CN112174171A - Method for producing carnallite by using salt production waste liquid - Google Patents
Method for producing carnallite by using salt production waste liquid Download PDFInfo
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- CN112174171A CN112174171A CN202011203676.2A CN202011203676A CN112174171A CN 112174171 A CN112174171 A CN 112174171A CN 202011203676 A CN202011203676 A CN 202011203676A CN 112174171 A CN112174171 A CN 112174171A
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- Prior art keywords
- carnallite
- waste liquid
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- chloride
- washing
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- PALNZFJYSCMLBK-UHFFFAOYSA-K magnesium;potassium;trichloride;hexahydrate Chemical compound O.O.O.O.O.O.[Mg+2].[Cl-].[Cl-].[Cl-].[K+] PALNZFJYSCMLBK-UHFFFAOYSA-K 0.000 title claims abstract description 90
- 239000007788 liquid Substances 0.000 title claims abstract description 71
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 56
- 239000002699 waste material Substances 0.000 title claims abstract description 33
- 150000003839 salts Chemical class 0.000 title claims abstract description 31
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims abstract description 80
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 66
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims abstract description 47
- 238000005406 washing Methods 0.000 claims abstract description 42
- 239000001103 potassium chloride Substances 0.000 claims abstract description 40
- 235000011164 potassium chloride Nutrition 0.000 claims abstract description 40
- 239000011780 sodium chloride Substances 0.000 claims abstract description 33
- 239000002994 raw material Substances 0.000 claims abstract description 14
- 229910001629 magnesium chloride Inorganic materials 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims description 53
- 239000000243 solution Substances 0.000 claims description 40
- 238000000926 separation method Methods 0.000 claims description 21
- 239000012267 brine Substances 0.000 claims description 12
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 12
- 239000007790 solid phase Substances 0.000 claims description 10
- 238000000354 decomposition reaction Methods 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 2
- 241001131796 Botaurus stellaris Species 0.000 abstract description 14
- 238000001704 evaporation Methods 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 8
- 239000007791 liquid phase Substances 0.000 description 6
- 239000000047 product Substances 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229910001410 inorganic ion Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
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
- C01D3/06—Preparation by working up brines; seawater or spent lyes
-
- 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
- C01D3/22—Preparation in the form of granules, pieces, or other shaped products
- C01D3/24—Influencing the crystallisation process
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/26—Magnesium halides
- C01F5/30—Chlorides
- C01F5/305—Dehydrating ammonium or alkali magnesium chlorides, e.g. carnalite
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention discloses a method for producing carnallite by using salt production waste liquid, which comprises the following steps: separating sodium chloride; (ii) obtaining carnallite and (iii) decomposing and washing the carnallite. The method takes bittern and anhydrous magnesium chloride as raw materials, utilizes the homoionic effect and the difference of the common saturation points of potassium chloride, magnesium chloride and sodium chloride under different components, adds the anhydrous magnesium chloride into the bittern in two stages to obtain sodium chloride, carnallite and thick bittern, obtains potassium chloride after decomposing and washing the carnallite, and greatly reduces the energy consumption and the cost of products compared with the process for producing the carnallite by adding bittern evaporation method in the industry.
Description
Technical Field
The invention belongs to the field of comprehensive utilization of salt production waste liquid, and particularly relates to a method for producing carnallite by using the salt production waste liquid.
Background
The salt production waste liquid is brine which is a byproduct in salt production from seawater and is commonly called bittern, wherein the bittern contains a large amount of K+、Mg2+、SO4 2-、Cl-Inorganic ions, such as bitter halides, cause environmental pollution and a large amount of K contained therein+、Mg2+、SO4 2-、Cl-The waste of inorganic ion resources, and the effective proposal of treating and recycling bittern by taking bittern as raw materials for producing potassium chloride, magnesium sulfate and the like.
At present, most of salt chemical enterprises in China adopt a mature brine-blending evaporation method to produce carnallite, bitter brine is evaporated and concentrated firstly, sodium chloride is removed after heat preservation and sedimentation, and then the carnallite is obtained through cooling and crystallization. The process consumes a large amount of steam and electricity, has high production cost, and is in a loss state for a long time for enterprises.
Disclosure of Invention
The invention aims to overcome the defect of high energy consumption in the existing process for producing carnallite by adopting a brine-blending evaporation method, and aims to provide a method for producing carnallite by using salt production waste liquid.
The invention is realized by the following technical scheme:
a method for producing carnallite by using salt production waste liquid comprises the following steps:
separating sodium chloride
Slowly adding magnesium chloride into raw material brine to separate out sodium chloride, controlling the baume degree of a reaction finished solution, and performing solid-liquid separation to obtain a solid phase, namely sodium chloride;
(ii) obtaining carnallite
Slowly adding magnesium chloride into the reaction finished liquid in the step (i) to separate out carnallite, controlling the baume degree of the reaction finished liquid, and carrying out solid-liquid separation to obtain a solid phase, namely carnallite;
(iii) carnallite decomposition washing
And (ii) adding the carnallite obtained in the step (ii) into a washing solution, controlling the addition amount of the washing solution, decomposing and washing, and carrying out solid-liquid separation to obtain the potassium chloride.
The magnesium chloride is anhydrous magnesium chloride.
In the technical scheme, the anhydrous magnesium chloride is in a block shape or a powder shape.
In the technical scheme, the raw material brine is a salt-making waste liquid.
In the technical scheme, the content of potassium chloride in the salt production waste liquid is more than 25 g/L.
In the technical scheme, the baume degree of the reaction completion liquid in the step (i) is 32 DEG Be-35.5 DEG Be.
In the above technical solution, the baume degree of the reaction completion solution in the step (ii) is 35.5 ° be-38 ° be.
In the above embodiment, the washing solution in the step (iii) is a potassium chloride solution.
In the technical scheme, the concentration of potassium chloride in the potassium chloride solution is less than or equal to 100 g/L.
In the above technical solution, the amount of the washing solution added in step (ii) is 75mL to 100mL per 100g of carnallite.
The invention has the beneficial effects that:
the invention provides a method for producing carnallite by using salt production waste liquid, which takes bittern and anhydrous magnesium chloride as raw materials, utilizes the homoionic effect and the difference of common saturation points of potassium chloride, magnesium chloride and sodium chloride under different components, adds the anhydrous magnesium chloride into the bittern in two stages to obtain sodium chloride, carnallite and thick bittern, obtains potassium chloride after decomposing and washing the carnallite, and greatly reduces the energy consumption and the cost of products compared with the process for producing the carnallite by a brine-mixing evaporation method in the industry.
Drawings
FIG. 1 is a schematic flow diagram of the process for producing carnallite using waste liquor from salt manufacture in accordance with the present invention.
Detailed Description
In order to make the technical scheme of the invention better understood by those skilled in the art, the technical scheme of the method for producing carnallite by using salt manufacturing waste liquid is further described by the following specific embodiments in combination with the attached drawings of the specification.
As shown in fig. 1, a method for producing carnallite by using salt manufacturing waste liquid comprises the following steps:
separating sodium chloride (first stage reaction)
Slowly adding blocky or powdery anhydrous magnesium chloride into the salt-making waste liquid with the potassium chloride content of more than 25g/L to separate out sodium chloride, controlling the baume degree of the reaction-finished liquid to be between 32 DEG Be and 35.5 DEG Be, carrying out solid-liquid separation, wherein the solid phase is sodium chloride, and the liquid phase is the reaction-finished liquid and enters the second-stage reaction;
(ii) obtaining carnallite (second stage reaction)
Slowly adding the blocky or powdery anhydrous magnesium chloride into the reaction completion liquid in the step (i) to separate out carnallite, controlling the baume degree of the reaction completion liquid to be between 35.5 DEG Be and 38 DEG Be, carrying out solid-liquid separation, wherein the solid phase is carnallite, and the liquid phase is subjected to thick halogen retention treatment;
(iii) carnallite decomposition washing (third stage reaction, carnallite post-treatment)
And (ii) adding the carnallite obtained in the step (ii) into a potassium chloride solution with the concentration of less than or equal to 100g/L, controlling the adding amount of a washing solution to be 75-100 mL per 100g of the carnallite, decomposing, washing, and carrying out solid-liquid separation to obtain the potassium chloride.
Example 1
A method for producing carnallite by using salt production waste liquid comprises the following steps:
separating sodium chloride (first stage reaction)
Slowly adding powdery anhydrous magnesium chloride into 500mL of raw material brine A, after the reaction is finished, keeping the reaction finished solution at 33.4 degrees Be, separating out sodium chloride, and after solid-liquid separation, allowing the liquid phase to enter a second-stage reaction, wherein the solid phase is sodium chloride.
(ii) second stage reaction
Slowly adding the powdery anhydrous magnesium chloride into the first-stage reaction completion liquid, after the reaction is finished, keeping the reaction completion liquid at 36.8 degrees Be, separating out carnallite, and carrying out solid-liquid separation to obtain the carnallite A.
(iii) carnallite decomposition washing (third stage reaction, carnallite post-treatment)
Preparing 70g/l of potassium chloride solution as a washing solution, adding carnallite A into the washing solution, controlling the adding amount of the washing solution to be 75mL, fully decomposing and washing, and carrying out solid-liquid separation to obtain the potassium chloride A.
Example 2
A method for producing carnallite by using salt production waste liquid comprises the following steps:
separating sodium chloride (first stage reaction)
Slowly adding blocky anhydrous magnesium chloride into 500mL of raw material brine B, after the reaction is finished, obtaining a reaction finished solution of 33.5 degrees Be, separating out sodium chloride, and after solid-liquid separation, enabling a liquid phase to enter a second-stage reaction, wherein a solid phase is sodium chloride.
(ii) obtaining carnallite (second stage reaction)
Slowly adding the blocky anhydrous magnesium chloride into the first-stage reaction completion liquid, after the reaction is finished, keeping the reaction completion liquid at 36.5 degrees Be, separating out carnallite, and carrying out solid-liquid separation to obtain carnallite B.
(iii) carnallite decomposition washing (third stage reaction, carnallite post-treatment)
Preparing 75g/l potassium chloride solution as a washing solution, adding carnallite B into the washing solution, controlling the addition of the washing solution to be 56mL, fully decomposing and washing, and carrying out solid-liquid separation to obtain the potassium chloride B.
Example 3
A method for producing carnallite by using salt production waste liquid comprises the following steps:
separating sodium chloride (first stage reaction)
Slowly adding powdery anhydrous magnesium chloride into 5000mL of raw material brine C, after the reaction is finished, keeping the reaction finished solution at 33.5 degrees Be, separating out sodium chloride, after solid-liquid separation, enabling the liquid phase to enter a second-stage reaction, and enabling the solid phase to be sodium chloride.
(ii) obtaining carnallite (second stage reaction)
And slowly adding anhydrous magnesium chloride into the reaction completion liquid of the first stage, after the reaction is finished, keeping the reaction completion liquid at 36.9 degrees Be, separating out carnallite, and carrying out solid-liquid separation to obtain carnallite C.
(iii) carnallite decomposition washing (third stage reaction, carnallite post-treatment)
Preparing 70g/l of potassium chloride solution as a washing solution, adding carnallite C into the washing solution, controlling the addition of 750mL of the washing solution, fully decomposing and washing, and carrying out solid-liquid separation to obtain the potassium chloride C.
Example 4
A method for producing carnallite by using salt production waste liquid comprises the following steps:
separating sodium chloride (first stage reaction)
Slowly adding blocky anhydrous magnesium chloride into 10000mL of raw material brine D, after the reaction is finished, keeping the reaction finished solution at 33.5 DEG Be, separating out sodium chloride, after solid-liquid separation, enabling the liquid phase to enter a second stage reaction, and enabling the solid phase to be sodium chloride.
(ii) obtaining carnallite (second stage reaction)
And slowly adding anhydrous magnesium chloride into the reaction completion liquid of the first stage, after the reaction is finished, keeping the reaction completion liquid at 36 degrees Be, separating out carnallite, and carrying out solid-liquid separation to obtain carnallite D.
(iii) carnallite decomposition washing (third stage reaction, carnallite post-treatment)
Preparing 80g/l potassium chloride solution as a washing solution, adding carnallite D into the washing solution, controlling the addition amount of the washing solution to be 1500mL, fully decomposing and washing, and carrying out solid-liquid separation to obtain potassium chloride D.
The compositions of the raw material brines used in examples 1 to 4 are shown in table 1.
Table 1 analysis of the composition of the raw brine of examples 1 to 4.
| Examples | Baume degree (° bete) | KCl(g/L) | MgCl2(g/L) | MgSO4(g/L) | NaCl(g/L) |
| Bittern A | 30.8 | 47.35 | 232.26 | 44.15 | 61.39 |
| Bittern B | 30.6 | 32.06 | 250.05 | 37.31 | 52.77 |
| Bittern C | 30.6 | 40.03 | 232.81 | 58.38 | 65.31 |
| Bittern D | 31.0 | 39.24 | 231.41 | 51.37 | 58.5 |
The carnallite obtained by adding anhydrous magnesium chloride to the raw material brine with different volumes and components in examples 1 to 4 and controlling the conditions of the first-stage and second-stage reactions was analyzed, and the results are shown in table 2 below.
TABLE 2 carnallite production and compositional analysis obtained in examples 1-4
| Examples | Yield (g) | KCl(％) | MgCl2(％) | MgSO4(％) | NaCl(％) |
| Carnallite A | 86.5 | 21.18 | 31.27 | 0.60 | 9.81 |
| Carnallite B | 62.8 | 20.48 | 30.45 | 0.63 | 10.25 |
| Carnallite C | 870 | 20.09 | 30.00 | 1.15 | 10.36 |
| Carnallite D | 1740 | 18.78 | 29.62 | 1.16 | 10.45 |
As can be seen from the data in Table 2, the carnallite produced by the method of the present invention has high yield and stable quality, and the content of potassium chloride is 18-22%, the content of magnesium chloride is 28-31%, and the content of sodium chloride is 8-11%.
The composition analysis of potassium chloride products obtained by decomposing and washing carnallite obtained in examples 1 to 4 is shown in table 3.
Table 3 composition analysis of potassium chloride products obtained by decomposing and washing carnallite obtained in examples 1 to 4.
| Examples | KCl(％) | MgCl2(％) | MgSO4(％) | NaCl(％) |
| Potassium chloride A | 92.25 | 1.53 | 0.07 | Not detected out |
| Potassium chloride B | 91.75 | 1.66 | 0.07 | Not detected out |
| Potassium chloride C | 90.97 | 1.51 | 0.76 | 1.56 |
| Potassium chloride D | 92.56 | 1.65 | Not detected out | 0.12 |
The data analysis in Table 3 shows that the potassium chloride product produced by the process conditions of the invention has stable quality, and the potassium chloride content is over 90 percent.
The invention provides a method for producing carnallite by using salt production waste liquid, which takes bittern and anhydrous magnesium chloride as raw materials, utilizes the homoionic effect and the difference of common saturation points of potassium chloride, magnesium chloride and sodium chloride under different components, adds the anhydrous magnesium chloride into the bittern in two stages to obtain sodium chloride, carnallite and thick bittern, obtains potassium chloride after decomposing and washing the carnallite, and greatly reduces the energy consumption and the cost of products compared with the process for producing the carnallite by a brine-mixing evaporation method in the industry.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. A method for producing carnallite by using salt production waste liquid is characterized by comprising the following steps: the method comprises the following steps:
separating sodium chloride
Slowly adding magnesium chloride into raw material brine to separate out sodium chloride, controlling the baume degree of a reaction finished solution, and performing solid-liquid separation to obtain a solid phase, namely sodium chloride;
(ii) obtaining carnallite
Slowly adding magnesium chloride into the reaction finished liquid in the step (i) to separate out carnallite, controlling the baume degree of the reaction finished liquid, and carrying out solid-liquid separation to obtain a solid phase, namely carnallite;
(iii) carnallite decomposition washing
And (ii) adding the carnallite obtained in the step (ii) into a washing solution, controlling the addition amount of the washing solution, decomposing and washing, and carrying out solid-liquid separation to obtain the potassium chloride.
2. The method for producing carnallite using salt manufacturing waste liquid according to claim 1, characterized in that: the magnesium chloride is anhydrous magnesium chloride.
3. The method for producing carnallite using salt manufacturing waste liquid according to claim 2, characterized in that: the anhydrous magnesium chloride is in a piece shape or a powder shape.
4. The method for producing carnallite using salt manufacturing waste liquid according to claim 1, characterized in that: the raw material brine is salt-making waste liquid.
5. The method for producing carnallite using salt manufacturing waste liquid according to claim 4, characterized in that: the content of potassium chloride in the salt production waste liquid is more than 25 g/L.
6. The method for producing carnallite using salt manufacturing waste liquid according to claim 1, characterized in that: the baume degree of the reaction completion liquid in the step (i) is 32 DEG Be to 35.5 DEG Be.
7. The method for producing carnallite using salt manufacturing waste liquid according to claim 1, characterized in that: the baume degree of the reaction completion liquid in the step (ii) is 35.5 DEG Be to 38 DEG Be.
8. The method for producing carnallite using salt manufacturing waste liquid according to claim 1, characterized in that: the washing solution in the step (iii) is a potassium chloride solution.
9. The method for producing carnallite using salt manufacturing waste liquid according to claim 8, characterized in that: the concentration of potassium chloride in the potassium chloride solution is less than or equal to 100 g/L.
10. The method for producing carnallite using salt manufacturing waste liquid according to claim 1, characterized in that: and (ii) the addition amount of the washing solution in the step (ii) is 75 mL-100 mL of the washing solution per 100g of the carnallite.
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| CN202011203676.2A CN112174171A (en) | 2020-11-02 | 2020-11-02 | Method for producing carnallite by using salt production waste liquid |
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| Application Number | Priority Date | Filing Date | Title |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114261981A (en) * | 2022-01-06 | 2022-04-01 | 江西思远再生资源有限公司 | Efficient and energy-saving method for preparing magnesium chloride hexahydrate |
| CN114560480A (en) * | 2022-03-01 | 2022-05-31 | 天津长芦海晶集团有限公司 | Multi-element extraction method of bittern after desulfurization by calcium method |
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|---|---|---|---|---|
| CN1275531A (en) * | 2000-06-22 | 2000-12-06 | 宋侑霖 | Method for directly obtaining low-sodium fine carnallitite |
| DE10304315A1 (en) * | 2003-02-04 | 2004-08-12 | Kali-Umwelttechnik Gmbh | Production of carnallite/sodium chloride crystals useful for magnesium production by melt electrolysis comprises two-stage crystallization of carnallite brine with addition of potassium chloride |
| CN101157460A (en) * | 2007-08-28 | 2008-04-09 | 中国科学院青海盐湖研究所 | Method for preparing potassium chloride by employing sulfate type salt lake potassium-containing brine |
| CN101671039A (en) * | 2009-10-08 | 2010-03-17 | 山东海化集团有限公司 | Method for comprehensively recycling salt-manufacturing waste liquor |
| CN102167362A (en) * | 2011-03-22 | 2011-08-31 | 天津长芦汉沽盐场有限责任公司 | Potassium chloride production process for decomposing carnallite with cleaning solution |
| CN102583446A (en) * | 2012-02-13 | 2012-07-18 | 河北工业大学 | Method for preparing potassium chloride through decomposing carnallite by concentrated brine |
-
2020
- 2020-11-02 CN CN202011203676.2A patent/CN112174171A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1275531A (en) * | 2000-06-22 | 2000-12-06 | 宋侑霖 | Method for directly obtaining low-sodium fine carnallitite |
| DE10304315A1 (en) * | 2003-02-04 | 2004-08-12 | Kali-Umwelttechnik Gmbh | Production of carnallite/sodium chloride crystals useful for magnesium production by melt electrolysis comprises two-stage crystallization of carnallite brine with addition of potassium chloride |
| CN101157460A (en) * | 2007-08-28 | 2008-04-09 | 中国科学院青海盐湖研究所 | Method for preparing potassium chloride by employing sulfate type salt lake potassium-containing brine |
| CN101671039A (en) * | 2009-10-08 | 2010-03-17 | 山东海化集团有限公司 | Method for comprehensively recycling salt-manufacturing waste liquor |
| CN102167362A (en) * | 2011-03-22 | 2011-08-31 | 天津长芦汉沽盐场有限责任公司 | Potassium chloride production process for decomposing carnallite with cleaning solution |
| CN102583446A (en) * | 2012-02-13 | 2012-07-18 | 河北工业大学 | Method for preparing potassium chloride through decomposing carnallite by concentrated brine |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114261981A (en) * | 2022-01-06 | 2022-04-01 | 江西思远再生资源有限公司 | Efficient and energy-saving method for preparing magnesium chloride hexahydrate |
| CN114261981B (en) * | 2022-01-06 | 2024-01-16 | 江西思远再生资源有限公司 | Efficient energy-saving method for preparing magnesium chloride hexahydrate |
| CN114560480A (en) * | 2022-03-01 | 2022-05-31 | 天津长芦海晶集团有限公司 | Multi-element extraction method of bittern after desulfurization by calcium method |
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Application publication date: 20210105 |