CN114735722A - Potassium-rich low-sodium salt recycling process - Google Patents
Potassium-rich low-sodium salt recycling process Download PDFInfo
- Publication number
- CN114735722A CN114735722A CN202210235503.1A CN202210235503A CN114735722A CN 114735722 A CN114735722 A CN 114735722A CN 202210235503 A CN202210235503 A CN 202210235503A CN 114735722 A CN114735722 A CN 114735722A
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- CN
- China
- Prior art keywords
- potassium
- sodium
- evaporation
- chloride
- separated out
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 37
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 229910052700 potassium Inorganic materials 0.000 title claims abstract description 30
- 239000011591 potassium Substances 0.000 title claims abstract description 30
- 238000004064 recycling Methods 0.000 title claims abstract description 9
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims abstract description 52
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 42
- 238000001704 evaporation Methods 0.000 claims abstract description 34
- 230000008020 evaporation Effects 0.000 claims abstract description 34
- 235000011164 potassium chloride Nutrition 0.000 claims abstract description 26
- 239000001103 potassium chloride Substances 0.000 claims abstract description 26
- 238000000605 extraction Methods 0.000 claims abstract description 25
- 239000011780 sodium chloride Substances 0.000 claims abstract description 21
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 20
- 239000011734 sodium Substances 0.000 claims abstract description 20
- 238000000926 separation method Methods 0.000 claims abstract description 17
- 239000012452 mother liquor Substances 0.000 claims abstract description 15
- 238000002425 crystallisation Methods 0.000 claims abstract description 14
- 230000008025 crystallization Effects 0.000 claims abstract description 14
- 238000001816 cooling Methods 0.000 claims abstract description 11
- BITYAPCSNKJESK-UHFFFAOYSA-N potassiosodium Chemical compound [Na].[K] BITYAPCSNKJESK-UHFFFAOYSA-N 0.000 claims abstract description 11
- 150000003839 salts Chemical class 0.000 claims abstract description 9
- 238000005119 centrifugation Methods 0.000 claims abstract description 8
- 238000005406 washing Methods 0.000 claims abstract description 7
- 239000013078 crystal Substances 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims abstract description 4
- 238000010992 reflux Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 14
- 230000000694 effects Effects 0.000 claims description 7
- 239000013072 incoming material Substances 0.000 claims description 6
- -1 salt ions Chemical class 0.000 claims description 3
- 238000002207 thermal evaporation Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 238000007670 refining Methods 0.000 abstract description 2
- 239000010881 fly ash Substances 0.000 description 5
- 239000002956 ash Substances 0.000 description 3
- 239000006227 byproduct Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- C01D3/14—Purification
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a recycling process of potassium-rich low-sodium salt, which comprises the following steps: (1) the potassium-rich low-sodium material obtained through water washing and pretreatment firstly enters a hot method primary potassium chloride extraction section, and a large amount of potassium chloride is separated out through evaporation and crystallization; (2) the mother liquor obtained by centrifugation enters a cooling deep potassium chloride extraction section, and a small amount of potassium chloride is further separated out through cooling crystallization; (3) the mother liquor obtained by centrifugation enters a thermal sodium chloride extraction working section, and sodium chloride is separated out through evaporation and crystallization; (4) and (4) circularly refluxing the mother liquor after the sodium chloride is separated out to the foremost end, and obtaining potassium chloride and sodium chloride crystal salt. The invention provides a recycling process of potassium-rich low-sodium salt, which adopts cooling crystallization as the critical control of potassium-sodium salt separation, and converts the control of components of a salt separation system into the control of temperature. Can reduce the treatment capacity of the evaporation refining system and the control difficulty.
Description
Technical Field
The invention belongs to the technical field of salt separation industry, and particularly relates to a potassium-rich low-sodium salt separation recycling process.
Background
The potassium-sodium salt separation becomes an explosion process in the salt separation industry, and particularly shows explosion-type emergence in the synergistic treatment of a garbage fly ash cement kiln. The national controls on harmlessness, resource utilization and the like of the steel industry, and the first ash of the sintering machine also has urgent needs of potassium and sodium salt separation.
The compositions of the sintering machine head ash and the garbage fly ash are just opposite: the waste fly ash washing solution has more sodium and less potassium, and most of the waste fly ash washing solution adopts the processes of thermal sodium chloride separation and cooling potassium chloride separation to realize the sodium-potassium salt separation; the sodium in the washing solution of the sintering machine head ash is less and more potassium is more, and qualified by-products of sodium chloride and potassium chloride cannot be obtained by imitating the potassium-sodium salt separation process of the garbage fly ash.
Disclosure of Invention
In view of the above-mentioned deficiencies of the prior art, the present invention aims to: the potassium-rich low-sodium salt-separation recycling process is provided, potassium-rich low-sodium salt-separation of potassium can be realized, and qualified by-products of sodium chloride and potassium chloride can be obtained.
A process for recycling potassium-rich low-sodium salt, which comprises the following steps,
(1) the potassium-rich and low-sodium material obtained through water washing and pretreatment firstly enters a hot method primary potassium chloride extraction section, and a large amount of potassium chloride is separated out through evaporation and crystallization;
(2) the mother liquor obtained by centrifugation enters a cooling deep potassium chloride extraction section, and a small amount of potassium chloride is further separated out through cooling crystallization;
(3) the mother liquor obtained by centrifugation enters a thermal sodium chloride extraction working section, and sodium chloride is separated out through evaporation and crystallization;
(4) and (4) circularly refluxing the mother liquor after the sodium chloride is separated out to the foremost end, so that the large circulation of the system is realized, and the potassium chloride and the sodium chloride crystal salt are obtained.
Preferably, in the step (4), as the enrichment of other miscellaneous salt ions influences the purity of the potassium sodium salt, part of sodium evaporation mother liquor is discharged periodically as required along with the continuous enrichment of evaporation.
Preferably, the related thermal evaporation systems are all energy-saving evaporation processes.
Preferably, the energy efficient evaporation process is multiple effect evaporation, TVR evaporation or MVR evaporation.
Preferably, the two sets of evaporation systems for potassium primary extraction and sodium primary extraction by a thermal method are a set of multi-effect coupled system.
Preferably, the multi-effect coupling system uses part of the effect bodies in the multi-effect system for primary potassium extraction by a thermal method and the other part of the effect bodies for sodium extraction by the thermal method according to the component conditions of the incoming material, and the distribution mode needs to be matched according to the potassium-sodium ratio condition of the incoming material.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention develops 'first potassium chloride extraction by a hot method + cooling deep potassium chloride extraction by a hot method + sodium chloride extraction by a hot method', can realize the salt separation of potassium and sodium rich in potassium and low in sodium, and can obtain qualified by-products of sodium chloride and potassium chloride;
2. the temperature reduction crystallization is adopted as the critical control of the potassium-sodium salt separation, the control of the components of the salt separation system is converted into the control of the temperature, and the treatment capacity and the control difficulty of an evaporation refining system can be reduced.
Detailed Description
The present invention will be described in detail with reference to examples.
Examples
A process for recycling potassium-rich low-sodium salt, which comprises the following steps,
(1) the potassium-rich low-sodium material obtained through water washing and pretreatment firstly enters a hot method primary potassium chloride extraction section, and a large amount of potassium chloride is separated out through evaporation and crystallization;
(2) the mother liquor obtained by centrifugation enters a cooling deep potassium chloride extraction section, and a small amount of potassium chloride is further separated out through cooling crystallization;
(3) the mother liquor obtained by centrifugation enters a thermal sodium chloride extraction working section, and sodium chloride is separated out through evaporation and crystallization;
(4) and (4) circularly refluxing the mother liquor after the sodium chloride is separated out to the foremost end, so that the large circulation of the system is realized, and the potassium chloride and the sodium chloride crystal salt are obtained.
Wherein, in the step (4), as the enrichment of other miscellaneous salt ions can influence the purity of the potassium sodium salt, the enrichment is continuously carried out along with the evaporation, and partial sodium evaporation mother liquor is discharged periodically as required.
Wherein, the related thermal evaporation systems are all energy-saving evaporation processes.
Wherein, the energy-saving evaporation process is multi-effect evaporation, TVR evaporation or MVR evaporation.
Wherein, two sets of evaporation systems for potassium primary extraction and sodium primary extraction by a thermal method are a set of multi-effect coupling system.
The multi-effect coupling system is characterized in that part of effect bodies in the multi-effect system are used for initially extracting potassium by a thermal method and the other part of effect bodies are used for extracting sodium by the thermal method according to the component conditions of incoming materials, and the distribution mode needs to be matched according to the potassium-sodium ratio conditions of the incoming materials.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. A resource process of potassium-rich low-sodium salt is characterized by comprising the following steps,
(1) the potassium-rich low-sodium material obtained through water washing and pretreatment firstly enters a hot method primary potassium chloride extraction section, and a large amount of potassium chloride is separated out through evaporation and crystallization;
(2) the mother liquor obtained by centrifugation enters a cooling deep potassium chloride extraction section, and a small amount of potassium chloride is further separated out through cooling crystallization;
(3) the mother liquor obtained by centrifugation enters a thermal sodium chloride extraction working section, and sodium chloride is separated out through evaporation and crystallization;
(4) and (4) circularly refluxing the mother liquor after the sodium chloride is separated out to the foremost end, so that the large circulation of the system is realized, and the potassium chloride and the sodium chloride crystal salt are obtained.
2. The resource process of potassium-rich low-sodium salt according to claim 1, characterized in that in step (4), as the enrichment of other miscellaneous salt ions can affect the purity of potassium sodium salt, part of sodium evaporation mother liquor is discharged periodically as required along with the continuous enrichment by evaporation.
3. The resource process of potassium-rich low-sodium salt according to claim 1 or 2, characterized in that the related thermal evaporation systems are energy-saving evaporation processes.
4. The resource process of potassium-rich low-sodium salt according to claim 3, characterized in that the energy-saving evaporation process is multi-effect evaporation, TVR evaporation or MVR evaporation.
5. The process of claim 1, wherein the two sets of evaporation systems for potassium primary extraction and sodium primary extraction by a thermal method and sodium separation by a thermal method are a multi-effect coupled system.
6. The potassium-rich low-sodium salt recycling process according to claim 5, wherein the multi-effect coupled system uses part of the effects in the multi-effect system for the thermal initial extraction of potassium and the other part of the effects for the thermal extraction of sodium according to the composition of the incoming material, and the distribution mode needs to match the potassium-sodium ratio of the incoming material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210235503.1A CN114735722A (en) | 2022-03-11 | 2022-03-11 | Potassium-rich low-sodium salt recycling process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210235503.1A CN114735722A (en) | 2022-03-11 | 2022-03-11 | Potassium-rich low-sodium salt recycling process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114735722A true CN114735722A (en) | 2022-07-12 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210235503.1A Pending CN114735722A (en) | 2022-03-11 | 2022-03-11 | Potassium-rich low-sodium salt recycling process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114735722A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2792270C1 (en) * | 2022-07-21 | 2023-03-21 | Акционерное общество "ВНИИ Галургии" (АО "ВНИИ Галургии") | Method for producing potassium and sodium chlorides from potassium-sodium containing raw materials |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1140039A (en) * | 1979-02-12 | 1983-01-25 | Donald H. Geesen | Process of treating potassium chloride brine by evaporation and crystallization |
| RU2062255C1 (en) * | 1993-09-03 | 1996-06-20 | Акционерное общество "Уралкалий" | Method of potassium and sodium chloride producing |
| CN101108738A (en) * | 2007-06-05 | 2008-01-23 | 云南中寮矿业开发投资有限公司 | Manufacturing technique of potassium muriate heat of evaporation separating cooling crystallization process |
| CN111470519A (en) * | 2020-05-06 | 2020-07-31 | 中国科学院青海盐湖研究所 | Method for preparing potassium chloride by using high-sodium carnallite |
| CN112340753A (en) * | 2020-11-23 | 2021-02-09 | 青海盐湖工业股份有限公司 | Method and system for recovering potassium chloride |
| WO2021223668A1 (en) * | 2020-05-06 | 2021-11-11 | 中国科学院青海盐湖研究所 | Method for using carnallite to prepare potassium chloride |
-
2022
- 2022-03-11 CN CN202210235503.1A patent/CN114735722A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1140039A (en) * | 1979-02-12 | 1983-01-25 | Donald H. Geesen | Process of treating potassium chloride brine by evaporation and crystallization |
| RU2062255C1 (en) * | 1993-09-03 | 1996-06-20 | Акционерное общество "Уралкалий" | Method of potassium and sodium chloride producing |
| CN101108738A (en) * | 2007-06-05 | 2008-01-23 | 云南中寮矿业开发投资有限公司 | Manufacturing technique of potassium muriate heat of evaporation separating cooling crystallization process |
| CN111470519A (en) * | 2020-05-06 | 2020-07-31 | 中国科学院青海盐湖研究所 | Method for preparing potassium chloride by using high-sodium carnallite |
| WO2021223668A1 (en) * | 2020-05-06 | 2021-11-11 | 中国科学院青海盐湖研究所 | Method for using carnallite to prepare potassium chloride |
| CN112340753A (en) * | 2020-11-23 | 2021-02-09 | 青海盐湖工业股份有限公司 | Method and system for recovering potassium chloride |
Non-Patent Citations (2)
| Title |
|---|
| 王建达;李亚斌;谢智勇;: "NaCl-KCl-H_2O溶液蒸发分离工艺分析" * |
| 颜亚盟;任青考;: "氯化钠和氯化钾混合蒸发结晶形态实验研究" * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2792270C1 (en) * | 2022-07-21 | 2023-03-21 | Акционерное общество "ВНИИ Галургии" (АО "ВНИИ Галургии") | Method for producing potassium and sodium chlorides from potassium-sodium containing raw materials |
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Application publication date: 20220712 |
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