CN109110967B - Bauxite beneficiation wastewater recycling system and method based on membrane chemical reactor - Google Patents
Bauxite beneficiation wastewater recycling system and method based on membrane chemical reactor Download PDFInfo
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Abstract
The embodiment of the invention provides a system and a method for recycling bauxite beneficiation wastewater based on a membrane chemical reactor, wherein the system comprises: the device comprises an air floatation device, a membrane chemical reactor and a reverse osmosis-nanofiltration treatment system; wherein, the membrane chemical reactor includes: a coagulation reaction device and a microfiltration membrane filter; the microfiltration membrane filter includes: a water production area, a filtering area, a water distribution area, a slag storage area and a constant-pressure backwashing device; the reverse osmosis-nanofiltration treatment system comprises: a reverse osmosis device and a nanofiltration device. The system and the method for recycling the bauxite beneficiation wastewater based on the membrane chemical reactor, provided by the embodiment of the invention, can improve the bauxite beneficiation circulating water to ensure sustainable utilization of the bauxite beneficiation circulating water, and can improve the bauxite concentrate yield and the concentrate aluminum-silicon ratio by serving bauxite flotation.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a bauxite beneficiation wastewater recycling system and method based on a membrane chemical reactor.
Background
In China, a large amount of mineral processing wastewater can be generated in the process of improving the aluminum-silicon ratio by flotation and desilicication of the diasporic bauxite with low aluminum-silicon ratio. In order to improve the utilization rate of water resources and reduce the pollution caused by the discharge of industrial wastewater, the beneficiation wastewater needs to be treated and recycled to the flotation process.
Actually, bauxite ore dressing wastewater is generally treated by adding chemicals such as flocculant and the like to settle and separate suspended matters such as bauxite and the like in the wastewater, filter-pressing the suspended matters at the lower layer to obtain concentrate and tailings, and refluxing supernatant to the flotation process for recycling.
However, the following problems still exist in such a process:
along with the simple recycling of bauxite beneficiation wastewater, the chemicals used in the flotation process are gradually accumulated in the system, so that the composition of beneficiation backwater is very complex, the bauxite beneficiation index can be seriously influenced, the system cannot run for a long time, and the system becomes a bottleneck restricting the development of the bauxite industry.
In detail, the residual flocculant in the bauxite beneficiation circulating water not only easily flocculates the minerals and makes the minerals difficult to separate, resulting in deterioration of flotation results, but also Ca in the bauxite beneficiation circulating water2+、Mg2+And Al3+Inorganic salts can also react with bauxite flotation reagents to generate insoluble precipitates, which cause non-selective agglomeration in the flotation process and influence the beneficiation index.
Therefore, the bauxite beneficiation circulating water needs to be deeply treated by using a membrane process, and the requirement of treating and recycling favorable beneficiation indexes is met. In a key point, the collecting agent added in the bauxite flotation process and the mineral separation agents such as polyacrylamide added in the sedimentation link have higher and more complex organic matter content in mineral separation water, and increase the difficulty in desalination treatment by using a membrane process. Meanwhile, for the mineral soil with medium-low aluminum-silicon ratio, the monohydrated bauxite is mostly kaolinite type, the bauxite source soil is mostly kaolinite, and the viscous kaolinite contained in the bauxite circulating water increases the treatment difficulty of the membrane process again.
Disclosure of Invention
The embodiment of the invention aims to provide a bauxite beneficiation wastewater recycling system and method based on a membrane chemical reactor, so as to improve the beneficiation index of bauxite. The specific technical scheme is as follows:
in a first aspect, an embodiment of the present invention provides a system for recycling bauxite beneficiation wastewater based on a membrane chemical reactor, including: the device comprises an air floatation device, a membrane chemical reactor and a reverse osmosis-nanofiltration treatment system;
the air floatation device comprises: a dissolved air device and an air-float dosing device;
the membrane chemical reactor includes: a coagulation reaction device and a microfiltration membrane filter; the water outlet end of the coagulation reaction device is connected with the water inlet end of the microfiltration membrane filter; a coagulation reaction dosing device is arranged at the water inlet end of the coagulation reaction device;
the microfiltration membrane filter includes: a water production area, a filtering area, a water distribution area, a slag storage area and a constant-pressure backwashing device; a microfiltration membrane component is arranged in the filtering area; a first lifting pump is arranged on a water inlet pipeline of the micro-filtration membrane filter;
the reverse osmosis-nanofiltration treatment system comprises: a reverse osmosis device and a nanofiltration device; the water inlet end of the reverse osmosis device is connected with the water outlet end of the membrane chemical reactor; and the concentrated water outlet end of the reverse osmosis device is connected with the water inlet end of the nanofiltration device.
Optionally, the water producing area is arranged at the upper part of the microfiltration membrane filter; the residue storage area is arranged at the bottom of the microfiltration membrane filter.
Optionally, the microfiltration membrane filter is an immersion filter; the aperture of the microfiltration membrane component is 0.1-0.4 mu m; the microfiltration membrane component adopts a tube bag type, a tube type or a hollow fiber microfiltration membrane; the microfiltration membrane component is made of the following materials: at least one of polytetrafluoroethylene, ethylene chlorotrifluoroethylene copolymer, perfluoroethylene propylene copolymer, perfluoropropyl perfluorovinyl ether polytetrafluoroethylene copolymer, and polyvinylidene fluoride.
Optionally, a stirrer is further arranged in the coagulation reaction device.
Optionally, the water production outlet end of the reverse osmosis device and the water production outlet end of the nanofiltration device are both connected with a process water production tank.
Optionally, a pipeline at the water inlet end of the reverse osmosis device is sequentially connected with a second lift pump, a first safety filter and a booster pump; a third lifting pump and a second security filter are sequentially connected to a pipeline at the water inlet end of the nanofiltration device; and the concentrated water outlet end of the reverse osmosis device is also provided with a concentrated water tank, and the water outlet end of the concentrated water tank is communicated with the third lift pump.
In a second aspect, an embodiment of the present invention further provides a method for recycling bauxite beneficiation wastewater, which is applied to the bauxite beneficiation wastewater recycling system based on the membrane chemical reactor provided in the first aspect, and includes:
step A, introducing the bauxite beneficiation wastewater into an air flotation device, adding polyaluminium chloride and polyacrylamide into the air flotation device through an air flotation dosing device, introducing gas into the air flotation device through a gas dissolving device, and treating the bauxite beneficiation wastewater;
b, introducing the air flotation produced water treated by the air flotation device into a coagulation reaction device, adding sodium hydroxide and lime into the coagulation reaction device through a coagulation reaction dosing device, and stirring through a stirrer, wherein the coagulation reaction time is 30-60 min;
step C, introducing effluent obtained by the coagulation reaction into a microfiltration membrane filter through a first lift pump, filtering, allowing the obtained produced water to flow into an MCR water production tank, and discharging the obtained solid slag;
d, introducing the produced water obtained by the microfiltration membrane filter into a reverse osmosis device through a second lifting pump and a booster pump in sequence, and introducing the obtained fresh water into a process water production tank;
e, introducing the concentrated water generated by the reverse osmosis device into a nanofiltration device through a third lift pump, and introducing the obtained fresh water into the process water production tank; discharging the obtained concentrated water into a sewage treatment system;
and F, introducing the fresh water in the process water production tank into a beneficiation circulating water collecting pool, wherein the water body in the beneficiation circulating water collecting pool is used for bauxite flotation.
According to the system and the method for recycling the bauxite beneficiation wastewater based on the membrane chemical reactor, the bauxite beneficiation wastewater is treated through the membrane chemical reactor, the quality of produced water is stable, the water inlet requirement of a subsequent reverse osmosis process is met, and process produced water obtained by a reverse osmosis device and a nanofiltration device can be introduced into bauxite beneficiation circulating water to serve bauxite flotation. On one hand, the bauxite flotation circulating water is improved to be continuously utilized, on the other hand, bauxite flotation is served, and the bauxite concentrate yield and the concentrate aluminum-silicon ratio can be improved. Of course, it is not necessary for any product or method of practicing the invention to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
FIG. 1 is a schematic structural diagram of a system for recycling bauxite beneficiation wastewater based on a membrane chemical reactor according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a bauxite beneficiation water recycling system in an embodiment of the present invention.
In the figure, 1, an air flotation device, 101, an air dissolving device, 102, an air flotation dosing device, 2, a membrane chemical reactor, 3, a coagulation reaction device, 301, a coagulation reaction dosing device, 302, a stirrer, 4, a microfiltration membrane filter, 401, a first lifting pump, 402, an MCR water production tank, 403, a constant-pressure backwashing device, 404, a chemical cleaning device, 405, a slag discharge port, 406, a microfiltration membrane component, 407, a water production zone, 408, a filtering zone, 409, a slag storage zone, 410, a water distribution zone, 5, a reverse osmosis device, 501, a second lifting pump, 502, a first safety filter, 503, a booster pump, 6, a concentrated water tank, 7, a nanofiltration device, 701, a third lifting pump, 702, a second safety filter, 8, a process water production tank, 9, a membrane cleaning device, 10, a reverse osmosis-nanofiltration treatment system, 11, a concentrate settling tank, 13, a tailing primary settling tank, 14. the device comprises a tailing secondary settling tank, 15 a bauxite beneficiation circulating water treatment system, 16 a beneficiation circulating water collection tank, 17 a tailing collection device, 18 a concentrate collection device, 19 a flotation dosing device and 20 a settling tank dosing device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a system for recycling bauxite beneficiation wastewater based on a membrane chemical reactor, including:
an air flotation device 1, a Membrane Chemical Reactor (MCR) 2 and a reverse osmosis-nanofiltration treatment system 10.
Wherein, air supporting device 1 includes: the air dissolving device 101 and the air flotation dosing device 102. The air dissolving device 101 is used for introducing air into the air floating device 1; the air-float chemical adding device 102 is used for adding chemicals such as polyaluminium chloride, polypropylene milling amine and the like into the air-float device 1. The air flotation device 1 in the embodiment of the present invention may be an existing air flotation device, and the amount of the chemical agent added may be adjusted according to the actual quality of the bauxite wastewater.
Wherein, the membrane chemical reactor 2 includes: the device comprises a coagulation reaction device 3 and a micro-filtration membrane filter 4, wherein the water outlet end of the coagulation reaction device 3 is connected with the water inlet end of the micro-filtration membrane filter 4 to form a communicating pipeline. And, the water inlet end of the coagulation reaction device 3 is provided with a coagulation reaction dosing device 301.
As a specific implementation manner of the embodiment of the present invention, the coagulation reaction device 3 may further include a stirrer 302, so that the chemical added into the coagulation reaction device 3 can be sufficiently mixed with the water, and the reaction efficiency of the chemical and the water is improved.
Wherein, the microfiltration membrane filter 4 can be an energy-saving immersed filter, comprising: a water production area 407, a filtering area 408, a slag storage area 409, a water distribution area 410 and a constant-pressure backwashing device 403; a first lift pump 401 is also installed on the water inlet pipeline of the microfiltration membrane filter 4.
Wherein, the water producing area 407 is arranged at the upper part of the micro-filtration membrane filter 4, the turbidity of the obtained produced water is less than 0.3NTU, and the hardness is less than 10 mg/L.
The microfiltration membrane component 406 is arranged in the filtering area 408, the microfiltration membrane component 406 is a bag-type, tubular or hollow fiber microfiltration membrane, the aperture of the microfiltration membrane component is 0.1-0.4 μm, and the microfiltration membrane component is usually made of a Polytetrafluoroethylene (PTFE), an ethylene chlorotrifluoroethylene copolymer (ECTFE), a perfluoroethylene propylene copolymer (FEP), a perfluoropropyl perfluorovinyl ether Polytetrafluoroethylene (PFA), a polyvinylidene fluoride (PVDF) or other perfluorinated or high-fluorine polymer material.
Wherein, the slag storage area 409 is arranged at the bottom of the micro-filtration membrane filter 4, suspended matters after the coagulation reaction of the bauxite beneficiation wastewater can be discharged through a slag discharge port 405, and the discharge form is a solid-liquid form with the solid content of more than 10%.
Wherein, the water distribution area 410 is located at the lower part of the micro-filtration membrane filter 4 and is used for water distribution.
The water inlet end of the constant-pressure backwashing device 403 is communicated with the water distribution area 410 of the microfiltration membrane filter 4, and the water outlet end of the constant-pressure backwashing device is communicated with the coagulation reaction device 3, so that the backwashed water body can flow into the coagulation reaction device 3 again for coagulation reaction, the reaction efficiency is improved, and the retention time of the coagulation reaction device 3 is shortened.
Wherein, reverse osmosis-nanofiltration processing system 10 includes: a reverse osmosis device 5 and a nanofiltration device 7; the water inlet end of the reverse osmosis device 5 is connected with the water outlet end of the membrane chemical reactor 2; the concentrated water outlet end of the reverse osmosis device 5 is connected with the water inlet end of the nanofiltration device 7.
As a specific implementation manner of the embodiment of the present invention, the water production outlet end of the reverse osmosis device 5 and the water production outlet end of the nanofiltration device 7 are both connected to a process water production tank 8. The process water production tank 8 is used for storing reverse osmosis water produced by the reverse osmosis device 5 and nanofiltration water produced by the nanofiltration device 7, and the process water can be used as bauxite beneficiation circulating water.
As a specific implementation manner of the embodiment of the present invention, the water inlet ends of the reverse osmosis device 5 and the nanofiltration device 7 are both connected with a membrane cleaning device 9, and the membrane cleaning device 9 is filled with a cleaning agent, so as to clean the reverse osmosis device 5 and the nanofiltration device 7.
As a specific implementation manner of the embodiment of the present invention, a second lift pump 501, a first safety filter 502 and a booster pump 503 are sequentially connected to a pipeline at a water inlet end of the reverse osmosis device 5. Wherein, the lift pump is used for providing power when delivering produced water to the raw water reverse osmosis device 5; the cartridge filter is used for filtering fine substances in a water body, and ensures that the water quality filtering precision and the protective film filtering element are not damaged by large-particle substances; the booster pump is used for further increasing the water pressure when the water is conveyed to the raw water reverse osmosis device 5.
Similarly, a third lift pump 701 and a second security filter 702 are connected to the pipeline at the water inlet end of the nanofiltration device 7 in sequence.
As a specific implementation manner of the embodiment of the present invention, the concentrate water outlet end of the reverse osmosis device 5 is further provided with a concentrate water tank 6 for storing the concentrate water generated by the reverse osmosis device 5. Wherein, the water outlet end of the concentrated water tank 6 is communicated with the third lift pump 701.
As a specific implementation manner of the embodiment of the present invention, as shown in fig. 2, the bauxite beneficiation wastewater recycling system 15 based on the membrane chemical reactor according to the embodiment of the present invention can form a bauxite beneficiation wastewater recycling system together with an existing bauxite beneficiation water circulation system, so that on one hand, raw bauxite circulating water is deeply purified and continuously utilized, and on the other hand, the beneficiation index of bauxite is improved.
The above-mentioned bauxite beneficiation water circulation recycling system, see fig. 2, includes:
the device comprises a flotation device 11, a concentrate settling tank 12, a tailing primary settling tank 13, a tailing secondary settling tank 14, an bauxite beneficiation circulating water treatment system 15, a beneficiation circulating water collecting tank 16, a tailing collecting device 17, a concentrate collecting device 18, a flotation dosing device 19 and a settling tank dosing device 20.
Wherein, the flotation device 11 is communicated with a mineral separation circulating water collecting pool 16, and in addition, the flotation device 11 is communicated with a concentrate settling tank 12 and is also communicated with a tailing primary settling tank 13; the tailing primary settling tank 13 is communicated with a tailing secondary settling tank 14.
Wherein, the water inlet of the bauxite beneficiation wastewater reuse system 15 based on the membrane chemical reactor is communicated with the tailing secondary sedimentation tank 14, specifically, the water inlet of the air flotation device 1 is communicated with the tailing secondary sedimentation tank 14; the water outlet of the bauxite beneficiation wastewater recycling system 15 based on the membrane chemical reactor is communicated with a beneficiation circulating water collecting tank 16, and particularly, the water outlet of a process product water tank 8 is communicated with the beneficiation circulating water collecting tank 16; and the beneficiation circulating water collection tank 16 is also communicated with the flotation device 11.
As can be seen from fig. 2, after the bauxite beneficiation water is contaminated in the bauxite beneficiation water circulation system, the contaminated bauxite beneficiation water is further deeply purified in the bauxite beneficiation wastewater reuse system 15 based on the membrane chemical reactor and is reused in the bauxite beneficiation water circulation system, so that the bauxite beneficiation water can be continuously circulated in the bauxite beneficiation water circulation reuse system.
It should be noted that the flotation device 11, the concentrate settling tank 12, the first-stage tailing settling tank 13, the second-stage tailing settling tank 14, the tailing collecting device 17, the concentrate collecting device 18, the flotation dosing device 19, the settling tank dosing device 20, and the mineral separation circulating water collecting tank 16 are all common devices in an existing bauxite mineral separation water circulating system, and specific structures of the devices are not described again here.
According to the system for recycling the bauxite beneficiation wastewater based on the membrane chemical reactor, the bauxite beneficiation wastewater is treated through the membrane chemical reactor, the quality of produced water is stable, the water inlet requirement of a subsequent reverse osmosis process is met, the process produced water obtained after deep treatment through the reverse osmosis device and the nanofiltration device can be recycled into the bauxite beneficiation circulating water, on one hand, the bauxite beneficiation circulating water is improved to be continuously utilized, on the other hand, bauxite flotation is served, and the bauxite concentrate yield and the concentrate aluminum-silicon ratio can be improved.
The embodiment of the invention provides a method for recycling bauxite beneficiation wastewater, which is applied to a bauxite beneficiation wastewater recycling system based on a membrane chemical reactor shown in figure 1, wherein a water taking point is overflow water of a tailing secondary sedimentation tank, process produced water is recycled to a beneficiation circulating water collecting pool to serve a flotation process, and the method comprises the following steps:
step A, introducing the bauxite beneficiation wastewater into the air flotation device 1 from the tailing secondary sedimentation tank 14, adding polyaluminium chloride and polyacrylamide at different positions of the air flotation device 1 through an air flotation dosing device 102, introducing gas into the air flotation device 1 through an air dissolving device 101, and treating the bauxite beneficiation wastewater. The retention time of the bauxite beneficiation wastewater in the air flotation device 1 is 1-1.5 h.
It should be noted that the addition amounts of the polyaluminum chloride and the polyacrylamide can be flexibly set according to the flocculation amounts of suspended matters and colloids in the bauxite beneficiation wastewater, and the specific addition amounts are not limited herein in the embodiments of the present invention. For example, polyaluminum chloride is added to the air flotation device 1 at 5 to 20% by mass and polyacrylamide is added to the air flotation device 1 at 0.5 to 1.5% by mass, respectively.
And step B, introducing the air flotation water produced after treatment by the air flotation device 1 into a coagulation reaction device 3, adding sodium hydroxide and lime into the coagulation reaction device 3 through a coagulation reaction dosing device 301, and stirring through a stirrer 302 to mix the chemicals with the water body, wherein the coagulation reaction time is 30-60 min. In the coagulation reaction process, part of the collecting agent existing in the tailing overflow water subjected to air floatation treatment is complexed, and simultaneously, the part reacts with a large amount of bicarbonate in the water to generate calcium carbonate precipitate.
Step C, introducing effluent obtained by the coagulation reaction into a microfiltration membrane filter 4, filtering, allowing the obtained produced water to flow into an MCR water production tank 402, and discharging the obtained solid slag; wherein the turbidity of the obtained produced water is less than 0.3 NTU.
And D, introducing the obtained produced water into the reverse osmosis device 5 through the second lifting pump 501 and the booster pump 503 in sequence for advanced treatment, wherein the obtained fresh water can be directly discharged into the beneficiation circulating water collecting tank 16, or can be introduced into the process water producing tank 8 and then introduced into the beneficiation circulating water collecting tank 16.
Step E, introducing the concentrated water generated by the reverse osmosis device 5 into a nanofiltration device 7 through a third lift pump 701, and directly discharging the obtained fresh water into a beneficiation circulating water collecting tank 16, or introducing the fresh water into a process water generating tank 8 and then introducing the fresh water into the beneficiation circulating water collecting tank 16; discharging the obtained concentrated water into a sewage treatment system;
and F, introducing the fresh water in the process water production tank 8 into a beneficiation circulating water collecting pool 16, wherein the water body in the beneficiation circulating water collecting pool 16 is used for bauxite flotation.
In the embodiment of the invention, the nanofiltration is selected to treat the reverse osmosis concentrated water, so that the amount of the discharged water is reduced, and the return water utilization rate of the whole treatment system is improved.
As an optional implementation manner of the embodiment of the present invention, the microfiltration membrane filter 4 specifically comprises the following steps:
liquid feeding: introducing effluent obtained by the coagulation reaction into a microfiltration membrane filter 4;
and (3) filtering: the water body is filtered by a microfiltration membrane component 406 in the microfiltration membrane filter 4;
back flushing: the constant pressure backwashing device 403 of the microfiltration membrane filter 4 is started, and the produced water in the water production area 407 flows out from the interior of the microfiltration membrane component 406 to the exterior, so as to perform backwashing on the microfiltration membrane component 406; the constant-pressure backwashing device 403 does not need additional energy consumption;
deslagging: the filter cake or reaction suspended substance deposited in the slag storage area 409 is discharged through a slag discharge port 405 in a solid-liquid mode with the solid content of more than 10%.
According to the recycling method of the bauxite beneficiation wastewater provided by the embodiment of the invention, the bauxite beneficiation wastewater is filtered through the membrane chemical reactor, the quality of produced water is stable, the water inlet requirement of a subsequent reverse osmosis process is met, and the process produced water obtained through the reverse osmosis device and the nanofiltration device can be recycled into the bauxite beneficiation circulating water, so that the recycling rate of the bauxite beneficiation wastewater is improved, and the beneficiation index of bauxite can be improved.
In a certain bauxite beneficiation enterprise, the bauxite beneficiation circulating water index is as follows: pH: 8.7 ~ 9.1, TDS: 4 to 5 x 103mg/L, chemical oxygen demand: 330-740 mg/L, bicarbonate alkalinity: 23-25 mmol/L.
After the bauxite beneficiation wastewater recycling system based on the membrane chemical reactor is used for treating, the water quality is obviously improved, and the process water quality indexes of all sections are shown in the table 1:
TABLE 1 indexes and treatment results of various pollutants in industrial mineral processing wastewater of a certain bauxite mineral processing industry
It should be noted that, in the system for recycling bauxite beneficiation wastewater based on a membrane chemical reactor of the present invention, fluid, such as liquid, e.g. wastewater, fresh water, various concentrated liquids, etc., or solid, e.g. sediment, various chemicals, etc., is transported between the parts of the apparatus, and unless otherwise stated, the fluid can be transported through pipelines in general; in addition, when extra power transmission is needed in the conveying process, appropriate power equipment such as a pump and a fan can be additionally arranged on a needed pipeline. Further, it is also possible to add a suitable valve to the piping to control the flow direction of the fluid, etc., when necessary.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (7)
1. The utility model provides a bauxite beneficiation wastewater recycling system based on membrane chemical reactor which characterized in that includes:
the device comprises an air floatation device (1), a membrane chemical reactor (2) and a reverse osmosis-nanofiltration treatment system (10);
the air flotation device (1) comprises: an air dissolving device (101) and an air floating dosing device (102);
the membrane chemical reactor (2) comprises: a coagulation reaction device (3) and a microfiltration membrane filter (4); the water outlet end of the coagulation reaction device (3) is connected with the water inlet end of the microfiltration membrane filter (4); a coagulation reaction dosing device (301) is arranged at the water inlet end of the coagulation reaction device (3);
the microfiltration membrane filter (4) comprises: a water production area (407), a filtering area (408), a water distribution area (410), a slag storage area (409) and a constant-pressure backwashing device (403); a microfiltration membrane component (406) is arranged in the filtering area (408); a first lifting pump (401) is arranged on a water inlet pipeline of the micro-filtration membrane filter (4);
the reverse osmosis-nanofiltration treatment system (10) comprises: a reverse osmosis device (5) and a nanofiltration device (7); the water inlet end of the reverse osmosis device (5) is connected with the water outlet end of the membrane chemical reactor (2); the concentrated water outlet end of the reverse osmosis device (5) is connected with the water inlet end of the nanofiltration device (7).
2. The membrane chemical reactor-based bauxite beneficiation wastewater reuse system according to claim 1, wherein the water production area (407) is disposed at an upper portion of the microfiltration membrane filter (4); the slag storage area (409) is arranged at the bottom of the microfiltration membrane filter (4).
3. The membrane chemical reactor-based bauxite beneficiation wastewater reuse system according to claim 1, wherein the microfiltration membrane filter (4) is an immersion filter; the aperture of the microfiltration membrane component (406) is 0.1-0.4 mu m; the microfiltration membrane component (406) adopts a tube bag type, a tube type or a hollow fiber microfiltration membrane; the microfiltration membrane module (406) is made of the following materials: at least one of polytetrafluoroethylene, ethylene chlorotrifluoroethylene copolymer, perfluoroethylene propylene copolymer, perfluoropropyl perfluorovinyl ether polytetrafluoroethylene copolymer, and polyvinylidene fluoride.
4. The system for recycling the bauxite beneficiation wastewater based on a membrane chemical reactor, according to the claim 1, wherein a stirrer (302) is further arranged in the coagulation reaction device (3).
5. The system for recycling the bauxite beneficiation wastewater based on the membrane chemical reactor, according to claim 1, wherein a process water production tank (8) is connected to both a water production outlet end of the reverse osmosis device (5) and a fresh water outlet end of the nanofiltration device (7).
6. The system for recycling the bauxite beneficiation wastewater based on the membrane chemical reactor, according to claim 1, wherein a second lift pump (501), a first safety filter (502) and a booster pump (503) are connected to a pipeline at a water inlet end of the reverse osmosis device (5) in sequence; a third lifting pump (701) and a second security filter (702) are sequentially connected to a pipeline at the water inlet end of the nanofiltration device (7); and a concentrated water tank (6) is further installed at the concentrated water outlet end of the reverse osmosis device (5), and the water outlet end of the concentrated water tank (6) is communicated with the third lifting pump (701).
7. A recycling method of bauxite beneficiation wastewater, which is applied to the bauxite beneficiation wastewater recycling system based on a membrane chemical reactor according to claims 1 to 6, and which comprises the following steps:
step A, introducing the bauxite beneficiation wastewater into an air flotation device (1), adding polyaluminum chloride and polyacrylamide into the air flotation device (1) through an air flotation dosing device (102), introducing gas into the air flotation device (1) through a gas dissolving device (101), and treating the bauxite beneficiation wastewater;
b, introducing the air flotation produced water treated by the air flotation device (1) into a coagulation reaction device (3), adding sodium hydroxide and lime into the coagulation reaction device (3) through a coagulation reaction dosing device (301), and stirring through a stirrer (302), wherein the coagulation reaction time is 30-60 min;
step C, introducing effluent obtained by the coagulation reaction into a microfiltration membrane filter (4) through a first lift pump (401), filtering, allowing the obtained produced water to flow into an MCR (micro-filtration reactor) water production tank (402), and discharging the obtained solid slag;
d, introducing the produced water obtained by the microfiltration membrane filter (4) into a reverse osmosis device (5) through a second lifting pump (501) and a booster pump (503) in sequence, and introducing the obtained fresh water into a process water production tank (8);
e, introducing the concentrated water generated by the reverse osmosis device (5) into a nanofiltration device (7) through a third lifting pump (701), and introducing the obtained fresh water into the process water production tank (8); discharging the obtained concentrated water into a sewage treatment system;
and F, introducing the fresh water in the process water production tank (8) into a beneficiation circulating water collecting pool, wherein the water body in the beneficiation circulating water collecting pool is used for bauxite flotation.
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