CN210583737U - Sodium sulfate freezing crystallization system - Google Patents
Sodium sulfate freezing crystallization system Download PDFInfo
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- CN210583737U CN210583737U CN201920292913.3U CN201920292913U CN210583737U CN 210583737 U CN210583737 U CN 210583737U CN 201920292913 U CN201920292913 U CN 201920292913U CN 210583737 U CN210583737 U CN 210583737U
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Abstract
The embodiment of the utility model provides a sodium sulfate freezing and crystallizing system, which comprises a raw material tank, a heat exchanger, a crystallizing tank and a centrifuge which are connected in sequence, wherein an ozone gas distribution pipe is arranged in the raw material tank; the ozone gas distribution pipe is connected with an ozone generator. The embodiment of the utility model provides a sodium sulfate freezing crystallization system, through increase ozone gas distribution pipe in the head tank, it is bigger to utilize the solubility of ozone in microthermal water, utilizes the high-efficient oxidizing ability of ozone, can treat the organic matter of the nanofiltration concentrated water of freezing crystallization in the head tank and oxidize and get rid of, has solved the problem that the organic matter influences the purity of the frozen crystal salt of sodium sulfate.
Description
Technical Field
The utility model relates to a sodium sulfate freezing crystallization technical field especially relates to a sodium sulfate freezing crystallization system.
Background
With the development of industrial technology, the discharge amount of waste water, waste gas and waste generated in various industries is continuously increased, and as the environmental standard is increasingly strict, the environmental capacity of some areas is limited, and the technical requirement for zero discharge of industrial waste water is greatly increased. The industrial wastewater is concentrated to form a mixed solution of sodium chloride and sodium sulfate, and simultaneously, a certain amount of organic matters which are difficult to biodegrade are contained in the wastewater; sodium chloride, sodium sulfate and organic matters can be separated by a nanofiltration membrane, and the obtained nanofiltration product water mainly contains sodium chloride and a small amount of micromolecular organic matters; the nanofiltration concentrated water contains sodium sulfate and a large amount of organic matters with relatively large molecular weight.
The sodium sulfate in the nanofiltration concentrated water can be separated from the nanofiltration concentrated water by a freezing crystallization technology. The freezing crystallization technology is that the nanofiltration concentrated water is cooled to a certain temperature by a freezing method, and because the solubility of the sodium sulfate is high in sensitivity to the temperature, when the temperature is reduced to a proper temperature, the sodium sulfate can be crystallized and separated out, and then the sodium sulfate is separated from the nanofiltration concentrated water. In the specific implementation process, a part of crystallization mother liquor after sodium sulfate is separated out is refluxed and mixed with nanofiltration concentrated water which is not subjected to freezing crystallization; the other part is discharged.
As the nanofiltration concentrated water may contain some organic matters with unobvious solubility along with temperature change, the organic matters can remain in the crystallization mother liquor in the freezing and crystallization process; along with the continuous reflux of the crystallization mother liquor, the crystallization mother liquor is mixed with nanofiltration concentrated water, so that the content of organic matters in the nanofiltration concentrated water to be frozen and crystallized is increased, and when the content of the organic matters is increased to a certain degree, the organic matters are separated out along with sodium sulfate, and the purity of sodium sulfate frozen crystallization salt is influenced finally.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the utility model is to provide a sodium sulfate freezing crystallization system for solve because the backward flow of crystallization mother liquor for treat the organic matter content increase in the nanofiltration concentrated water of freezing crystallization, finally influence the problem of the purity of the frozen crystal salt of sodium sulfate. The specific technical scheme is as follows:
1. a sodium sulfate freezing and crystallizing system comprises a raw material tank, a heat exchanger, a crystallizing tank and a centrifuge which are connected in sequence, wherein an ozone gas distribution pipe is arranged in the raw material tank; the ozone gas distribution pipe is connected with an ozone generator.
In some embodiments of the present invention, the ozone distributing pipe is disposed at the bottom of the raw material tank.
In some embodiments of the present invention, the top of the raw material tank is provided with an ozone outlet;
the ozone outlet is connected with an ozone destruction device.
In some embodiments of the present invention, the water outlet of the raw material tank is communicated with the hot fluid inlet of the heat exchanger through a pipe; a hot fluid outlet of the heat exchanger is communicated with an inlet of the crystallizing tank through a pipeline; the outlet of the crystallizing tank is communicated with the inlet of the centrifuge.
In some embodiments of the present invention, a first pump is provided on the conduit between the head tank and the heat exchanger;
and a second pump is arranged on a pipeline between the crystallizing tank and the centrifuge.
In some embodiments of the present invention, the system further comprises a crystallization mother liquor circulation pipeline; one end of the crystallization mother liquor circulating pipeline is communicated with the raw material tank, and the other end of the crystallization mother liquor circulating pipeline is communicated with the centrifugal machine, so that part of crystallization mother liquor discharged from the centrifugal machine flows back to the raw material tank.
In some embodiments of the present invention, a third pump is disposed on the crystallization mother liquor circulation line.
In some embodiments of the present invention, the heat exchanger is a double pipe heat exchanger.
The embodiment of the utility model provides a sodium sulfate freezing crystallization system, through increase ozone gas distribution pipe in the head tank, it is bigger to utilize the solubility of ozone in microthermal water, utilizes the high-efficient oxidizing ability of ozone, can treat the organic matter of the nanofiltration concentrated water of freezing crystallization in the head tank and oxidize and get rid of, has solved the problem that the organic matter influences the purity of the frozen crystal salt of sodium sulfate.
In addition, adopt the utility model provides a sodium sulfate freezing crystallization system can improve the reflux of crystallization mother liquor.
Of course, it is not necessary for any product or method of the invention to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of a sodium sulfate freezing and crystallizing system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, the present invention provides a sodium sulfate freezing and crystallizing system, which may include: a raw material tank 2, a heat exchanger 4, a crystallizing tank 7 and a centrifuge 9 which are connected in sequence;
an ozone gas distribution pipe 13 is arranged in the raw material tank 2; the ozone gas distribution pipe 13 is connected with the ozone generator 12.
In some embodiments of the present invention, the ozone distribution pipe 13 is disposed at the bottom of the raw material tank 2.
In some embodiments of the present invention, the top of the raw material tank 2 is provided with an ozone outlet; the ozone outlet is connected to an ozone destruction device 14. In the specific implementation process, feed tank 2 is seal structure, and the ozone that does not utilize in feed tank 2 enters into ozone destruction device 14 through the ozone export, carries out innocent treatment back, and the row is again discharged.
In a specific implementation process, a water outlet of the raw material tank 2 is communicated with a hot fluid inlet of the heat exchanger 4 through a pipeline; a hot fluid outlet of the heat exchanger 4 is communicated with an inlet of the crystallizing tank 7 through a pipeline; the outlet of the crystallization tank 7 is communicated with the inlet of a centrifuge 9.
In some embodiments of the present invention, a first pump 3 is provided on the pipe between the head tank 2 and the heat exchanger 4;
a second pump 8 is provided on the pipe between the crystallization tank 7 and the centrifuge 9.
In some embodiments of the present invention, a crystallization mother liquor circulation pipeline 10 is further included; one end of the crystallization mother liquor circulation line 10 is communicated with the feed tank 2, and the other end is communicated with the centrifuge 9, so that part of the crystallization mother liquor discharged from the centrifuge 9 is refluxed into the feed tank 2.
In the specific implementation process, the centrifuge 9 is provided with a liquid discharge port and a solid discharge port; after centrifugation, the separated sodium sulfate crystals can be discharged through a solid discharge port; the generated crystallization mother liquor can be discharged out of the centrifuge through a liquid discharge port; the discharged crystallization mother liquor may be partially or entirely returned to the raw material tank 2 through a mother liquor circulation line 10. The crystal mother liquor which is not refluxed can be discharged out of the system.
In some embodiments of the present invention, a third pump 11 is disposed on the crystallization mother liquor circulation line 10.
In some embodiments of the present invention, the heat exchanger 4 is a double pipe heat exchanger. In the specific implementation process, a sodium sulfate solution to be frozen and crystallized, such as a nanofiltration concentrated water pipe layer, and a refrigerant (refrigerant) for cooling the sodium sulfate solution pass through a shell pass; the refrigerant enters from the cold fluid inlet of the heat exchanger 4 and exits from the cold fluid outlet. The sodium sulfate solution enters from the hot fluid inlet of the heat exchanger 4 and exits from the hot fluid outlet.
In some embodiments, the specific application process of the sodium sulfate freezing and crystallizing system provided by the present invention is as follows:
nanofiltration concentrated water containing sodium sulfate is conveyed into a raw material tank 2, ozone is generated by an ozone generator 12 and distributed in the raw material tank 2 through an ozone distribution pipe 13, organic matters in the nanofiltration concentrated water are oxidized and removed through ozone oxidation, and ozone tail gas which is not utilized is discharged into the atmosphere after being treated by an ozone tail gas destruction device 14. The treated concentrated water containing sodium sulfate is conveyed into a heat exchanger 4 through a first pump 3, the temperature of the nanofiltration concentrated water reaches 2-5 ℃ after heat exchange and temperature reduction, then the concentrated water enters a crystallizer 7, sodium sulfate crystals are generated in the crystallizer 7, a solution containing the sodium sulfate crystals is conveyed into a centrifuge 9 through a second pump 8, the sodium sulfate crystals are generated through centrifugal separation, the purity of the sodium sulfate crystals can reach more than 95%, and part or all of crystallization mother liquor generated through centrifugal separation flows back into a raw material tank 2 through a third pump 11 for circular treatment. The crystallization mother liquor can be discharged out periodically according to the requirement.
It should be noted that the sodium sulfate freezing and crystallizing system of the present invention can be realized by adopting the prior art, and the adopted device components, including but not limited to heat exchanger, crystallizing tank, centrifuge and pump, etc.; the utility model discloses the structure to each device part is no longer injectd here.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (8)
1. A sodium sulfate freezing and crystallizing system comprises a raw material tank, a heat exchanger, a crystallizing tank and a centrifuge which are connected in sequence, and is characterized in that,
an ozone gas distribution pipe is arranged in the raw material tank; the ozone gas distribution pipe is connected with an ozone generator.
2. The sodium sulfate freezing and crystallizing system of claim 1, wherein the ozone distribution pipe is disposed at the bottom inside the raw material tank.
3. The sodium sulfate freezing and crystallizing system of claim 1 or 2, wherein the top of the raw material tank is provided with an ozone outlet;
the ozone outlet is connected with an ozone destruction device.
4. The sodium sulfate freezing and crystallizing system of claim 1 or 2, wherein a water outlet of the feed tank is communicated with a hot fluid inlet of the heat exchanger through a pipeline; a hot fluid outlet of the heat exchanger is communicated with an inlet of the crystallizing tank through a pipeline; the outlet of the crystallizing tank is communicated with the inlet of the centrifuge.
5. The sodium sulfate freezing and crystallizing system of claim 4 wherein a first pump is provided on the conduit between the feed tank and the heat exchanger;
and a second pump is arranged on a pipeline between the crystallizing tank and the centrifuge.
6. The sodium sulfate freezing and crystallizing system of claim 4, further comprising a crystallization mother liquor circulating line; one end of the crystallization mother liquor circulating pipeline is communicated with the raw material tank, and the other end of the crystallization mother liquor circulating pipeline is communicated with the centrifugal machine, so that part of crystallization mother liquor discharged from the centrifugal machine flows back to the raw material tank.
7. The sodium sulfate freezing and crystallizing system of claim 6, wherein a third pump is provided on the crystallization mother liquor circulating line.
8. The sodium sulfate freezing crystallization system of claim 1 or 2 wherein the heat exchanger is a double pipe heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920292913.3U CN210583737U (en) | 2019-03-08 | 2019-03-08 | Sodium sulfate freezing crystallization system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920292913.3U CN210583737U (en) | 2019-03-08 | 2019-03-08 | Sodium sulfate freezing crystallization system |
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| CN210583737U true CN210583737U (en) | 2020-05-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114210087A (en) * | 2021-12-13 | 2022-03-22 | 江西赣锋锂业股份有限公司 | Non-medium freezing crystallization system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114210087A (en) * | 2021-12-13 | 2022-03-22 | 江西赣锋锂业股份有限公司 | Non-medium freezing crystallization system |
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