Deodorization method combining brine acidification synchronous aeration and activated carbon adsorption in refined salt production

Abstract

The invention discloses a deodorization method combining brine acidification, aeration and activated carbon adsorption in refined salt production, which comprises the following steps: S1, adding hydrochloric acid into brine to adjust the pH value of the brine to 3-5 so as to acidify the brine; meanwhile, compressed air is blown into the brine for aeration, and acidified and aerated brine is obtained; s2, treating the acidified and aerated brine by adopting an activated carbon adsorption method; s3, adding sodium hydroxide and sodium carbonate into the brine treated in the step S2, and performing calcium and magnesium removal purification to obtain refined brine; s4, the refined brine is sequentially subjected to evaporative crystallization, centrifugal separation and drying, and refined salt is obtained. Other chemical components are not added in the technological process, the safety is high, the production cost is low, the production efficiency is high, and the problem that the brine deodorization technology in the current refined salt production cannot give consideration to both edible safety and economic benefits is well solved.

Description

Technical Field

[0001] The invention belongs to the technical field of salt processing, and in particular relates to a deodorization method combining brine acidification, synchronous aeration and activated carbon adsorption in refined salt production. Background Art

[0002] The main component of table salt is sodium chloride, and it also contains impurities such as magnesium chloride and magnesium sulfate. Table salt ranks first among the seven flavors and is an indispensable condiment in people's diet. At present, the sources of table salt in my country are mainly sea salt, lake salt and well salt. Among them, well salt has gradually become the mainstream salt product due to its high quality.

[0003] At present, the brine used by most salt companies in Henan Province is collected from the Pingdingshan Salt Field, which ranks second in my country's inland salt fields in terms of reserves, and the average grade of rock salt reaches 89.1%, ranking first in the country in terms of quality. Although the content of harmful components and impurities in the salt field is low, during the period of salt rock deposition and diagenesis, the salt mine layer contains some residual organic matter. These organic matters include small molecules of organic acids and a small amount of small molecules of organic hydrocarbons, which cause the products produced by the salt mine brine to have obvious odor. Therefore, when producing refined salt, salt companies in the region need to consider the removal of odor or smell in brine. In the prior art, the more mature methods for deodorizing brine include:

[0004] (1) Baking method: The main disadvantages of the baking method are that the equipment is simple, no wastewater is generated, and the waste gas can also be treated by incineration. The disadvantages are that the temperature must be above 220°C, and the energy consumption is high; after baking, the salt turns yellow, the whiteness decreases, and the appearance is likely to be unqualified; and the odor cannot be completely removed.

[0005] (2) Redox method: Oxidants usually include hydrogen peroxide, hypochlorite, chlorite, etc. The advantages are that the deodorization is more thorough and the cost is low. The disadvantages are that oxidants such as chlorate are introduced into the product, and the safety of the salt product is questionable.

[0006] (3) Macroporous resin adsorption method: The resin is expensive (40,000-60,000 yuan / ton), and the amount of brine treated for the first time is about 1,000 times the amount of resin used. The resin is activated and reused repeatedly, and a large amount of acid and alkali treatment is required, and acid and alkali wastewater is generated. After repeated use, the resin with severe adsorption activity decay will become solid waste in large quantities, which puts great pressure on environmental protection.

[0007] (4) Aeration: Aeration is the process of forcibly transferring oxygen from the air into the liquid in order to obtain sufficient dissolved oxygen. However, aeration can only remove low-carbon alkanes and some aromatic hydrocarbons with a gasoline odor, and has a very limited effect on removing odor or stink from brine.

[0008] Furthermore, in order to improve the deodorization effect of brine, some improved methods based on the above-mentioned mature process are also disclosed in the prior art. For example, the Chinese patent (application number 201710388481.1) invention discloses a method for removing odor from refined salt. First, an initiator is added to the refined salt under continuous stirring, and the mixture is stirred to obtain a mixture; an aqueous hydrogen peroxide solution, an aqueous sodium chlorite solution and an aqueous sodium hypochlorite solution are added to the obtained mixture and mixed, and then the mixture is placed in an oven at a preset temperature for drying; the refined salt obtained after drying is analyzed by headspace gas chromatography, and the content of residual odor substances is calculated. The refined salt treated with this technical solution can be odorless and meet the relevant provisions of the latest version of the national standard; after being treated with this technical solution, the total volatile organic matter content in the sample can be reduced to below 5 mg / kg, and butyric acid is not detected. This technical solution is an improvement based on the redox method. Although it has a significant deodorizing effect on brine, it still requires the addition of chemical components such as hydrogen peroxide, sodium chlorite and sodium hypochlorite. It does not overcome the problem that the redox method for removing the odor of brine will have an adverse effect on the safety of salt products.

[0009] For another example, a Chinese patent (application number 202023302099.0) discloses a method for removing odor in refined salt production, comprising the following steps: the original brine is purified after removing insoluble impurities, and gas is blown into the purification process to remove some small molecular organic matter by aeration, and then a flocculant is added during the purification process to make the small molecular organic matter dissolved in the water and the fine particulate matter suspended in the water aggregate into large molecular clusters for precipitation, standing, discharging the precipitation, and the purified refined brine is subjected to multi-effect evaporation. During the multi-effect evaporation process, the mother liquor is controlled by the unsaturated method to keep the small molecular organic matter from attaching to the crystallized salt, and edible salt that meets national standards is obtained after evaporation and crystallization. The methods used in the present invention are all physical methods, which avoid the addition of other substances. The production process is safe, environmentally friendly, simple and intuitive, with low investment and low production cost. The finished edible salt produced is white in appearance, with a whiteness of more than 85%, no odor, and all indicators meet and exceed national standards. This technical solution adopts aeration method, flocculant sedimentation method and unsaturated method for joint control. Although they are all physical methods and will not affect the safety of salt products, the control of process parameters is relatively complicated. Especially in the unsaturated method, it is necessary to control the five-effect emission amounts of multi-effect evaporation to 10%, 20%, 30%, 40% and 50% of the feed amount respectively, which greatly reduces the production efficiency of refined salt and increases production costs.

[0010] In view of the above, due to the indispensability of refined salt to residents' lives and the meager profits from its production and sales, when researching and developing a deodorization process for refined salt production, emphasis should be placed on the food safety and economic benefits of the product. However, the currently disclosed technical solutions are difficult to meet the above demands. Therefore, it is urgent to develop a refined salt production deodorization process that is not only low-cost but also safe. Summary of the invention

[0011] In view of the above problems, the present invention provides a deodorization method for brine in refined salt production by combining acidification, synchronous aeration and activated carbon adsorption. The brine is first acidified and aerated synchronously, and then activated carbon adsorption is used to remove small molecular organic matter and low-carbon fatty acids that produce odor or peculiar smell in the brine. No other chemical components are added during the process. The method is not only highly safe, but also has low production costs and high production efficiency. It effectively solves the problem that the current brine deodorization process in refined salt production cannot take into account both food safety and economic benefits.

[0012] The present invention is achieved through the following technical solutions.

[0013] A deodorization method for brine acidification and synchronous aeration combined with activated carbon adsorption in refined salt production, characterized by comprising the following steps:

[0014] S1. Add hydrochloric acid to the brine to adjust the pH of the brine to 3-5 to acidify the brine; at the same time, blow compressed air into the brine for aeration to obtain acidified aerated brine;

[0015] S2. Treating acidified aerated brine using activated carbon adsorption;

[0016] S3, adding sodium hydroxide and sodium carbonate to the brine treated in step S2 to remove calcium and magnesium to obtain refined brine;

[0017] S4, sequentially subjecting the refined brine to evaporation crystallization, centrifugal separation and drying to obtain refined salt.

[0018] Preferably, the deodorization method of brine acidification, synchronous aeration and activated carbon adsorption in the production of refined salt comprises the following steps:

[0019] S1, sending the raw halogen into the primary reaction tank to remove insoluble impurities;

[0020] S2, sending the brine obtained in step S1 to a secondary reaction tank, adding hydrochloric acid to the brine in the secondary reaction tank to adjust the pH of the brine to 3-5, so as to acidify the brine; at the same time, blowing compressed air into the brine in the secondary reaction tank for aeration, so as to obtain acidified aerated brine;

[0021] S3, using activated carbon adsorption method to treat acidified aerated brine;

[0022] S4, sending the brine treated in step S3 to a tertiary reaction tank, adding sodium hydroxide and sodium carbonate to the tertiary reaction tank to adjust the pH of the brine to 8-10, so as to remove calcium and magnesium, and obtain refined brine;

[0023] S5. The refined brine is sent to the evaporator for evaporation, and the crystallized brine mixture enters the salt slurry barrel, and then centrifuged to obtain wet salt, which is sent to the drying bed for drying to obtain refined salt.

[0024] Preferably, the aeration conditions are: using an air compressor to prepare compressed air, blowing compressed air into the brine from the bottom, the pressure is 0.8-2 MPa, and the aeration time is 1.5-2.5 hours.

[0025] Preferably, the activated carbon used in the activated carbon adsorption method is wood activated carbon, and the particle size of the activated carbon is 30 to 50 meshes.

[0026] Preferably, the activated carbon adsorption method uses activated carbon column adsorption.

[0027] Preferably, the condition for the activated carbon column adsorption is an air velocity of 30 to 35 L / h / kg.

[0028] Preferably, the gas generated by the aeration method is blown into a boiler for use as fuel.

[0029] Preferably, the deactivated activated carbon produced in the activated carbon adsorption process is used as boiler fuel.

[0030] Preferably, the deactivated activated carbon produced in the activated carbon adsorption process is used as boiler fuel.

[0031] Based on the above description of the technical solution of the present invention, it can be seen that the present invention has at least the following beneficial effects:

[0032] 1) Usually, when preparing refined salt, it is necessary to add soda ash (sodium hydroxide) and caustic soda (sodium carbonate) to purify the brine so that the calcium and magnesium ions in the brine are precipitated and removed. Therefore, when deodorizing the brine, it is not easy for existing technicians to think of acidifying the brine. If the brine is acidified, the amount of soda ash and caustic soda used in purifying the brine will increase significantly, which is not conducive to reducing production costs. However, the applicant found that by acidifying the brine first, that is, adjusting the pH of the brine to 3-5, the adsorption capacity of activated carbon can be greatly improved. When the pH of the brine is not adjusted, the processing capacity of activated carbon is about 500 times its own weight, and when the brine is adjusted to a pH of 3-5, the processing capacity of activated carbon is increased to about 3000 times its own weight, and the adsorption capacity is increased by more than 6 times, thereby greatly reducing the amount of activated carbon used. In addition, the selection of activated carbon is very critical. The present invention finds that when using activated carbon to adsorb and treat brine, wood activated carbon is significantly better than coconut charcoal, bamboo charcoal and fruit shell charcoal. At the same time, the activated carbon adsorption method using the activated carbon column method is better than the dispersion stirring method, and the particle size control at 30-50 mesh is more appropriate.

[0033] 2) In the prior art, although aeration is a commonly used and relatively economical method for brine deodorization, aeration only has a good removal effect on low-carbon alkanes and some aromatic hydrocarbons with a gasoline smell. Activated carbon adsorption also only has a better adsorption effect on aromatic hydrocarbons and alkanes with low polarity, and its adsorption capacity for low-carbon fatty acids, which are odorous substances in brine, is limited. However, the processing cost of activated carbon adsorption is much higher than that of aeration. Therefore, activated carbon adsorption is not economical and feasible in brine deodorization. In summary, the prior art usually does not consider replacing aeration with activated carbon adsorption, which has the same function but is more expensive, or combining it with aeration. However, the present invention innovatively acidifies the brine first, and by optimizing the activated carbon adsorption parameters, the activated carbon adsorption capacity is greatly improved, thereby making it possible to economically apply activated carbon adsorption to brine deodorization. Furthermore, the present invention further innovates the use of aeration method and activated carbon adsorption, that is, the aeration method is first used to remove some hydrocarbons with lower boiling points and higher polarity and some organic acids with lower boiling points and lower polarity, so that the subsequent activated carbon adsorption can release more capacity to adsorb and remove low-carbon fatty acids, so that the aeration method and the activated carbon adsorption method can give full play to their respective advantages in removing different odor or odor source components in the brine, and at the same time, the amount of activated carbon used can be reduced, thereby reducing the cost of deodorization in the production of refined salt, and the deodorization effect can also be guaranteed. In addition, in the present invention, brine acidification and aeration are carried out simultaneously, so that not only can the two processes be combined into one, thereby achieving the purpose of improving production efficiency, but also the aeration can cause the brine to be stirred, so that the added acid and the brine can be quickly mixed and reacted, thereby further reducing the time required for the process.

[0034] 3) According to calculation, the present invention adopts the method of aeration combined with activated carbon adsorption, the price of activated carbon is about 10,000 yuan / ton, the amount of brine treated for the first time is about 3,000 times that of activated carbon, the activated carbon is reused about 6 times, and the amount of treatment is reduced to 40% after 6 activations. Activated carbon activation adopts water washing and desalination first, the desalted water can be used as brine water, and then high-temperature baking (200-300 degrees), the desorbed fatty acid gas and the severely attenuated activated carbon are discharged into the boiler as fuel for incineration. There is no waste discharge during the entire treatment process, and the finished salt produced by the treated brine is completely odorless. The treatment method of the present invention increases the treatment cost by only 3 to 8 yuan per ton of salt. In view of the meager profits in the current salt industry, most salt mining companies with odor cannot afford to increase the treatment cost of more than 20 yuan per ton of salt, so most companies have failed to take effective measures to clean the odor of produced salt. The treatment method of the present invention has no toxic and harmful waste discharge, is green and environmentally friendly, and most importantly, has a very low treatment cost, is both economical, environmentally friendly and feasible, and has good practical and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a process flow chart of the method of the present invention.

[0036] Figure 2 This is the detection result of PEN3 electronic nose. DETAILED DESCRIPTION

[0037] The present invention is further described below in conjunction with specific implementation methods. It should be pointed out that the following implementation methods are only illustrative descriptions of the present invention in the form of examples, but the protection scope of the present invention is not limited thereto. All equivalent replacements made by technicians in this field to the present invention in the spirit of the present invention fall within the protection scope of the present invention.

[0038] Example 1

[0039] A deodorization method for brine acidification and synchronous aeration combined with activated carbon adsorption in refined salt production comprises the following steps:

[0040] S1. Add hydrochloric acid to the brine to adjust the pH of the brine to 3-5 to acidify the brine; at the same time, blow compressed air into the brine for aeration to obtain acidified aerated brine;

[0041] S2. Treating acidified aerated brine using activated carbon adsorption;

[0042] S3, adding sodium hydroxide and sodium carbonate to the brine treated in step S2 to remove calcium and magnesium to obtain refined brine;

[0043] S4. The refined brine is evaporated, crystallized, centrifuged and dried in sequence to obtain refined salt.

[0044] Example 2

[0045] A deodorization method for brine acidification and synchronous aeration combined with activated carbon adsorption in refined salt production comprises the following steps:

[0046] S1, sending the raw halogen into the primary reaction tank to remove insoluble impurities;

[0047] S2, sending the brine obtained by the treatment in step S1 to a secondary reaction tank, adding hydrochloric acid to the brine in the secondary reaction tank to adjust the pH of the brine to 3-5, so as to acidify the brine; while adding hydrochloric acid, blowing compressed air into the bottom of the brine in the secondary reaction tank for aeration, the aeration pressure is 0.8-2MPa, and the aeration time is 1.5-2.5h, so as to remove small molecular organic matter (mainly non-polar low-boiling gasoline-like organic matter) and part of low-level fatty acids, so as to obtain acidified aerated brine, and the generated waste gas is blown into the boiler as fuel;

[0048] S3. Use activated carbon adsorption to treat acidified aerated brine; the activated carbon column conditions are: wood activated carbon is selected, the activated carbon particle size is 30-50 mesh, the air velocity is 30-35L / h / kg, and the odorous substances (mainly low-carbon fatty acids) are removed; among them, the activated carbon with severe adsorption activity decay after repeated use can be used as boiler fuel;

[0049] S4, sending the brine treated in step S3 to a tertiary reaction tank, adding sodium hydroxide and sodium carbonate to the tertiary reaction tank to adjust the pH of the brine to 8-10, so as to remove calcium and magnesium, so that the calcium and magnesium ions form a precipitate, and then adding a flocculant to aggregate the calcium and magnesium precipitate suspension and some small molecular organic matter and other fine particles suspended in the water into large molecular clusters, let it stand, discharge the precipitate, and obtain the refined brine after impurities are removed;

[0050] S5. The refined brine is sent to a multi-effect evaporator for vacuum evaporation to produce salt. The crystallized brine mixture enters a salt slurry barrel and is then centrifuged to obtain wet salt, which enters a drying bed and is dried to obtain refined salt.

[0051] Example 3

[0052] Parameter optimization of activated carbon adsorption method.

[0053] 1. Comparison between stirring adsorption method and column adsorption method

[0054] Stirring adsorption method: add 0.1% activated carbon to the acidified brine (pH=6) based on the weight of the brine, stir for two hours and then filter, and evaporate and crystallize to make salt according to the conventional salt making process.

[0055] Column adsorption method: load an appropriate amount of activated carbon into the column, moisten it with purified water, pass it through the column, control the flow rate at 10-20 ml / min, use 2.5 g of activated carbon, collect the brine after passing through the column, and make salt by evaporation and crystallization according to conventional salt making process.

[0056] The sensory evaluation method (human sniffing) and PEN3 electronic nose were used to investigate the odor differences between the refined salt obtained by treating brine with stirring adsorption method and the refined salt obtained by treating brine with column method, with Songtai 997 odorless salt and untreated odorous salt as controls. The results are shown in Tables 1 and Figure 1 .

[0057] Table 2 Differences in sensory evaluation of refined salt, odorous salt and odorless salt prepared by different activated carbon adsorption methods

[0058] Group People sniff Songtai 997 refined salt No odor Odor salt Obvious odor Stirring adsorption method Slight odor Column adsorption method (treating 1000 times brine) No odor

[0059] From Table 1 and Figure 1 It can be seen that after sensory evaluation, the refined salt prepared by the column adsorption method and the Songtai 997 refined salt have no peculiar smell, while the refined salt prepared by the stirring adsorption method has a slight peculiar smell. Through the PEN3 electronic nose detection, it can be seen that the detection results of the refined salt prepared by the column adsorption method are closer to the Songtai 997 refined salt, that is, the two have similar odors. In summary, when using activated carbon adsorption to treat brine to prepare refined salt, the effect of the column adsorption method is better than the stirring adsorption method.

[0060] 2. Comparison of adsorption properties of different activated carbon materials

[0061] The activated carbon column adsorption method was adopted, the particle size of the activated carbon was controlled to be 30-50 mesh, the air velocity was 30-35 L / h / kg (the amount of brine treated by unit mass of activated carbon per unit time), and the wood activated carbon, bamboo activated carbon, coconut shell activated carbon and fruit shell activated carbon with an iodine value of 900 were used to load the column respectively. The end point of brine deodorization was the absence of peculiar smell when the brine was smelled. The influence of different activated carbon materials on the brine treatment capacity was investigated. The results are shown in Table 3.

[0062] Table 2 Effect of different activated carbon materials on brine treatment capacity

[0063] Active Selection Brine treatment capacity (measured by weight ratio of brine passing through column to activated carbon loaded) Wood activated carbon 500 Coconut Shell Activated Carbon 360 Nutshell activated carbon 260 Bamboo activated carbon 350

[0064] It can be seen from Table 2 that under the same iodine value and particle size conditions, wood activated carbon has higher adsorption performance and greater brine treatment capacity. Therefore, the present invention selects wood activated carbon as the activated carbon adsorbent.

[0065] 3. Comparison of different activated carbon particle sizes

[0066] The activated carbon column adsorption method was adopted, and the iodine value of 900 wood activated carbon was selected. The air velocity was 25-35L / h / kg. The wood activated carbon with different particle sizes of 8-20 mesh, 20-30 mesh, 30-50 mesh, and 50-80 mesh were used to load the column. The end point of brine deodorization was the absence of peculiar smell when the brine was smelled. The influence of different activated carbon materials on the brine treatment capacity was investigated. The results are shown in Table 3.

[0067] Table 3 Effect of different activated carbon particle sizes on brine treatment capacity

[0068]

[0069] It can be seen from Table 3 that for wood activated carbon with the same iodine quality, the smaller the particle size, the larger the processing capacity. However, if the particle size is too small, the air velocity will be too slow. For example, when the activated carbon particle size is 50-80 mesh, its air velocity needs to be controlled at 25L / h / kg. However, if it is too small, it will affect the brine treatment efficiency. Therefore, it is better to choose an activated carbon particle size of 30-50 mesh.

[0070] 4. Effect of brine acidification on odor removal

[0071] Brines with pH=2, pH=4, pH=6, pH=7 and pH=8 were passed through activated carbon columns respectively. Wood activated carbon with an iodine value of 900 was selected, the air velocity was 30-35 L / h / kg, the particle size was 30-50 mesh, and the end point of brine deodorization was the absence of peculiar smell. The effect of brine with different pH values ​​on the activated carbon column adsorption method was investigated. The results are shown in Table 4.

[0072] Table 4 Effect of brine with different pH on the treatment capacity of activated carbon column adsorption method

[0073] Brine pH Brine treatment capacity (measured by weight ratio of brine passing through column to activated carbon loaded) pH = 2 3020 pH = 4 3000 pH = 6 1500 pH = 7 (original halogen) 500 pH=8 240

[0074] As can be seen from Table 4, the pH of the original brine is about 7. When the pH of the brine is not adjusted, the processing capacity of the activated carbon is about 500 times its own weight. When the brine is adjusted to a pH of 8, the processing capacity of the activated carbon is about 240 times its own weight, that is, as the pH increases, the processing capacity of the activated carbon decreases. When the pH of the brine decreases, the processing capacity of the activated carbon increases. The above phenomenon may be due to the fact that, on the one hand, organic acids are difficult to ionize into ions after the brine is acidified, and small organic molecules are more easily adsorbed by activated carbon. On the other hand, the surface chemical properties of activated carbon under acidic conditions are more stable and can provide more adsorption sites. When the brine is adjusted to a pH of 4, the processing capacity of the activated carbon is increased to about 3000 times its own weight, and the adsorption capacity is increased by more than 6 times, while the adsorption capacity remains basically unchanged if the pH of the brine is further reduced. In summary, the present invention chooses to adjust the pH of the brine to 3-5, thereby greatly improving the adsorption capacity of the activated carbon.

Claims

1. A deodorization method for brine acidification and synchronous aeration combined with activated carbon adsorption in refined salt production, characterized in that The steps include: S1. Add hydrochloric acid to the brine to adjust the pH of the brine to 3-5 to acidify the brine; at the same time, blow compressed air into the brine for aeration to obtain acidified aerated brine; S2. Treating acidified aerated brine using activated carbon adsorption; S3, adding sodium hydroxide and sodium carbonate to the brine treated in step S2 to remove calcium and magnesium to obtain refined brine; S4. The refined brine is evaporated, crystallized, centrifuged and dried in sequence to obtain refined salt.

2. The deodorization method of brine acidification synchronous aeration combined with activated carbon adsorption in refined salt production according to claim 1, characterized in that The steps include: S1, sending the raw halogen into the primary reaction tank to remove insoluble impurities; S2, sending the brine obtained in step S1 to a secondary reaction tank, adding hydrochloric acid to the brine in the secondary reaction tank to adjust the pH of the brine to 3-5, so as to acidify the brine; at the same time, blowing compressed air into the brine in the secondary reaction tank for aeration, so as to obtain acidified aerated brine; S3, using activated carbon adsorption method to treat acidified aerated brine; S4, sending the brine treated in step S3 to a tertiary reaction tank, adding sodium hydroxide and sodium carbonate to the tertiary reaction tank to adjust the pH of the brine to 8-10, so as to remove calcium and magnesium, and obtain refined brine; S5. The refined brine is sent to the evaporator for evaporation, and the crystallized brine mixture enters the salt slurry barrel, and then centrifuged to obtain wet salt, which is sent to the drying bed for drying to obtain refined salt.

3. The deodorization method of brine acidification, synchronous aeration and activated carbon adsorption in refined salt production according to claim 1, characterized in that: The aeration conditions are as follows: compressed air is prepared by an air compressor, and the compressed air is blown into the brine from the bottom, the pressure is 0.8-2MPa, and the aeration time is 1.5-2.5h.

4. The deodorization method of brine acidification synchronous aeration combined with activated carbon adsorption in refined salt production according to claim 1, characterized in that: The activated carbon used in the activated carbon adsorption method is wood activated carbon, and the activated carbon particle size is 30 to 50 meshes.

5. The deodorization method of brine acidification synchronous aeration combined with activated carbon adsorption in refined salt production according to claim 1, characterized in that: The activated carbon adsorption method adopts activated carbon column adsorption.

6. The deodorization method of brine acidification and synchronous aeration combined with activated carbon adsorption in refined salt production according to claim 2, characterized in that: The condition of the activated carbon column adsorption is an air velocity of 30 to 35 L / h / kg.

7. The deodorization method of brine acidification, synchronous aeration and activated carbon adsorption in refined salt production according to claim 1, characterized in that: The gas produced by the aeration method is blown into the boiler for use as fuel.

8. The deodorization method of brine acidification synchronous aeration combined with activated carbon adsorption in refined salt production according to claim 1, characterized in that: The deactivated activated carbon produced in the activated carbon adsorption process is used as boiler fuel.

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