valve is installed on the outer surface of the fixed pipe, and a pressure relief valve is installed at the upper end of the evaporator box.

[0012] Technical effects and advantages of the present invention: The present invention can select a filter plate with a corresponding filter hole diameter according to filtering requirements, push the corresponding filter plate to move into the filter box, insert the card block into the card hole, and quickly fix the position of the filter plate, which is convenient, fast, time-saving and labor-saving; the leachate concentrated water is heated by the heating tube, and at the same time, the leachate concentrated water is stirred by the stirring plate to improve the heating evaporation efficiency of the leachate concentrated water; at the same time, hot steam enters the spiral heat exchange tube through the inlet tube, and the heat exchange is performed on the inside of the annular cavity through the spiral heat exchange tube, so that the temperature of the outer surface of the evaporation box is increased, the thermal insulation effect of the evaporation box is improved, and the heat loss of the evaporation box is reduced, and then, the gas enters the hollow shaft and the hollow scraper rod through the reflux pipe, and is sprayed to the leachate concentrated water through the air outlet, so that bubbles are generated inside the leachate concentrated water, the evaporation efficiency of the leachate concentrated water is improved, and the evaporation efficiency is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of this application; Figure 2 It is a structural schematic diagram of the filtering mechanism of the present application; Figure 3 It is a structural schematic diagram of the filter box of this application; Figure 4 It is a structural schematic diagram of the clamping mechanism of the present application; Figure 5 It is a structural schematic diagram of the evaporation mechanism of the present application; Figure 6 It is a structural schematic diagram of the hollow scraper rod of the present application; In the figure: 1. Filter mechanism; 2. Filter box; 3. Liquid inlet pipe; 4. Delivery pipe; 5. Filter plate; 6. Sealing plate; 7. Matching plate; 8. Snap-fit ​​mechanism; 9. Moving groove; 10. Buckle and pull block; 11. Limit block; 12. Spring 1; 13. Clamp block; 14. Fixed block; 15. Clamp hole; 16. Hidden slot; 17. Slide slot; 18. Fixed rod; 19. Slider; 20. Spring 2; 21. Evaporation mechanism; 22. Evaporation box; 23. Heating tube; 24. Hollow shaft; 25. Gear 1; 26. Gear 2; 27. Motor; 28. Rotary joint; 29. ​​Hollow scraper rod; 30. Air outlet; 31. Rotating shaft; 32. Stirring plate; 33. Gear three; 34. Annular rack; 35. Annular cavity; 36. Spiral heat exchange tube; 37. Inlet tube; 38. Reflux tube; 39. Fixed tube; 40. Crystallizer. DETAILED DESCRIPTION

[0014] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0015] See also Figures 1 to 6In this embodiment, a system for evaporating, crystallizing and desalting concentrated water from leachate from a phosphate slag field is provided, comprising a filter mechanism 1, an evaporation mechanism 21 is installed at the lower end of the filter mechanism 1, a crystallizer 40 is installed at the lower end of the evaporation mechanism 21, the filter mechanism 1 comprises a filter box 2 and a filter plate 5, a liquid inlet pipe 3 is installed at the upper end of the filter box 2, a delivery pipe 4 is installed at the lower end of the filter box 2, and the delivery pipe 4 is connected to the evaporation mechanism 21, a valve 1 is installed on the outer surface of the delivery pipe 4, a plurality of filter plates 5 are arranged inside the filter box 2, and the filter holes of the plurality of filter plates 5 have different diameters, the left end of the filter plate 5 passes through the filter box 2, a sealing plate 6 is installed at the right end of the filter plate 5, a matching plate 7 is installed at the left end of the filter box 2, a clamping mechanism 8 is symmetrically installed at the left end of the matching plate 7, and the matching plate 7 is connected to the filter box 2 through the clamping mechanism 8. Fixed connection, the clamping mechanism 8 includes a movable groove 9, a clamping block 13 and a fixed block 14. The movable groove 9 is opened at the left end of the matching plate 7. The movable groove 9 is slidably connected to the buckle pull block 10. The inner wall of the movable groove 9 is symmetrically installed with a limit block 11, and the limit block 11 passes through the buckle pull block 10. A spring 12 is installed at one end of the buckle pull block 10, and a clamping block 13 is installed at the other end of the buckle pull block 10. The fixed block 14 is fixed to the left end of the filter box 2. A clamping hole 15 is opened inside the fixed block 14, and the clamping hole 15 corresponds to the position of the clamping block 13. A hidden groove 16 is opened on the right wall of the filter box 2 corresponding to the position of the sealing plate 6. A slide groove 17 is symmetrically opened on the inner wall of the filter box 2. A fixing rod 18 is installed inside the slide groove 17. The outer surface of the fixing rod 18 is slidably connected to the slider 19, and the slider 19 is fixedly connected to the sealing Plate 6, a spring 20 is sleeved on the outer surface of the fixing rod 18, and the spring 20 is located on the right side of the slider 19, the evaporation mechanism 21 includes an evaporation box 22 and a hollow shaft 24, a plurality of heating tubes 23 are installed at the bottom of the evaporation box 22, the evaporation box 22 is rotatably connected to the hollow shaft 24, a rotary joint 28 is installed on the upper end of the hollow shaft 24, a gear 25 is installed on the outer surface of the hollow shaft 24, the gear 25 is meshed with the gear 26, a motor 27 is installed on the upper end of the gear 26, a hollow scraper rod 29 is symmetrically installed on the side of the hollow shaft 24, and the hollow scraper rod 29 contacts the inner wall of the evaporation box 22, the hollow scraper rod 29 is connected to the hollow shaft 24, a plurality of air outlet holes 30 are opened at the inner end of the hollow scraper rod 29, the upper end of the hollow scraper rod 29 is rotatably connected to two rotating shafts 31, and the appearance of the rotating shaft 31 A plurality of stirring plates 32 are installed on the surface, a gear three 33 is installed on the upper end of the rotating shaft 31, a plurality of annular racks 34 are arranged inside the evaporator box 22, and the annular racks 34 are meshed with the gear three 33, the upper end of the annular racks 34 is fixedly connected to the top of the evaporator box 22 through a connecting rod, an annular cavity 35 is arranged inside the evaporator box 22, a spiral heat exchange tube 36 is arranged inside the annular cavity 35, an inlet tube 37 is installed at one end of the spiral heat exchange tube 36, and the inlet tube 37 is connected to the upper end of the evaporator box 22, a reflux tube 38 is installed at the other end of the spiral heat exchange tube 36, and the reflux tube 38 is connected to the rotary joint 28, a fixed tube 39 is installed at the lower end of the evaporator box 22, and the fixed tube 39 is connected to the crystallizer 40, a valve two is installed on the outer surface of the fixed tube 39, and a pressure relief valve is installed at the upper end of the evaporator box 22.

[0016] The working principle of the present invention is as follows: a filter plate 5 of a corresponding filter hole diameter is selected according to filtering requirements, the filter plate 5 is pushed to move into the filter box 2 by the matching plate 7, the filter plate 5 drives the sealing plate 6 to move, the sealing plate 6 drives the slider 19 to move the compressed spring 20, when the sealing plate 6 moves into the hidden groove 16, the matching plate 7 moves to press against the filter box 2, then the buckle pull block 10 is pushed to move by the spring 12, the buckle pull block 10 drives the card block 13 to be inserted into the card hole 15, and the position of the filter plate 5 is fixed, when other filter plates 5 are not in use, the sealing plate 6 is pushed against the inner wall of the filter box 2 by the spring 20 to prevent liquid from flowing out; The concentrated leachate enters the filter box 2 through the liquid inlet pipe 3, and the concentrated leachate is pre-treated by the filter plate 5 to filter out the particulate impurities inside the concentrated leachate. The filtered concentrated leachate enters the evaporation mechanism 21 through the delivery pipe 4. The leachate concentrate is heated by the heating tube 23 to evaporate the water in the leachate concentrate, thereby concentrating the leachate concentrate. During the heating of the leachate concentrate, the motor 27 drives the hollow shaft 24 to rotate through the meshing of the gear 2 26 and the gear 1 25, and the hollow shaft 24 drives the hollow scraper 29 to rotate. The inner wall of the evaporation box 22 is scraped by the hollow scraper 29 to prevent the concentrated leachate concentrate from adhering to the inner wall of the evaporation box 22. At the same time, the hollow scraper 29 drives the rotating shaft 31 and the stirring plate 32 to rotate horizontally, and the leachate concentrate is stirred by the stirring plate 32. At the same time, the gear 33 rolls on the annular rack 34, so that the rotating shaft 31 rotates and drives the stirring plate 32 to rotate to stir the leachate concentrate, thereby improving the heating and evaporation efficiency of the leachate concentrate. The hot steam heated and evaporated by the leachate concentrate enters the spiral heat exchange tube 36 through the inlet pipe 37, and heat exchange is performed on the inside of the annular cavity 35 through the spiral heat exchange tube 36, so that the temperature of the outer surface of the evaporator box 22 increases, the insulation effect of the evaporator box 22 is improved, and the heat loss of the evaporator box 22 is reduced. The gas after the heat exchange enters the hollow shaft 24 and the hollow scraper rod 29 through the reflux pipe 38, and then is sprayed to the leachate concentrate through the air outlet 30, so that bubbles are generated inside the leachate concentrate, and the evaporation efficiency of the leachate concentrate is improved. The pressure relief valve is used to prevent the internal pressure of the evaporator box 22 from being too high, and the evaporated concentrate enters the crystallizer 40 to form crystals.

[0017] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. A system for desalination of concentrated water from leachate from a phosphate slag field by evaporation and crystallization, comprising a filtering mechanism (1), characterized in that: The evaporation mechanism (21) is installed at the lower end of the filter mechanism (1), and the crystallizer (40) is installed at the lower end of the evaporation mechanism (21). The filter mechanism (1) comprises a filter box (2) and a filter plate (5). The upper end of the filter box (2) is installed with a liquid inlet pipe (3), and the lower end of the filter box (2) is installed with a delivery pipe (4), and the delivery pipe (4) is connected to the evaporation mechanism (21). A valve 1 is installed on the outer surface of the delivery pipe (4). A plurality of filter plates (5) are arranged inside the filter box (2), and the filter holes of the plurality of filter plates (5) have different diameters. The left end of the filter plate (5) passes through the filter box (2), and a sealing plate (6) is installed at the right end of the filter plate (5). A matching plate (7) is installed at the left end of the filter box (2), and a clamping mechanism (8) is symmetrically installed at the left end of the matching plate (7), and the matching plate (7) is fixedly connected to the filter box (2) through the clamping mechanism (8).

2. A phosphate slag field leachate concentrated water evaporation crystallization desalination system according to claim 1, characterized in that: A hidden groove (16) is provided on the right inner wall of the filter box (2) at a position corresponding to the sealing plate (6), and a slide groove (17) is symmetrically provided on the inner wall of the filter box (2) at the front and rear sides, and a fixing rod (18) is installed inside the slide groove (17).

3. A phosphate slag field leachate concentrated water evaporation crystallization desalination system according to claim 2, characterized in that: The outer surface of the fixed rod (18) is slidably connected to the slider (19), and the slider (19) is fixedly connected to the sealing plate (6). The outer surface of the fixed rod (18) is sleeved with a second spring (20), and the second spring (20) is located on the right side of the slider (19).

4. The phosphate slag field leachate concentrated water evaporation crystallization desalination system according to claim 1, characterized in that: The clamping mechanism (8) comprises a movable groove (9), a clamping block (13) and a fixed block (14); the movable groove (9) is arranged at the left end of the matching plate (7); the movable groove (9) is slidably connected to the buckle block (10); a limit block (11) is symmetrically installed on the inner wall of the movable groove (9), and the limit block (11) passes through the buckle block (10).

5. A phosphate slag field leachate concentrated water evaporation crystallization desalination system according to claim 4, characterized in that: A spring (12) is installed at one end of the buckle block (10), and a clamping block (13) is installed at the other end of the buckle block (10). The fixed block (14) is fixed to the left end of the filter box (2). A clamping hole (15) is provided inside the fixed block (14), and the clamping hole (15) corresponds to the position of the clamping block (13).

6. The phosphate slag field leachate concentrated water evaporation crystallization desalination system according to claim 1, characterized in that: The evaporation mechanism (21) comprises an evaporation box (22) and a hollow shaft (24); a plurality of heating tubes (23) are installed at the bottom of the evaporation box (22); the hollow shaft (24) is rotatably connected inside the evaporation box (22); a rotary joint (28) is installed at the upper end of the hollow shaft (24); a gear 1 (25) is installed on the outer surface of the hollow shaft (24); the gear 1 (25) is meshed with a gear 2 (26); and a motor (27) is installed at the upper end of the gear 2 (26).

7. A phosphate slag field leachate concentrated water evaporation crystallization desalination system according to claim 6, characterized in that: A hollow scraper rod (29) is symmetrically mounted on the side of the hollow shaft (24), and the hollow scraper rod (29) contacts the inner wall of the evaporation box (22). The hollow scraper rod (29) is connected to the hollow shaft (24). A plurality of air outlet holes (30) are provided at an inner end of the hollow scraper rod (29). The upper end of the hollow scraper rod (29) is rotatably connected to two rotating shafts (31). A plurality of stirring plates (32) are mounted on the outer surface of the rotating shaft (31). A gear three (33) is mounted on the upper end of the rotating shaft (31). A plurality of annular racks (34) are arranged inside the evaporation box (22), and the annular racks (34) are meshed with the gear three (33). The upper end of the annular racks (34) is fixedly connected to the top of the evaporation box (22) via a connecting rod.

8. The phosphate slag field leachate concentrated water evaporation crystallization desalination system according to claim 6, characterized in that: An annular cavity (35) is provided inside the evaporator box (22), a spiral heat exchange tube (36) is provided inside the annular cavity (35), an inlet tube (37) is installed at one end of the spiral heat exchange tube (36), and the inlet tube (37) is connected to the upper end of the evaporator box (22), and a return tube (38) is installed at the other end of the spiral heat exchange tube (36), and the return tube (38) is connected to the rotary joint (28).

9. The phosphate slag field leachate concentrated water evaporation crystallization desalination system according to claim 6, characterized in that: A fixed pipe (39) is installed at the lower end of the evaporation box (22), and the fixed pipe (39) is connected to the crystallizer (40). A second valve is installed on the outer surface of the fixed pipe (39), and a pressure relief valve is installed at the upper end of the evaporation box (22).

Images