CN108719933B - Method for preparing edible low-sodium salt - Google Patents
Method for preparing edible low-sodium salt Download PDFInfo
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- CN108719933B CN108719933B CN201810788245.3A CN201810788245A CN108719933B CN 108719933 B CN108719933 B CN 108719933B CN 201810788245 A CN201810788245 A CN 201810788245A CN 108719933 B CN108719933 B CN 108719933B
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- low
- sodium salt
- sodium
- carnallite
- mother liquor
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- 238000000034 method Methods 0.000 title claims abstract description 44
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims abstract description 139
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 107
- 239000001103 potassium chloride Substances 0.000 claims abstract description 64
- 235000011164 potassium chloride Nutrition 0.000 claims abstract description 64
- 159000000000 sodium salts Chemical class 0.000 claims abstract description 62
- 239000011780 sodium chloride Substances 0.000 claims abstract description 53
- 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 claims abstract description 51
- 239000012267 brine Substances 0.000 claims abstract description 48
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims abstract description 48
- 239000011734 sodium Substances 0.000 claims abstract description 47
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 45
- 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 abstract description 41
- 239000012452 mother liquor Substances 0.000 claims abstract description 40
- 239000012535 impurity Substances 0.000 claims abstract description 17
- 239000007790 solid phase Substances 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 238000007670 refining Methods 0.000 claims abstract description 8
- 239000007791 liquid phase Substances 0.000 claims abstract description 6
- 238000000354 decomposition reaction Methods 0.000 claims description 48
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 36
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 18
- 239000007787 solid Substances 0.000 claims description 16
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 claims description 10
- 229910001425 magnesium ion Inorganic materials 0.000 claims description 9
- 229910001385 heavy metal Inorganic materials 0.000 claims description 6
- BITYAPCSNKJESK-UHFFFAOYSA-N potassiosodium Chemical compound [Na].[K] BITYAPCSNKJESK-UHFFFAOYSA-N 0.000 claims description 6
- 150000002500 ions Chemical class 0.000 claims description 5
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims description 4
- -1 ammonium ions Chemical class 0.000 claims description 4
- 229910001424 calcium ion Inorganic materials 0.000 claims description 4
- 238000001179 sorption measurement Methods 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- 238000004064 recycling Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 15
- 238000010587 phase diagram Methods 0.000 abstract description 10
- 150000003839 salts Chemical class 0.000 description 15
- 229910052925 anhydrite Inorganic materials 0.000 description 14
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 10
- 239000002994 raw material Substances 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 239000011777 magnesium Substances 0.000 description 8
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 7
- 229910052749 magnesium Inorganic materials 0.000 description 7
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 5
- 239000011575 calcium Substances 0.000 description 5
- 229910052791 calcium Inorganic materials 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 238000001704 evaporation Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 1
- 241001122767 Theaceae Species 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005695 dehalogenation reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- 159000000003 magnesium salts Chemical class 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 229940072033 potash Drugs 0.000 description 1
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 description 1
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 1
- 235000015320 potassium carbonate Nutrition 0.000 description 1
- 229940034483 potassium chloride / sodium chloride Drugs 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000005185 salting out Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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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
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23V—INDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
- A23V2002/00—Food compositions, function of food ingredients or processes for food or foodstuffs
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- Health & Medical Sciences (AREA)
- Nutrition Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Polymers & Plastics (AREA)
- Seasonings (AREA)
Abstract
A method for preparing edible low sodium salt, the first step S1, decompose the carnallite containing sodium with the original brine, make sodium chloride and potassium chloride supersaturate and separate out, get the solid phase as the first low sodium salt, the liquid phase is decomposing the mother liquor; a second step S2 of blending the first low sodium salt to obtain a second low sodium salt; and a third step S3, removing impurities from the second low-sodium salt, and refining to obtain refined mother liquor and edible low-sodium salt. The method utilizes the phase diagram principle of a quaternary water-salt system to analyze and determine the proportion of the original brine to the sodium-containing carnallite, decomposes the sodium-containing carnallite, and has no strict requirement on the components of the original brine. And the method has the advantages of short process flow, low production cost and no generation of three wastes, and meets the requirement of green production. The edible low-sodium salt produced by the method has larger adjustable range of components, can produce edible low-sodium salts with different proportions, and is suitable for different requirements.
Description
Technical Field
The invention relates to the field of low-sodium salt production, in particular to the field of preparing edible low-sodium salt by using salt lake resources.
Background
The low sodium salt is a "healthy salt" which contains a certain amount of potassium chloride and magnesium sulfate and is capable of improving sodium (Na) in human body+) Potassium (K)+) Magnesium (Mg)2+) The balance state of the health-care tea has a vital effect on improving the health of human bodies.
At present, the existing production method of low sodium salt generally adopts a direct mixing method, namely edible sodium chloride, edible potassium salt, magnesium salt and other raw materials are mixed uniformly according to a scientific proportion by adopting a certain process.
The method has the advantages of long process and high cost. The salt lake is rich in sylvine ore (mixture of potassium chloride, sodium chloride and magnesium chloride), raw brine and sun-cured sodium-containing carnallite ore are used as raw materials, the content of each component of the system is adjusted through the processes of dissolving, removing magnesium, dehalogenation, impurity removal and the like, and a natural evaporation process of a salt pan is adopted, so that the green pollution-free high-quality low-sodium salt raw material sylvine ore can be obtained, wherein NaCl and KCl accord with the specific composition proportion of low-sodium salt.
The prior patent CN106858521A discloses a preparation method of low sodium salt, which is to mix potassium-containing mineral and initial brine for blending, and further perform natural evaporation to obtain low sodium salt and second brine. The method has high requirements on the initial brine components, the natural evaporation mostly needs long time, and impurities such as calcium, magnesium, ammonium and the like in the low-sodium salt cannot be removed. The mass percentage of the low sodium salt KCl obtained by the method is 14.00-35.00 percent, and the method is not suitable for the component requirements of local standards of low sodium salt at home and abroad.
Disclosure of Invention
The invention aims to provide a method for preparing an edible low-sodium salt product by using raw halogen and carnallite which are self-produced resources of salt lakes as raw materials, and the purposes of low production cost, short process flow and simple process are achieved.
The invention provides a method for preparing edible low-sodium salt, which comprises the following steps: a first step S1, decomposing sodium-containing carnallite by using original brine to make sodium chloride and potassium chloride supersaturated and separated out to obtain a solid phase of first low sodium salt and a liquid phase of decomposed mother liquor; a second step S2 of blending the first low sodium salt to obtain a second low sodium salt; and a third step S3, removing impurities from the second low-sodium salt, and refining to obtain refined mother liquor and edible low-sodium salt.
According to one embodiment of the invention, the sodium-potassium ratio of the first low-sodium salt is prepared by adjusting the ratio of the original brine to the sodium-containing carnallite, controlling the decomposition degree of the sodium-containing carnallite.
According to one embodiment of the invention, the first low sodium salt is further formulated with sodium potassium ratio by adding potassium chloride or/and sodium chloride.
According to one embodiment of the invention, the impurity removal and purification is carried out by removing calcium ions, magnesium ions, ammonium ions and heavy metal ions by using alkaline porous inert solid as a filter aid and removing organic matters by physical adsorption.
According to an embodiment of the present invention, the decomposition mother liquor is subjected to sun-curing to obtain carnallite or sylvine solid, which is recycled.
According to one embodiment of the invention, the refined mother liquor is subjected to solid-liquid separation and sun-drying to obtain carnallite or sylvine solid which is recycled.
According to an embodiment of the invention, the raw brine has a mass percentage of KCl of 1.30% -4.00% and a mass percentage of NaCl of 3.20% -12.00%.
According to one embodiment of the invention, the mass percent of the decomposition mother liquor KCl is 2.30-6.70%, the mass percent of NaCl is 2.00-6.79%, and the mass percent of MgCl2 is 16.0-22.0%.
According to one embodiment of the invention, the mass percent of KCl, NaCl and MgCl in the first low-sodium salt obtained by decomposition is 10.00-30.00%, 60.00-80.00% and the mass percent of NaCl is adjusted by adjusting the decomposition ratio2·6H2The mass percent of O is 6.00-12.00%.
According to one embodiment of the invention, the second low-sodium salt with KCl of 30.00-50.00% by mass is obtained by adding potassium chloride or/and sodium chloride to the first low-sodium salt.
The invention utilizes the phase diagram principle of a quaternary water salt system, analyzes and determines the decomposition ratio according to the conditions of different components in the original brine, and then decomposes the sodium-containing carnallite by adjusting the ratio of the original brine to the sodium-containing carnallite, so that the method has no strict requirement on the components of the original brine. The method has the advantages of short process flow, low production cost and no generation of three wastes, and meets the requirement of green production. The method adopts a two-stage method for preparing the ratio of sodium chloride to potassium chloride, the first stage is the adjustment of the ratio of the original brine to the sodium-containing carnallite, the second stage is the addition of potassium chloride and/or sodium chloride to the first low sodium salt, and the two-stage adjustment ensures that the adjustable range of the components of the edible low sodium salt produced by the method is large, and the edible low sodium salt with different ratios can be produced to adapt to different requirements.
Drawings
FIG. 1 is a schematic representation of the steps of the process of the present invention; and
FIG. 2 is a schematic flow chart of the production process of the method of the invention.
Detailed Description
In the following detailed description of the preferred embodiments of the invention, reference is made to the accompanying drawings that form a part hereof, and in which is shown by way of illustration, specific features of the invention, such that the advantages and features of the invention may be more readily understood and appreciated. The following description is an embodiment of the claimed invention, and other embodiments related to the claims not specifically described also fall within the scope of the claims.
Figure 1 shows the steps for obtaining edible low sodium salt.
As shown in fig. 1, a method for preparing edible low-sodium salt comprises the following steps: a first step S1, decomposing sodium-containing carnallite by using original brine to make sodium chloride and potassium chloride supersaturated and separated out to obtain a solid phase of first low sodium salt and a liquid phase of decomposed mother liquor; a second step S2 of blending the first low sodium salt to obtain a second low sodium salt; and a third step S3, removing impurities from the second low-sodium salt, and refining to obtain refined mother liquor and edible low-sodium salt.
The original brine is salt lake original brine, and can be unsaturated magnesium chloride and saturated sodium chloride brine. The invention does not limit the specific component percentage of the original brine, and utilizes the phase diagram principle of a quaternary water-salt system to analyze and determine the decomposition ratio according to the conditions of different components in the original brine, and then decomposes the sodium-containing carnallite by adjusting the ratio of the original brine to the sodium-containing carnallite, so that the method has no strict requirement on the components of the original brine.
The sodium-containing carnallite is mineral obtained by evaporating, concentrating and crystallizing brine in a salt lake, and the carnallite in the salt pan mainly contains potassium chloride, magnesium chloride and crystal water and also contains a certain amount of sodium chloride. The invention does not limit the content of each component in the sodium-containing carnallite, and the invention utilizes the phase diagram principle of a quaternary water salt system to determine the decomposition ratio of the original brine to the sodium-containing carnallite according to the requirement of the potassium chloride component in the required low sodium salt.
The blending of the first low sodium salt in the second step S2 means that the ratio of the components of sodium chloride and potassium chloride in the first low sodium salt is adjusted, and the components of the first low sodium salt are adjusted by increasing sodium chloride or increasing potassium chloride.
According to one embodiment of the invention, the sodium-potassium ratio of the first low-sodium salt is prepared by adjusting the ratio of the original brine to the sodium-containing carnallite to control the decomposition degree of the sodium-containing carnallite.
The original brine is used to dissolve all or most of the magnesium chloride in the sodium-containing carnallite, so that the content of the magnesium chloride in the liquid phase is increased. In addition, due to the salting out effect, part of the sodium chloride and potassium chloride is precipitated out to obtain a solid phase, i.e., the first low sodium salt, of which sodium chloride and potassium chloride are predominant.
FIG. 2 shows a schematic flow chart of the production process of the method of the invention.
As shown in FIG. 2, taking the self-produced brine and sodium-containing carnallite of the Qinghai Kerr salt lake as examples, the original brine has the mass percent of KCl of 1.30-4.00% and NaCl of 3.20-12.00%. Decomposing sodium-containing carnallite by using original brine according to a proportion to obtain crude low sodium salt (namely first low sodium salt) and decomposition mother liquor; the mass percent of KCl in the crude low-sodium salt is between 10.00 and 30.00 percent, the mass percent of NaCl is between 60.00 and 80.00 percent, and MgCl is adopted2·6H2The mass percent of O is 6.00-12.00%, and a small amount of CaSO4。
The low sodium salt component of the low sodium salt light industry ministry standard (QB 2019-2005) has no fixed value, the standard components of the low sodium salt are different at home and abroad, and the mass percent of KCl can be from 14.00 to 50.00 percent
And (2) carrying out solid-liquid separation on the decomposed product, wherein the solid phase is crude low sodium salt (namely the first low sodium salt), the liquid phase is decomposed mother liquor, the mass percent of KCl in the decomposed mother liquor is 2.30-6.70%, the mass percent of NaCl is 2.00-6.79%, and the mass percent of MgCl2 is 16.0-22.0%, discharging the decomposed mother liquor into a salt pan for sun curing, and obtaining carnallite or sylvine solid which can also be used as a raw material for producing potassium chloride.
According to one embodiment of the invention, the first low sodium salt is further formulated with sodium potassium ratio by adding potassium chloride or/and sodium chloride.
The sodium-potassium ratio of the desired low sodium salt, if not met by adjusting the degree of decomposition alone, can be achieved by adding potassium chloride or/and sodium chloride. Namely, the first low sodium salt is proportioned to obtain the second low sodium salt. The added potassium chloride/sodium chloride comes from the salt lake self-production, and the production cost is not increased.
According to one embodiment of the invention, the impurity removal and purification is carried out by removing calcium ions, magnesium ions, ammonium ions and heavy metal ions by using alkaline porous inert solid as a filter aid and removing organic matters by physical adsorption.
The second low-sodium salt obtained by the above method cannot be directly used for food grade, and the salt lake contains many impurities such as Ca2+、Mg2+Heavy metals, organic matters and the like, and can reach food-grade low-sodium salt through impurity removal and refining. The invention can adopt alkaline porous inert solid as filter aid, and also can adopt other corresponding impurity removal reagents to remove impurities.
The invention adopts alkaline porous inert solid as filter aid, removes calcium, magnesium, ammonium and heavy metal ions, and simultaneously can remove organic matters through physical adsorption. In addition, when the alkaline solid reacts with calcium, magnesium and heavy metal ions in the solution, precipitates are formed in the pore passages or in the vicinity of filter aid particles, so that the solid also has the function of assisting filtration.
The filter residue after impurity removal and filtration is a filter aid containing calcium and magnesium precipitates and organic matters, wherein calcium and magnesium and partial organic matters can be removed through hydrochloric acid washing, and partial organic matters can be removed through potash washing while the filter aid is regenerated, so that the filter aid can be recycled. The use of the filter aid can shorten the process flow, the liquid material consumption, the material conveying energy consumption and the like, does not introduce additional impurities, can be regenerated and recycled, and has a simple regeneration method.
According to one embodiment of the invention, the decomposition mother liquor is subjected to sun curing to obtain carnallite or sylvine solid which is recycled.
And discharging refined mother liquor obtained by removing impurities and refining the second low-sodium salt into a salt pan for sun curing to obtain carnallite or sylvine solid, wherein the carnallite or sylvine solid can also be used as a production raw material of potassium chloride.
The contents of the present invention will now be described by taking the brine and sodium-containing carnallite produced by the Qinghai Kao' er salt lake.
According to one embodiment of the invention, the original brine has a mass percent of KCl of 1.30-4.00% and a mass percent of NaCl of 3.20-12.00%.
By using Na+、K+、Mg2+//Cl--H2According to the O quaternary water salt system phase diagram principle, the decomposition proportion is analyzed and determined according to the components in the original brine, and then the sodium-containing carnallite is decomposed by adjusting the proportion of the original brine to the sodium-containing carnallite, so that the following results are obtained:
according to one embodiment of the invention, the mass percent of KCl, NaCl and MgCl2 in the decomposition mother liquor is 2.30-6.70%, 2.00-6.79% and 16.0-22.0%.
According to one embodiment of the present invention, by adjusting the decomposition ratio, the mass percentage of KCl, the mass percentage of NaCl, and the mass percentage of MgCl in the first low sodium salt obtained by decomposition are 10.00% to 30.00%, 60.00% to 80.00%, and 60.00%, respectively2·6H2The mass percent of O is 6.00-12.00%.
Further, by adding potassium chloride to the first low sodium salt, the following results were obtained:
according to one embodiment of the invention, the second low-sodium salt with KCl of 30.00-50.00% by mass is obtained by adding potassium chloride or/and sodium chloride to the first low-sodium salt.
And removing impurities from the second low-sodium salt, and refining to obtain edible low-sodium salt and refined mother liquor.
Discharging the decomposed mother liquor and the refined mother liquor into a salt pan for sun curing, and recycling to realize a green and environment-friendly production process.
Examples
The following is a specific example of obtaining crude low sodium salts of different compositions by controlling the decomposition degree of sodium-containing carnallite by adjusting the decomposition ratio.
Example 1
In example 1, MgCl in sodium-containing carnallite was added2Completely dissolving, controlling the mass percent of KCl in the crude low-sodium salt to be about 20%, passing through Na+、K+、Mg2+//Cl--H2After the equilibrium phase diagram analysis of the O quaternary water salt system, 15% of the decomposition proportion is selected for decomposition, namely, the initial brine and the sodium-containing carnallite are decomposed according to the ratio of 3.15:1 to obtain crude low sodium salt (namely, first low sodium salt) and decomposition mother liquor, and the specific components are as follows:
wherein table 1 is the initial brine component, table 2 is the sodium-containing carnallite component, table 3 is the component of the decomposition mother liquor after the initial brine and sodium-containing carnallite are decomposed in the decomposition ratio of 3.15:1, and table 4 is the component of crude low sodium salt (i.e., first low sodium salt).
Table 1:
| components | KCl | NaCl | MgCl2 | CaSO4 | H2O |
| Mass percent | 1.87 | 8.24 | 16.01 | 0.10 | 73.76 |
Table 2:
| components | KCl | NaCl | MgCl2 | CaSO4 | H2O |
| Mass percent | 18.94 | 23.47 | 25.65 | 0.75 | 31.19 |
Table 3:
| components | KCl | NaCl | MgCl2 | CaSO4 | H2O |
| Mass percent | 4.22 | 3.89 | 16.61 | 0.08 | 75.20 |
Table 4:
the solid-phase crude low-sodium salt entrainment mother liquor obtained after decomposition is 27.49%, and after the entrainment mother liquor is converted, KCl, NaCl and MgCl are contained in the low-sodium salt2Will be increasedKCl 23.06 wt%, NaCl 68.68 wt%, and MgCl2Is 6.68 percent by mass, CaSO4Is 1.59 percent by mass.
Example 2
The raw material composition used in example 2 was the same as that used in example 1, and the decomposition ratio was controlled to about 20% by mass of KCl in the crude low-sodium salt (first low-sodium salt) by passing Na+、K+、Mg2+//Cl--H2And (3) analyzing an equilibrium phase diagram of an O quaternary water salt system, selecting a decomposition ratio of 3:1 for decomposition, wherein the decomposed mother liquor and crude low sodium salt (first low sodium salt) comprise the following components:
wherein, Table 5 shows the components of the decomposition mother liquor after the decomposition of the initial brine and the sodium-containing carnallite in the decomposition ratio of 3:1, and Table 6 shows the components of the decomposed crude low sodium salt (first low sodium salt).
Table 5:
| components | KCl | NaCl | MgCl2 | CaSO4 | H2O |
| Mass percent | 4.39 | 5.79 | 18.17 | 0.05 | 71.60 |
Table 6:
| components | KCl | NaCl | MgCl2 | CaSO4 | H2O |
| Mass percent | 17.90 | 59.73 | 4.58 | 1.46 | 16.33 |
The solid-phase crude low-sodium salt entrainment mother liquor obtained after decomposition is 16.33 percent, and after the entrainment mother liquor is converted, KCl, NaCl and MgCl are contained in the low-sodium salt2The mass percent of (A) is improved, the mass percent of KCl is 21.08%, the mass percent of NaCl is 68.71%, and MgCl is adopted28.55 percent by mass, CaSO4Is 1.66 percent.
Example 3
In example 3The raw material components used are consistent with those of example 1, and the decomposition ratio is to control the mass percent of KCl in the crude low-sodium salt to be about 25 percent through Na+、K+、Mg2+//Cl--H2Analyzing an equilibrium phase diagram of an O quaternary water salt system, selecting the decomposition ratio of original brine to sodium-containing carnallite as 1:1, and obtaining decomposition mother liquor and crude low sodium salt (first low sodium salt) after decomposition, wherein the specific components are as follows:
table 7 shows the components of the decomposed mother liquor after the initial brine and the sodium-containing carnallite were decomposed at a decomposition ratio of 1:1, and table 8 shows the components of the decomposed crude low sodium salt (first low sodium salt).
Table 7:
| components | KCl | NaCl | MgCl2 | CaSO4 | H2O |
| Mass percent | 3.67 | 3.53 | 21.93 | 0.09 | 70.78 |
Table 8:
| components | KCl | NaCl | MgCl2 | CaSO4 | H2O |
| Mass percent | 22.44 | 57.93 | 7.76 | 1.30 | 10.57 |
The solid-phase crude low-sodium salt entrainment mother liquor obtained after decomposition is 10.57 percent, and after the entrainment mother liquor is converted, KCl, NaCl and MgCl are contained in the low-sodium salt2The mass percent of the sodium chloride is improved, the mass percent of KCl is 24.69 percent, the mass percent of NaCl is 63.08 percent, and MgCl is added2Is 10.81 percent, CaSO4Is 1.41 percent by mass.
Example 4
The raw material composition used in example 4 was the same as that used in example 1, and the decomposition ratio was controlled so that the KCl content in the crude low-sodium salt was about 27% by mass and Na was passed+、K+、Mg2+//Cl--H2The equilibrium phase diagram analysis of the O quaternary water salt system,the method comprises the following steps of selecting original brine and sodium-containing carnallite with a decomposition ratio of 0.82:1, and obtaining decomposition mother liquor and crude low sodium salt (first low sodium salt) after decomposition, wherein the specific components are as follows:
wherein, table 9 is the components of the decomposed mother liquor after the initial brine and the sodium-containing carnallite were decomposed in the decomposition ratio of 0.82:1, and table 10 is the components of the decomposed crude low sodium salt (first low sodium salt).
Table 9:
| components | KCl | NaCl | MgCl2 | CaSO4 | H2O |
| Mass percent | 3.34 | 3.00 | 22.49 | 0.07 | 71.1 |
Table 10:
| components | KCl | NaCl | MgCl2 | CaSO4 | H2O |
| Mass percent | 24.31 | 55.87 | 7.95 | 1.32 | 10.55 |
The solid-phase crude low-sodium salt entrainment mother liquor obtained after decomposition is 10.55 percent, and after the entrainment mother liquor is converted, KCl, NaCl and MgCl are contained in the low-sodium salt2The mass percent of (A) is improved, the mass percent of KCl is 26.68%, the mass percent of NaCl is 60.80%, and MgCl is adopted2Is 11.09 percent by mass, CaSO4Is 1.44 percent.
The invention utilizes the phase diagram principle of a quaternary water salt system, analyzes and determines the decomposition ratio according to the conditions of different components in the original brine, and then decomposes the sodium-containing carnallite by adjusting the ratio of the original brine to the sodium-containing carnallite, so that the method has no strict requirement on the components of the original brine. The method has the advantages of short process flow, low production cost and no generation of three wastes, and meets the requirement of green production. The method adopts a two-stage method for preparing the ratio of sodium chloride to potassium chloride, the first stage is the adjustment of the ratio of the original brine to the sodium-containing carnallite, the second stage is the addition of potassium chloride and/or sodium chloride to the first low sodium salt, and the two-stage adjustment ensures that the adjustable range of the components of the edible low sodium salt produced by the method is large, and the edible low sodium salt with different ratios can be produced to adapt to different requirements.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.
Claims (3)
1. A method for preparing edible low-sodium salt comprises the following steps:
the method comprises a first step (S1) of decomposing sodium-containing carnallite by using original brine to make sodium chloride and potassium chloride supersaturated and separated out to obtain a solid phase of a first low sodium salt and a liquid phase of a decomposition mother liquor, controlling the decomposition degree of the sodium-containing carnallite by adjusting the proportion of the original brine to the sodium-containing carnallite, and carrying out sodium-potassium proportion blending on the first low sodium salt, wherein the mass percent of KCl in the first low sodium salt is 10.00-30.00%, the mass percent of NaCl is 60.00-80.00%, and MgCl is added2 •6H2 The mass percent of O is 6.00-12.00%;
a second step (S2) of adding potassium chloride or adding potassium chloride and sodium chloride to the first low-sodium salt and blending the first low-sodium salt to obtain a second low-sodium salt, wherein the mass percent of KCl in the second low-sodium salt is 30.00% -50.00%;
a third step (S3) of removing impurities and refining the second low-sodium salt to obtain refined mother liquor and edible low-sodium salt, wherein the impurities and the refining are to remove calcium ions, magnesium ions, ammonium ions and heavy metal ions by taking alkaline porous inert solid as a filter aid and remove organic matters by physical adsorption;
wherein, the original brine has the mass percent of KCl of 1.30-4.00% and NaCl of 3.20-12.00%;
the mass percentage of the decomposition mother liquor KCl is 2.30-6.70Percent, NaCl of 2.00-6.79 percent by mass and MgCl2 The mass percentage of the component (A) is 16.0-22.0%.
2. The method of claim 1, wherein,
and (3) sun-curing the decomposition mother liquor to obtain carnallite or sylvine solid, and recycling the carnallite or sylvine solid.
3. The method of claim 1, wherein the refined mother liquor is subjected to solid-liquid separation and sun-drying to obtain carnallite or sylvine solids, which are recycled.
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