CN112624156A - Process for producing high-purity green low-sodium salt by using sodium chloride solution and low-grade potassium chloride solution - Google Patents
Process for producing high-purity green low-sodium salt by using sodium chloride solution and low-grade potassium chloride solution Download PDFInfo
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- CN112624156A CN112624156A CN202011470622.2A CN202011470622A CN112624156A CN 112624156 A CN112624156 A CN 112624156A CN 202011470622 A CN202011470622 A CN 202011470622A CN 112624156 A CN112624156 A CN 112624156A
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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
- C01D3/14—Purification
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L27/00—Spices; Flavouring agents or condiments; Artificial sweetening agents; Table salts; Dietetic salt substitutes; Preparation or treatment thereof
- A23L27/40—Table salts; Dietetic salt substitutes
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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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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/80—Particles consisting of a mixture of two or more inorganic phases
- C01P2004/82—Particles consisting of a mixture of two or more inorganic phases two phases having the same anion, e.g. both oxidic phases
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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Abstract
A process for producing high-purity green low-sodium salt by using a sodium chloride solution and a low-grade potassium chloride solution comprises the following steps: taking a potassium chloride solution formed by adding water into a sodium chloride solution and low-grade potassium chloride as raw materials, adding halogen in a controlled proportion, adding caustic soda or lime and soda ash for double decomposition reaction at the reaction temperature of 20-70 ℃ for 0.2-4 hours, removing calcium and magnesium impurities to obtain a refined raw material solution, and evaporating the refined raw material solution at the high temperature of 45-150 ℃ to separate out a high-purity low-sodium salt product. The invention relates to a process for producing high-purity green low-sodium salt by using a sodium chloride solution and a low-grade potassium chloride solution, which has the characteristics that the theoretical recovery rate of the sodium chloride and the potassium chloride is 100%, the product quality is high, stable and defective products do not exist, the energy consumption and the cost are low, no waste liquid is discharged, and the like.
Description
Technical Field
The invention belongs to the technical field of inorganic chemical industry, and particularly relates to a process for producing high-purity green low-sodium salt by using a sodium chloride solution and a low-grade potassium chloride solution.
Background
The known method for producing the low sodium salt comprises a solid sodium chloride and potassium chloride mixing method, but the method has the problems that high-grade sodium chloride and high-grade potassium chloride are required to be used as raw materials, the price and the cost of the raw materials are high, the low sodium salt product is easy to produce nonuniform mixing and the quality of the product is influenced, and the like.
Disclosure of Invention
The invention aims to provide a process for producing high-purity green low-sodium salt by using a sodium chloride solution and a low-grade potassium chloride solution, which has the characteristics of high and stable product quality, no defective product, low energy consumption and cost, no waste liquid discharge and the like, and the theoretical recovery rate of the sodium chloride and the potassium chloride is 100%.
In order to achieve the purpose, the invention adopts the following technical scheme:
a process for producing high-purity green low-sodium salt by using a sodium chloride solution and a low-grade potassium chloride solution comprises the following steps: taking a potassium chloride solution formed by adding water into a sodium chloride solution and low-grade potassium chloride as raw materials, adding halogen in a controlled proportion, adding caustic soda or lime and soda ash for double decomposition reaction at the reaction temperature of 20-70 ℃ for 0.2-4 hours, removing calcium and magnesium impurities to obtain a refined raw material solution, and evaporating the refined raw material solution at the high temperature of 45-150 ℃ to separate out a high-purity low-sodium salt product.
Further, the sodium chloride solution comprises the following components in percentage by weight: NaCl 50-320g/l, MgCl2 0.01-500g/l、MgSO4 0.01-300g/l、CaSO4 0.01-8.0g/l。
Further, the low-grade potassium chloride comprises the following components in parts by weight: KCl 1-98.5%, MgCl20.01-90％、MgSO4 0.01-90％、CaSO40.01-10%, wherein the potassium chloride solution comprises the following components in percentage by weight: KCl 36-355g/l, MgCl2 0.04-324g/l、MgSO4 0.04-324g/l、CaSO4 0.04-6.0g/l。
Further, the proportion of the controlled proportion of the brine is as follows: NaCl: KCl is 75 +/-10: 25 +/-10.
Further, the low sodium salt product comprises the following components in parts by weight: 75 +/-10% of NaCl and 25 +/-10% of KCl.
Further, the sodium chloride solution also contains potassium chloride. An alternative to the sodium chloride solution may also be a high purity refined sodium chloride solution. The alternative to the low-grade potassium chloride solution may also be a high-purity refined potassium chloride solution.
The invention has the beneficial effects that: the invention relates to a process for producing high-purity green low-sodium salt by using a sodium chloride solution and a low-grade potassium chloride solution, which has the characteristics that the theoretical recovery rate of the sodium chloride and the potassium chloride is 100%, the product quality is high, stable and defective products do not exist, the energy consumption and the cost are low, no waste liquid is discharged, and the like.
Drawings
FIG. 1 is a schematic diagram of the process flow of the present invention for producing high purity green low sodium salt from sodium chloride solution and low grade potassium chloride solution.
Detailed Description
As shown in figure 1, the invention provides a process for producing high-purity green low-sodium salt by using a sodium chloride solution and a low-grade potassium chloride solution, which comprises the following steps: taking a potassium chloride solution formed by adding water into a sodium chloride solution and low-grade potassium chloride as raw materials, adding halogen in a controlled proportion, adding caustic soda or lime and soda ash for double decomposition reaction, removing calcium and magnesium impurities to obtain a refined raw material solution, and evaporating the refined raw material solution at a high temperature to separate out a high-purity low-sodium salt product.
The present invention will be described in detail below with reference to specific examples.
Example 1: take 2.50m3Sodium chloride solution (NaCl 300g/l, MgCl)2 0.5g/l、MgSO4 0.2g/l、CaSO45.0g/l), 0.27 ton low grade potassium chloride (containing KCl 92.59%, MgCl2 2％、MgSO4 0.1％、CaSO40.5%) with 0.74 ton of water 0.83m3The resulting potassium chloride solution (containing KCl 300g/l, MgCl)2 7.2g/l、MgSO4 3.6g/l、CaSO41.8g/l) as raw material, and adding brine (controlling NaCl: KCl 75:25), adding caustic soda and soda for double decomposition reaction (reaction temperature 30 ℃ and reaction time 1 hour) to remove calcium and magnesium impurities to obtain 3.33m3Refined stock solution (NaCl 225g/l, KCl 75g/l) 3.33m31 ton of high-purity low-sodium salt (NaCl 75 percent and KCl 25 percent) product is evaporated and separated out from refined raw material liquid (NaCl 225g/l and KCl 75g/l) at high temperature (100 ℃).
Example 2: take 2.17m3Sodium chloride solution (NaCl 300g/l, MgCl)2 0.5g/l、MgSO4 0.2g/l、CaSO45.0g/l), 0.38 ton low grade potassium chloride (containing KCl 92.59%, MgCl2 2％、MgSO4 0.1％、CaSO40.5%) was added 1.03 ton of water 1.16m3The resulting potassium chloride solution (containing KCl 300g/l, MgCl)2 7.2g/l、MgSO4 3.6g/l、CaSO41.8g/l) as raw material, and adding brine (controlling NaCl: KCl 65:35), adding caustic soda and soda for double decomposition reaction (reaction temperature 30 ℃ and reaction time 1 hour) to remove calcium and magnesium impurities to obtain 3.33m3Refined stock solution (NaCl 195g/l, KCl 105g/l) 3.33m31 ton of high-purity low-sodium salt (NaCl 65 percent and KCl 35 percent) product is evaporated and separated out from refined raw material liquid (NaCl 195g/l and KCl 105g/l) at high temperature (110 ℃).
Example 3: take 2.84m3Sodium chloride solution (NaCl 300g/l, MgCl)2 0.5g/l、MgSO4 0.2g/l、CaSO45.0g/l), 0.16 ton low grade potassium chloride (containing KCl 92.59%, MgCl2 2％、MgSO4 0.1％、CaSO40.5%) with 0.44 ton water 0.49m3The resulting potassium chloride solution (containing KCl 300g/l, MgCl)2 7.2g/l、MgSO4 3.6g/l、CaSO41.8g/l) as raw material, and adding brine (controlling NaCl: KCl 85:15), adding caustic soda and soda for double decomposition reaction (reaction temperature 30 ℃ and reaction time 1 hour) to remove calcium and magnesium impurities to obtain 3.33m3Refined stock solution (NaCl 255g/l, KCl 45g/l) 3.33m31 ton of high-purity low-sodium salt (NaCl 85 percent and KCl 15 percent) product is evaporated and separated out from refined raw material liquid (NaCl 255g/l and KCl 45g/l) at high temperature (120 ℃).
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the structure of the present invention in any way. Any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.
Claims (6)
1. A process for producing high-purity green low-sodium salt by using a sodium chloride solution and a low-grade potassium chloride solution is characterized by comprising the following steps: taking a potassium chloride solution formed by adding water into a sodium chloride solution and low-grade potassium chloride as raw materials, adding halogen in a controlled proportion, adding caustic soda or lime and soda ash for double decomposition reaction at the reaction temperature of 20-70 ℃ for 0.2-4 hours, removing calcium and magnesium impurities to obtain a refined raw material solution, and evaporating the refined raw material solution at the high temperature of 45-150 ℃ to separate out a high-purity low-sodium salt product.
2. The process for producing high-purity green low-sodium salt with sodium chloride solution and low-grade potassium chloride solution according to claim 1, characterized in that: the sodium chloride solution comprises the following components in percentage by weight: NaCl 50-320g/l, MgCl2 0.01-500g/l、MgSO4 0.01-300g/l、CaSO4 0.01-8.0g/l。
3. The process for producing high-purity green low-sodium salt with sodium chloride solution and low-grade potassium chloride solution according to claim 1, characterized in that: the low-grade potassium chloride comprises the following components in parts by weight: KCl 1-98.5%, MgCl2 0.01-90％、MgSO4 0.01-90％、CaSO40.01-10%, wherein the potassium chloride solution comprises the following components in percentage by weight: KCl 36-355g/l, MgCl2 0.04-324g/l、MgSO4 0.04-324g/l、CaSO4 0.04-6.0g/l。
4. The process for producing high-purity green low-sodium salt with sodium chloride solution and low-grade potassium chloride solution according to claim 1, characterized in that: the proportion of the brine blending in the control proportion is as follows: NaCl: KCl is 75 +/-10: 25 +/-10.
5. The process for producing high-purity green low-sodium salt with sodium chloride solution and low-grade potassium chloride solution according to claim 1, characterized in that: the low sodium salt product comprises the following components in parts by weight: 75 +/-10% of NaCl and 25 +/-10% of KCl.
6. The process for producing high-purity green low-sodium salt with sodium chloride solution and low-grade potassium chloride solution according to claim 1, characterized in that: the sodium chloride solution also contains potassium chloride.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1617834A (en) * | 2002-01-31 | 2005-05-18 | 科学和工业研究委员会 | Process for recovering low sodium salt from bittern |
| US20080220127A1 (en) * | 2007-03-07 | 2008-09-11 | Juan Antonio Flores Zuniga | Low sodium salt compositions and methods of preparation and uses thereof |
| CN102009987A (en) * | 2010-12-02 | 2011-04-13 | 河南神马氯碱化工股份有限公司 | Brine refining process for removing calcium and magnesium by one step |
| CN103570043A (en) * | 2013-11-21 | 2014-02-12 | 浙江大洋生物科技集团股份有限公司 | Method for producing high-purity potassium chloride solution for preparation of potassium carbonate and co-producing low sodium salt |
| CN106858521A (en) * | 2017-02-27 | 2017-06-20 | 中国科学院青海盐湖研究所 | The preparation method of Cardia Salt |
-
2020
- 2020-12-15 CN CN202011470622.2A patent/CN112624156A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1617834A (en) * | 2002-01-31 | 2005-05-18 | 科学和工业研究委员会 | Process for recovering low sodium salt from bittern |
| US20080220127A1 (en) * | 2007-03-07 | 2008-09-11 | Juan Antonio Flores Zuniga | Low sodium salt compositions and methods of preparation and uses thereof |
| CN102009987A (en) * | 2010-12-02 | 2011-04-13 | 河南神马氯碱化工股份有限公司 | Brine refining process for removing calcium and magnesium by one step |
| CN103570043A (en) * | 2013-11-21 | 2014-02-12 | 浙江大洋生物科技集团股份有限公司 | Method for producing high-purity potassium chloride solution for preparation of potassium carbonate and co-producing low sodium salt |
| CN106858521A (en) * | 2017-02-27 | 2017-06-20 | 中国科学院青海盐湖研究所 | The preparation method of Cardia Salt |
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Application publication date: 20210409 |