CN117446830B - Method for preparing high-purity sodium carbonate and ammonium chloride by using sodium chloride waste salt - Google Patents
Method for preparing high-purity sodium carbonate and ammonium chloride by using sodium chloride waste salt Download PDFInfo
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- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 title claims abstract description 307
- 235000019270 ammonium chloride Nutrition 0.000 title claims abstract description 169
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 title claims abstract description 158
- 239000011780 sodium chloride Substances 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 65
- VQBIMXHWYSRDLF-UHFFFAOYSA-M sodium;azane;hydrogen carbonate Chemical compound [NH4+].[Na+].[O-]C([O-])=O VQBIMXHWYSRDLF-UHFFFAOYSA-M 0.000 title claims abstract description 31
- 150000003839 salts Chemical class 0.000 title claims abstract description 28
- 239000002699 waste material Substances 0.000 title claims abstract description 28
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims abstract description 206
- 238000002425 crystallisation Methods 0.000 claims abstract description 129
- 230000008025 crystallization Effects 0.000 claims abstract description 129
- 239000012452 mother liquor Substances 0.000 claims abstract description 112
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims abstract description 103
- 235000017557 sodium bicarbonate Nutrition 0.000 claims abstract description 103
- 238000001816 cooling Methods 0.000 claims abstract description 89
- 238000005185 salting out Methods 0.000 claims abstract description 61
- 239000013078 crystal Substances 0.000 claims abstract description 54
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 47
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 27
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 22
- 238000000926 separation method Methods 0.000 claims description 56
- 239000007788 liquid Substances 0.000 claims description 45
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims description 29
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 claims description 29
- 235000012538 ammonium bicarbonate Nutrition 0.000 claims description 29
- 239000001099 ammonium carbonate Substances 0.000 claims description 29
- 238000004090 dissolution Methods 0.000 claims description 28
- 239000010413 mother solution Substances 0.000 claims description 27
- 238000002156 mixing Methods 0.000 claims description 19
- -1 ammonium ions Chemical class 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 15
- 229910001415 sodium ion Inorganic materials 0.000 claims description 11
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 8
- 239000000460 chlorine Substances 0.000 claims description 8
- 229910052801 chlorine Inorganic materials 0.000 claims description 8
- 239000007791 liquid phase Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000005649 metathesis reaction Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 2
- 238000004062 sedimentation Methods 0.000 claims description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 abstract description 8
- 239000003513 alkali Substances 0.000 abstract description 7
- 239000000126 substance Substances 0.000 abstract description 5
- 239000000047 product Substances 0.000 description 44
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 17
- 230000008901 benefit Effects 0.000 description 9
- 229910021529 ammonia Inorganic materials 0.000 description 8
- 230000007613 environmental effect Effects 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- 238000004821 distillation Methods 0.000 description 6
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 230000035484 reaction time Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 239000004317 sodium nitrate Substances 0.000 description 3
- 235000010344 sodium nitrate Nutrition 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- XTEGARKTQYYJKE-UHFFFAOYSA-M Chlorate Chemical compound [O-]Cl(=O)=O XTEGARKTQYYJKE-UHFFFAOYSA-M 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000009621 Solvay process Methods 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 238000002288 cocrystallisation Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 description 1
- ZKQDCIXGCQPQNV-UHFFFAOYSA-N Calcium hypochlorite Chemical compound [Ca+2].Cl[O-].Cl[O-] ZKQDCIXGCQPQNV-UHFFFAOYSA-N 0.000 description 1
- KEAYESYHFKHZAL-UHFFFAOYSA-N Sodium Chemical compound [Na] KEAYESYHFKHZAL-UHFFFAOYSA-N 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000004176 ammonification Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 239000007844 bleaching agent Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000000975 co-precipitation Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- YPJKMVATUPSWOH-UHFFFAOYSA-N nitrooxidanyl Chemical compound [O][N+]([O-])=O YPJKMVATUPSWOH-UHFFFAOYSA-N 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 235000017550 sodium carbonate Nutrition 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002912 waste gas Substances 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
- C01D7/00—Carbonates of sodium, potassium or alkali metals in general
- C01D7/12—Preparation of carbonates from bicarbonates or bicarbonate-containing product
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/16—Halides of ammonium
- C01C1/164—Ammonium chloride
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D7/00—Carbonates of sodium, potassium or alkali metals in general
- C01D7/02—Preparation by double decomposition
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention provides a method for preparing high-purity sodium carbonate and ammonium chloride by using sodium chloride waste salt, which relates to the technical field of sodium chloride waste salt treatment, wherein sodium chloride is still added into sodium bicarbonate mother liquor obtained after double decomposition reaction for salting-out crystallization, mixed crystals of sodium bicarbonate and ammonium chloride are produced on the premise that bicarbonate is decomposed without other substances, the salting-out crystallization mother liquor is subjected to primary cooling crystallization, and ammonium chloride in the mixed crystals is dissolved by utilizing the primary cooling crystallization mother liquor; the method can prepare high-purity sodium carbonate and ammonium chloride, the purity of the obtained product is high, the total alkali content of the sodium carbonate product is more than 99.0%, the requirements of industrial sodium carbonate II qualified products in GB/T210-2022 are met, the mass percentage of the ammonium chloride product is more than 99%, and the requirements of industrial ammonium chloride qualified products in GB/T2946-2018 are met.
Description
Technical Field
The invention relates to the technical field of sodium chloride waste salt treatment, in particular to a method for preparing high-purity sodium carbonate and ammonium chloride by utilizing sodium chloride waste salt.
Background
The annual output of sodium chloride in China exceeds 5000 ten thousand tons, and the sodium chloride is mainly derived from natural salt lakes, seawater and industrial byproducts. Sodium chloride has wide application in the industries of food, chemical industry, metallurgy, printing and dyeing, medical treatment, ceramics and the like. The chemical industry is one industry with more sodium chloride, and is mainly used for preparing chlorine, hydrogen, hydrochloric acid, sodium hydroxide, chlorate, hypochlorite, bleaching powder, sodium metal, sodium bicarbonate, sodium carbonate, ammonium chloride and the like. With the continuous development of society, various product demands are also increasing significantly, and high-value products prepared by taking sodium chloride as a raw material, particularly sodium carbonate, are receiving more and more attention. The ammonia-soda process and the combined soda process are currently mainstream soda processes, and all take carbon dioxide and ammonia as auxiliary materials to react with sodium chloride, and the whole process needs a large number of ammonia distillation towers, ammonification towers and carbonator towers, so that a large amount of equipment is needed, the energy consumption is high, and pollution waste gas is generated. Sodium chloride, especially industrial by-product waste salt, is in need of a harmless and high-valued utilization way.
Sodium chloride alkali production is considered an effective method, but has some problems. In the traditional sodium chloride alkali preparation method, after sodium bicarbonate is separated by double decomposition reaction, unreacted ammonium bicarbonate in mother liquor is required to be decomposed at high temperature, and then the recovery is realized by matching with the procedures of ammoniation, carbonation and the like. The whole process flow is complex, a large amount of complete large-scale equipment is needed, the cost is too high, and hidden danger of leakage exists in auxiliary material liquid ammonia and ammonia generated in the ammonia distillation process. The double decomposition reaction of sodium chloride and ammonium bicarbonate can avoid the processes of ammonia distillation, ammoniation, carbonation and the like in the traditional method, and is an ideal method for preparing sodium carbonate by high-value conversion of sodium chloride. However, the conversion rate in the double decomposition reaction process is not 100%, ammonium bicarbonate still exists in the mother solution after the reaction, and if the ammonium bicarbonate is not recovered and is directly added into sodium chloride for salting out, mixed crystals of sodium bicarbonate and ammonium chloride can be obtained.
In order to avoid the problem of co-precipitation of sodium bicarbonate and ammonium chloride, various solutions have been proposed in the industry: CN116375055a discloses a method for producing baking soda and ammonium chloride from industrial waste salt. The process adopts hydrochloric acid to neutralize a large amount of unreacted ammonium bicarbonate, avoids the generation of mixed crystals of sodium bicarbonate and ammonium chloride, and obtains an ammonium chloride product through salting-out crystallization of an alcohol salting-out agent. The method adopts the reaction of hydrochloric acid and ammonium bicarbonate to generate carbon dioxide, thereby not only reducing the output of high-value sodium bicarbonate, but also discharging greenhouse gas carbon dioxide, and further increasing the cost by adding alcohol salting-out agent, and having poor economic benefit and environmental protection benefit. In addition, a portion of the sodium chloride and ammonium chloride mixed salt in the process returns to double decomposition, possibly causing excessive ammonium chloride product to enter the baking soda, and reducing the quality of the baking soda product.
CN114751430a discloses a method for producing sodium bicarbonate and co-producing ammonium chloride by a low-temperature bidirectional salting-out circulation method. In order to avoid the problem that sodium chloride is salted out of sodium bicarbonate mother liquor to produce mixed crystals of sodium bicarbonate and ammonium chloride, salting-out agents such as sodium nitrate, sodium sulfate and the like are added in the double decomposition reaction process, excessive sodium ions are utilized to consume bicarbonate ions as much as possible, the conversion rate of bicarbonate is improved, and then sodium chloride is added into the sodium bicarbonate mother liquor and the ammonium chloride is cooled and crystallized. The method can improve the conversion rate of bicarbonate to a certain extent after adding sodium nitrate, but the solubility of ammonium nitrate generated in the reaction process is extremely high, nitrate radical in solution can compete for ammonium ions in ammonium chloride, the concentration of ammonium chloride is reduced, and meanwhile, the concentration of sodium nitrate is also reduced, so that only a small amount of ammonium chloride products can be separated out when the temperature is reduced, and after repeated utilization, the effect of a salting-out agent is weaker and weaker, ammonium chloride generated by double decomposition reaction can enter sodium bicarbonate, the product quality is reduced, and the ammonium chloride products are fewer and fewer.
Therefore, in view of the deficiencies of the prior art, there is a need to provide a method for preparing high purity sodium carbonate and ammonium chloride using sodium chloride waste salts.
Disclosure of Invention
In view of the problems existing in the prior art, the invention provides a method for preparing high-purity sodium carbonate and ammonium chloride by using sodium chloride waste salt, which comprises the steps of adding sodium chloride into sodium bicarbonate mother liquor obtained after double decomposition reaction for salting-out crystallization, generating mixed crystals of sodium bicarbonate and ammonium chloride on the premise of decomposing bicarbonate without adding other substances, performing primary cooling crystallization on the salting-out crystallization mother liquor, and dissolving ammonium chloride in the mixed crystals by using primary cooling crystallization mother liquor; compared with the traditional ammonia-soda process and the combined soda process, the method has the advantages of shorter flow, less required equipment, low running cost and the like, has remarkable economic and environmental benefits, can be used for preparing high-purity sodium carbonate and ammonium chloride, has high purity of the obtained product, ensures that the total alkali content of the sodium carbonate product is more than 99.0 percent, meets the requirements of industrial sodium carbonate II qualified products in GB/T210-2022, and ensures that the mass percent of the ammonium chloride product is more than 99 percent and meets the requirements of industrial ammonium chloride qualified products in GB/T2946-2018.
To achieve the purpose, the invention adopts the following technical scheme:
the invention aims to provide a method for preparing high-purity sodium carbonate and ammonium chloride by using sodium chloride waste salt, which comprises the following steps:
(1) Performing double decomposition reaction on the mixed ammonium bicarbonate and the secondary cooling crystallization mother liquor, and performing solid-liquid separation to obtain primary sodium bicarbonate and sodium bicarbonate mother liquor;
(2) Adding sodium chloride into the sodium bicarbonate mother solution in the step (1) for salting-out crystallization, and carrying out solid-liquid separation to obtain salting-out crystallization mother solution and mixed crystals of sodium bicarbonate and ammonium chloride;
(3) Performing primary cooling crystallization on the salting-out crystallization mother liquor obtained in the step (2), and performing solid-liquid separation to obtain primary ammonium chloride and primary cooling crystallization mother liquor;
(4) Mixing the primary cooling crystallization mother liquor in the step (3) and the mixed crystal of sodium bicarbonate and ammonium chloride in the step (2), dissolving ammonium chloride in the mixed crystal, and carrying out solid-liquid separation to obtain secondary sodium bicarbonate and ammonium chloride dissolution mother liquor;
(5) Performing secondary cooling crystallization on the ammonium chloride dissolution mother liquor obtained in the step (4), and performing solid-liquid separation to obtain secondary ammonium chloride and secondary cooling crystallization mother liquor; the secondary cooling crystallization mother liquor is recycled to the step (1);
wherein, the primary sodium bicarbonate in the step (1) and the secondary sodium bicarbonate in the step (4) are mixed and then calcined to obtain a sodium carbonate product; mixing the primary ammonium chloride in the step (3) with the secondary ammonium chloride in the step (5) to obtain an ammonium chloride product.
The method can realize that sodium chloride can prepare sodium carbonate and ammonium chloride products meeting industrial standards, has simple process flow and low cost, and solves the problems of high energy consumption, more equipment, complex flow, high environmental risk and the like caused by high-temperature decomposition, salting-out agent addition or acid addition in the process of preparing sodium carbonate by double decomposition of sodium chloride and ammonium bicarbonate. The method of the invention provides the following innovative thinking based on the phase balance rule of a multielement water-salt system: sodium chloride is still added into mother solution after sodium bicarbonate precipitation for salting out, and mixed crystals of sodium bicarbonate and ammonium chloride are produced on the premise of decomposing bicarbonate without adding other substances; performing primary cooling crystallization on salting-out crystallization mother liquor after mixed crystal precipitation to obtain primary ammonium chloride crystals and primary cooling crystallization mother liquor, changing ammonium chloride in the primary cooling crystallization mother liquor from saturated to unsaturated after temperature rising, and dissolving ammonium chloride in mixed crystals of sodium bicarbonate and ammonium chloride by using the primary cooling crystallization mother liquor after temperature rising to obtain ammonium chloride dissolution mother liquor, wherein the sodium bicarbonate is insoluble and remains in a solid phase; the ammonium chloride dissolving mother solution is subjected to secondary cooling crystallization to obtain secondary ammonium chloride and secondary cooling crystallization mother solution, and the high-efficiency separation of sodium bicarbonate and ammonium chloride mixed crystals is realized through heating dissolution and cooling crystallization; and adding ammonium bicarbonate into the secondary cooling crystallization mother liquor, reacting the ammonium bicarbonate with sodium chloride dissolved in the salting-out process to generate primary sodium bicarbonate, mixing the primary sodium bicarbonate with secondary sodium bicarbonate, and calcining to obtain a sodium carbonate product.
The method utilizes the sodium chloride waste salt to prepare the high-purity sodium carbonate and ammonium chloride, and the obtained products have high purity and all meet the content standard of industrial products; the technological process is simple to operate, does not need an ammonia distillation process, does not generate three wastes, and has good economic and environmental benefits.
After the circulating and recycling system of the intermediate materials is established, mixed crystals of sodium bicarbonate and ammonium chloride are completely returned to be dissolved.
As a preferred embodiment of the present invention, the amount of ammonium bicarbonate added in the metathesis reaction in the step (1) is 1 to 1.4 times, for example, 1 time, 1.05 times, 1.1 times, 1.15 times, 1.2 times, 1.25 times, 1.3 times, 1.35 times or 1.4 times, the molar amount of sodium chloride in the liquid phase, etc., but is not limited to the recited values, and other non-recited values within the range of the values are equally applicable.
As a preferred embodiment of the present invention, the metathesis reaction in the step (1) is carried out at a temperature of 30 to 50 ℃, for example, 30 ℃, 33 ℃, 35 ℃, 37 ℃, 40 ℃, 43 ℃, 45 ℃, 47 ℃, 50 ℃ or the like for a time of 30 to 240 minutes, for example, 30 minutes, 50 minutes, 80 minutes, 100 minutes, 130 minutes, 150 minutes, 180 minutes, 200 minutes, 220 minutes or 240 minutes or the like, but not limited to the above-mentioned values, and other values not mentioned in the above-mentioned value ranges are equally applicable.
As a preferable technical scheme of the invention, the concentration of sodium ions in the salting-out crystallization mother liquor in the step (2) is more than 80g/L, and the sodium chloride content in the mixed crystal of sodium bicarbonate and ammonium chloride is less than 5wt%.
The method needs to control the concentration of sodium ions in the salting-out crystallization mother liquor to be more than 80g/L, namely, the concentration of sodium ions in the solution after adding sodium chloride to be more than 80g/L, so that the sodium chloride is ensured to be completely dissolved, and the sodium chloride content in the mixed crystal of sodium bicarbonate and ammonium chloride obtained by salting-out is ensured to be less than 5wt% so as to avoid excessive sodium chloride.
In a preferred embodiment of the present invention, the salting-out crystallization in the step (2) is carried out at a temperature of 25 to 50 ℃, for example, 25 ℃, 30 ℃, 35 ℃, 40 ℃, 45 ℃, 50 ℃ or the like, but the present invention is not limited to the above-mentioned values, and other values not shown in the above-mentioned value range are equally applicable.
In a preferred embodiment of the present invention, the primary cooling crystallization in the step (3) is carried out at a temperature of 0 to 30 ℃, for example, 0 ℃, 3 ℃, 5 ℃, 7 ℃, 10 ℃, 13 ℃, 15 ℃, 20 ℃, 23 ℃, 25 ℃, 28 ℃, 30 ℃ or the like, and the concentration of ammonium ions in the primary cooling crystallization mother liquor is less than 60g/L, but the primary cooling crystallization mother liquor is not limited to the above-mentioned values, and other non-mentioned values within the above-mentioned range are equally applicable.
In a preferred embodiment of the present invention, the temperature of the dissolution in the step (4) is 30 to 60 ℃, for example, 30 ℃, 33 ℃, 35 ℃, 37 ℃, 40 ℃, 45 ℃, 48 ℃, 50 ℃, 55 ℃, 60 ℃ or the like, but the dissolution is not limited to the above-mentioned values, and other values not mentioned in the above-mentioned value range are equally applicable.
As a preferred embodiment of the present invention, the completion end point of the dissolution in the step (4) is that the chlorine content of the insoluble crystals in the reaction system is < 0.5wt%.
In a preferred embodiment of the present invention, the temperature of the secondary cooling crystallization in the step (5) is 0 to 20 ℃, for example, 0 ℃, 3 ℃, 5 ℃, 7 ℃, 10 ℃, 13 ℃, 15 ℃, 17 ℃, or 20 ℃, and the concentration of ammonium ions in the secondary cooling crystallization mother liquor is less than 60g/L, but the method is not limited to the above-mentioned values, and other non-mentioned values in the above-mentioned value range are applicable.
As a preferred embodiment of the present invention, the solid-liquid separation in steps (1) to (5) each independently includes any one or a combination of at least two of hydrocyclone separation, centrifugal separation, filtration separation and sedimentation separation.
Compared with the prior art, the invention has at least the following beneficial effects:
(1) The method prepares the sodium chloride and ammonium bicarbonate into high-purity sodium carbonate and ammonium chloride by double decomposition, the purity of the obtained product is high, the total alkali content of the sodium carbonate product is more than 99.0 percent, the requirements of industrial sodium carbonate II qualified products in GB/T210-2022 are met, the mass percent of the ammonium chloride product is more than 99 percent, and the requirements of industrial ammonium chloride qualified products in GB/T2946-2018 are met;
(2) In order to avoid co-crystallization of sodium bicarbonate and ammonium chloride, the prior method usually adopts heating, salting-out agent adding or acid-base adding to decompose bicarbonate, so that the problems of high production cost, large environmental risk and the like are caused, and the method of the invention overcomes the problems in the prior method and utilizes the ways of heating and cooling the ammonium chloride mother liquor to perform gradient crystallization and separation on sodium bicarbonate and ammonium chloride;
(3) The method has the advantages of short process flow, no high-temperature ammonia distillation process, no need of complex ammoniation tower and carbonator tower groups, simple equipment, no water balance problem in the process, low cost, economic and environmental benefits and the like.
Drawings
FIG. 1 is a flow chart of a method for preparing high-purity sodium carbonate and ammonium chloride by using sodium chloride waste salt according to the invention.
Detailed Description
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
For a better illustration of the present invention, which is convenient for understanding the technical solution of the present invention, exemplary but non-limiting examples of the present invention are as follows:
the invention provides a method for preparing high-purity sodium carbonate and ammonium chloride by using sodium chloride waste salt, which is shown in figure 1 and comprises the following steps:
(1) Performing double decomposition reaction on the mixed ammonium bicarbonate and the secondary cooling crystallization mother liquor, and performing solid-liquid separation to obtain primary sodium bicarbonate and sodium bicarbonate mother liquor;
(2) Adding sodium chloride into the sodium bicarbonate mother solution in the step (1) for salting-out crystallization, and carrying out solid-liquid separation to obtain salting-out crystallization mother solution and mixed crystals of sodium bicarbonate and ammonium chloride;
(3) Performing primary cooling crystallization on the salting-out crystallization mother liquor obtained in the step (2), and performing solid-liquid separation to obtain primary ammonium chloride and primary cooling crystallization mother liquor;
(4) Mixing the primary cooling crystallization mother liquor in the step (3) and the mixed crystal of sodium bicarbonate and ammonium chloride in the step (2), dissolving ammonium chloride in the mixed crystal, and carrying out solid-liquid separation to obtain secondary sodium bicarbonate and ammonium chloride dissolution mother liquor;
(5) Performing secondary cooling crystallization on the ammonium chloride dissolution mother liquor obtained in the step (4), and performing solid-liquid separation to obtain secondary ammonium chloride and secondary cooling crystallization mother liquor; the secondary cooling crystallization mother liquor is recycled to the step (1);
wherein, the primary sodium bicarbonate in the step (1) and the secondary sodium bicarbonate in the step (4) are mixed and then calcined to obtain a sodium carbonate product; mixing the primary ammonium chloride in the step (3) with the secondary ammonium chloride in the step (5) to obtain an ammonium chloride product.
The invention provides a method for preparing high-purity sodium carbonate and ammonium chloride by utilizing sodium chloride waste salt, which comprises the following primary reaction flow before a recycling system of intermediate materials is established:
(i) Mixing ammonium bicarbonate, sodium chloride and clear water, controlling the molar ratio of the ammonium bicarbonate to the sodium chloride to be (1-1.4): 1, carrying out double decomposition reaction at 30-50 ℃ for 0.5-3h, and obtaining sodium bicarbonate solid and sodium bicarbonate mother liquor after solid-liquid separation;
(ii) Adding sodium chloride into the sodium bicarbonate mother solution obtained in the step (i) for salting-out crystallization, wherein sodium ions in the salted-out solution are more than 80g/L, so that sodium chloride is completely dissolved, the salting-out crystallization temperature is 25-50 ℃, and solid-liquid separation is carried out to obtain salting-out crystallization mother solution and mixed crystals of sodium bicarbonate and ammonium chloride, wherein the sodium chloride content in the mixed crystals of sodium bicarbonate and ammonium chloride is less than 5wt%;
(iii) Cooling and crystallizing the salting-out crystallization mother liquor obtained in the step (ii), wherein the temperature of cooling and crystallizing is 0-20 ℃, and obtaining an ammonium chloride product and an ammonium chloride cooling mother liquor after solid-liquid separation;
wherein, the ammonium chloride cooling mother liquor obtained in the step (iii) is used as the secondary cooling crystallization mother liquor of a recycling system for mixing with ammonium bicarbonate to carry out double decomposition reaction.
Example 1
The embodiment provides a method for preparing high-purity sodium carbonate and ammonium chloride by using sodium chloride waste salt, which comprises the following steps:
(1) The mixed ammonium bicarbonate and the secondary cooling crystallization mother liquor are subjected to double decomposition reaction at 35 ℃, the adding amount of the ammonium bicarbonate is 1.1 times of the molar amount of sodium chloride in the liquid phase, the double decomposition reaction time is 180min, and the primary sodium bicarbonate and the sodium bicarbonate mother liquor are obtained after solid-liquid separation;
(2) Adding sodium chloride into the sodium bicarbonate mother solution obtained in the step (1) for salting-out crystallization at 35 ℃, and carrying out solid-liquid separation to obtain salting-out crystallization mother solution and mixed crystals of sodium bicarbonate and ammonium chloride, wherein the concentration of sodium ions in the salting-out crystallization mother solution is more than 80g/L, and the sodium chloride content in the mixed crystals of sodium bicarbonate and ammonium chloride is less than 5wt%;
(3) Performing primary cooling crystallization on the salting-out crystallization mother liquor in the step (2) at 15 ℃ and performing solid-liquid separation to obtain primary ammonium chloride and primary cooling crystallization mother liquor, wherein the concentration of ammonium ions in the primary cooling crystallization mother liquor is less than 60g/L;
(4) Mixing the primary cooling crystallization mother liquor in the step (3) and the mixed crystal of sodium bicarbonate and ammonium chloride in the step (2), dissolving ammonium chloride in the mixed crystal at 40 ℃, wherein the completion end point of the dissolution is that the chlorine content of insoluble crystals in a reaction system is less than 0.5wt%, and obtaining secondary sodium bicarbonate and ammonium chloride dissolution mother liquor after solid-liquid separation;
(5) Performing secondary cooling crystallization on the ammonium chloride dissolution mother liquor obtained in the step (4) at the temperature of 10 ℃, and performing solid-liquid separation to obtain secondary ammonium chloride and secondary cooling crystallization mother liquor; the concentration of ammonium ions in the secondary cold-precipitation crystallization mother liquor is less than 60g/L, and the secondary cooling crystallization mother liquor is recycled in the step (1);
wherein, the primary sodium bicarbonate in the step (1) and the secondary sodium bicarbonate in the step (4) are mixed and then calcined to obtain a sodium carbonate product; mixing the primary ammonium chloride in the step (3) with the secondary ammonium chloride in the step (5) to obtain an ammonium chloride product.
Example 2
The embodiment provides a method for preparing high-purity sodium carbonate and ammonium chloride by using sodium chloride waste salt, which comprises the following steps:
(1) Carrying out double decomposition reaction on mixed ammonium bicarbonate and secondary cooling crystallization mother liquor at 40 ℃, wherein the adding amount of the ammonium bicarbonate is 1 time of the molar amount of sodium chloride in a liquid phase, the double decomposition reaction time is 90 minutes, and the primary sodium bicarbonate and sodium bicarbonate mother liquor are obtained after solid-liquid separation;
(2) Adding sodium chloride into the sodium bicarbonate mother solution obtained in the step (1) for salting-out crystallization at 40 ℃, and carrying out solid-liquid separation to obtain salting-out crystallization mother solution and mixed crystals of sodium bicarbonate and ammonium chloride, wherein the concentration of sodium ions in the salting-out crystallization mother solution is more than 80g/L, and the sodium chloride content in the mixed crystals of sodium bicarbonate and ammonium chloride is less than 5wt%;
(3) Performing primary cooling crystallization on the salting-out crystallization mother liquor in the step (2) at 20 ℃ and performing solid-liquid separation to obtain primary ammonium chloride and primary cooling crystallization mother liquor, wherein the concentration of ammonium ions in the primary cooling crystallization mother liquor is less than 60g/L;
(4) Mixing the primary cooling crystallization mother liquor in the step (3) and the mixed crystal of sodium bicarbonate and ammonium chloride in the step (2), dissolving ammonium chloride in the mixed crystal at 50 ℃, wherein the completion end point of the dissolution is that the chlorine content of insoluble crystals in a reaction system is less than 0.5wt%, and obtaining secondary sodium bicarbonate and ammonium chloride dissolution mother liquor after solid-liquid separation;
(5) Performing secondary cooling crystallization on the ammonium chloride dissolution mother liquor obtained in the step (4) at 15 ℃, and performing solid-liquid separation to obtain secondary ammonium chloride and secondary cooling crystallization mother liquor; the concentration of ammonium ions in the secondary cold-precipitation crystallization mother liquor is less than 60g/L, and the secondary cooling crystallization mother liquor is recycled in the step (1);
wherein, the primary sodium bicarbonate in the step (1) and the secondary sodium bicarbonate in the step (4) are mixed and then calcined to obtain a sodium carbonate product; mixing the primary ammonium chloride in the step (3) with the secondary ammonium chloride in the step (5) to obtain an ammonium chloride product.
Example 3
The embodiment provides a method for preparing high-purity sodium carbonate and ammonium chloride by using sodium chloride waste salt, which comprises the following steps:
(1) Carrying out double decomposition reaction on mixed ammonium bicarbonate and secondary cooling crystallization mother liquor at 30 ℃, wherein the adding amount of the ammonium bicarbonate is 1.2 times of the molar amount of sodium chloride in a liquid phase, the double decomposition reaction time is 240min, and the primary sodium bicarbonate and sodium bicarbonate mother liquor are obtained after solid-liquid separation;
(2) Adding sodium chloride into the sodium bicarbonate mother solution obtained in the step (1) for salting-out crystallization at 25 ℃, and carrying out solid-liquid separation to obtain salting-out crystallization mother solution and mixed crystals of sodium bicarbonate and ammonium chloride, wherein the concentration of sodium ions in the salting-out crystallization mother solution is more than 80g/L, and the sodium chloride content in the mixed crystals of sodium bicarbonate and ammonium chloride is less than 5wt%;
(3) Performing primary cooling crystallization on the salting-out crystallization mother liquor obtained in the step (2) at the temperature of 0 ℃, and performing solid-liquid separation to obtain primary ammonium chloride and primary cooling crystallization mother liquor, wherein the concentration of ammonium ions in the primary cooling crystallization mother liquor is less than 60g/L;
(4) Mixing the primary cooling crystallization mother liquor in the step (3) and the mixed crystal of sodium bicarbonate and ammonium chloride in the step (2), dissolving ammonium chloride in the mixed crystal at 30 ℃, wherein the completion end point of the dissolution is that the chlorine content of insoluble crystals in a reaction system is less than 0.5wt%, and obtaining secondary sodium bicarbonate and ammonium chloride dissolution mother liquor after solid-liquid separation;
(5) Performing secondary cooling crystallization on the ammonium chloride dissolution mother liquor obtained in the step (4) at the temperature of 0 ℃, and performing solid-liquid separation to obtain secondary ammonium chloride and secondary cooling crystallization mother liquor; the concentration of ammonium ions in the secondary cold-precipitation crystallization mother liquor is less than 60g/L, and the secondary cooling crystallization mother liquor is recycled in the step (1);
wherein, the primary sodium bicarbonate in the step (1) and the secondary sodium bicarbonate in the step (4) are mixed and then calcined to obtain a sodium carbonate product; mixing the primary ammonium chloride in the step (3) with the secondary ammonium chloride in the step (5) to obtain an ammonium chloride product.
Example 4
The embodiment provides a method for preparing high-purity sodium carbonate and ammonium chloride by using sodium chloride waste salt, which comprises the following steps:
(1) Carrying out double decomposition reaction on mixed ammonium bicarbonate and secondary cooling crystallization mother liquor at 50 ℃, wherein the adding amount of the ammonium bicarbonate is 1.3 times of the molar amount of sodium chloride in a liquid phase, the double decomposition reaction time is 30min, and the primary sodium bicarbonate and sodium bicarbonate mother liquor are obtained after solid-liquid separation;
(2) Adding sodium chloride into the sodium bicarbonate mother solution obtained in the step (1) for salting-out crystallization at 50 ℃, and carrying out solid-liquid separation to obtain salting-out crystallization mother solution and mixed crystals of sodium bicarbonate and ammonium chloride, wherein the concentration of sodium ions in the salting-out crystallization mother solution is more than 80g/L, and the sodium chloride content in the mixed crystals of sodium bicarbonate and ammonium chloride is less than 5wt%;
(3) Performing primary cooling crystallization on the salting-out crystallization mother liquor in the step (2) at 25 ℃ and performing solid-liquid separation to obtain primary ammonium chloride and primary cooling crystallization mother liquor, wherein the concentration of ammonium ions in the primary cooling crystallization mother liquor is less than 60g/L;
(4) Mixing the primary cooling crystallization mother liquor in the step (3) and the mixed crystal of sodium bicarbonate and ammonium chloride in the step (2), dissolving ammonium chloride in the mixed crystal at 60 ℃, wherein the completion end point of the dissolution is that the chlorine content of insoluble crystals in a reaction system is less than 0.5wt%, and obtaining secondary sodium bicarbonate and ammonium chloride dissolution mother liquor after solid-liquid separation;
(5) Performing secondary cooling crystallization on the ammonium chloride dissolution mother liquor obtained in the step (4) at 20 ℃, and performing solid-liquid separation to obtain secondary ammonium chloride and secondary cooling crystallization mother liquor; the concentration of ammonium ions in the secondary cold-precipitation crystallization mother liquor is less than 60g/L, and the secondary cooling crystallization mother liquor is recycled in the step (1);
wherein, the primary sodium bicarbonate in the step (1) and the secondary sodium bicarbonate in the step (4) are mixed and then calcined to obtain a sodium carbonate product; mixing the primary ammonium chloride in the step (3) with the secondary ammonium chloride in the step (5) to obtain an ammonium chloride product.
Example 5
The embodiment provides a method for preparing high-purity sodium carbonate and ammonium chloride by using sodium chloride waste salt, which comprises the following steps:
(1) Carrying out double decomposition reaction on mixed ammonium bicarbonate and secondary cooling crystallization mother liquor at 35 ℃, wherein the adding amount of the ammonium bicarbonate is 1.4 times of the molar amount of sodium chloride in a liquid phase, the double decomposition reaction time is 180min, and the primary sodium bicarbonate and sodium bicarbonate mother liquor are obtained after solid-liquid separation;
(2) Adding sodium chloride into the sodium bicarbonate mother solution obtained in the step (1) for salting-out crystallization at 30 ℃, and carrying out solid-liquid separation to obtain salting-out crystallization mother solution and mixed crystals of sodium bicarbonate and ammonium chloride, wherein the concentration of sodium ions in the salting-out crystallization mother solution is more than 80g/L, and the sodium chloride content in the mixed crystals of sodium bicarbonate and ammonium chloride is less than 5wt%;
(3) Performing primary cooling crystallization on the salting-out crystallization mother liquor in the step (2) at the temperature of 10 ℃ and performing solid-liquid separation to obtain primary ammonium chloride and primary cooling crystallization mother liquor, wherein the concentration of ammonium ions in the primary cooling crystallization mother liquor is less than 60g/L;
(4) Mixing the primary cooling crystallization mother liquor in the step (3) and the mixed crystal of sodium bicarbonate and ammonium chloride in the step (2), dissolving ammonium chloride in the mixed crystal at 45 ℃, wherein the completion end point of the dissolution is that the chlorine content of insoluble crystals in a reaction system is less than 0.5wt%, and obtaining secondary sodium bicarbonate and ammonium chloride dissolution mother liquor after solid-liquid separation;
(5) Performing secondary cooling crystallization on the ammonium chloride dissolution mother liquor obtained in the step (4) at the temperature of 5 ℃, and performing solid-liquid separation to obtain secondary ammonium chloride and secondary cooling crystallization mother liquor; the concentration of ammonium ions in the secondary cold-precipitation crystallization mother liquor is less than 60g/L, and the secondary cooling crystallization mother liquor is recycled in the step (1);
wherein, the primary sodium bicarbonate in the step (1) and the secondary sodium bicarbonate in the step (4) are mixed and then calcined to obtain a sodium carbonate product; mixing the primary ammonium chloride in the step (3) with the secondary ammonium chloride in the step (5) to obtain an ammonium chloride product.
The total alkali content of the sodium carbonate product and the mass percentage of the ammonium chloride product obtained in the above examples are summarized in table 1.
TABLE 1
In summary, the method of the invention prepares sodium chloride and ammonium bicarbonate into high-purity sodium carbonate and ammonium chloride by double decomposition, the purity of the obtained product is high, the total alkali content of the sodium carbonate product is more than 99.0 percent, the requirements of industrial sodium carbonate II qualified products in GB/T210-2022 are met, the mass percent of the ammonium chloride product is more than 99 percent, and the requirements of industrial ammonium chloride qualified products in GB/T2946-2018 are met; in order to avoid co-crystallization of sodium bicarbonate and ammonium chloride, the prior method usually adopts heating, salting-out agent adding or acid-base adding to decompose bicarbonate, so that the problems of high production cost, large environmental risk and the like are caused, and the method of the invention overcomes the problems in the prior method and utilizes the ways of heating and cooling the ammonium chloride mother liquor to perform gradient crystallization and separation on sodium bicarbonate and ammonium chloride; the method has the advantages of short process flow, no high-temperature ammonia distillation process, no need of complex ammoniation tower and carbonator tower groups, simple equipment, no water balance problem in the process, low cost, economic and environmental benefits and the like.
The detailed structural features of the present invention are described in the above embodiments, but the present invention is not limited to the above detailed structural features, that is, it does not mean that the present invention must be implemented depending on the above detailed structural features. It should be apparent to those skilled in the art that any modifications of the present invention, equivalent substitutions of selected components of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope of the present invention and the scope of the disclosure.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.
Claims (10)
1. A method for preparing high-purity sodium carbonate and ammonium chloride by using sodium chloride waste salt, which is characterized by comprising the following steps:
(1) Performing double decomposition reaction on the mixed ammonium bicarbonate and the secondary cooling crystallization mother liquor, and performing solid-liquid separation to obtain primary sodium bicarbonate and sodium bicarbonate mother liquor;
(2) Adding sodium chloride into the sodium bicarbonate mother solution in the step (1) for salting-out crystallization, and carrying out solid-liquid separation to obtain salting-out crystallization mother solution and mixed crystals of sodium bicarbonate and ammonium chloride;
(3) Performing primary cooling crystallization on the salting-out crystallization mother liquor obtained in the step (2), and performing solid-liquid separation to obtain primary ammonium chloride and primary cooling crystallization mother liquor;
(4) Mixing the primary cooling crystallization mother liquor in the step (3) and the mixed crystal of sodium bicarbonate and ammonium chloride in the step (2), dissolving ammonium chloride in the mixed crystal, and carrying out solid-liquid separation to obtain secondary sodium bicarbonate and ammonium chloride dissolution mother liquor;
(5) Performing secondary cooling crystallization on the ammonium chloride dissolution mother liquor obtained in the step (4), and performing solid-liquid separation to obtain secondary ammonium chloride and secondary cooling crystallization mother liquor; the secondary cooling crystallization mother liquor is recycled to the step (1);
wherein, the primary sodium bicarbonate in the step (1) and the secondary sodium bicarbonate in the step (4) are mixed and then calcined to obtain a sodium carbonate product; mixing the primary ammonium chloride in the step (3) with the secondary ammonium chloride in the step (5) to obtain an ammonium chloride product.
2. The method for preparing high-purity sodium carbonate and ammonium chloride using sodium chloride waste salt according to claim 1, wherein the amount of ammonium bicarbonate added in the metathesis reaction of step (1) is 1 to 1.4 times the molar amount of sodium chloride in the liquid phase.
3. The method for preparing high-purity sodium carbonate and ammonium chloride using sodium chloride waste salt according to claim 1, wherein the metathesis reaction in step (1) is carried out at a temperature of 30-50 ℃ for 30-240min.
4. The method for preparing high-purity sodium carbonate and ammonium chloride by utilizing sodium chloride waste salt according to claim 1, wherein the concentration of sodium ions in the salting-out crystallization mother liquor in the step (2) is more than 80g/L, and the sodium chloride content in the mixed crystal of sodium bicarbonate and ammonium chloride is less than 5wt%.
5. The method for preparing high-purity sodium carbonate and ammonium chloride using waste sodium chloride salt according to claim 1, wherein the salting-out crystallization temperature in the step (2) is 25-50 ℃.
6. The method for preparing high-purity sodium carbonate and ammonium chloride by using sodium chloride waste salt according to claim 1, wherein the temperature of the primary cooling crystallization in the step (3) is 0-30 ℃, and the concentration of ammonium ions in the primary cooling crystallization mother liquor is less than 60g/L.
7. The method for preparing high purity sodium carbonate and ammonium chloride using waste sodium chloride salt according to claim 1, wherein the temperature of the dissolution in step (4) is 30-60 ℃.
8. The method for producing high purity sodium carbonate and ammonium chloride according to claim 1, wherein the completion of the dissolution in the step (4) is the completion of the chlorine content of insoluble crystals in the reaction system of < 0.5wt%.
9. The method for preparing high-purity sodium carbonate and ammonium chloride by using sodium chloride waste salt according to claim 1, wherein the temperature of the secondary cooling crystallization in the step (5) is 0-20 ℃, and the concentration of ammonium ions in the secondary cooling crystallization mother liquor is less than 60g/L.
10. The method for producing high-purity sodium carbonate and ammonium chloride according to claim 1, wherein the means for solid-liquid separation in steps (1) to (5) each independently comprises any one or a combination of at least two of hydrocyclone separation, centrifugal separation, filtration separation and sedimentation separation.
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