CN113198324A

CN113198324A - Nanofiltration device and method for advanced purification treatment of uranium-containing wastewater from uranium purification and conversion

Info

Publication number: CN113198324A
Application number: CN202110494666.7A
Authority: CN
Inventors: 纪泽雨; 耿龙; 马治军; 李天福; 李英锋; 周天华; 张龙; 王军; 田慎良; 杨丰金
Original assignee: 404 Co Ltd China National Nuclear Corp
Current assignee: 404 Co Ltd China National Nuclear Corp
Priority date: 2021-05-07
Filing date: 2021-05-07
Publication date: 2021-08-03

Abstract

A nanofiltration device for advanced purification treatment of uranium-bearing wastewater through uranium purification and conversion belongs to the field of wastewater purification treatment and recovery. The invention solves the problems that the prior uranium-bearing wastewater treatment method has high uranium content, exceeds the maximum allowable limit value of industrial wastewater discharge and has higher operation cost after the uranium-bearing wastewater is treated. The device comprises a multi-stage treatment mechanism, wherein the multi-stage treatment mechanism is arranged in series, each stage treatment mechanism comprises a nanofiltration raw water tank and a nanofiltration membrane group, the nanofiltration raw water tank is connected with the nanofiltration membrane group through a pipeline, a clear liquid port of each stage nanofiltration membrane group is sequentially connected with a lower stage nanofiltration raw water tank through a pipeline, and concentrated liquid ports of the secondary nanofiltration membrane group and the nanofiltration membrane group below the secondary nanofiltration membrane group are connected with a first stage nanofiltration raw water tank through a pipeline. The purification treatment nanofiltration device provided by the invention can realize that the uranium content of the wastewater subjected to the advanced purification treatment of the uranium-containing wastewater meets the wastewater discharge standard, and has the characteristics of cleanness, environmental protection, energy conservation and no introduction of secondary waste.

Description

Nanofiltration device and method for advanced purification treatment of uranium-containing wastewater from uranium purification and conversion

Technical Field

The invention relates to a uranium-bearing wastewater purification treatment recovery device, and belongs to the field of wastewater purification treatment.

Background

At present, the treatment measures of the uranium-containing waste liquid generated by the domestic uranium purification and conversion production line are mainly an ion exchange method and a chemical precipitation method. Firstly, adding Na into the waste liquid₂CO₃After the solution was made alkaline, uranium was adsorbed by a 201 × 7 type ion exchange resin. After the resin adsorbs the saturation, through desorption, the transformation to the resin, realize the reuse of resin, the high concentration uranium-bearing waste liquid that forms carries out chemical precipitation again, turns into sodium diuranate or ammonium diuranate with the uranium ion, realizes the recycle of uranium. The prior method for treating the uranium-bearing wastewater has the following defects:

1. the uranium wastewater treatment by the ion exchange method is influenced by the self-adsorption performance of the resin, the uranium content of the waste liquid can be reduced to 0.5-2 mg/L and exceeds the maximum allowable limit value of the discharge amount of the industrial wastewater by 0.05mg/L, and the method uses more chemical agents, so that the salt content of the discharge liquid is higher, and the operation cost is improved;

2. the recycling of uranium is realized after the chemical precipitation is carried out on uranium wastewater through the existing method, and in the recycling process of metal uranium, because the concentration of uranium waste liquid after ion exchange is low, more nuclear materials are lost in the recycling process of metal uranium.

In summary, a uranium-bearing wastewater purification treatment device with low uranium content and low operation cost for the discharge liquid after uranium-bearing wastewater purification treatment is needed to solve the above problems.

Disclosure of Invention

The invention solves the problems that the prior uranium-bearing wastewater treatment method has high uranium content, exceeds the maximum allowable limit value of industrial wastewater discharge and has higher operation cost after the uranium-bearing wastewater is treated, and further discloses a nanofiltration device and a nanofiltration method for the advanced purification treatment of uranium-bearing wastewater through purification and conversion of uranium. The following presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. It should be understood that this summary is not an exhaustive overview of the invention. It is not intended to determine the key or critical elements of the present invention, nor is it intended to limit the scope of the present invention.

The technical scheme of the invention is as follows:

the utility model provides a receive filter equipment that is used for uranium purification conversion uranium-bearing waste water deep purification to handle, includes multistage processing mechanism, and multistage processing mechanism establishes ties and sets up, and every stage processing mechanism is including receiving the former water pitcher of straining and receiving the filter membrane group, receives and strains former water pitcher and receive the filter membrane group and pass through the tube coupling, and the clear liquid mouth of every level of filter membrane group of straining passes through the tube coupling with the former water pitcher of straining of subordinate in proper order, and the thick liquid mouth of the filter membrane group of straining below secondary and secondary passes through the pipeline and is connected with the former water pitcher of straining of first level.

Further, the multistage treatment mechanism comprises a first-stage treatment mechanism, a second-stage treatment mechanism and a third-stage treatment mechanism, the first-stage treatment mechanism, the second-stage treatment mechanism and the third-stage treatment mechanism are sequentially connected through a pipeline, the first-stage treatment mechanism comprises a first nanofiltration raw water tank and a first nanofiltration membrane group, the second-stage treatment mechanism comprises a second nanofiltration raw water tank and a second nanofiltration membrane group, the third-stage treatment mechanism comprises a third nanofiltration raw water tank and a third nanofiltration membrane group, the first nanofiltration raw water tank is connected with the first nanofiltration membrane group through a pipeline, a clear liquid port of the first nanofiltration membrane group is connected with the second nanofiltration raw water tank through a pipeline, the second nanofiltration raw water tank is connected with the second nanofiltration membrane group through a pipeline, a clear liquid port of the second nanofiltration membrane group is connected with the third nanofiltration raw water tank through a pipeline, a clear liquid port of the third nanofiltration membrane group is connected with a discharge pipe, the concentrated liquid ports of the second nanofiltration membrane group and the third nanofiltration membrane group are connected with the first nanofiltration raw water tank through a pipeline.

Further, still including wasing water tank and washing water pump, the exit end of wasing the water tank is installed and is washd the water pump, washs the water tank and is connected with the dense liquid mouth of first nanofiltration membrane group, second nanofiltration membrane group and third nanofiltration membrane group through many pipelines respectively.

Furthermore, a first feeding pump is installed between the first nanofiltration raw water tank and the first nanofiltration membrane group, a second feeding pump is installed between the second nanofiltration raw water tank and the second nanofiltration membrane group, and a third feeding pump is installed between the third nanofiltration raw water tank and the third nanofiltration membrane group.

Furthermore, the molecular weight cut-off of the first nanofiltration membrane group is 300 daltons, and the molecular weight cut-off of the second nanofiltration membrane group and the third nanofiltration membrane group is 150 daltons.

Furthermore, the first nanofiltration raw water tank, the second nanofiltration raw water tank and the third nanofiltration raw water tank are all made of PE materials or glass steel materials, and the nanofiltration membranes of the first nanofiltration membrane group, the second nanofiltration membrane group and the third nanofiltration membrane group are all polyamide tubular composite membranes.

Furthermore, the first feeding pump, the second feeding pump and the third feeding pump are all made of S316L stainless steel or tetrafluoroethylene-lined material.

A treatment method implemented by a nanofiltration device for advanced purification treatment of uranium-containing wastewater from purification and conversion of uranium comprises the following steps:

the method comprises the following steps: inputting the uranium-containing wastewater to be treated after purification and conversion into a first nanofiltration raw water tank of a primary treatment mechanism, and enabling the uranium-containing wastewater to be treated after purification and conversion to flow into a first nanofiltration membrane group through a pipeline to realize primary purification treatment;

step two: the uranium-containing wastewater clear solution after the primary purification treatment flows into a second nanofiltration raw water tank of a secondary treatment mechanism through a clear solution port of the first nanofiltration membrane group, and the uranium-containing wastewater flows into the second nanofiltration membrane group through a pipeline to realize secondary purification treatment;

step three: the uranium-containing wastewater clear solution after the secondary purification treatment flows into a third nanofiltration raw water tank of a tertiary treatment mechanism through a clear solution port of a second nanofiltration membrane group, and the uranium-containing wastewater flows into the third nanofiltration membrane group through a pipeline to realize the tertiary purification treatment;

step four: the uranium content of the clear solution of the uranium-containing wastewater after the three-stage purification treatment is less than 0.05mg/L, the clear solution reaches the discharge standard, and the clear solution is discharged through a clear solution port of a third nanofiltration membrane group;

step six: and (4) enabling the uranium-containing wastewater concentrated solution after the second-stage purification treatment and the third-stage purification treatment to flow back to a first nanofiltration raw water tank of the first-stage treatment mechanism through a pipeline, and repeatedly performing the step one.

The utility model provides a nanofiltration device for uranium purification conversion uranium-bearing waste water deep purification handles, includes first grade processing mechanism, concentrated solution jar and concentrated solution pump, and concentrated solution processing mechanism establishes ties with first grade processing mechanism, and concentrated solution processing mechanism is connected with the concentrated solution jar, and the concentrated solution pump is installed to the flowing back end of concentrated solution jar.

Further, the first-stage treatment mechanism comprises a first nanofiltration raw water tank and a first nanofiltration membrane group, the first nanofiltration raw water tank is connected with the first nanofiltration membrane group through a pipeline, the concentrated solution treatment mechanism comprises a fourth nanofiltration raw water tank and a fourth nanofiltration membrane group, the fourth nanofiltration raw water tank is connected with a concentrated solution port of the first nanofiltration membrane group through a pipeline, the fourth nanofiltration raw water tank is connected with the fourth nanofiltration membrane group through a pipeline, the concentrated solution port of the fourth nanofiltration membrane group is connected with the concentrated solution tank through a pipeline, and a clear solution port of the fourth nanofiltration membrane group is connected with the first nanofiltration raw water tank through a pipeline.

Further, still including wasing water tank and washing water pump, the exit end of wasing the water tank is installed and is washd the water pump, washs the water tank and is connected with the dense liquid mouth of first nanofiltration membrane group and fourth nanofiltration membrane group through many pipelines respectively.

Furthermore, a first feeding pump is arranged between the first nanofiltration raw water tank and the first nanofiltration membrane group, and a fourth feeding pump is arranged between the fourth nanofiltration raw water tank and the fourth nanofiltration membrane group.

Furthermore, the molecular weight cut-off of the first nanofiltration membrane group is 300 daltons, and the molecular weight cut-off of the fourth nanofiltration membrane group is 150 daltons.

Furthermore, the first nanofiltration raw water tank and the fourth nanofiltration raw water tank are both made of PE materials or glass steel materials, and the nanofiltration membranes of the first nanofiltration membrane group and the fourth nanofiltration membrane group are both polyamide tubular composite membranes.

Furthermore, the first feeding pump, the fourth feeding pump and the concentrated solution pump are all made of S316L stainless steel or tetrafluoroethylene-lined material.

step two: enabling the uranium-containing wastewater concentrated solution subjected to primary purification treatment to flow into a fourth nanofiltration raw water tank of a concentrated solution treatment mechanism through a concentrated solution port of the first nanofiltration membrane group, enabling the uranium-containing wastewater concentrated solution to flow into the fourth nanofiltration membrane group through a pipeline for volume reduction compression, enabling the uranium-containing wastewater concentrated solution subjected to volume reduction compression to flow into a concentrated solution tank through a concentrated solution port of the fourth nanofiltration membrane group, opening a concentrated solution pump to discharge high-concentration uranium-containing wastewater in the concentrated solution tank, performing ammonium salt precipitation, and recycling metallic uranium;

step three: and (4) enabling the uranium-containing wastewater clear liquid subjected to volume reduction and compression by the fourth nanofiltration membrane group to flow back to the first nanofiltration raw water tank through a clear liquid port of the fourth nanofiltration membrane group, and repeating the step one.

The utility model provides a receive filter equipment that is used for uranium purification conversion uranium-bearing waste water deep purification to handle, including first grade processing mechanism, multistage processing mechanism and concentrated solution processing mechanism, multistage processing mechanism establishes ties and sets up, every stage processing mechanism is including receiving the former water pitcher of straining and receiving the filter membrane group, receive and strain former water pitcher and receive the filter membrane group and pass through the tube coupling, the clear liquid mouth of every grade of receiving the filter membrane group in proper order with the former water pitcher of subordinate receiving the filter and pass through the tube coupling, the concentrate mouth of the filter membrane group below secondary and secondary is passed through the pipeline and is received the former water pitcher with first grade and be connected, first grade processing mechanism and concentrated solution processing mechanism establish ties and set up, secondary and the processing mechanism below the secondary and concentrated solution processing mechanism parallel arrangement.

Further, the device also comprises a concentrated solution tank and a concentrated solution pump, wherein the concentrated solution processing mechanism is connected with the concentrated solution tank, and concentrated solution is installed at the liquid discharge end of the concentrated solution tank.

Further, the multistage treatment mechanism comprises a first-stage treatment mechanism, a second-stage treatment mechanism and a third-stage treatment mechanism, the first-stage treatment mechanism, the second-stage treatment mechanism and the third-stage treatment mechanism are sequentially connected through a pipeline, the first-stage treatment mechanism comprises a first nanofiltration raw water tank and a first nanofiltration membrane group, the second-stage treatment mechanism comprises a second nanofiltration raw water tank and a second nanofiltration membrane group, the third-stage treatment mechanism comprises a third nanofiltration raw water tank and a third nanofiltration membrane group, the first nanofiltration raw water tank is connected with the first nanofiltration membrane group through a pipeline, a clear liquid port of the first nanofiltration membrane group is connected with the second nanofiltration raw water tank through a pipeline, the second nanofiltration raw water tank is connected with the second nanofiltration membrane group through a pipeline, a clear liquid port of the second nanofiltration membrane group is connected with the third nanofiltration raw water tank through a pipeline, a clear liquid port of the third nanofiltration membrane group is connected with a discharge pipe, the concentrated solution port of the second nanofiltration membrane group and the concentrated solution port of the third nanofiltration membrane group are connected with the first nanofiltration raw water tank through a pipeline, the concentrated solution treatment mechanism comprises a fourth nanofiltration raw water tank and a fourth nanofiltration membrane group, the fourth nanofiltration raw water tank is connected with the concentrated solution port of the first nanofiltration membrane group through a pipeline, the fourth nanofiltration raw water tank is connected with the fourth nanofiltration membrane group through a pipeline, the clear solution port of the fourth nanofiltration membrane group is connected with the first nanofiltration raw water tank through a pipeline, and the concentrated solution port of the fourth nanofiltration membrane group is connected with the concentrated solution tank through a pipeline.

Further, still including wasing water tank and washing water pump, the exit end of wasing the water tank is installed and is washd the water pump, washs the water tank and is connected with the dense liquid mouth of first nanofiltration membrane group, second nanofiltration membrane group, third nanofiltration membrane group and fourth nanofiltration membrane group through many pipelines respectively.

Further, a first feeding pump is installed between the first nanofiltration raw water tank and the first nanofiltration membrane group, a second feeding pump is installed between the second nanofiltration raw water tank and the second nanofiltration membrane group, a third feeding pump is installed between the third nanofiltration raw water tank and the third nanofiltration membrane group, and a fourth feeding pump is installed between the fourth nanofiltration raw water tank and the fourth nanofiltration membrane group.

Furthermore, the molecular weight cut-off of the first nanofiltration membrane group is 300 daltons, and the molecular weight cut-off of the second nanofiltration membrane group, the third nanofiltration membrane group and the fourth nanofiltration membrane group is 150 daltons.

Furthermore, the first nanofiltration raw water tank, the second nanofiltration raw water tank, the third nanofiltration raw water tank and the fourth nanofiltration raw water tank are all made of PE materials or glass steel materials, and nanofiltration membranes of the first nanofiltration membrane group, the second nanofiltration membrane group, the third nanofiltration membrane group and the fourth nanofiltration membrane group are all polyamide tubular composite membranes.

Furthermore, the first feeding pump, the second feeding pump, the third feeding pump, the fourth feeding pump and the concentrated solution pump are all made of S316L stainless steel or tetrafluoroethylene lining.

step two: the uranium-containing wastewater clear solution after primary purification treatment flows into a second raw nanofiltration water tank of a secondary treatment mechanism through a clear solution port of a first nanofiltration membrane group, the uranium-containing wastewater flows into the second nanofiltration membrane group through a pipeline to realize secondary purification treatment, the uranium-containing wastewater concentrated solution after primary purification treatment flows into a fourth raw nanofiltration water tank of a concentrated solution treatment mechanism through a concentrated solution port of the first nanofiltration membrane group, the uranium-containing wastewater concentrated solution flows into the fourth nanofiltration water tank through a pipeline to be subjected to volume reduction compression, the uranium-containing wastewater concentrated solution after volume reduction compression flows into a concentrated solution tank through a concentrated solution port of the fourth nanofiltration membrane group, a concentrated solution pump is opened to discharge high-concentration uranium-containing wastewater in the concentrated solution tank, ammonium salt precipitation is carried out, and uranium is recovered;

step five: and (3) enabling the uranium-containing wastewater concentrated solution after the second-stage purification treatment and the third-stage purification treatment to flow back into the first nanofiltration raw water tank of the first-stage treatment mechanism through a pipeline, enabling the uranium-containing wastewater clear solution after the volume reduction and compression of the fourth nanofiltration membrane group to flow back into the first nanofiltration raw water tank through a clear solution port of the fourth nanofiltration membrane group, and repeatedly performing the step one.

The invention has the beneficial effects that:

1. the nanofiltration device and the method for deeply purifying uranium-containing wastewater can realize the deep purification treatment of uranium-containing wastewater, the uranium content of clear liquid treated by the device can be reduced to 0.05mg/L, and the national emission standard is reached, the nanofiltration device for purifying uranium-containing wastewater is a pressure-driven membrane separation technology between reverse osmosis and ultrafiltration, is physical filtration, and has the characteristics of cleanness, environmental protection, energy conservation, no introduction of secondary waste, relative simplicity in operation and maintenance and obvious economic benefit compared with the traditional ion exchange method, precipitation method and adsorption method;

2. the nanofiltration device and the method for the deep purification treatment of the uranium-containing wastewater through uranium purification and conversion can realize volume reduction and concentration of the uranium-containing wastewater through uranium purification and conversion, and the nanofiltration concentrated solution can be directly subjected to ammonium salt precipitation, so that metal uranium is recycled, and the loss of nuclear materials is reduced.

3. The nanofiltration device for the advanced purification treatment and recovery of uranium-containing wastewater from uranium purification and conversion can simultaneously carry out advanced purification on uranium-containing wastewater and recover uranium metal in the uranium-containing wastewater, the uranium-containing wastewater after the advanced purification treatment meets the wastewater discharge standard, and uranium metal is recovered from uranium-containing wastewater concentrated solution, so that the nanofiltration device has remarkable economic benefit.

Drawings

FIG. 1 is a flow chart of a nanofiltration device and a method for advanced purification treatment of uranium-containing wastewater from uranium purification and conversion;

FIG. 2 is a flow diagram of a nanofiltration device and a method for advanced purification treatment of uranium-containing wastewater from uranium purification and conversion;

fig. 3 is a schematic diagram of a nanofiltration device and a method for advanced purification treatment of uranium-containing wastewater from uranium purification and conversion.

In the figure, 1-a first nanofiltration raw water tank, 2-a first feed pump, 3-a first nanofiltration membrane group, 4-a second nanofiltration raw water tank, 5-a second feed pump, 6-a second nanofiltration membrane group, 7-a third nanofiltration raw water tank, 8-a third feed pump, 9-a third nanofiltration membrane group, 10-a fourth nanofiltration raw water tank, 11-a fourth feed pump, 12-a fourth nanofiltration membrane group, 13-a concentrated solution tank, 14-a concentrated solution pump, 15-a cleaning water tank, 16-a cleaning water pump, 17-a first-stage treatment mechanism, 18-a second-stage treatment mechanism, 19-a third-stage treatment mechanism and 20-a concentrated solution treatment mechanism.

Detailed Description

In order that the objects, aspects and advantages of the invention will become more apparent, the invention will be described by way of example only, and in connection with the accompanying drawings. It should be understood that the description is intended to be exemplary, and not intended to limit the scope of the invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

The first embodiment is as follows: the embodiment is described with reference to fig. 3, a nanofiltration device for advanced purification treatment of uranium-purifying and converting uranium-containing wastewater of the embodiment includes a multi-stage treatment mechanism, the multi-stage treatment mechanism is arranged in series, each stage treatment mechanism includes a nanofiltration raw water tank and a nanofiltration membrane group, the nanofiltration raw water tank is connected with the nanofiltration membrane group through a pipeline, a clear liquid port of each stage of nanofiltration membrane group is sequentially connected with a lower stage nanofiltration raw water tank through a pipeline, concentrated liquid ports of the nanofiltration membrane groups below the secondary and the secondary are connected with a first stage nanofiltration raw water tank through a pipeline, uranium content of the uranium-containing wastewater after advanced purification treatment by the multi-stage treatment mechanism is lower than 0.05mg/L, and the wastewater can be discharged after reaching a wastewater discharge standard.

The second embodiment is as follows: the present embodiment is described with reference to fig. 3, the multi-stage treatment mechanism includes a first stage treatment mechanism 17, a second stage treatment mechanism 18 and a third stage treatment mechanism 19, the first stage treatment mechanism 17, the second stage treatment mechanism 18 and the third stage treatment mechanism 19 are sequentially connected by a pipeline, the first stage treatment mechanism 17 includes a first nanofiltration raw water tank 1 and a first nanofiltration membrane group 3, the second stage treatment mechanism 18 includes a second nanofiltration raw water tank 4 and a second nanofiltration membrane group 6, the third stage treatment mechanism 19 includes a third nanofiltration raw water tank 7 and a third nanofiltration membrane group 9, the first nanofiltration raw water tank 1 is connected with the first nanofiltration membrane group 3 by a pipeline, a clear liquid port of the first nanofiltration membrane group 3 is connected with the second raw water tank 4 by a pipeline, the second nanofiltration raw water tank 4 is connected with the second nanofiltration membrane group 6 by a pipeline, a clear liquid port of the second nanofiltration membrane group 6 is connected with a third nanofiltration raw water tank 7 through a pipeline, the third nanofiltration raw water tank 7 is connected with a third nanofiltration membrane group 9 through a pipeline, a clear liquid port of the third nanofiltration membrane group 9 is connected with a discharge pipe, concentrated liquid ports of the second nanofiltration membrane group 6 and the third nanofiltration membrane group 9 are connected with a first nanofiltration raw water tank 1 through a pipeline, uranium-containing wastewater to be treated and converted is firstly discharged into the first nanofiltration raw water tank 1 of the primary treatment mechanism 17 and then flows into the first nanofiltration membrane group 3 through a pipeline for primary purification treatment, uranium-containing wastewater clear liquid after primary purification treatment flows into a second nanofiltration raw water tank 4 of the secondary treatment mechanism 18 through a pipeline, and then flows into the second nanofiltration membrane group 6 through a pipeline for secondary purification treatment, uranium-containing wastewater clear liquid after secondary purification treatment flows into the third nanofiltration raw water tank 7 of the tertiary treatment structure 19 through a pipeline, the uranium waste water clear liquid flows into the third nanofiltration membrane group 9 through the pipeline to be subjected to three-stage purification treatment, the uranium content of the uranium waste water clear liquid after the three-stage purification treatment is lower than 0.05mg/L, the discharged waste water standard is reached, the uranium waste water clear liquid is discharged through the pipeline, and the uranium waste water concentrated solution after the purification treatment of the second nanofiltration membrane group 6 and the third nanofiltration membrane group 9 flows back into the first nanofiltration raw water tank 1 through the pipeline to be subjected to purification treatment.

The third concrete implementation mode: the embodiment is described by combining fig. 1-fig. 3, the nanofiltration device for advanced purification treatment of uranium purification conversion uranium-containing wastewater further comprises a cleaning water tank 15 and a cleaning water pump 16, the cleaning water pump 16 is installed at the outlet end of the cleaning water tank 15, the cleaning water tank 15 is respectively connected with the concentrate ports of the first nanofiltration membrane group 3, the second nanofiltration membrane group 6 and the third nanofiltration membrane group 9 through a plurality of pipelines, an independent cleaning water tank 15 is designed, when the three groups of nanofiltration membrane groups are used for a long time, the purification treatment effect of the nanofiltration membrane groups is weakened, cleaning water is introduced from the concentrate ports of the nanofiltration membrane groups through the cleaning water tank 15 and is discharged from the concentrate ports, the surface of the nanofiltration membranes of the nanofiltration membrane groups is cleaned, and the purification treatment effect of the nanofiltration membrane groups is improved.

The fourth concrete implementation mode: the present embodiment is described with reference to fig. 1 to fig. 3, and a nanofiltration device for advanced purification treatment of uranium purification conversion uranium-containing wastewater of the present embodiment is provided, wherein a first feed pump 2 is installed between a first nanofiltration raw water tank 1 and a first nanofiltration membrane group 3, a second feed pump 5 is installed between a second nanofiltration raw water tank 4 and a second nanofiltration membrane group 6, a third feed pump 8 is installed between a third nanofiltration raw water tank 7 and a third nanofiltration membrane group 9, and the feed pump is used for providing power for uranium wastewater input to each stage of nanofiltration membrane group.

The fifth concrete implementation mode: the embodiment is described with reference to fig. 1 to fig. 3, and the nanofiltration device for advanced purification treatment of uranium-purified and converted uranium-containing wastewater of the embodiment has a molecular weight cutoff of 300 daltons for the first nanofiltration membrane group 3, a molecular weight cutoff of 150 daltons for the second nanofiltration membrane group 3 and the third nanofiltration membrane group 9, wherein the first nanofiltration raw water tank 1, the second nanofiltration raw water tank 4 and the third nanofiltration raw water tank 7 are all made of PE material or glass steel material, the nanofiltration membranes of the first nanofiltration membrane group 3, the second nanofiltration membrane group 6 and the third nanofiltration membrane group 9 are all polyamide tubular composite membranes, the first feed pump 2, the second feed pump 5 and the third feed pump 8 are all made of S316L stainless steel material or tetrafluoroethylene lining, and as the pipeline, pipe fitting, equipment and instrument overflowing parts in contact with wastewater all need to resist corrosion of hydrofluoric acid, nitric acid and alkali, therefore, the overflowing parts of all the pipe fittings and the feed pump are made of S316L stainless steel or tetrafluoroethylene lining, each nanofiltration raw water tank is made of PE or glass fiber reinforced plastic, the nanofiltration membrane in the nanofiltration device is made of a polyamide tubular composite membrane, a water inlet of each nanofiltration membrane group is provided with a temperature detection device, the nanofiltration membrane group stops running and gives an alarm when the temperature of the device is too high, and the safety of the uranium wastewater deep purification treatment is improved.

The sixth specific implementation mode: the treatment method implemented by the nanofiltration device for the deep purification treatment of the uranium-purification conversion uranium-bearing wastewater according to the embodiment is described by combining with figures 1 to 3, and comprises the following steps,

the method comprises the following steps: inputting the uranium-containing wastewater to be treated, which is purified and converted, into a first nanofiltration raw water tank 1 of a primary treatment mechanism 17, and enabling the uranium-containing wastewater to be treated, which is purified and converted, to flow into a first nanofiltration membrane group 3 through a pipeline to realize primary purification treatment;

step two: the uranium-bearing wastewater clear solution after the primary purification treatment flows into a second nanofiltration raw water tank 4 of a secondary treatment mechanism 18 through a clear solution port of a first nanofiltration membrane group 3, and the uranium-bearing wastewater flows into a second nanofiltration membrane group 6 through a pipeline to realize secondary purification treatment;

step three: the uranium-bearing wastewater clear solution after the secondary purification treatment flows into a third nanofiltration raw water tank 7 of a tertiary treatment mechanism 19 through a clear solution port of a second nanofiltration membrane group 6, and the uranium-bearing wastewater flows into a third nanofiltration membrane group 9 through a pipeline to realize the tertiary purification treatment;

step four: the uranium content of the clear solution of the uranium-containing wastewater after the three-stage purification treatment is less than 0.05mg/L, the clear solution reaches the discharge standard, and the clear solution is discharged through a clear solution port of a third nanofiltration membrane group 9;

step six: and (3) enabling the uranium-containing wastewater concentrated solution after the second-stage purification treatment and the third-stage purification treatment to flow back into the first nanofiltration raw water tank 1 of the first-stage treatment mechanism 17 through a pipeline, and repeating the step one.

The seventh embodiment: the embodiment is described with reference to fig. 1-3, a nanofiltration device for advanced purification treatment of uranium-bearing wastewater from uranium purification and conversion comprises a primary treatment mechanism 17, at least one primary concentrated solution treatment mechanism 20, a concentrated solution tank 13 and a concentrated solution pump 14, wherein the concentrated solution treatment mechanism 20 is connected in series with the primary treatment mechanism 17, the concentrated solution treatment mechanism 20 is connected with the concentrated solution tank 13, the concentrated solution pump 14 is installed at the drainage end of the concentrated solution tank 13, concentrated solution generated when the primary treatment mechanism 17 treats wastewater flows into the concentrated solution treatment mechanism 20 through a pipeline for volume reduction and concentration, the concentrated uranium-bearing wastewater after volume reduction and concentration flows into the concentrated solution tank 13, clear solution flows back into the first nanofiltration raw water tank 1 of the primary treatment mechanism 17 for lower-stage filtration, high-concentration uranium-bearing wastewater in the concentrated solution tank 13 is discharged through a pipeline, the concentrated solution pump 14 provides power for the high-concentration uranium-bearing wastewater, the discharged high-concentration uranium-bearing wastewater can be directly subjected to ammonium salt precipitation, and the metal uranium is recycled, so that the loss of nuclear materials is reduced.

The specific implementation mode is eight: the embodiment is described by combining with figures 1-3, a nanofiltration device for the deep purification treatment of uranium-containing wastewater from uranium purification and conversion, the first-stage treatment mechanism 17 comprises a first nanofiltration raw water tank 1 and a first nanofiltration membrane group 3, the first nanofiltration raw water tank 1 is connected with the first nanofiltration membrane group 3 through a pipeline, a concentrated solution generated when the first nanofiltration membrane group 3 of the first-stage treatment mechanism 17 treats wastewater flows into a fourth nanofiltration raw water tank 10 of the concentrated solution treatment mechanism 20 through a pipeline, then flows into a fourth nanofiltration membrane group 12 of the concentrated solution treatment mechanism 20 to be subjected to volume reduction concentration, a uranium-containing wastewater concentrated solution subjected to volume reduction concentration flows into a concentrated solution tank 13 through a concentrated solution port of the fourth nanofiltration membrane group 12, a clear solution flows back into the first nanofiltration raw water tank 1 of the first-stage treatment mechanism 17 through a clear solution port of the fourth nanofiltration membrane group 12 to be subjected to lower-stage filtration, and high-concentration uranium-containing wastewater in the concentrated solution tank 13 is discharged through a pipeline.

The specific implementation method nine: the embodiment is described by combining fig. 1-fig. 3, a nanofiltration device for advanced purification treatment of uranium purification conversion uranium-containing wastewater, further comprising a cleaning water tank 15 and a cleaning water pump 16, the cleaning water pump 16 is installed at the outlet end of the cleaning water tank 15, the cleaning water tank 15 is respectively connected with the concentrate ports of the first nanofiltration membrane group 3 and the fourth nanofiltration membrane group 12 through a plurality of pipelines, when the two nanofiltration membrane groups are used for a long time, the purification treatment effect of the nanofiltration membrane groups is weakened, cleaning water is introduced from the concentrate ports of the nanofiltration membrane groups through the cleaning water tank 15 and is discharged from the concentrate ports, the surface of the nanofiltration membrane groups is cleaned, and the purification treatment effect of the nanofiltration membrane groups is improved.

The detailed implementation mode is ten: the embodiment is described with reference to fig. 1 to 3, a nanofiltration device for advanced purification treatment of uranium purification conversion uranium-containing wastewater, wherein a first feed pump 2 is installed between a first nanofiltration raw water tank 1 and a first nanofiltration membrane group 3, a fourth feed pump 11 is installed between a fourth nanofiltration raw water tank 10 and a fourth nanofiltration membrane group 12, the first nanofiltration raw water tank 1 and the fourth nanofiltration raw water tank 10 are both made of PE material or glass steel material, the nanofiltration membranes of the first nanofiltration membrane group 3 and the fourth nanofiltration membrane group 12 are both polyamide tubular composite membrane, the first feed pump 2, the fourth feed pump 11 and the concentrated liquid pump 14 are all made of S316L stainless steel material or liner tetrafluoroethylene material, and as the pipeline, pipe fittings, equipment and instrument overflow components in contact with wastewater need to resist corrosion of hydrofluoric acid, nitric acid and alkali, the overflow components of all pipe fittings and feed pumps all adopt S316L stainless steel material or liner tetrafluoroethylene material, each nanofiltration raw water tank adopts PE or glass steel material, for preventing that radioactive waste water from causing the irradiation damage to organic material, nanofiltration membrane in the nanofiltration device adopts polyamide tubular composite membrane, and each nanofiltration membrane group water inlet is provided with temperature-detecting device, and the security of uranium waste water deep purification processing during operation improves when the device high temperature stop the operation and report to the police.

The concrete implementation mode eleven: the treatment method implemented by the nanofiltration device for the advanced purification treatment of uranium-purifying and converting uranium-containing wastewater according to the embodiment is described with reference to fig. 1 to 3, and comprises the following steps:

step two: the uranium-containing wastewater concentrated solution after primary purification treatment flows into a fourth nanofiltration raw water tank 10 of a concentrated solution treatment mechanism 20 through a concentrated solution port of a first nanofiltration membrane group 3, the uranium-containing wastewater concentrated solution flows into a fourth nanofiltration membrane group 12 through a pipeline for volume reduction compression, the uranium-containing wastewater concentrated solution after volume reduction compression flows into a concentrated solution tank 13 through a concentrated solution port of the fourth nanofiltration membrane group 12, a concentrated solution pump 14 is opened to discharge high-concentration uranium-containing wastewater in the concentrated solution tank 13 and carry out ammonium salt precipitation, and metal uranium is recycled;

step three: and (3) enabling the uranium-containing wastewater clear liquid subjected to volume reduction and compression by the fourth nanofiltration membrane group 12 to flow back into the first nanofiltration raw water tank 1 through a clear liquid port of the fourth nanofiltration membrane group 12, and repeating the step one.

The specific implementation mode twelve: the embodiment is described by combining fig. 1-fig. 3, a nanofiltration device for advanced purification treatment of uranium-containing wastewater from uranium purification and conversion comprises a multi-stage treatment mechanism and at least one stage of concentrated solution treatment mechanism 20, the multi-stage treatment mechanism is arranged in series, each stage of treatment mechanism comprises a nanofiltration raw water tank and a nanofiltration membrane group, the nanofiltration raw water tank is connected with the nanofiltration membrane group through a pipeline, a clear liquid port of each stage of nanofiltration membrane group is sequentially connected with a lower stage of nanofiltration raw water tank through a pipeline, concentrate ports of the nanofiltration membrane groups below the secondary stage and the secondary stage are connected with a first stage of nanofiltration raw water tank through a pipeline, the first stage treatment mechanism 17 is arranged in series with the concentrated solution treatment mechanism 20, the treatment mechanisms below the secondary stage and the secondary stage are arranged in parallel with the concentrated solution treatment mechanism 20, the uranium-containing wastewater after advanced purification treatment by the multi-stage treatment mechanism has a uranium content of less than 0.05mg/L and can be discharged when reaching the wastewater discharge standard, the uranium-bearing waste water concentrated solution treated by the primary treatment mechanism 17 flows into the concentrated solution treatment mechanism 20 through a pipeline, the uranium-bearing waste water concentrated solution treated by the concentrated solution treatment mechanism 20 is precipitated to extract uranium metal, and the clear liquid flows back into the primary treatment mechanism 17 through a pipeline.

The specific implementation mode is thirteen: the embodiment is described in conjunction with fig. 1-fig. 3, a nanofiltration device for uranium purification conversion uranium-bearing waste water deep purification treatment, further include concentrate tank 13 and concentrate pump 14, concentrate treatment mechanism 20 is connected with concentrate tank 13, concentrate pump 14 is installed to the flowing back end of concentrate tank 13, uranium-bearing waste water concentrate filtered through fourth nanofiltration membrane group 12 flows into concentrate tank 13 through the pipeline in, high concentration uranium-bearing waste water in concentrate tank 13 passes through the pipeline and discharges, concentrate pump 14 provides power for high concentration uranium-bearing waste water, the high concentration uranium-bearing waste water of exhaust can directly carry out ammonium salt precipitation, retrieve metal uranium, reduce the loss of nuclear material.

The specific implementation mode is fourteen: the embodiment is described with reference to fig. 1 to 3, a nanofiltration device for advanced purification treatment of uranium purification conversion uranium-containing wastewater, the multistage treatment mechanism comprises a primary treatment mechanism 17, a secondary treatment mechanism 18 and a tertiary treatment mechanism 19, the primary treatment mechanism 17, the secondary treatment mechanism 18 and the tertiary treatment mechanism 19 are sequentially connected through a pipeline, the primary treatment mechanism 17 comprises a first nanofiltration raw water tank 1 and a first nanofiltration membrane group 3, the secondary treatment mechanism 18 comprises a second nanofiltration raw water tank 4 and a second nanofiltration membrane group 6, the tertiary treatment mechanism 19 comprises a third nanofiltration raw water tank 7 and a third nanofiltration membrane group 9, the first nanofiltration raw water tank 1 is connected with the first nanofiltration membrane group 3 through a pipeline, a clear liquid port of the first nanofiltration membrane group 3 is connected with the second nanofiltration raw water tank 4 through a pipeline, the second raw water tank 4 is connected with the second nanofiltration membrane group 6 through a pipeline, a clear liquid port of the second nanofiltration membrane group 6 is connected with a third nanofiltration raw water tank 7 through a pipeline, the third nanofiltration raw water tank 7 is connected with a third nanofiltration membrane group 9 through a pipeline, a clear liquid port of the third nanofiltration membrane group 9 is connected with a discharge pipe, thick liquid ports of the second nanofiltration membrane group 6 and the third nanofiltration membrane group 9 are connected with a first nanofiltration raw water tank 1 through a pipeline, the thick solution treatment mechanism 20 comprises a fourth nanofiltration raw water tank 10 and a fourth nanofiltration membrane group 12, the fourth nanofiltration raw water tank 10 is connected with a thick liquid port of the first nanofiltration membrane group 3 through a pipeline, the fourth nanofiltration raw water tank 10 is connected with the fourth nanofiltration membrane group 12 through a pipeline, a clear liquid port of the fourth nanofiltration membrane group 12 is connected with the first nanofiltration raw water tank 1 through a pipeline, a thick liquid port of the fourth nanofiltration membrane group 12 is connected with a thick liquid tank 13 through a pipeline, uranium purification conversion wastewater to be treated is firstly discharged into the first nanofiltration raw water tank 1 of the primary treatment mechanism 17, flows into the first nanofiltration membrane group 3 through a pipeline to perform primary purification treatment, uranium wastewater clear liquid after the primary purification treatment flows into the second nanofiltration raw water tank 4 of the secondary treatment mechanism 18 through a pipeline, then flows into the second nanofiltration membrane group 6 through a pipeline to perform secondary purification treatment, uranium wastewater clear liquid after the secondary purification treatment flows into the third nanofiltration raw water tank 7 of the tertiary treatment structure 19 through a pipeline, uranium wastewater clear liquid flows into the third nanofiltration membrane group 9 through a pipeline to perform tertiary purification treatment, the uranium wastewater clear liquid after the tertiary purification treatment has a uranium content of less than 0.05mg/L to reach the wastewater discharge standard, the uranium wastewater clear liquid is discharged through a pipeline, the uranium wastewater concentrated solution after the purification treatment of the second nanofiltration membrane group 6 and the third nanofiltration membrane group 9 flows back into the first nanofiltration raw water tank 1 through a pipeline to perform purification treatment, the concentrated solution generated when wastewater is treated by the first nanofiltration membrane group 3 of the primary treatment mechanism 17 flows into the concentrated solution treatment mechanism 20 through a pipeline Then flows into a fourth nanofiltration membrane group 12 of a concentrated solution processing mechanism 20 for volume reduction and concentration, the uranium-containing wastewater concentrated solution after volume reduction and concentration flows into a concentrated solution tank 13 from a concentrated solution port of the fourth nanofiltration membrane group 12, a clear solution flows back into the first nanofiltration raw water tank 1 of the primary processing mechanism 17 from a clear solution port of the fourth nanofiltration membrane group 12 for lower-stage filtration, and the high-concentration uranium-containing wastewater in the concentrated solution tank 13 is discharged through a pipeline.

The concrete implementation mode is fifteen: the embodiment is described by combining fig. 1-fig. 3, a nanofiltration device for advanced purification treatment of uranium purification conversion uranium-containing wastewater, further comprising a cleaning water tank 15 and a cleaning water pump 16, the cleaning water pump 16 is installed at the outlet end of the cleaning water tank 15, the cleaning water tank 15 is respectively connected with the concentrate ports of the first nanofiltration membrane group 3, the second nanofiltration membrane group 6, the third nanofiltration membrane group 9 and the fourth nanofiltration membrane group 12 through a plurality of pipelines, and an independent cleaning water tank 15 is designed.

The specific implementation mode is sixteen: the present embodiment is described with reference to fig. 1 to fig. 3, which is a nanofiltration device for advanced purification treatment of uranium purification conversion uranium-containing wastewater, wherein a first feed pump 2 is installed between a first nanofiltration raw water tank 1 and a first nanofiltration membrane group 3, a second feed pump 5 is installed between a second nanofiltration raw water tank 4 and a second nanofiltration membrane group 6, a third feed pump 8 is installed between a third nanofiltration raw water tank 7 and a third nanofiltration membrane group 9, a fourth feed pump 11 is installed between a fourth nanofiltration raw water tank 10 and a fourth nanofiltration membrane group 12, and the feed pumps are used for providing power for uranium wastewater input to each stage of nanofiltration membrane group.

Seventeenth embodiment: with reference to fig. 1-3, the present embodiment is described, in which a nanofiltration device for advanced purification treatment of uranium purification conversion uranium-containing wastewater is provided, the cutoff molecular weight of the first nanofiltration membrane group 3 is 300 dalton, the cutoff molecular weights of the second nanofiltration membrane group 3, the third nanofiltration membrane group 9 and the fourth nanofiltration membrane group 12 are 150 dalton, the first nanofiltration raw water tank 1, the second nanofiltration raw water tank 4, the third nanofiltration raw water tank 7 and the fourth nanofiltration raw water tank 10 are all made of PE material or glass steel material, the nanofiltration membranes of the first nanofiltration membrane group 3, the second nanofiltration membrane group 6, the third nanofiltration membrane group 9 and the fourth nanofiltration membrane group 12 are all polyamide tubular composite membranes, and the first feed pump 2, the second feed pump 5, the third feed pump 8, the fourth feed pump 11 and the concentrated feed pump 4 are all made of S316L stainless steel material or tetrafluoroethylene lining material, because of the pipeline, the second feed pump, the third feed pump, the fourth feed pump and the concentrated feed pump are in contact with wastewater, The pipe fitting, equipment and instrument overflow the piece and all need be able to bear or endure hydrofluoric acid, the corruption of nitric acid and alkali, consequently, the part that overflows of all pipe fittings and feed pump all adopts S316L stainless steel or inside lining tetrafluoroethylene material, each nanofiltration raw water jar adopts PE or glass steel material, for preventing that radioactive waste water from leading to the fact the irradiation damage to organic material, nanofiltration membrane in the nanofiltration device adopts polyamide tubular composite membrane, each nanofiltration membrane group water inlet is provided with temperature-detecting device, when the device high temperature out-of-service and warning, improve the security of uranium waste water deep purification processing during operation.

The specific implementation mode is eighteen: the treatment method implemented by the nanofiltration device for the advanced purification treatment of uranium-purifying and converting uranium-containing wastewater according to the embodiment is described with reference to fig. 1 to 3, and comprises the following steps:

step two: the uranium-containing wastewater clear solution after primary purification treatment flows into a second nanofiltration raw water tank 4 of a secondary treatment mechanism 18 through a clear solution port of a first nanofiltration membrane group 3, the uranium-containing wastewater flows into a second nanofiltration membrane group 6 through a pipeline to realize secondary purification treatment, the uranium-containing wastewater concentrated solution after primary purification treatment flows into a fourth nanofiltration raw water tank 10 of a concentrated solution treatment mechanism 20 through a concentrated solution port of the first nanofiltration membrane group 3, the uranium-containing wastewater concentrated solution flows into a fourth nanofiltration membrane group 12 through a pipeline to be subjected to volume reduction compression, the uranium-containing wastewater concentrated solution after volume reduction compression flows into a concentrated solution tank 13 through a concentrated solution port of the fourth nanofiltration membrane group 12, a concentrated solution pump 14 is opened to discharge the high-concentration uranium-containing wastewater in the concentrated solution tank 13 and perform ammonium salt precipitation to recover metallic uranium;

step five: and enabling the uranium-containing wastewater concentrated solution after the secondary purification treatment and the tertiary purification treatment to flow back into the first nanofiltration raw water tank 1 of the primary treatment mechanism 17 through a pipeline, enabling the uranium-containing wastewater clear solution after the volume reduction and compression of the fourth nanofiltration membrane group 12 to flow back into the first nanofiltration raw water tank 1 through a clear solution port of the fourth nanofiltration membrane group 12, and repeating the step one.

This embodiment is merely illustrative of the present patent and does not limit the scope of the patent, and those skilled in the art can make modifications to its part without departing from the spirit and scope of the patent.

Claims

1. The utility model provides a receive filter equipment that is used for uranium purification conversion uranium-bearing waste water deep purification to handle which characterized in that: the device comprises a multi-stage treatment mechanism, wherein the multi-stage treatment mechanism is arranged in series, each stage treatment mechanism comprises a nanofiltration raw water tank and a nanofiltration membrane group, the nanofiltration raw water tank is connected with the nanofiltration membrane group through a pipeline, a clear liquid port of each stage nanofiltration membrane group is sequentially connected with a lower stage nanofiltration raw water tank through a pipeline, and concentrated liquid ports of the nanofiltration membrane groups below a secondary stage and a secondary stage are connected with a first stage nanofiltration raw water tank through a pipeline.

2. The nanofiltration device of claim 1, wherein the nanofiltration device is used for advanced purification treatment of uranium-bearing wastewater from uranium purification and conversion, and is characterized in that: the multistage treatment mechanism comprises a first-stage treatment mechanism (17), a second-stage treatment mechanism (18) and a third-stage treatment mechanism (19), the first-stage treatment mechanism (17), the second-stage treatment mechanism (18) and the third-stage treatment mechanism (19) are sequentially connected through a pipeline, the first-stage treatment mechanism (17) comprises a first nanofiltration raw water tank (1) and a first nanofiltration membrane group (3), the second-stage treatment mechanism (18) comprises a second nanofiltration raw water tank (4) and a second nanofiltration membrane group (6), the third-stage treatment mechanism (19) comprises a third nanofiltration raw water tank (7) and a third nanofiltration membrane group (9), the first nanofiltration raw water tank (1) is connected with the first nanofiltration membrane group (3) through a pipeline, a clear liquid port of the first nanofiltration membrane group (3) is connected with the second raw water tank (4) through a pipeline, the second nanofiltration raw water tank (4) is connected with the second nanofiltration membrane group (6) through a pipeline, the clear liquid port of the second nanofiltration membrane group (6) is connected with the third nanofiltration raw water tank (7) through a pipeline, the third nanofiltration raw water tank (7) is connected with the third nanofiltration membrane group (9) through a pipeline, the clear liquid port of the third nanofiltration membrane group (9) is connected with the discharge pipe, and the concentrated liquid ports of the second nanofiltration membrane group (6) and the third nanofiltration membrane group (9) are connected with the first nanofiltration raw water tank (1) through a pipeline.

3. The nanofiltration device of claim 2, wherein the nanofiltration device is used for the advanced purification treatment of uranium-bearing wastewater from uranium purification and conversion, and is characterized in that: the device is characterized by further comprising a cleaning water tank (15) and a cleaning water pump (16), wherein the cleaning water pump (16) is installed at the outlet end of the cleaning water tank (15), and the cleaning water tank (15) is connected with concentrated liquid ports of the first nanofiltration membrane group (3), the second nanofiltration membrane group (6) and the third nanofiltration membrane group (9) through a plurality of pipelines respectively.

4. The nanofiltration device of claim 3, wherein the nanofiltration device is used for the advanced purification treatment of uranium-bearing wastewater from uranium purification and conversion, and is characterized in that: a first feeding pump (2) is installed between the first nanofiltration raw water tank (1) and the first nanofiltration membrane group (3), a second feeding pump (5) is installed between the second nanofiltration raw water tank (4) and the second nanofiltration membrane group (6), and a third feeding pump (8) is installed between the third nanofiltration raw water tank (7) and the third nanofiltration membrane group (9).

5. The nanofiltration device according to any one of claims 2 to 4, wherein the nanofiltration device is used for deep purification treatment of uranium-purified and converted uranium-containing wastewater, and is characterized in that: the molecular weight cut-off of the first nanofiltration membrane group (3) is 300 daltons, and the molecular weight cut-off of the second nanofiltration membrane group (6) and the third nanofiltration membrane group (9) is 150 daltons.

6. The nanofiltration device according to any one of claims 2 to 4, wherein the nanofiltration device is used for deep purification treatment of uranium-purified and converted uranium-containing wastewater, and is characterized in that: the first nanofiltration raw water tank (1), the second nanofiltration raw water tank (4) and the third nanofiltration raw water tank (7) are all made of PE materials or glass steel materials, and nanofiltration membranes of the first nanofiltration membrane group (3), the second nanofiltration membrane group (6) and the third nanofiltration membrane group (9) are all polyamide tubular composite membranes.

7. The nanofiltration device of claim 4, wherein the nanofiltration device is used for the advanced purification treatment of uranium-bearing wastewater from uranium purification and conversion, and is characterized in that: the first feeding pump (2), the second feeding pump (5) and the third feeding pump (8) are all made of S316L stainless steel or tetrafluoroethylene lining.

8. A method for deeply purifying uranium-bearing wastewater from uranium purification and conversion, which uses the nanofiltration device of any one of claims 2 to 7, and comprises the following steps:

the method comprises the following steps: inputting the uranium-containing wastewater to be treated after purification and conversion into a first nanofiltration raw water tank (1) of a primary treatment mechanism (17), and enabling the uranium-containing wastewater to be treated after purification and conversion to flow into a first nanofiltration membrane group (3) through a pipeline to realize primary purification treatment;

step two: the uranium-bearing waste water clear solution after the primary purification treatment flows into a second nanofiltration raw water tank (4) of a secondary treatment mechanism (18) through a clear solution port of a first nanofiltration membrane group (3), and the uranium-bearing waste water flows into a second nanofiltration membrane group (6) through a pipeline to realize the secondary purification treatment;

step three: the uranium-bearing wastewater clear solution after the secondary purification treatment flows into a third nanofiltration raw water tank (7) of a tertiary treatment mechanism (19) through a clear solution port of a second nanofiltration membrane group (6), and the uranium-bearing wastewater flows into a third nanofiltration membrane group (9) through a pipeline to realize the tertiary purification treatment;

step four: the uranium content of the uranium-containing wastewater clear solution after the three-stage purification treatment is less than 0.05mg/L, the uranium-containing wastewater clear solution reaches the discharge standard, and the uranium-containing wastewater clear solution is discharged through a clear solution port of a third nanofiltration membrane group (9);

step five: and enabling the uranium-containing wastewater concentrated solution after the second-stage purification treatment and the third-stage purification treatment to flow back into the first nanofiltration raw water tank (1) of the first-stage treatment mechanism (17) through a pipeline, and repeating the step one.

9. The utility model provides a receive filter equipment that is used for uranium purification conversion uranium-bearing waste water deep purification to handle which characterized in that: the device comprises a first-stage treatment mechanism (17), a concentrated solution treatment mechanism (20), a concentrated solution tank (13) and a concentrated solution pump (14), wherein the concentrated solution treatment mechanism (20) is connected with the first-stage treatment mechanism (17) in series, the concentrated solution treatment mechanism (20) is connected with the concentrated solution tank (13), and the concentrated solution pump (14) is installed at the liquid discharge end of the concentrated solution tank (13).

10. The nanofiltration device of claim 9, wherein the nanofiltration device is used for advanced purification treatment of uranium-purified and converted wastewater containing uranium: the first-stage treatment mechanism (17) comprises a first nanofiltration raw water tank (1) and a first nanofiltration membrane group (3), the first nanofiltration raw water tank (1) is connected with the first nanofiltration membrane group (3) through a pipeline, the concentrated solution treatment mechanism (20) comprises a fourth nanofiltration raw water tank (10) and a fourth nanofiltration membrane group (12), the fourth nanofiltration raw water tank (10) is connected with a concentrated solution port of the first nanofiltration membrane group (3) through a pipeline, the fourth nanofiltration raw water tank (10) is connected with the fourth nanofiltration membrane group (12) through a pipeline, the concentrated solution port of the fourth nanofiltration membrane group (12) is connected with a concentrated solution tank (13) through a pipeline, and a clear solution port of the fourth nanofiltration membrane group (12) is connected with the first nanofiltration raw water tank (1) through a pipeline.

11. The nanofiltration device of claim 10, wherein the nanofiltration device is used for advanced purification treatment of uranium-purified and converted wastewater containing uranium: the device is characterized by further comprising a cleaning water tank (15) and a cleaning water pump (16), wherein the cleaning water pump (16) is installed at the outlet end of the cleaning water tank (15), and the cleaning water tank (15) is connected with concentrated liquid ports of the first nanofiltration membrane group (3) and the fourth nanofiltration membrane group (12) through a plurality of pipelines respectively.

12. The nanofiltration device of claim 11, wherein the nanofiltration device is used for the advanced purification treatment of uranium-bearing wastewater from uranium purification and conversion, and is characterized in that: a first feeding pump (2) is installed between the first nanofiltration raw water tank (1) and the first nanofiltration membrane group (3), and a fourth feeding pump (11) is installed between the fourth nanofiltration raw water tank (10) and the fourth nanofiltration membrane group (12).

13. A nanofiltration device according to any one of claims 10 to 12, wherein the nanofiltration device is used for the deep purification treatment of uranium-purified and converted wastewater containing uranium: the molecular weight cut-off of the first nanofiltration membrane group (3) is 300 daltons, and the molecular weight cut-off of the fourth nanofiltration membrane group (12) is 150 daltons.

14. A nanofiltration device according to any one of claims 10 to 12, wherein the nanofiltration device is used for the deep purification treatment of uranium-purified and converted wastewater containing uranium: the first nanofiltration raw water tank (1) and the fourth nanofiltration raw water tank (10) are both made of PE materials or glass steel materials, and the nanofiltration membranes of the first nanofiltration membrane group (3) and the fourth nanofiltration membrane group (12) are both polyamide tubular composite membranes.

15. The nanofiltration device of claim 12, wherein the nanofiltration device is used for advanced purification treatment of uranium-purified and converted wastewater containing uranium: the first feeding pump (2), the fourth feeding pump (11) and the concentrated solution pump (14) are all made of S316L stainless steel or tetrafluoroethylene-lined material.

16. A method for the advanced purification treatment of uranium purification conversion uranium-bearing wastewater, using a nanofiltration device according to any one of claims 10 to 15, the method performing the following steps:

step two: enabling the uranium-containing wastewater concentrated solution subjected to primary purification treatment to flow into a fourth nanofiltration raw water tank (10) of a concentrated solution treatment mechanism (20) through a concentrated solution port of a first nanofiltration membrane group (3), enabling the uranium-containing wastewater concentrated solution to flow into a fourth nanofiltration membrane group (12) through a pipeline for volume reduction and compression, enabling the uranium-containing wastewater concentrated solution subjected to volume reduction and compression to flow into a concentrated solution tank (13) through a concentrated solution port of the fourth nanofiltration membrane group (12), opening a concentrated solution pump (14) to discharge the high-concentration uranium-containing wastewater in the concentrated solution tank (13), performing ammonium salt precipitation, and recycling metallic uranium; and (3) enabling the uranium-containing wastewater clear liquid subjected to volume reduction and compression by the fourth nanofiltration membrane group (12) to flow back into the first nanofiltration raw water tank (1) through a clear liquid port of the fourth nanofiltration membrane group (12), and repeating the step one.

17. The utility model provides a receive filter equipment that is used for uranium purification conversion uranium-bearing waste water deep purification to handle which characterized in that: the device comprises a primary treatment mechanism (17), a multi-stage treatment mechanism and a concentrated solution treatment mechanism (20), wherein the multi-stage treatment mechanism is arranged in series, each stage treatment mechanism comprises a nanofiltration raw water tank and a nanofiltration membrane group, the nanofiltration raw water tank is connected with the nanofiltration membrane group through a pipeline, a clear liquid port of each stage nanofiltration membrane group is sequentially connected with a lower stage nanofiltration raw water tank through a pipeline, concentrated liquid ports of nanofiltration membrane groups below a secondary stage and a secondary stage are connected with the primary nanofiltration raw water tank through a pipeline, the primary treatment mechanism (17) is arranged in series with the concentrated solution treatment mechanism (20), and the treatment mechanisms below the secondary stage and the secondary stage are arranged in parallel with the concentrated solution treatment mechanism (20).

18. The nanofiltration device of claim 17, wherein the nanofiltration device is used for advanced purification treatment of uranium-purified and converted wastewater containing uranium: the device is characterized by further comprising a concentrated solution tank (13) and a concentrated solution pump (14), wherein the concentrated solution processing mechanism (20) is connected with the concentrated solution tank (13), and the concentrated solution pump (14) is installed at the liquid discharge end of the concentrated solution tank (13).

19. The nanofiltration device of claim 18, wherein the nanofiltration device is used for advanced purification treatment of uranium-purified and converted wastewater containing uranium: the multistage treatment mechanism comprises a first-stage treatment mechanism (17), a second-stage treatment mechanism (18) and a third-stage treatment mechanism (19), the first-stage treatment mechanism (17), the second-stage treatment mechanism (18) and the third-stage treatment mechanism (19) are sequentially connected through a pipeline, the first-stage treatment mechanism (17) comprises a first nanofiltration raw water tank (1) and a first nanofiltration membrane group (3), the second-stage treatment mechanism (18) comprises a second nanofiltration raw water tank (4) and a second nanofiltration membrane group (6), the third-stage treatment mechanism (19) comprises a third nanofiltration raw water tank (7) and a third nanofiltration membrane group (9), the first nanofiltration raw water tank (1) is connected with the first nanofiltration membrane group (3) through a pipeline, a clear liquid port of the first nanofiltration membrane group (3) is connected with the second raw water tank (4) through a pipeline, the second nanofiltration raw water tank (4) is connected with the second nanofiltration membrane group (6) through a pipeline, a clear liquid port of the second nanofiltration membrane group (6) is connected with a third nanofiltration raw water tank (7) through a pipeline, the third nanofiltration raw water tank (7) is connected with a third nanofiltration membrane group (9) through a pipeline, a clear liquid port of the third nanofiltration membrane group (9) is connected with a discharge pipe, concentrated liquid ports of the second nanofiltration membrane group (6) and the third nanofiltration membrane group (9) are connected with the first nanofiltration raw water tank (1) through a pipeline, the concentrated solution treatment mechanism (20) comprises a fourth nanofiltration raw water tank (10) and a fourth nanofiltration membrane group (12), the fourth nanofiltration raw water tank (10) is connected with a concentrated solution port of the first nanofiltration membrane group (3) through a pipeline, the fourth nanofiltration raw water tank (10) is connected with the fourth nanofiltration membrane group (12) through a pipeline, a clear solution port of the fourth nanofiltration membrane group (12) is connected with the first nanofiltration raw water tank (1) through a pipeline, and a concentrated solution port of the fourth nanofiltration membrane group (12) is connected with a concentrated solution tank (13) through a pipeline.

20. The nanofiltration device of claim 19, wherein the nanofiltration device is used for the advanced purification treatment of uranium-purified and converted wastewater containing uranium: the filter is characterized by further comprising a cleaning water tank (15) and a cleaning water pump (16), wherein the cleaning water pump (16) is installed at the outlet end of the cleaning water tank (15), and the cleaning water tank (15) is connected with concentrated liquid ports of the first nanofiltration membrane group (3), the second nanofiltration membrane group (6), the third nanofiltration membrane group (9) and the fourth nanofiltration membrane group (12) through a plurality of pipelines respectively.

21. The nanofiltration device of claim 20, wherein the nanofiltration device is used for the advanced purification treatment of uranium-purified and converted wastewater containing uranium: install first feed pump (2) between first nanofiltration raw water tank (1) and first nanofiltration membrane group (3), install second feed pump (5) between second nanofiltration raw water tank (4) and second nanofiltration membrane group (6), install third feed pump (8) between third nanofiltration raw water tank (7) and third nanofiltration membrane group (9), install fourth feed pump (11) between fourth nanofiltration raw water tank (10) and fourth nanofiltration membrane group (12).

22. A nanofiltration device according to claims 19 to 21, wherein the nanofiltration device is used for the advanced purification treatment of uranium-bearing wastewater from the purification and conversion of uranium, and is characterized in that: the molecular weight cut-off of the first nanofiltration membrane group (3) is 300 daltons, and the molecular weight cut-off of the second nanofiltration membrane group (6), the third nanofiltration membrane group (9) and the fourth nanofiltration membrane group (12) is 150 daltons.

23. A nanofiltration device according to claims 19 to 21, wherein the nanofiltration device is used for the advanced purification treatment of uranium-bearing wastewater from the purification and conversion of uranium, and is characterized in that: the first nanofiltration raw water tank (1), the second nanofiltration raw water tank (4), the third nanofiltration raw water tank (7) and the fourth nanofiltration raw water tank (10) are all made of PE materials or glass steel materials, and nanofiltration membranes of the first nanofiltration membrane group (3), the second nanofiltration membrane group (6), the third nanofiltration membrane group (9) and the fourth nanofiltration membrane group (12) are all polyamide tubular composite membranes.

24. The nanofiltration device of claim 21, wherein the nanofiltration device is used for the advanced purification treatment of uranium-purified and converted wastewater containing uranium: the first feeding pump (2), the second feeding pump (5), the third feeding pump (8), the fourth feeding pump (11) and the concentrated solution pump (14) are all made of S316L stainless steel materials or tetrafluoroethylene lining materials.

25. A method for the advanced purification treatment of uranium purification conversion uranium-bearing wastewater, using a nanofiltration device according to any one of claims 17 to 21, the method performing the following steps:

step two: enabling the uranium-containing wastewater clear solution subjected to primary purification treatment to flow into a second nanofiltration raw water tank (4) of a secondary treatment mechanism (18) through a clear solution port of a first nanofiltration membrane group (3), enabling the uranium-containing wastewater to flow into a second nanofiltration membrane group (6) through a pipeline to realize secondary purification treatment, enabling a uranium-containing wastewater concentrated solution subjected to primary purification treatment to flow into a fourth nanofiltration raw water tank (10) of a concentrated solution treatment mechanism (20) through a concentrated solution port of the first nanofiltration membrane group (3), enabling the uranium-containing wastewater concentrated solution to flow into a fourth nanofiltration membrane group (12) through a pipeline to perform volume reduction compression, enabling the uranium-containing wastewater concentrated solution subjected to volume reduction compression to flow into a concentrated solution tank (13) through a concentrated solution port of the fourth nanofiltration membrane group (12), opening a concentrated solution pump (14) to discharge the high-concentration uranium-containing wastewater in the concentrated solution tank (13), performing ammonium salt precipitation, and recovering metallic uranium;

step five: and enabling the uranium-containing wastewater concentrated solution after the secondary purification treatment and the tertiary purification treatment to flow back into the first nanofiltration raw water tank (1) of the primary treatment mechanism (17) through a pipeline, enabling the uranium-containing wastewater clear solution after volume reduction and compression of the fourth nanofiltration membrane group (12) to flow back into the first nanofiltration raw water tank (1) through a clear solution port of the fourth nanofiltration membrane group (12), and repeatedly performing the step one.