CN209853770U

CN209853770U - Device for recovering high-purity sodium sulfate in mixed high-salt wastewater by freezing method

Info

Publication number: CN209853770U
Application number: CN201822264666.4U
Authority: CN
Inventors: 阮玉根; 阮垚
Original assignee: RUANSHI CHEMICAL (CHANGSHU) Co Ltd
Current assignee: RUANSHI CHEMICAL (CHANGSHU) Co Ltd
Priority date: 2018-12-31
Filing date: 2018-12-31
Publication date: 2019-12-27
Anticipated expiration: 2028-12-31

Abstract

The utility model discloses a device for recovering high-purity sodium sulfate in mixed high-salinity wastewater by a freezing method, which comprises a freezing crystallizer and a refrigerating device; the freezing crystallizer comprises a barrel and a stirring device, wherein the barrel is divided into a crystallization bin, an overflow bin and a crystal growing bin from top to bottom, the crystallization bin and the crystal growing bin are integrally connected, the overflow bin is arranged in an area between the crystallization bin and the crystal growing bin, and the stirring device is inserted from the top of the barrel and extends into the overflow bin; the two sides of the top of the crystallization bin are provided with a high-salinity wastewater inlet and a refrigerating fluid inlet, one side of the long crystal bin is provided with a crystal outlet, and the bottom end of the overflow bin is provided with an overflow pipe penetrating through the side wall of the long crystal bin; the refrigerating device is connected with the freezing crystallizer. The utility model discloses a structural design of cold freezing crystallizer adopts the frozen method of low temperature, makes the mixed high salt waste water of sodium sulfate and sodium chloride effectively separate in freezing crystallizer to obtain the sodium sulfate crystal of high purity, thoroughly solved the environmental pollution problem that high salt waste water caused.

Description

Device for recovering high-purity sodium sulfate in mixed high-salt wastewater by freezing method

Technical Field

The utility model relates to an industrial wastewater treatment field especially relates to a device of high-purity sodium sulfate in mixed high salt waste water is retrieved to freezing method.

Background

At present, the treatment method of mixed high-salinity wastewater containing sodium sulfate and sodium chloride generally adopts an evaporation concentration crystallization method to recover crystallized salt products. However, because the wastewater is mixed waste water of various salts, the salt product generated after crystallization is also a mixed salt of sodium sulfate and sodium chloride, and cannot be recycled. And the mixed salt recovered by the existing evaporation concentration crystallization method can only be subjected to landfill treatment according to solid waste, so that not only is the resource wasted, but also secondary pollution is generated.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the main technical problem who solves provides a device of high-purity sodium sulfate in mixed high salt waste water is retrieved to freezing method, the above-mentioned problem that exists when can solving current mixed high salt waste water treatment.

In order to solve the technical problem, the utility model discloses a technical scheme be: the device for recovering high-purity sodium sulfate in mixed high-salt wastewater by a freezing method comprises the following steps: a freezing crystallizer and a refrigerating device; the freezing crystallizer comprises a cylinder and a stirring device; the barrel is divided into a crystallization bin, an overflow bin and a crystal growing bin from top to bottom, the crystallization bin and the crystal growing bin are integrally connected, the overflow bin is arranged in an area between the crystallization bin and the crystal growing bin, and the stirring device is inserted from the top of the barrel and extends into the overflow bin; the central lines of the crystallization bin, the crystal growing bin, the overflow bin and the stirring device are collinear; the two sides of the top of the crystallization bin are provided with a high-salinity wastewater inlet and a refrigerating fluid inlet, one side of the long crystal bin is provided with a crystal outlet, and the bottom end of the overflow bin is provided with an overflow pipe penetrating through the side wall of the long crystal bin; the refrigerating device is connected with the freezing crystallizer through the freezing liquid inlet.

In a preferred embodiment of the present invention, the long crystallization chamber is a tapered structure with a small-diameter end being a circular arc end, and the inner diameter of the long crystallization chamber gradually decreases from one end of the long crystallization chamber to the circular arc end.

In a preferred embodiment of the present invention, the stirring device comprises a motor, a stirring shaft, a stirring paddle and a guide plate; the motor is arranged on the outer side of the top of the barrel, one end of the stirring shaft is connected with the motor, and the other end of the stirring shaft is connected with the stirring paddle and is arranged in the overflow bin; the guide plate is vertically arranged around the stirring shaft.

In a preferred embodiment of the present invention, the refrigerating apparatus comprises a heat exchanger and a refrigerator, and the condensate outlet of the refrigerator is connected to the coolant inlet of the freezing crystallizer.

In a preferred embodiment of the present invention, the separation and recovery device further comprises a waste liquid tank, the cooling liquid inlet of the heat exchanger is communicated with the overflow pipe, and the cooling liquid outlet thereof is communicated with the waste liquid tank.

In a preferred embodiment of the present invention, the separation and recovery apparatus further comprises a filter, and the filter is communicated with the crystal discharge port of the freezing crystallizer.

In a preferred embodiment of the present invention, the filter is further provided with a rinse water inlet and a rinse water outlet, wherein the rinse water outlet is communicated with the high-salt wastewater inlet of the cryocrystallization device through a pipeline.

In a preferred embodiment of the present invention, a water pump is further installed on a pipeline connecting the filter and the cryo-crystallizer.

The utility model has the advantages that: the utility model relates to a device of high-purity sodium sulfate in mixed high salt waste water is retrieved to freezing method adopts the frozen method of low temperature through the structural design of cold crystallization ware, makes the mixed high salt waste water of sodium sulfate and sodium chloride effectively separate in freezing crystallization ware to obtain the sodium sulfate crystal of high purity, realize changing waste into valuables, thoroughly solved the environmental pollution problem that high salt waste water caused, market prospect is wide.

Drawings

FIG. 1 is a schematic perspective view of a preferred embodiment of the apparatus for recycling high-purity sodium sulfate from mixed high-salinity wastewater by freezing method according to the present invention;

the parts in the drawings are numbered as follows: 10. the system comprises a freezing crystallizer, a refrigerating device, a waste liquid pool, a filter, a crystallization bin, a overflow bin, a crystal growing bin, a motor, a stirring shaft, a stirring paddle and a guide plate, wherein the crystallization bin is 11, the overflow bin is 12, the crystal growing bin is 13, the motor is 14, the stirring shaft is 15, the stirring paddle is 16, the guide plate is 17, a high-salinity wastewater inlet is 111, a refrigerating liquid inlet is 112, a crystal discharging port is 131, a crystal discharging port is 132, an overflow pipe 21, a heat exchanger, a refrigerator, a rinsing water inlet is 41, a rinsing water outlet.

Detailed Description

The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, so as to enable those skilled in the art to more easily understand the advantages and features of the present invention, and thereby define the scope of the invention more clearly and clearly.

Referring to fig. 1, an embodiment of the present invention includes:

when the temperature of the pure sodium sulfate in the production process of the freeze precipitation method is-5-0 ℃, the mass content of the residual sodium sulfate in the water is 4%. In the mixed solution of sodium sulfate and sodium chloride, when the mass content of sodium chloride is more than or equal to 4 percent, the sodium sulfate can be completely crystallized under the condition of below 0 ℃.

The utility model discloses a device of high-purity sodium sulfate in mixed high salt waste water is retrieved to freezing method, include: a freezing crystallizer 10 and a refrigerating device 20; the freezing crystallizer 10 comprises a cylinder and a stirring device; the barrel body is divided into a crystallization bin 11, an overflow bin 12 and a long crystal bin 13 from top to bottom, the crystallization bin 11 is integrally connected with the long crystal bin 13, the overflow bin 12 is arranged in an area between the crystallization bin 11 and the long crystal bin 13, the long crystal bin 13 is of a conical structure, the inner diameter of the long crystal bin is gradually reduced from one end of the crystallization bin 11 to the other end of the crystallization bin, and the small-diameter end of the conical structure is an arc end. The stirring device is inserted from the top of the barrel and extends into the overflow bin 12. The central lines of the crystallization bin 11, the crystal growth bin 13, the overflow bin 12 and the stirring device are collinear.

The stirring device comprises a motor 14, a stirring shaft 15, a stirring blade 16 and a guide plate 17. The motor 14 is installed on the outer side of the top of the barrel, one end of the stirring shaft 15 is connected with the motor 14, the other end of the stirring shaft is connected with the stirring blade 16, and the stirring shaft is arranged in the overflow bin 12; the deflector 17 is vertically installed around the stirring shaft 15.

The two sides of the top of the crystallization bin 11 are provided with a high-salt wastewater inlet 111 and a refrigerating fluid inlet 112, one side of the crystal growing bin 13 is provided with a crystal outlet 131, and the bottom end of the overflow bin is provided with an overflow pipe 132 penetrating through the side wall of the crystal growing bin. In addition, the separation and recovery device further comprises a waste liquid pool 30 and a filter 40.

The refrigerating device 20 is connected with the freezing crystallizer 10 through the freezing liquid inlet 18. Specifically, the refrigerating device 20 comprises a heat exchanger 21 and a refrigerator 22, wherein a condensate outlet of the refrigerator 21 is connected with a refrigerating fluid inlet 18 of the freezing crystallizer 10 and is used for conveying refrigerating fluid in the refrigerating crystallizer 10 to freeze and crystallize the mixed high-salt wastewater.

The cooling liquid inlet of the heat exchanger 21 is communicated with the overflow pipe 132, and the cooling liquid outlet thereof is communicated with the waste liquid tank 30, so that the sodium chloride waste liquid led out from the overflow pipe 132 is reused as cooling water, and the energy consumption utilization rate is improved.

The filter 40 is connected to the crystal outlet 131 of the cryo-crystallizer 10, and a rinse water inlet 41 and a rinse water outlet 42 are provided in the filter, so that the collected sodium sulfate crystals are washed and filtered in the filter, and the rinse water is connected to the high-salinity wastewater inlet 17 of the cryo-crystallizer 10 through a pipe provided with a water pump 43, thereby recovering sodium sulfate contained in the rinse water through recrystallization.

The utility model freezes the high-salt waste water to-5-0 ℃ through the refrigerating device, carries out freezing crystallization in the freezing crystallizer 10, and makes sodium sulfate crystal rotate to enter the crystal growing bin 13 through the stirring device, and the sodium chloride overflows from the overflow pipe 132 in the overflow bin, and is used as cooling water to cool the refrigerator, and finally is recovered in the waste liquid pool; in addition, when the solid-liquid in the crystal growing bin 13 reaches a certain proportion, the solid-liquid is discharged from the crystal discharging port of the crystal growing bin 13 and enters the filter 40, and high-purity sodium sulfate crystals are obtained through rinsing and filtering, so that the effective separation of sodium sulfate and sodium chloride is realized.

The utility model relates to a device of high-purity sodium sulfate in mixed high salt waste water is retrieved to freezing method adopts the frozen method of low temperature through the structural design of cold crystallization ware, makes the mixed high salt waste water of sodium sulfate and sodium chloride effectively separate in freezing crystallization ware to obtain the sodium sulfate crystal of high purity, realize changing waste into valuables, thoroughly solved the environmental pollution problem that high salt waste water caused, market prospect is wide.

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship that the products of the present invention are usually placed when used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element to which the term refers must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a device of high-purity sodium sulfate in mixed high salt waste water is retrieved to freezing method which characterized in that includes: a freezing crystallizer and a refrigerating device; the freezing crystallizer comprises a cylinder and a stirring device; the barrel is divided into a crystallization bin, an overflow bin and a crystal growing bin from top to bottom, the crystallization bin and the crystal growing bin are integrally connected, the overflow bin is arranged in an area between the crystallization bin and the crystal growing bin, and the stirring device is inserted from the top of the barrel and extends into the overflow bin; the central lines of the crystallization bin, the crystal growing bin, the overflow bin and the stirring device are collinear; the two sides of the top of the crystallization bin are provided with a high-salinity wastewater inlet and a refrigerating fluid inlet, one side of the long crystal bin is provided with a crystal outlet, and the bottom end of the overflow bin is provided with an overflow pipe penetrating through the side wall of the long crystal bin; the refrigerating device is connected with the freezing crystallizer through the freezing liquid inlet.

2. The device for recovering high-purity sodium sulfate in mixed high-salinity wastewater by using the freezing method according to claim 1, wherein the crystal growing bin is in a conical structure with a small-caliber end being an arc end, and the inner diameter of the crystal growing bin gradually decreases from one end of the crystal growing bin to the arc end.

3. The device for recovering high-purity sodium sulfate in the mixed high-salinity wastewater by the freezing method according to claim 1, wherein the stirring device comprises a motor, a stirring shaft, a stirring blade and a guide plate; the motor is arranged on the outer side of the top of the barrel, one end of the stirring shaft is connected with the motor, and the other end of the stirring shaft is connected with the stirring paddle and is arranged in the overflow bin; the guide plate is vertically arranged around the stirring shaft.

4. The device for recovering high-purity sodium sulfate in mixed high-salt wastewater by the freezing method according to claim 1, wherein the refrigerating device comprises a heat exchanger and a refrigerator, and a condensate outlet of the refrigerator is connected with a freezing liquid inlet of the freezing crystallizer.

5. The device for recovering high-purity sodium sulfate in mixed high-salinity wastewater by the freezing method according to claim 4, characterized in that the refrigerating device further comprises a waste liquid pool, wherein a cooling liquid inlet of the heat exchanger is communicated with the overflow pipe, and a cooling liquid outlet of the heat exchanger is communicated with the waste liquid pool.

6. The apparatus for recovering highly pure sodium sulfate from mixed high-salt wastewater by freezing according to claim 1, wherein said apparatus for recovering highly pure sodium sulfate from mixed high-salt wastewater by freezing further comprises a filter, said filter being in communication with a crystal discharge port of said cryo-crystallizer.

7. The device for recovering high-purity sodium sulfate in mixed high-salinity wastewater by the freezing method according to claim 1, wherein a rinsing water inlet and a rinsing water outlet are further formed in the filter, and the rinsing water outlet is communicated with the high-salinity wastewater inlet of the freezing crystallizer through a pipeline.

8. The device for recovering high-purity sodium sulfate in the mixed high-salinity wastewater by the freezing method according to claim 7, wherein a water pump is further installed on a pipeline for communicating the filter with the freezing crystallizer.