CN112811441A - Process and system for producing refined salt by using salt production waste liquid - Google Patents
Process and system for producing refined salt by using salt production waste liquid Download PDFInfo
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- CN112811441A CN112811441A CN202011519443.3A CN202011519443A CN112811441A CN 112811441 A CN112811441 A CN 112811441A CN 202011519443 A CN202011519443 A CN 202011519443A CN 112811441 A CN112811441 A CN 112811441A
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- 150000003839 salts Chemical class 0.000 title claims abstract description 166
- 239000007788 liquid Substances 0.000 title claims abstract description 79
- 239000002699 waste material Substances 0.000 title claims abstract description 77
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000002002 slurry Substances 0.000 claims abstract description 31
- 238000001035 drying Methods 0.000 claims abstract description 23
- 238000001704 evaporation Methods 0.000 claims abstract description 20
- 238000001816 cooling Methods 0.000 claims abstract description 19
- 238000001914 filtration Methods 0.000 claims abstract description 16
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical class O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims abstract description 15
- 230000008719 thickening Effects 0.000 claims abstract description 14
- 230000008020 evaporation Effects 0.000 claims abstract description 13
- 239000012452 mother liquor Substances 0.000 claims abstract description 11
- 239000012267 brine Substances 0.000 claims abstract description 10
- 239000012528 membrane Substances 0.000 claims abstract description 10
- 238000003860 storage Methods 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 238000005406 washing Methods 0.000 claims abstract description 8
- 238000010992 reflux Methods 0.000 claims description 4
- 238000005054 agglomeration Methods 0.000 abstract description 3
- 230000002776 aggregation Effects 0.000 abstract description 3
- 238000002360 preparation method Methods 0.000 description 10
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
- 230000008021 deposition Effects 0.000 description 4
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 239000011780 sodium chloride Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- ZFXVRMSLJDYJCH-UHFFFAOYSA-N calcium magnesium Chemical compound [Mg].[Ca] ZFXVRMSLJDYJCH-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910001425 magnesium ion Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000005119 centrifugation Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000013386 optimize process Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/04—Chlorides
- C01D3/06—Preparation by working up brines; seawater or spent lyes
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention relates to the technical field of salt production, in particular to a process for producing refined salt by using salt production waste liquid, which comprises the following steps: (1) filtering and preheating: filtering the salt production waste liquid by using a semipermeable membrane, and then preheating the salt production waste liquid by using a preheater to obtain primary waste liquid; (2) and (3) evaporation thickening: heating and evaporating the primary waste liquid to generate secondary waste liquid with the concentration of 32-35 degrees Be'; (3) cooling and crystallizing: cooling the secondary waste liquid, and filtering to remove the secondary waste liquid to obtain crystallized salt slurry; (4) washing and dewatering: the crystallized salt slurry enters a salt washer to be washed by saturated brine, the washed crystallized salt slurry enters a salt storage bin, then enters a centrifuge through a swirler to be dehydrated to form wet salt, and brine mother liquor removed by the centrifuge flows back to the salt washer; (5) and (5) drying. The invention avoids the phenomena of blockage and refined salt agglomeration in the salt production process by optimizing the process, thereby ensuring the continuity and stability of the salt production.
Description
Technical Field
The invention relates to the technical field of salt production, in particular to a process and a system for producing refined salt by using salt production waste liquid.
Background
Salts are parent to the chemical industry and have a wide range of uses. In the production process of salt, a large amount of salt-making waste liquid is generated, the concentration of the salt-making waste liquid is about 27 degrees Be', the salt-making waste liquid contains a large amount of salt, and the direct discharge can cause environmental pollution, so that the salt-making waste liquid needs to Be comprehensively utilized, and the resource utilization rate is improved. Based on this, patent ZL200710057195.3 discloses a preparation process for producing refined salt by using salt-making waste liquid as raw material, which comprises the following steps: evaporating and concentrating, thickening mother liquor, recovering bitter salt, washing and dehydrating, drying and packaging; the advanced vacuum salt making technology and salt washing technology are adopted to produce high-quality industrial salt, so that the yield and the quality of the industrial salt are improved; however, the process has high labor intensity and low preparation rate of the crystallized salt slurry, so the patent application with the application number of 201810462404.0 is improved on the basis, and provides a preparation process for producing refined salt by taking the salt-making waste liquid as a raw material, which comprises the following steps: semi-permeable filtering, evaporating for thickening, cooling for crystallization, collecting crystals, washing for dehydration, drying and packaging; the invention utilizes the semipermeable membrane to prepare the primary liquid, reduces the labor intensity of workers, and carries out cooling crystallization after evaporation and thickening, thereby quickening the speed of generating the crystallized salt slurry and improving the preparation efficiency of the crystallized salt slurry. However, the process has the following problems after practical popularization and application: firstly, the centrifugal drying process is easy to block, so that salt discharge cannot be continuous, and energy consumption is increased; secondly, the drying is not thorough, and the produced salt is easy to agglomerate.
Disclosure of Invention
Aiming at the problems of easy blockage and easy caking of the obtained salt in the conventional process for producing the refined salt by using the salt production waste liquid, the invention provides the process and the system for producing the refined salt by using the salt production waste liquid, and through the optimization process, the blockage and the caking of the refined salt in the salt production process are avoided, so that the continuity and the stability of the salt production are ensured, and the preparation efficiency is improved.
The invention provides a process for producing refined salt by using salt production waste liquid, which comprises the following steps:
(1) filtering and preheating: filtering the salt making waste liquid by utilizing a semipermeable membrane, increasing the concentration of the salt making waste liquid, and then preheating the salt making waste liquid in a preheater to obtain primary waste liquid;
(2) and (3) evaporation thickening: heating and evaporating the primary waste liquid to generate secondary waste liquid with the concentration of 32-35 degrees Be';
(3) cooling and crystallizing: cooling the secondary waste liquid to generate crystallized salt slurry and secondary waste liquid, and filtering to remove the secondary waste liquid to obtain crystallized salt slurry;
(4) washing and dewatering: the crystallized salt slurry enters a salt washer to be washed by saturated brine, the washed crystallized salt slurry enters a salt storage bin, then enters a centrifuge through a swirler to be dehydrated to form wet salt, and brine mother liquor removed by the centrifuge flows back to the salt washer;
(5) and (3) drying: and (4) drying the wet salt obtained in the step (4) to obtain refined salt.
Wherein,
the concentration of the salt production waste liquid filtered in the step (1) is not less than 28 degrees Be', which is beneficial to subsequent evaporation and thickening.
In the step (1), the preheating temperature is 70-80 ℃, and the preheating time is 15-30 min. Preheating is carried out before evaporation thickening, so that energy consumption can be reduced, and the evaporation thickening effect can be improved.
The heating temperature in the step (2) is 110-115 ℃, and the evaporation time is 30-60 min. Under the heating evaporation condition, the content of precipitated NaCl is the largest.
And (4) cooling to 25-30 ℃ in the step (3), wherein the cooling time is 60-90 min. The cooling crystallization is carried out, the speed of generating the crystallized salt slurry can be accelerated, and the preparation efficiency of the crystallized salt slurry is improved.
The rotating speed of the cyclone in the step (4) is 1500-. The solid-liquid ratio is controlled, and the thickening and uniform feeding of the salt slurry are realized.
The reflux ratio in the step (4) is 1: 7-11. A flow of brine mother liquor is introduced into the downstream of the centrifugal machine and is merged into the salt washer, so that the flow rate in a slurry pipeline is kept reasonable, and crystal deposition and blockage are avoided.
And (5) the drying equipment is a vibrating fluidized bed dryer. The hot air passes through the wet salt for drying, so that the caking phenomenon in the drying process can be prevented, and the drying efficiency is improved.
The invention also aims to provide a system for producing refined salt by using the salt production waste liquid, which comprises a semipermeable membrane, a preheater, an evaporator, a cooling device, a salt washer, a salt storage bin, a cyclone, a centrifuge and a drying device which are sequentially connected, wherein an outlet of the centrifuge is connected with the salt washer through a return pipeline.
The beneficial effect of the invention is that,
(1) the salt production waste liquid is preheated by the preheater and then evaporated and thickened, so that the energy consumption can be reduced, and the evaporation and thickening effects can be improved; the concentration of the secondary waste liquid is maintained to Be 32-35 DEG Be', the preparation efficiency of the crystallized salt slurry is low if the concentration is too low, and the system is easy to Be unstable if the concentration is too high; the washed crystallized salt slurry is not guided into a settler for thickening, but enters a salt storage bin, and can be temporarily stored if the later centrifugation and other processes have faults such as blockage, so that the continuous and stable production process is ensured; brine mother liquor removed by the centrifuge is refluxed to the salt washer to maintain the reasonable flow velocity in the slurry pipeline, so that the deposition and blockage of crystals are avoided;
(2) according to the process and the system for producing the refined salt by using the salt production waste liquid, provided by the invention, through an optimized process, the phenomena of blockage and refined salt agglomeration in the salt production process are avoided, the continuity and stability of the salt production are further ensured, and the preparation efficiency is indirectly improved.
Drawings
FIG. 1 is a schematic diagram of a system for producing refined salt by using a salt production waste liquid provided by the invention;
in the figure, 1, a semipermeable membrane; 2. a preheater; 3. an evaporator; 4. a cooling device; 5. a salt washer; 6. a salt storage bin; 7. a swirler; 8. a centrifuge; 9. a return line; 10. and (7) a drying device.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The system provided by the invention is adopted in the following embodiment for producing refined salt, the system comprises a semipermeable membrane 1, a preheater 2, an evaporator 3, a cooling device 4, a salt washer 5, a salt storage bin 6, a cyclone 7, a centrifuge 8 and a drying device 10 which are connected in sequence, and an outlet of the centrifuge 8 is connected with the salt washer 10 through a return pipeline 9; wherein the drying device 10 is a vibrating fluidized bed dryer, and the rest devices are conventional, for example, the salt washer can be a multi-stage horizontal salt washer.
Example 1
Salt-making waste liquid is collected from a salt-making area I of a salt-making field of the company, and the sampling analysis results are shown in the table 1:
TABLE 1 chemical composition of the salt waste liquid collected from the salt production zone of this company
A process for producing refined salt by using salt-making waste liquid comprises the following steps:
(1) filtering and preheating: filtering the salt making waste liquid by using a semipermeable membrane, increasing the concentration of the salt making waste liquid to Be not less than 28-degree Be', and then preheating the salt making waste liquid in a preheater, wherein the preheating temperature is 80 ℃, and the preheating time is 15min, so as to obtain primary waste liquid;
(2) and (3) evaporation thickening: heating the primary waste liquid to 110 ℃ and evaporating for 60min to generate secondary waste liquid with the concentration of 35 DEG Be';
(3) cooling and crystallizing: cooling the secondary waste liquid to 30 ℃ for 75 min; generating crystallized salt slurry and secondary waste liquid, and filtering to remove the secondary waste liquid to obtain crystallized salt slurry;
(4) washing and dewatering: the crystallized salt slurry enters a salt washer to be washed by saturated brine, the washed crystallized salt slurry enters a salt storage bin, then enters a centrifuge through a swirler (the rotating speed of the swirler is 2000r/min) to be dehydrated to form wet salt, and brine mother liquor removed by the centrifuge flows back to the salt washer; wherein the reflux ratio is 1:7, and a strand of brine mother liquor is introduced into the downstream of the centrifuge and is merged into the salt washer, so that the flow rate in the slurry pipeline is kept reasonable, and the deposition and blockage of crystals are avoided.
(5) And (3) drying: and (4) drying the wet salt obtained in the step (4) in a vibrating fluidized bed dryer to obtain refined salt.
By the process provided by the embodiment 1, after the system runs for a period of time in summer, the system has no blocking phenomenon, the salt production process is continuous and stable, and the preparation efficiency is indirectly improved; the obtained refined salt has no caking and high quality, and can reach the standard value in the industrial salt standard, and the data is shown in Table 2:
table 2 quality standards of the refined salt
| Index name | Quality standard |
| Sodium chloride | ≥99.1％ |
| Calcium magnesium ion | ＜0.5％ |
| Sulfate ion | ＜0.5％ |
| Moisture content | ＜0.5％ |
Example 2
Salt-making waste liquid is collected from a salt-making four-zone of a salt-making field of the company, and the sampling analysis results are shown in a table 3:
TABLE 3 chemical composition of salt waste liquid collected from four regions of salt production of this company
A process for producing refined salt by using salt-making waste liquid comprises the following steps:
(1) filtering and preheating: filtering the salt making waste liquid by using a semipermeable membrane, increasing the concentration of the salt making waste liquid to Be not less than 28-degree Be', and then preheating the salt making waste liquid in a preheater, wherein the preheating temperature is 70 ℃, and the preheating time is 30min, so as to obtain primary waste liquid;
(2) and (3) evaporation thickening: heating the primary waste liquid to 113 ℃ and evaporating for 45min to generate secondary waste liquid with the concentration of 32-degree Be';
(3) cooling and crystallizing: cooling the secondary waste liquid to 25 ℃ for 60 min; generating crystallized salt slurry and secondary waste liquid, and filtering to remove the secondary waste liquid to obtain crystallized salt slurry;
(4) washing and dewatering: the crystallized salt slurry enters a salt washer to be washed by saturated brine, the washed crystallized salt slurry enters a salt storage bin, then enters a centrifuge through a swirler (the rotating speed of the swirler is 1500r/min) to be dehydrated to form wet salt, and brine mother liquor removed by the centrifuge flows back to the salt washer; wherein the reflux ratio is 1:11, and a strand of brine mother liquor is introduced into the downstream of the centrifuge and is merged into the salt washer, so that the flow rate in the slurry pipeline is kept reasonable, and the deposition and blockage of crystals are avoided.
(5) And (3) drying: and (4) drying the wet salt obtained in the step (4) in a vibrating fluidized bed dryer to obtain refined salt.
By utilizing the process provided by the embodiment 2, after the system runs for a period of time in winter, the system has no blocking phenomenon, the salt production process is continuous and stable, and the preparation efficiency is indirectly improved; the obtained refined salt has no caking and high quality, and can reach the standard value in the industrial salt standard, and the data is shown in Table 4:
table 4 quality standards of the refined salt
| Index name | Quality standard |
| Sodium chloride | ≥99.1％ |
| Calcium magnesium ion | ＜0.5％ |
| Sulfate ion | ＜0.5％ |
| Moisture content | ＜0.5％ |
Comparative example 1
The difference from the embodiment 1 is that brine mother liquor which is not removed by a centrifuge flows back to a salt scrubber process, and after a period of operation, an upstream pipeline of the centrifuge is blocked.
Comparative example 2
The difference from example 1 is that the concentration of the secondary waste liquid in step (2) is 43 Be', the rotating speed of the cyclone is 800r/min, the system has no blockage phenomenon, but the obtained refined salt has a little agglomeration.
Although the present invention has been described in detail by way of preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A process for producing refined salt by using salt production waste liquid is characterized by comprising the following steps:
(1) filtering and preheating: filtering the salt making waste liquid by utilizing a semipermeable membrane, increasing the concentration of the salt making waste liquid, and then preheating the salt making waste liquid in a preheater to obtain primary waste liquid;
(2) and (3) evaporation thickening: heating and evaporating the primary waste liquid to generate secondary waste liquid with the concentration of 32-35 degrees Be';
(3) cooling and crystallizing: cooling the secondary waste liquid to generate crystallized salt slurry and secondary waste liquid, and filtering to remove the secondary waste liquid to obtain crystallized salt slurry;
(4) washing and dewatering: the crystallized salt slurry enters a salt washer to be washed by saturated brine, the washed crystallized salt slurry enters a salt storage bin, then enters a centrifuge through a swirler to be dehydrated to form wet salt, and brine mother liquor removed by the centrifuge flows back to the salt washer;
(5) and (3) drying: and (4) drying the wet salt obtained in the step (4) to obtain refined salt.
2. The process for producing refined salt by using the waste liquid from salt production as claimed in claim 1, wherein the preheating temperature in the step (1) is 70-80 ℃ and the preheating time is 15-30 min.
3. The process for producing refined salt by using the waste liquid from salt production as claimed in claim 1, wherein the heating temperature in the step (2) is 110-115 ℃, and the evaporation time is 30-60 min.
4. The process for producing refined salt by using the waste liquid of salt production as claimed in claim 1, wherein the temperature in the step (3) is reduced to 25-30 ℃ for 60-90 min.
5. The process for producing refined salt by using the waste liquid of salt production as claimed in claim 1, wherein the rotational speed of the cyclone in the step (4) is 1500-.
6. The process for producing refined salt by using the waste liquid from salt production as claimed in claim 1, wherein the reflux ratio in the step (4) is 1: 7-11.
7. The process for producing refined salt using the waste liquid from salt production as claimed in claim 1, wherein the drying device in the step (5) is a vibrating fluidized bed dryer.
8. A system for producing refined salt by using salt manufacturing waste liquid as claimed in any one of claims 1-7, characterized by comprising a semipermeable membrane (1), a preheater (2), an evaporator (3), a cooling device (4), a salt washer (5), a salt storage bin (6), a cyclone (7), a centrifuge (8) and a drying device (10) which are connected in sequence, wherein the outlet of the centrifuge (8) is connected with the salt washer (10) through a return pipeline (9).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113461031A (en) * | 2021-05-29 | 2021-10-01 | 湖南省湘衡盐化有限责任公司 | Scattered wet salt production, storage and transportation system and dry salt and scattered wet salt combined production, storage and transportation system |
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| CN208493309U (en) * | 2018-07-31 | 2019-02-15 | 沈明强 | A kind of evaporation crystallization equipment for salt manufacturing |
| CN208667365U (en) * | 2018-05-30 | 2019-03-29 | 海洲环保集团有限公司 | A kind of energy conservation solventing-out evaporated crystallization device |
-
2020
- 2020-12-21 CN CN202011519443.3A patent/CN112811441B/en active Active
Patent Citations (6)
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|---|---|---|---|---|
| US20030143152A1 (en) * | 2002-01-31 | 2003-07-31 | Vohra Rajinder Nath | Process for recovery of low sodium salt from bittern |
| CN104030327A (en) * | 2014-02-27 | 2014-09-10 | 青海西部镁业有限公司 | Method of continuous dissolution of salt lake bischofite to prepare high-concentration magnesium chloride solution |
| CN104047009A (en) * | 2014-06-28 | 2014-09-17 | 南通久信石墨科技开发有限公司 | Recovery process device of ferrous chloride in steel pickling liquid |
| CN108584986A (en) * | 2018-05-15 | 2018-09-28 | 新疆盐湖制盐有限责任公司 | A kind of preparation process producing purified salt using salt-manufacturing waste liquor as raw material |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113461031A (en) * | 2021-05-29 | 2021-10-01 | 湖南省湘衡盐化有限责任公司 | Scattered wet salt production, storage and transportation system and dry salt and scattered wet salt combined production, storage and transportation system |
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