Treatment system for recycling phosphate from washed phosphorite concentrate liquid

Abstract

The utility model discloses a treatment system for recycling phosphate from washed phosphorite concentrate liquid, and belongs to the technical field of water treatment. The treatment system comprises a fluorine and impurity removal system, a calcium removal system, a primary desalination and concentration system and a fresh water desalination and concentration system, the calcium removal system comprises a calcium removal reaction tank and a second integrated flocculation reaction precipitation water purifier; the primary desalination and concentration system comprises a first RO (Reverse Osmosis) membrane system, a middle water tank, a primary fresh water tank and a primary concentrated water tank; and the fresh water desalination and concentration system comprises a second RO membrane system. The problems that washing phosphorite concentrate liquid treatment equipment usually needs an ultrafiltration device, the cost is high and the like are solved.

Description

Technical Field

[0001] The utility model relates to the field of wastewater treatment, in particular to a treatment system for recycling phosphate from water-washed phosphate concentrate liquid. Background Art

[0002] A large amount of industrial clean water and industrial wastewater are required in the mineral processing process. The wastewater contains a large amount of useful phosphate resources, as well as iron, aluminum, lead and other heavy metal compounds, which will cause heavy metal pollution and poison microorganisms. The existing water-washed phosphate concentrate liquid treatment equipment usually requires the use of ultrafiltration devices, which are complex, occupy a large area, and have high costs for treating water-washed phosphate concentrate liquid. Utility Model Content

[0003] In order to solve at least one of the problems in the above background, the utility model provides a processing system for recovering phosphate from water-washed phosphate concentrate liquid.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The treatment system for recovering phosphate from water-washed phosphate concentrate includes:

[0006] Fluorine removal and impurity removal system, calcium removal system, primary desalination and concentration system and fresh water desalination and concentration system;

[0007] The defluorination and impurity removal system comprises a defluorination and impurity removal reaction tank and a first integrated flocculation reaction precipitation water purifier;

[0008] The decalcification system includes a decalcification reaction tank and a second integrated flocculation reaction precipitation water purifier;

[0009] The primary desalination and concentration system comprises a first RO membrane system, an intermediate water tank, a primary fresh water tank and a primary concentrated water tank;

[0010] The fresh water desalination and concentration system includes a second RO membrane system;

[0011] The liquid outlet of the defluorination and impurity removal reaction tank is connected to the liquid inlet of the first integrated flocculation reaction precipitation water purifier through a pipeline, and the liquid outlet of the first integrated flocculation reaction precipitation water purifier is connected to the liquid inlet of the decalcification reaction tank through a pipeline;

[0012] The liquid outlet of the decalcification system is connected to the liquid inlet of the second integrated flocculation reaction precipitation water purifier through a pipeline, and the liquid outlet of the second integrated flocculation reaction precipitation water purifier is connected to the liquid inlet of the intermediate water tank through a pipeline;

[0013] The liquid outlet of the intermediate water tank is connected to the liquid inlet of the first RO membrane system through a pipeline, the fresh water outlet of the first RO membrane system is connected to the primary fresh water tank through a pipeline, the primary fresh water tank is connected to the liquid inlet of the second RO membrane system through a pipeline, and the concentrated water outlet of the second RO membrane system is connected to the liquid inlet of the decalcification reaction tank through a pipeline;

[0014] The filtration accuracy of the fresh water desalination and concentration system is less than that of the first-stage desalination and concentration system.

[0015] According to one embodiment of the utility model, the defluorination and impurity removal reaction tank includes a first three-grid baffled reaction zone; a first paddle stirrer is installed inside each grid of the defluorination and impurity removal reaction tank; and a cationic alkali dosing device and a polycarboxylic acid water reducer device are installed in the first grid of the defluorination and impurity removal reaction tank.

[0016] According to one embodiment of the utility model, a flocculant dosing device is installed on the water inlet pipe of the first integrated flocculation reaction sedimentation water purifier, and the dosing device is used to add flocculant; a first central tube and a first sludge collection chamber are arranged in the middle of the first integrated flocculation reaction sedimentation water purifier, the first sludge collection chamber is connected to the sludge collection tank, and the sludge collection tank is connected to the sludge filter press system; a first inclined tube sedimentation area and a first filtration area are also arranged at the upper end of the first integrated flocculation reaction sedimentation water purifier, as well as a first supernatant discharge pipe connected to the intermediate water tank.

[0017] According to an embodiment of the utility model, the decalcification reaction tank comprises a second three-grid baffled reaction zone; a second paddle stirrer is installed inside each grid of the decalcification reaction tank; and a cationic alkali dosing device is provided in the first grid of the decalcification reaction tank.

[0018] According to an embodiment of the utility model, the liquid inlet of the decalcification reaction tank is located in the first compartment of the decalcification reaction tank, and the liquid outlet of the decalcification reaction tank is located in the third compartment of the decalcification reaction tank.

[0019] According to one embodiment of the utility model, the second three-grid baffle reaction zone includes a first baffle, a second baffle and a third baffle, and the first baffle, the second baffle and the third baffle are sequentially arranged inside the decalcification reaction tank, wherein the first baffle and the third baffle are connected to the top of the decalcification reaction tank, and the first baffle and the third baffle are spaced apart from the bottom of the decalcification reaction tank, and the second baffle is connected to the bottom of the decalcification reaction tank 300, and the second baffle is spaced apart from the top of the decalcification reaction tank.

[0020] According to one embodiment of the utility model, a flocculant dosing device is installed on the water inlet pipe of the second integrated flocculation reaction sedimentation water purifier;

[0021] A second central tube and a second sludge collecting chamber are arranged in the middle of the second integrated flocculation reaction sedimentation water purifier, the second sludge collecting chamber is connected to the sludge collecting tank, and the sludge collecting tank is connected to the sludge filter press system; a second inclined tube sedimentation area and a second filtration area are also arranged at the upper end of the first integrated flocculation reaction sedimentation water purifier, as well as a supernatant discharge pipe connected to the intermediate water tank.

[0022] According to an embodiment of the utility model, a chemical cleaning system is included, and the chemical cleaning system is respectively connected to the primary desalination and concentration system and the fresh water desalination and concentration system.

[0023] According to an embodiment of the utility model, both the primary desalination and concentration system and the fresh water desalination and concentration system are connected to a scale inhibitor dosing system; the fresh water desalination and concentration system is also provided with an acid dosing pipeline.

[0024] According to an embodiment of the utility model, the membrane elements selected in the primary desalination and concentration system are all special anti-pollution and acid-resistant reverse osmosis membranes; the membrane elements selected in the fresh water desalination and concentration system are PVDF reverse osmosis membranes.

[0025] Compared with the prior art, the utility model has achieved the following beneficial effects:

[0026] 1. The utility model adopts a first integrated flocculation reaction sedimentation water purifier and a second integrated flocculation reaction sedimentation water purifier. The system is highly integrated, the water output effect is good, the ultrafiltration system is omitted, and cost reduction and efficiency improvement are achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The schematic diagram of the structure of the treatment system for recycling phosphate in the water-washed phosphate concentrate liquid of the utility model is shown;

[0028] Figure 2 Show the utility model Figure 1 A in the figure is an enlarged structural diagram.

[0029] Reference numerals: 100-fluorine removal and impurity removal reaction tank; 200-first integrated flocculation reaction sedimentation water purifier; 201-first central tube; 202-first sludge collection chamber; 203-first inclined tube sedimentation area; 204-first filtration area; 300-calcification removal reaction tank; 400-second integrated flocculation reaction sedimentation water purifier; 401-second central tube; 402-second sludge collection chamber; 403-second inclined tube sedimentation area; 404-second filtration area; 4041- Filtration layer; 4042-flat membrane; 500-intermediate water tank; 600-first RO membrane system; 700-primary fresh water tank; 800-primary concentrated water tank; 900-second RO membrane system; 110-scaling agent dosing system; 120-alkali neutralization system; 130-chemical cleaning system; 140-sludge collection tank; 150-sludge filter press system; 160-cationic alkali dosing device; 170-polycarboxylic acid water reducer device; 180-flocculant dosing device. DETAILED DESCRIPTION

[0030] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, rather than implying any limitation on the scope of the present disclosure.

[0031] As used herein, the term "including" and its variants are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like is based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate an orientation or position relationship, some of the above terms may also be used to indicate other meanings, such as the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances. In addition, the terms "install", "set", "provided with", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0032] Specifically, Figure 1 As shown, this embodiment provides a processing system for recovering phosphate from water-washed phosphate concentrate, including:

[0033] Fluorine removal and impurity removal system, calcium removal system, primary desalination and concentration system and fresh water desalination and concentration system;

[0034] The defluorination and impurity removal system comprises a defluorination and impurity removal reaction tank 100 and a first integrated flocculation reaction precipitation water purifier 200;

[0035] The decalcification system includes a decalcification reaction tank 300 and a second integrated flocculation reaction precipitation water purifier 400;

[0036] The primary desalination and concentration system includes a first RO membrane system 600, an intermediate water tank 500, a primary fresh water tank 700 and a primary concentrated water tank 800;

[0037] The fresh water desalination and concentration system includes a second RO membrane system 900;

[0038] The liquid outlet of the defluorination and impurity removal reaction tank 100 is connected to the liquid inlet of the first integrated flocculation reaction precipitation water purifier 200 through a pipeline, and the liquid outlet of the first integrated flocculation reaction precipitation water purifier 200 is connected to the liquid inlet of the decalcification reaction tank 300 through a pipeline;

[0039] The liquid outlet of the decalcification system is connected to the liquid inlet of the second integrated flocculation reaction precipitation water purifier 400 through a pipeline, and the liquid outlet of the second integrated flocculation reaction precipitation water purifier 400 is connected to the liquid inlet of the intermediate water tank 500 through a pipeline;

[0040] The liquid outlet of the intermediate water tank 500 is connected to the liquid inlet of the first RO membrane system 600 through a pipeline, the fresh water outlet of the first RO membrane system 600 is connected to the primary fresh water tank 700 through a pipeline, the primary fresh water tank 700 is connected to the liquid inlet of the second RO membrane system 900 through a pipeline, and the concentrated water outlet of the second RO membrane system 900 is connected to the liquid inlet of the decalcification reaction tank 300 through a pipeline;

[0041] The filtration accuracy of the fresh water desalination and concentration system is less than that of the first-stage desalination and concentration system.

[0042] When carrying out this embodiment, the fluorine removal and impurity removal reaction tank 100, the calcium removal reaction tank 300, the intermediate water tank 500, the primary fresh water tank 700, the primary concentrated water tank 800 and are all provided with a liquid inlet and a liquid outlet. The first integrated flocculation reaction sedimentation water purifier 200 and the second integrated flocculation reaction sedimentation water purifier 400 are both provided with a liquid inlet, a liquid outlet and a sludge outlet. The first RO membrane system 600 is provided with a liquid inlet and a fresh water outlet, and the second RO membrane system 900 is provided with a liquid inlet, a fresh water outlet and a concentrated water outlet. The liquid outlet of the fluorine removal and impurity removal reaction tank 100 is connected to the liquid inlet of the first integrated flocculation reaction precipitation water purifier 200 through a pipeline, the liquid outlet of the first integrated flocculation reaction precipitation water purifier 200 is connected to the liquid inlet of the decalcification reaction tank 300 through a pipeline, the liquid outlet of the decalcification reaction tank 300 is connected to the liquid inlet of the second integrated flocculation reaction precipitation water purifier 400 through a pipeline, the liquid outlet of the second integrated flocculation reaction precipitation water purifier 400 is connected to the liquid inlet of the intermediate water tank 500 through a pipeline, the liquid outlet of the intermediate water tank is connected to the liquid inlet of the first RO membrane system 600 through a pipeline, the fresh water outlet of the first RO membrane system 600 is connected to the liquid inlet of the primary fresh water tank 700 through a pipeline, and the concentrated water outlet of the first RO membrane system 600 is connected to the liquid inlet of the primary concentrated water tank 800 through a pipeline. The liquid outlet of the primary fresh water tank 700 is connected to the liquid inlet of the second RO membrane system 900 through a pipeline, and the concentrated water outlet of the second RO membrane system 900 is connected to the liquid inlet of the decalcification reaction tank 300 through a pipeline.

[0043] In this embodiment, the first integrated flocculation reaction precipitation water purifier 200 and the second integrated flocculation reaction precipitation water purifier 400 are convenient for separating sludge from water, and for recovering resources such as fluoride and ions in the sludge. The first integrated flocculation reaction precipitation water purifier 200, the second integrated flocculation reaction precipitation water purifier 400, the first RO membrane system 600 and the second RO membrane system 900 are arranged in coordination to improve the water quality standard. The setting of multiple water pools is convenient for storing water transported from the upstream device and transporting the water to the downstream device, thereby improving work efficiency. The setting of the filtration accuracy of the fresh water desalination and concentration system is less than the filtration accuracy of the primary desalination and concentration system, further improving the water quality standard. The setting of the treatment system for recycling phosphate by washing phosphate concentrate liquid in this embodiment increases the system integration, does not require complex equipment and large-scale civil engineering, and is easy to form modularization for large-scale production.

[0044] In some embodiments, the first RO membrane system 600 is provided with a concentrate outlet.

[0045] In some embodiments, the second RO membrane system 900 is provided with a fresh water outlet.

[0046] According to one embodiment of the utility model, Figure 1As shown, the defluorination and impurity removal reaction tank 100 includes a first three-grid baffled reaction zone 101; a first paddle stirrer 102 is installed inside each grid of the defluorination and impurity removal reaction tank 100; and a cationic alkali dosing device 160 and a polycarboxylic acid water reducer device 170 are installed in the first grid of the defluorination and impurity removal reaction tank 100.

[0047] In this embodiment, by setting the first three-grid baffle reaction zone 101, the opportunity of the cationic base and the polycarboxylic acid water reducer to fully mix and contact with the water-washed phosphate ore concentrate liquid is increased, so that the uniformity of the mixing is better. By setting the first paddle agitator 102, the rate of the cationic base and the polycarboxylic acid water reducer to fully mix with the water-washed phosphate ore concentrate liquid is promoted. The cationic base dosing device 160 and the polycarboxylic acid water reducer device 170 are installed in the first grid of the defluorination and impurity removal reaction tank 100, so that the water-washed phosphate ore concentrate liquid can be immediately contacted with the cationic base and the polycarboxylic acid water reducer after entering the defluorination and impurity removal reaction tank 100, further improving the efficiency of the cationic base and the polycarboxylic acid water reducer to fully mix with the water-washed phosphate ore concentrate liquid.

[0048] In some embodiments, the liquid inlet of the defluorination and impurity removal reaction tank 100 is located in the first compartment of the defluorination and impurity removal reaction tank 100, and the liquid outlet of the defluorination and impurity removal reaction tank 100 is located in the third compartment of the defluorination and impurity removal reaction tank 100. When the water-washed phosphate ore concentrate liquid enters the second compartment and the third compartment in sequence from the first compartment, the water-washed phosphate ore concentrate liquid has more opportunities to mix with the cationic base and the polycarboxylic acid water reducer, further improving the efficiency of the full mixing of the cationic base and the polycarboxylic acid water reducer with the water-washed phosphate ore concentrate liquid.

[0049] In some embodiments, the first three-grid baffle reaction zone 101 includes a first baffle, a second baffle and a third baffle, which are sequentially arranged inside the defluorination and impurity removal reaction tank 100, wherein the first baffle and the third baffle are connected to the top of the defluorination and impurity removal reaction tank 100, the first baffle and the third baffle are spaced from the bottom of the defluorination and impurity removal reaction tank 100, the second baffle is connected to the bottom of the defluorination and impurity removal reaction tank 100, and the second baffle is spaced from the top of the defluorination and impurity removal reaction tank 100. Thus, when the water-washed phosphate ore concentrate liquid enters the second and third grids from the first grid in sequence, the water-washed phosphate ore concentrate liquid has more opportunities to obtain the cationic base and the polycarboxylic acid water reducer, further improving the efficiency of the cationic base and the polycarboxylic acid water reducer with the water-washed phosphate ore concentrate liquid.

[0050] According to one embodiment of the utility model, Figure 1As shown, a flocculant dosing device 180 is installed on the water inlet pipe of the first integrated flocculation reaction sedimentation water purifier 200, and the dosing device is used to add flocculants; a first central tube 201 and a first sludge collection chamber 202 are arranged in the middle of the first integrated flocculation reaction sedimentation water purifier 200, and the first sludge collection chamber 202 is connected to the sludge collection tank 140, and the sludge collection tank 140 is connected to the sludge filter press system 150. The first integrated flocculation reaction sedimentation water purifier 200 is also provided with a first inclined tube sedimentation area 203 and a first filtration area 204 at the upper end, as well as a supernatant discharge pipe connected to the intermediate water tank 500.

[0051] In this embodiment, by installing a dosing device on the water inlet pipe of the first integrated flocculation reaction precipitation water purifier 200, it is convenient for the flocculant and water to enter the first integrated flocculation reaction precipitation water purifier 200, and the impact force generated by the water entering the water purifier can promote the flocculation reaction between the flocculant and the water. The setting of the first central tube 201 facilitates the introduction of the sludge containing flocs in the water purifier into the first sludge collection chamber 202, so that when the sludge is discharged, the clean water in the water purifier is not also discharged. Therefore, when the sludge is discharged, the clean water is not disturbed, which improves the working efficiency of the water purification and ensures the water quality standard of the clean water. Further, the first sludge collection chamber 202 is connected to the sludge collection tank 140, and the sludge collection tank 140 is connected to the sludge filter press system 150, which can facilitate the recycling of the sludge. Through the setting of the first inclined tube sedimentation area 203 and the first filtration area 204, the water quality standard of the clean water is further improved.

[0052] In some embodiments, the first filter zone 204 includes a filter layer to remove solid impurities and the like in water to improve water quality.

[0053] According to one embodiment of the utility model, Figure 1 As shown, the decalcification reaction tank 300 includes a second three-grid baffled reaction zone 301; a second paddle stirrer 302 is installed inside each grid of the decalcification reaction tank 300; and a cationic base dosing device 160 is provided in the first grid of the decalcification reaction tank 300.

[0054] In this embodiment, by setting the second three-grid baffle reaction zone 301, the opportunity of the cationic base and the polycarboxylate water reducer to fully mix and contact with the water-washed phosphate ore concentrate liquid is increased, so that the uniformity of the mixing is better. By setting the second paddle agitator 302, the rate of the cationic base and the polycarboxylate water reducer to fully mix with the water-washed phosphate ore concentrate liquid is promoted. The cationic base dosing device 160 and the polycarboxylate water reducer device 170 are installed in the first grid of the decalcification reaction tank 300, so that the water-washed phosphate ore concentrate liquid can be immediately contacted with the cationic base and the polycarboxylate water reducer after entering the decalcification reaction tank 300, further improving the efficiency of the cationic base and the polycarboxylate water reducer to fully mix with the water-washed phosphate ore concentrate liquid.

[0055] In some embodiments, the liquid inlet of the decalcification reaction tank 300 is located in the first compartment of the decalcification reaction tank 300, and the liquid outlet of the decalcification reaction tank 300 is located in the third compartment of the decalcification reaction tank 300. When the water-washed phosphate ore concentrate liquid enters the second compartment and the third compartment in sequence from the first compartment, the water-washed phosphate ore concentrate liquid has more opportunities to mix with the cationic base and the polycarboxylic acid water reducer, further improving the efficiency of the full mixing of the cationic base and the polycarboxylic acid water reducer with the water-washed phosphate ore concentrate liquid.

[0056] In some embodiments, the second three-grid baffle reaction zone 301 includes a first baffle, a second baffle and a third baffle, which are sequentially arranged inside the decalcification reaction tank 300, wherein the first baffle and the third baffle are connected to the top of the decalcification reaction tank 300, the first baffle and the third baffle are spaced from the bottom of the decalcification reaction tank 300, the second baffle is connected to the bottom of the decalcification reaction tank 300, and the second baffle is spaced from the top of the decalcification reaction tank 300. Thus, when the water-washed phosphate ore concentrate liquid enters the second and third grids sequentially from the first grid, the water-washed phosphate ore concentrate liquid has more opportunities to mix with the cationic base and the polycarboxylic acid water reducer, further improving the efficiency of the cationic base and the polycarboxylic acid water reducer with the water-washed phosphate ore concentrate liquid.

[0057] According to one embodiment of the utility model, Figure 1-2 As shown, a flocculant dosing device 180 is installed on the water inlet pipe of the second integrated flocculation reaction sedimentation water purifier 400;

[0058] A second central tube 401 and a second sludge collection chamber 402 are arranged in the middle of the second integrated flocculation reaction sedimentation water purifier 400, and the second sludge collection chamber 402 is connected to the sludge collection tank 140, and the sludge collection tank 140 is connected to the sludge filter press system 150; the upper end of the second integrated flocculation reaction sedimentation water purifier 400 is also provided with an inclined tube sedimentation area 403 and an MBR membrane filtration area 404, as well as a supernatant discharge pipe connected to the intermediate water tank 500.

[0059] In this embodiment, by installing a dosing device on the water inlet pipe of the second integrated flocculation reaction precipitation water purifier 400, it is convenient for the flocculant and water to enter the second integrated flocculation reaction precipitation water purifier 400, and the impact force generated by the water entering the water purifier can promote the flocculation reaction between the flocculant and the water. The setting of the second central tube 401 facilitates the introduction of the sludge containing flocs in the water purifier into the second sludge collection chamber 402, so that when the sludge is discharged, the clean water in the water purifier is not also discharged. Therefore, when the sludge is discharged, the clean water is not disturbed, which improves the working efficiency of the water purification and ensures the water quality standard of the clean water. Further, the second sludge collection chamber 402 is connected to the sludge collection tank 140, and the sludge collection tank 140 is connected to the sludge filter press system 150, which can facilitate the recycling of the sludge. Through the setting of the second inclined tube sedimentation area 403 and the second filtration area 404, the water quality standard of the clean water is further improved.

[0060] In some embodiments, Figure 2 As shown, the second filter area 404 includes a filter layer 4041 and a flat membrane 4042. The flat membrane 4042 is disposed above the filter layer 4041. The water in the second integrated flocculation reaction sedimentation water purifier 400 first passes through the filter layer 4041 and then passes through the flat membrane 4042. The filter layer 4041 and the flat membrane 4042 cooperate to filter the water in the second integrated flocculation reaction sedimentation water purifier 400, further improving the water quality standard.

[0061] Preferably, the flat sheet membrane is a MBR membrane.

[0062] According to one embodiment of the utility model, Figure 1 As shown, it includes a chemical cleaning system 130, and the chemical cleaning system 130 is respectively connected to the primary desalination and concentration system and the fresh water desalination and concentration system.

[0063] In this embodiment, by setting up the chemical cleaning system 130, the primary desalination and concentration system and the fresh water desalination and concentration system can be cleaned.

[0064] According to one embodiment of the utility model, Figure 1 As shown, both the primary desalination and concentration system and the fresh water desalination and concentration system are connected to the antiscalant dosing system 110; the fresh water desalination and concentration system is also provided with an acid dosing pipeline.

[0065] In this embodiment, the scaling degree of the primary desalination and concentration system and the fresh water desalination and concentration system is reduced by setting the antiscalant dosing system 110. The setting of the acid dosing pipeline makes the fresh water desalination and concentration system in acidic conditions during operation, reducing the amount of reagents added.

[0066] According to an embodiment of the utility model, the membrane elements selected in the primary desalination and concentration system are all special anti-pollution and acid-resistant reverse osmosis membranes; the membrane elements selected in the fresh water desalination and concentration system are PVDF reverse osmosis membranes.

[0067] In this embodiment, a first-stage desalination and concentration system using a special anti-pollution and acid-resistant reverse osmosis membrane is used for multi-stage quality-based desalination and concentration, and no new impurities are introduced, so that the final second fresh water can meet the requirements of washing water or desalted water source, and at the same time, the first concentrated water has a high concentration ratio and can be well reused in the production process. The membrane element selected in the fresh water desalination and concentration system is a PVDF reverse osmosis membrane, which increases the pollution resistance of the fresh water desalination and concentration system.

[0068] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the utility model. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) by each other to form a technical solution.

[0069] It should be understood that the size of the serial number of each step in the utility model content and the embodiment of the utility model does not absolutely mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the utility model. For the purpose of example and description, the foregoing description of the implementation of the present disclosure has been given. The foregoing description is not exhaustive and is not intended to limit the present disclosure to the exact form disclosed. According to the above teachings, there may be various deformations and modifications, or various deformations and modifications may be obtained from the practice of the present disclosure. These embodiments are selected and described to illustrate the principles of the present disclosure and its practical application, so that those skilled in the art can use the present disclosure in various embodiments and various modifications for the specific purpose suitable for the conception.

Claims

1. A treatment system for recovering phosphate from water-washed phosphate concentrate, characterized in that: include: Fluorine removal and impurity removal system, calcium removal system, primary desalination and concentration system and fresh water desalination and concentration system; The defluorination and impurity removal system comprises a defluorination and impurity removal reaction tank and a first integrated flocculation reaction precipitation water purifier; The decalcification system includes a decalcification reaction tank and a second integrated flocculation reaction precipitation water purifier; The primary desalination and concentration system comprises a first RO membrane system, an intermediate water tank, a primary fresh water tank and a primary concentrated water tank; The fresh water desalination and concentration system includes a second RO membrane system; The liquid outlet of the defluorination and impurity removal reaction tank is connected to the liquid inlet of the first integrated flocculation reaction precipitation water purifier through a pipeline, and the liquid outlet of the first integrated flocculation reaction precipitation water purifier is connected to the liquid inlet of the decalcification reaction tank through a pipeline; The liquid outlet of the decalcification system is connected to the liquid inlet of the second integrated flocculation reaction precipitation water purifier through a pipeline, and the liquid outlet of the second integrated flocculation reaction precipitation water purifier is connected to the liquid inlet of the intermediate water tank through a pipeline; The liquid outlet of the intermediate water tank is connected to the liquid inlet of the first RO membrane system through a pipeline, the fresh water outlet of the first RO membrane system is connected to the primary fresh water tank through a pipeline, the primary fresh water tank is connected to the liquid inlet of the second RO membrane system through a pipeline, and the concentrated water outlet of the second RO membrane system is connected to the liquid inlet of the decalcification reaction tank through a pipeline; The filtration accuracy of the fresh water desalination and concentration system is less than that of the first-stage desalination and concentration system.

2. The system for recovering phosphate from water-washed phosphate concentrate according to claim 1, characterized in that: The defluorination and impurity removal reaction tank comprises a first three-grid baffled reaction zone; a first paddle stirrer is installed inside each grid of the defluorination and impurity removal reaction tank; and a cationic alkali dosing device and a polycarboxylic acid water reducer device are installed in the first grid of the defluorination and impurity removal reaction tank.

3. The processing system for recovering phosphate from water-washed phosphate concentrate according to claim 1, characterized in that: A flocculant dosing device is installed on the water inlet pipe of the first integrated flocculation reaction sedimentation water purifier, and the dosing device is used to add flocculants; a first central tube and a first sludge collection chamber are arranged in the middle of the first integrated flocculation reaction sedimentation water purifier, the first sludge collection chamber is connected to the sludge collection tank, and the sludge collection tank is connected to the sludge filter press system; a first inclined tube sedimentation area and a first filtration area are also arranged at the upper end of the first integrated flocculation reaction sedimentation water purifier, as well as a first supernatant discharge pipe connected to the intermediate water tank.

4. The system for recovering phosphate from water-washed phosphate concentrate according to claim 1, characterized in that: The decalcification reaction tank comprises a second three-grid baffled reaction zone; a second paddle stirrer is installed inside each grid of the decalcification reaction tank; and a cationic alkali dosing device is provided in the first grid of the decalcification reaction tank.

5. The system for recovering phosphate from water-washed phosphate concentrate according to claim 4, characterized in that: The liquid inlet of the decalcification reaction tank is located at the first grid of the decalcification reaction tank, and the liquid outlet of the decalcification reaction tank is located at the third grid of the decalcification reaction tank.

6. The system for recovering phosphate from water-washed phosphate concentrate according to claim 4, characterized in that: The second three-grid baffle reaction zone includes a first baffle, a second baffle and a third baffle, which are sequentially arranged inside the decalcification reaction tank, wherein the first baffle and the third baffle are connected to the top of the decalcification reaction tank, and the first baffle and the third baffle are spaced apart from the bottom of the decalcification reaction tank, and the second baffle is connected to the bottom of the decalcification reaction tank, and the second baffle is spaced apart from the top of the decalcification reaction tank.

7. The processing system for recovering phosphate from water-washed phosphate concentrate according to claim 1, characterized in that: A flocculant dosing device is installed on the water inlet pipe of the second integrated flocculation reaction sedimentation water purifier; A second central tube and a second sludge collecting chamber are arranged in the middle of the second integrated flocculation reaction sedimentation water purifier, the second sludge collecting chamber is connected to the sludge collecting tank, and the sludge collecting tank is connected to the sludge filter press system; a second inclined tube sedimentation area and a second filtration area are also arranged at the upper end of the first integrated flocculation reaction sedimentation water purifier, as well as a second supernatant discharge pipe connected to the intermediate water tank.

8. The system for recovering phosphate from water-washed phosphate concentrate according to claim 1, characterized in that: It comprises a chemical cleaning system, which is respectively connected with the primary desalination and concentration system and the fresh water desalination and concentration system.

9. The system for recovering phosphate from water-washed phosphate concentrate according to claim 1, characterized in that: The primary desalination and concentration system and the fresh water desalination and concentration system are both connected with a scale inhibitor dosing system; the fresh water desalination and concentration system is also provided with an acid dosing pipeline.

10. The system for recovering phosphate from water-washed phosphate concentrate according to claim 1, characterized in that: The membrane elements selected in the primary desalination and concentration system are all special anti-pollution and acid-resistant reverse osmosis membranes; the membrane elements selected in the fresh water desalination and concentration system are PVDF reverse osmosis membranes.

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