CN216377506U - Recycling device for phosphogypsum backwater - Google Patents
Recycling device for phosphogypsum backwater Download PDFInfo
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- CN216377506U CN216377506U CN202122591635.1U CN202122591635U CN216377506U CN 216377506 U CN216377506 U CN 216377506U CN 202122591635 U CN202122591635 U CN 202122591635U CN 216377506 U CN216377506 U CN 216377506U
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Abstract
The utility model discloses a recycling device of phosphogypsum backwater, and belongs to the technical field of wet-process phosphoric acid. The system comprises a neutralization reaction tank, a settling tank, a filter press, a repulping tank and a slurry and slag collecting tank, wherein a phosphogypsum yard, a water cooling tower, an atmospheric condenser, the neutralization reaction tank and the settling tank are sequentially connected, an overflow port of the settling tank is connected with a feed port of the filter press, a sediment outlet of the settling tank is connected with the slurry and slag collecting tank, a filter residue outlet of the filter press and the slurry and slag collecting tank are both connected with the repulping tank, and the repulping tank is connected with a slurry tank; the liquid outlet of the atmospheric condenser is also connected with the hot water tank of the vacuum disc filter, the liquid outlet of the neutralization reaction tank is also connected with the feed inlet of the ball mill, the middle part of the side wall of the settling tank is provided with a turbid water outlet, the turbid water outlet is connected with the repulping tank, and the filtrate outlet of the filter press is connected with the hot water tank. The temperature, the pH value and the cleanliness of the backwater after the heat exchange of the atmospheric condenser and the backwater after the heat exchange, the neutralization, the sedimentation and the filter pressing are mixed meet the requirements of water for filtering phosphoric acid.
Description
Technical Field
The utility model belongs to the technical field of wet-process phosphoric acid, and particularly relates to a recycling device of phosphogypsum backwater.
Background
Phosphogypsum is an industrial byproduct gypsum generated in the production of high-concentration phosphorus compound fertilizer, and the main component of the phosphogypsum is calcium sulfate dihydrate (CaSO)4·2H2O), 1 ton of phosphoric acid (100% P) is prepared2O5Measured) to produce 4.8-5.0 tons of phosphogypsum, and the pressure of solid waste is very large, so the phosphogypsum needs to be treated in time. At present, phosphogypsum stacking of domestic manufacturers generally adopts two methods of wet discharging stacking and dry discharging and dry stacking.
Wet dumping: the filtering station of the phosphoric acid device adopts wet-method deslagging, phosphogypsum is firstly mixed with water to prepare phosphogypsum slag slurry with 70-80% of water, then the phosphogypsum slag slurry is pumped to a phosphogypsum tailing pond by adopting a one-stage or multi-stage pump according to the distance of conveying, and clear water after natural sedimentation is pumped to the phosphoric acid device by using water for reuse. The method is generally adopted by domestic large-scale wet-process phosphoric acid devices. The method has the advantages of high recovery rate of wastewater and phosphoric acid, environmental protection, energy conservation, convenient operation, low operating cost and the like.
Dry draining and piling: the dry discharging and dry piling process is the ardealite piling mode which is applied to the wet phosphoric acid production at first. The filtering station of the phosphoric acid device adopts dry-method deslagging, the phosphogypsum with the water content of less than 20 percent is conveyed to a phosphogypsum warehouse by a belt conveyor, and then an automobile or a belt conveyor is transported to a slag yard outside a plant area.
In the prior art, a wet-process slag discharging process is adopted, gypsum is built for stockpiling, seepage water is collected in a water return pool and recycled by a pumping phosphoric acid system (a ball mill), and thus the water balance of the whole phosphoric acid system is formed.
The patent with the application number of CN 201921497866.2 discloses a comprehensive utilization system of phosphogypsum backwater, which comprises a phosphogypsum backwater storage tank, a neutralization reaction storage tank, a multi-stage neutralization reaction tank, a lime water storage tank, a settling tank, a filter press, a repulping tank and a filtrate storage tank; a cooling water inlet and a cooling water outlet of the phosphoric acid atmosphere condenser are respectively connected with a phosphogypsum backwater storage tank and a neutralization reaction storage tank through pipelines; the inlet of the multistage neutralization reaction tank is connected with a neutralization reaction storage tank and a lime water storage tank; the inlet of the settling tank is connected with the outlet of the multistage neutralization reaction tank through a pipeline, the slurry outlet of the settling tank is connected with the repulping tank through a pipeline, and the clear liquid outlet of the settling tank is connected with the inlet of the filter press and the ball mill through a pipeline; a filter residue outlet of the filter press is connected with the repulping tank through a pipeline, and a filtrate outlet of the filter press is connected with a filtrate storage tank through a pipeline; the filtrate storage tank is connected with a washing water inlet of the vacuum disc filter through a pipeline.
When the applicant adopts the system, the filtrate output from the filter press is usually room temperature, and the filtrate is usually heated before being used.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems, the embodiment of the utility model provides a recycling device of phosphogypsum backwater, which accelerates the neutralization and sedimentation process by various means, ensures that the filtrate after neutralization, sedimentation and filter pressing has higher temperature, and then is mixed with high-temperature recovery after heat exchange, ensures that the temperature of the backwater can reach more than 55 ℃, and can be directly used without heating; in addition, the filtrate has higher temperature, and the cleanliness of the filtrate is ensured to meet the use standard. The technical scheme is as follows:
the embodiment of the utility model provides a recycling device of phosphogypsum backwater, which comprises a neutralization reaction tank 1, a settling tank 2, a filter press 3, a repulping tank 4 and a slurry and slag collecting tank 5, wherein a phosphogypsum yard, a cooling tower, an atmospheric condenser, the neutralization reaction tank 1 and the settling tank 2 are sequentially connected through pipelines, a sediment outlet 7 of the settling tank 2 is connected with the slurry and slag collecting tank 5 through a pipeline, a filter residue outlet of the filter press 3 and the slurry and slag collecting tank 5 are both connected with the repulping tank 4 through pipelines, and the repulping tank 4 is connected with a slurry tank through a pipeline; the liquid outlet of the atmospheric condenser is connected with a hot water tank of a vacuum disc filter through a pipeline, the liquid outlet of the neutralization reaction tank 1 is connected with a feed inlet of a ball mill through a pipeline, an overflow port 6 of the settling tank 2 is connected with a feed inlet of a filter press 3 through a pipeline, and a turbid water outlet 8 is arranged in the middle of the side wall of the settling tank, the turbid water outlet 8 is connected with a secondary slurry tank 4 through a pipeline, and a filtrate outlet of the filter press 3 is connected with the hot water tank through a pipeline.
The settling tank 2 in the embodiment of the utility model comprises a tank body 9, a feeding pipe 10 on the tank body 9, an overflow port 6 at the upper part of the tank body 9, a sediment outlet 7 at the bottom of the tank body 9 and a plurality of turbid water outlets 8 which are arranged in parallel up and down in the middle of the side wall of the tank body 9; the inlet pipe 10 is vertically arranged and fixed at the top of the tank body 9, the lower end of the inlet pipe is connected with the middle part of the tank body 9, the upper end of the inlet pipe is connected with the neutralization reaction tank 1 through a pipeline, and the inlet pipe is positioned on one side of the tank body 9, which is far away from the turbid water outlet 8.
Preferably, the trough body 9 in the embodiment of the present invention is circular, and the lower part of the trough body is a conical structure 11 with a large top and a small bottom, the conical structure 11 is located below and adjacent to the lowest turbid water outlet 8, and the sediment outlet 7 is located at the bottom of the conical structure 11.
Preferably, the overflow port 6 and the turbid water outlets 8 in the embodiment of the present invention are located on the same side, each turbid water outlet 8 is provided with a control valve, and the number of the turbid water outlets 8 is greater than or equal to 3.
The slurry-residue collecting tank 5 in the embodiment of the utility model is arranged below the settling tank 2 and is internally provided with a stirrer, and the repulping tank 4 is arranged below the filter press 3 and is internally provided with a stirrer.
Specifically, the atmospheric condenser in the embodiment of the utility model is output in three ways, wherein the first way is connected with a water inlet of a water cooling tower through a pipeline with a valve, the second way is connected with a neutralization reaction tank 1 through a pipeline with a valve, and the third way is connected with a hot water tank through a pipeline with a valve.
Specifically, the neutralization reaction tank 1 in the embodiment of the utility model is output in two ways, wherein the first way is connected with the upper end of the feeding pipe 10 through a pipeline with a valve, and the second way is connected with the feeding hole of the ball mill through a pipeline with a valve.
The technical scheme provided by the embodiment of the utility model has the following beneficial effects: the embodiment of the utility model provides a recycling device of phosphogypsum backwater, which accelerates the neutralization and sedimentation process by various means (increasing the reaction temperature by exchanging heat with an atmospheric condenser, only adopting primary neutralization, reducing the consumption of sedimentation water, adding a flocculating agent, only performing filter pressing on overflowing clear water, optimizing the structure of a sedimentation tank and the like), ensures that the filtrate after neutralization, sedimentation and filter pressing has higher temperature, and then is recycled and mixed with the high temperature after heat exchange, ensures that the temperature of the backwater can reach more than 55 ℃, can be directly used without heating, and in addition, ensures that the filtrate has higher temperature and the cleanliness of the filtrate meets the use standard.
Drawings
FIG. 1 is a schematic block diagram of a device for recycling phosphogypsum backwater provided by an embodiment of the utility model;
FIG. 2 is a schematic view of a partial structure of a device for recycling phosphogypsum backwater provided by an embodiment of the utility model;
fig. 3 is a schematic structural view of a settling tank in an embodiment of the present invention.
In the figure: 1, a neutralization reaction tank, 2, a settling tank, 3, a filter press, 4 secondary slurry tanks, 5 slurry and slag collecting tanks, 6 overflow ports, 7 sediment outlets, 8 turbid water outlets, 9 tank bodies, 10 feeding pipes and 11 conical structures;
a is from an atmospheric condenser, B lime water, C to a ball mill, D flocculant, E to a hot water tank and F to a slurry tank.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1-3, the embodiment of the utility model provides a recycling device of phosphogypsum backwater, which comprises a neutralization reaction tank 1 (lime water is added to adjust the pH value to 6-7), a settling tank 2 (flocculating agent is added, the settling time is preferably less than 2 hours), and a filter pressing tankMachine 3 (for filter pressing, the filter area is 120m2And the compaction pressure is as follows: 20MPa, the working temperature is 100 ℃), a slurry re-slurry tank 4 (used for mixing filter residue, sediment and sedimentation turbid liquid to obtain ore slurry with the density meeting the requirement and convenient to convey), a slurry residue collecting tank 5 (used for collecting sediment discharged by the sedimentation tank 2), and the like, an ardealite storage yard (outputting ardealite backwater), a water cooling tower (a structure in a phosphoric acid preparation device), the system comprises an atmospheric condenser (a structure in a phosphoric acid preparation device and a water cooling tower form circulation, the temperature of phosphogypsum can reach 80 ℃ after backwater heat exchange), a neutralization reaction tank 1 and a settling tank 2 are sequentially connected through pipelines (a pump is arranged as required), a sediment outlet 7 of the settling tank 2 is connected with a slurry residue collecting tank 5 through a pipeline, a filter residue outlet and the slurry residue collecting tank 5 of a filter press 3 are both connected with a repulping tank 4 through pipelines (a pump is arranged as required), and the repulping tank 4 is connected with a slurry tank through a pipeline (a pump is arranged as required). The structure of the device is basically the same as that of the existing phosphogypsum backwater recycling device, and the difference is that: the liquid outlet of the atmospheric condenser in this embodiment is further connected to a hot water tank of the vacuum disc filter (providing washing water for the washing area of the vacuum disc filter, and having a better slightly acidic effect) through a pipeline (a pump is provided as required), the liquid outlet of the neutralization reaction tank 1 is further connected to the feed inlet of the ball mill through a pipeline (a pump is provided as required), the applicant finds that, for the ball mill, the pH value can be adjusted without settling), the overflow port 6 of the settling tank 2 (only the clear water at the upper part of the settling tank 2 is output, and the requirement can be met in a short time) is connected to the feed inlet of the filter press 3 through a pipeline, and the middle part of the side wall thereof is provided with a plurality of turbid water outlets 8 (preferably a plurality of outlets, which are divided into a plurality of regions, so as to reduce disturbance to the liquid in the settling tank 2 and ensure the settling effect), and the turbid water outlets 8 is connected to the reslurrying tank 4 through a pipeline (a pump is provided as required), the filtrate outlet of the filter press 3 is connected with a hot water tank through a pipeline (a pump is arranged as required, the pump is mixed with return water output by an atmospheric condenser to obtain washing water with the temperature of more than 55 ℃, the amount of the return water which is not settled in the washing water is less than 40 percent, and the washing effect of the vacuum disc filter still meets the requirement).
Referring to fig. 2 and 3, the settling tank 2 in the embodiment of the present invention includes a tank 9 (the top of which may be closed), a feeding pipe 10 (specifically, a circular pipe) on the tank 9, an overflow port 6 at the upper part of the tank 9, a sediment outlet 7 at the bottom of the tank 9, and a plurality of turbid water outlets 8 (located on the same vertical line) arranged in parallel up and down in the middle of the side wall of the tank 9. The inlet pipe 10 is vertically arranged and fixed at the top of the tank body 9, the lower end of the inlet pipe is connected to the middle of the tank body 9, the upper end (upwards penetrating out of the top of the tank body 9) of the inlet pipe is connected with the neutralization reaction tank 1 through a pipeline (simultaneously, a flocculating agent is added, and specifically, the inlet pipe is connected with a flocculating agent storage tank through a pipeline), and the inlet pipe is located on one side, away from the turbid water outlet 8, of the tank body 9 so as to reduce the disturbance of water inflow to water outflow. The muddy water outlets 8 are connected with a main pipe through a plurality of branch pipes, and the main pipe is connected with the reslurry tank 4.
Preferably, referring to fig. 2 and 3, the trough body 9 in the embodiment of the present invention is circular and has a conical structure 11 with a large upper part and a small lower part to ensure the sedimentation effect, the conical structure 11 is located adjacent to and below the lowest turbid water outlet 8, and the sediment outlet 7 is located at the bottom of the conical structure 11.
Preferably, referring to fig. 2 and 3, the overflow port 6 and the turbid water outlets 8 in the embodiment of the present invention are located on the same side, each turbid water outlet 8 is provided with a control valve, the number of the turbid water outlets 8 is greater than or equal to 3, and the plurality of turbid water outlets 8 can be uniformly distributed in the vertical direction.
Referring to fig. 2, the slurry-residue collecting tank 5 in the embodiment of the present invention is disposed below the settling tank 2 (to reduce the use of a pump) and has a stirrer disposed therein, and the slurry tank 4 is disposed below the filter press machine 3 (to reduce the use of a pump) and has a stirrer disposed therein.
Specifically, referring to fig. 1, the atmospheric condenser in the embodiment of the present invention is output in three ways, the first way is connected to the water inlet of the cooling tower through a pipeline with a valve (a pump is arranged as required), the second way is connected to the neutralization reaction tank 1 through a pipeline with a valve (a pump is arranged as required), and the third way is connected to the hot water tank through a pipeline with a valve (a pump is arranged as required).
Specifically, referring to fig. 1, the neutralization reaction tank 1 in the embodiment of the present invention is output in two ways, the first way is connected to the upper end of the feed pipe 10 through a pipe with a valve (a pump is provided as required), and the second way is connected to the feed port of the ball mill through a pipe with a valve (a pump is provided as required).
In addition, the washing rate of the vacuum disc filter can be improved to more than 99 percent, the phosphorus content in gypsum paste can be reduced to about 0.7 percent from more than 1.0 percent of the prior (phosphogypsum backwater is directly adopted in a hot water tank), the phosphorus content in the backwater is reduced to 0.3 percent, the phosphorus yield can be improved to a certain degree, the washing water of the hot water tank basically does not need to be heated, and steam or electric energy can be saved. The yields are shown in table 1:
TABLE 1
In this embodiment, "first", "second", and "third" only have a distinguishing function, and have no other special meaning. In the embodiment of the present invention, a pump, a valve, a flowmeter, and/or the like may be disposed on the pipeline between the structures as needed.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. The phosphogypsum backwater recycling device comprises a neutralization reaction tank (1), a settling tank (2), a pressure filter (3), a repulping tank (4) and a slurry residue collecting tank (5), wherein a phosphogypsum yard, a water cooling tower, an atmospheric condenser, the neutralization reaction tank (1) and the settling tank (2) are sequentially connected through pipelines, a sediment outlet (7) of the settling tank (2) is connected with the slurry residue collecting tank (5) through a pipeline, a filter residue outlet of the pressure filter (3) and the slurry residue collecting tank (5) are connected with the repulping tank (4) through pipelines, and the repulping tank (4) is connected with a slurry tank through a pipeline; the device is characterized in that a liquid outlet of the atmospheric condenser is connected with a hot water tank of a vacuum disc filter through a pipeline, a liquid outlet of the neutralization reaction tank (1) is connected with a feed inlet of a ball mill through a pipeline, an overflow port (6) of the settling tank (2) is connected with a feed inlet of a filter press (3) through a pipeline, a turbid water outlet (8) is arranged in the middle of the side wall of the settling tank, the turbid water outlet (8) is connected with a repulping tank (4) through a pipeline, and a filtrate outlet of the filter press (3) is connected with the hot water tank through a pipeline.
2. The device for recycling the backwater of the phosphogypsum as defined in claim 1, wherein the settling tank (2) comprises a tank body (9), a feeding pipe (10) arranged on the tank body (9), an overflow port (6) arranged at the upper part of the tank body (9), a sediment outlet (7) arranged at the bottom of the tank body (9) and a plurality of turbid water outlets (8) arranged in parallel up and down in the middle of the side wall of the tank body (9); the feeding pipe (10) is vertically arranged and fixed at the top of the tank body (9), the lower end of the feeding pipe is connected to the middle of the tank body (9), the upper end of the feeding pipe is connected with the neutralization reaction tank (1) through a pipeline, and the feeding pipe is located on one side, away from the turbid water outlet (8), of the tank body (9).
3. The phosphogypsum backwater recycling device according to claim 2, characterized in that the trough body (9) is circular and the lower part of the trough body is a conical structure (11) with a large upper part and a small lower part, the conical structure (11) is positioned below and adjacent to the turbid water outlet (8) at the lowest part, and the sediment outlet (7) is arranged at the bottom of the conical structure (11).
4. The phosphogypsum backwater recycling device according to claim 2, characterized in that the overflow port (6) and the turbid water outlets (8) are positioned on the same side, each turbid water outlet (8) is provided with a control valve, and the number of the turbid water outlets (8) is more than or equal to 3.
5. The phosphogypsum backwater recycling device according to claim 2, characterized in that the slurry-residue collecting tank (5) is arranged below the settling tank (2) and is internally provided with a stirrer, and the repulping tank (4) is arranged below the filter press (3) and is internally provided with a stirrer.
6. The device for recycling the phosphogypsum backwater as claimed in claim 1, wherein the atmospheric condenser is output in three ways, the first way is connected with the water inlet of the cooling tower through a pipeline with a valve, the second way is connected with the neutralization reaction tank (1) through a pipeline with a valve, and the third way is connected with the hot water tank through a pipeline with a valve.
7. The phosphogypsum backwater recycling device according to claim 2, characterized in that the neutralization reaction tank (1) is output in two ways, the first way is connected with the upper end of the feeding pipe (10) through a pipeline with a valve, and the second way is connected with the feeding port of the ball mill through a pipeline with a valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122591635.1U CN216377506U (en) | 2021-10-27 | 2021-10-27 | Recycling device for phosphogypsum backwater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122591635.1U CN216377506U (en) | 2021-10-27 | 2021-10-27 | Recycling device for phosphogypsum backwater |
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| Publication Number | Publication Date |
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| CN216377506U true CN216377506U (en) | 2022-04-26 |
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| CN202122591635.1U Active CN216377506U (en) | 2021-10-27 | 2021-10-27 | Recycling device for phosphogypsum backwater |
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| CN (1) | CN216377506U (en) |
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2021
- 2021-10-27 CN CN202122591635.1U patent/CN216377506U/en active Active
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