Raw salt refining system
By introducing a water washing tank and a dehydration device into the raw salt refining treatment system, the existing process has solved the problem of harsh magnesium content in the raw salt, and the effective reduction of the raw salt impurity content and the reduction of production costs are achieved.
Patent Information
- Application Number
- CN202421476543.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-26
- Publication Date
- 2025-04-04
- Estimated Expiration
- 2034-06-26
AI Technical Summary
The existing raw salt refining process is harsh on the magnesium content in the raw salt. After the magnesium content exceeds the standard, the equipment cannot operate normally, production is limited, and the amount of refining agent cannot be accurately adjusted, resulting in poor refining effect and increasing production costs.
A raw salt purification treatment system is designed, including a water washing tank and a dehydration device. By cleaning and dehydrating the raw salt, it dissolves impurities such as magnesium and sulfate on the surface, reduces the impurity content, and reduces the amount of water use through closed circuit circulation.
It effectively reduces the impurity content in the raw salt, makes it meet industry standards, stabilizes the impurity content at a lower level, reduces the consumption of caustic soda and sodium carbonate, reduces production costs, and improves the filtrate treatment efficiency.
Smart Images
Figure CN222715108U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of raw salt refining, in particular to a raw salt refining treatment system. Background Art
[0002] Industrial caustic soda production requires a large amount of raw salt, the main impurities of which are calcium, magnesium, sulfate, etc. At present, there are two processes for the refining of primary brine, one is organic membrane filtration, and the other is inorganic membrane filtration. The organic membrane filtration process generates magnesium hydroxide precipitation by adding caustic soda to the primary brine, removes magnesium hydroxide by a pre-treatment device, and then adds sodium carbonate to generate calcium carbonate and filters it by an organic membrane filter; the inorganic membrane filtration uses a one-step method to remove calcium and magnesium, that is, caustic soda and sodium carbonate are added to the primary brine to generate magnesium hydroxide and calcium carbonate precipitation, and remove impurities by inorganic membrane filtration in one step. The above two processes are more demanding on the content of impurity magnesium in the raw salt. When the magnesium content exceeds the standard, the existing equipment cannot operate normally, and production is restricted. At the same time, the existing production process uses sodium hydroxide solution and sodium carbonate solution for impurity removal, and the increase in the content of impurity ions causes an increase in production costs. In addition, the impurity content of different raw salts varies greatly, and the amount of refining agent added cannot be accurately and effectively adjusted, resulting in the refining effect not meeting the requirements. Utility Model Content
[0003] In order to solve the above technical problems, the utility model provides a raw salt refining treatment system, which adds a water washing tank and a dehydration device, and washes the raw salt with water to dissolve impurities such as magnesium and sulfate on the surface of the raw salt, thereby reducing the impurity content in the raw salt. The filtrate is returned to the cleaning process to achieve closed-loop circulation, reduce water usage, and reduce costs.
[0004] To achieve this technical purpose, the utility model adopts the following scheme:
[0005] A raw salt refining treatment system comprises a raw salt silo, a water washing tank, a concentration tank, a reaction tank and a salt-dissolving barrel, wherein the water washing tank is connected to a dehydration device, the solid outlet of the dehydration device is connected to the salt-dissolving barrel, the liquid outlet of the dehydration device is connected to the concentration tank, an overflow port is arranged on the upper part of the concentration tank, the overflow port is connected to a circulation tank, the circulation tank is connected to the water washing tank, the circulation tank is connected to a reaction tank, the reaction tank is connected to an air dissolving tank, the air dissolving tank is connected to a pre-processor, the pre-processor is connected to a filter press, and the liquid outlets of the filter press and the pre-processor are connected to the circulation tank.
[0006] Compared with the prior art, the beneficial effects of the utility model are:
[0007] The utility model uses a washing tank and a dehydration device to wash and dehydrate the raw salt, dissolves impurities such as magnesium, sulfate, and calcium on the surface of the raw salt, reduces the impurity content in the raw salt, makes it meet the raw salt index standard of the chlor-alkali industry, and stabilizes the impurity content at a low level. The filtrate is treated with carbide slag slurry and mirabilite solution to reduce the content of impurity ions in the filtrate, and the treated filtrate is returned to the cleaning process to achieve closed-loop circulation and reduce the amount of water used. Concentrated brine is used to absorb impurities such as calcium, magnesium, and sulfate in the raw salt, and the filtrate is treated with carbide slag slurry and mirabilite solution to control the calcium, magnesium, and sulfate in the filtrate at a low level, thereby reducing the consumption of caustic soda and sodium carbonate and reducing the production cost. The filtrate after the reaction is concentrated by combining pressurized dissolved air and a pretreatment device, and filtered by a plate and frame filter press to improve the filtrate treatment efficiency.
[0008] Furthermore, the dehydration device includes a primary curved screen, a secondary curved screen and a first centrifuge connected in sequence, the liquid outlets of the primary curved screen, the secondary curved screen and the first centrifuge are connected to the concentration tank, and the solid outlet of the first centrifuge is connected to the salt tank.
[0009] Furthermore, a water washing pump is provided between the circulation tank and the water washing tank.
[0010] Furthermore, the lower outlet of the concentration tank is connected to a second centrifuge, and the second centrifuge is connected to the salt tank. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 This is a raw salt refining treatment system according to an embodiment of the utility model;
[0012] The markings in the figure are: 1. Raw salt silo; 2. Water washing tank; 3. Dehydration device; 301. Primary curved screen; 302. Secondary curved screen; 303. First centrifuge; 4. Concentration tank; 5. Circulation tank; 6. Water washing pump; 7. Reaction tank; 8. Dissolving gas tank; 9. Pretreatment device; 10. Filter press; 11. Salting barrel; 12. Second centrifuge. DETAILED DESCRIPTION
[0013] In order to fully understand the purpose, features and effects of the present invention, the present invention is described in detail through the following specific implementation methods, but the present invention is not limited thereto.
[0014] See also Figure 1The utility model provides a raw salt refining treatment system, including a raw salt silo 1, a water washing tank 2, a dehydration device 3, a concentration tank 4, a circulation tank 5, a water washing pump 6, a reaction tank 7, a dissolving tank 8, a pre-processor 9, a filter press 10 and a salting barrel 11. The water washing tank 2 is connected with the dehydration device 3, and the dehydration device 3 includes a primary curved screen 301, a secondary curved screen 302 and a first centrifuge 303 connected in sequence. The liquid outlets of the primary curved screen 301, the secondary curved screen 302 and the first centrifuge 303 are connected to the concentration tank 4, and the solid outlet of the first centrifuge 303 is connected to the salting barrel 11. An overflow port is arranged on the top of the concentration tank 4, and the overflow port is connected with a circulation tank 5, which is connected to the water washing tank 2, and a water washing pump 6 is arranged between the circulation tank 5 and the water washing tank 2. The circulation pool 5 is connected to a reaction tank 7 , the reaction tank 7 is connected to an air dissolving tank 8 , the air dissolving tank 8 is connected to a pre-processor 9 , the pre-processor 9 is connected to a filter press 10 , and the liquid outlets of the filter press 10 and the pre-processor 9 are connected to the circulation pool 5 .
[0015] The lower outlet of the concentration tank 4 is connected to a second centrifuge 12 , and the second centrifuge 12 is connected to the salt tank 11 .
[0016] The raw salt refining treatment process using the raw salt refining treatment system of the utility model is as follows:
[0017] The raw salt silo 1 is vibrated to discharge the material, and the feeding speed is adjusted by reciprocating feeding. The raw salt and saturated brine are mixed and washed in the washing tank 2, and dehydrated in turn through the first curved screen 301, the second curved screen 302 and the first centrifuge 303. After the raw salt is washed, it is transported to the salt barrel 11 by a belt. The saturated brine after washing enters the concentration tank 4. Most of the brine returns to the washing tank 2 through the washing pump 6 for circulation and washing, and a small part of the brine overflows and enters the reaction tank 7 for impurity removal. Calcium hydroxide (carbide slag slurry) and mirabilite solution are added to the saturated brine added to the reaction tank 7 to remove impurities such as magnesium ions. The liquid after the reaction enters the gas dissolving tank 8, and enters the preprocessor 9 after pressurized gas dissolution. After being concentrated by the preprocessor 9, part of the brine enters the filter press 10 for filtration. The liquid out of the preprocessor 9 and the liquid out of the filter press 10 enter the circulation tank 5 and return to the raw salt washing process.
[0018] Finally, it should be noted that the above-listed examples are only preferred embodiments of the present invention. Of course, those skilled in the art can make changes and modifications to the present invention. If these modifications and modifications fall within the scope of the claims of the present invention and their equivalent technologies, they should be considered to be within the scope of protection of the present invention.
Claims
1. A raw salt refining system, comprising a raw salt silo (1), a water washing tank (2), a concentration tank (4), a reaction tank (7) and a salting tank (11), characterized in that: The water washing tank (2) is connected to a dehydration device (3), the solid outlet of the dehydration device (3) is connected to a salting barrel (11), the liquid outlet of the dehydration device (3) is connected to a concentration tank (4), an overflow port is arranged at the top of the concentration tank (4), the overflow port is connected to a circulation tank (5), the circulation tank (5) is connected to the water washing tank (2), the circulation tank (5) is connected to a reaction tank (7), the reaction tank (7) is connected to an air dissolving tank (8), the air dissolving tank (8) is connected to a pre-processor (9), the pre-processor (9) is connected to a filter press (10), and the liquid outlets of the filter press (10) and the pre-processor (9) are connected to the circulation tank (5).
2. The raw salt refining system according to claim 1, characterized in that: The dehydration device (3) comprises a primary curved screen (301), a secondary curved screen (302) and a first centrifuge (303) which are connected in sequence; the liquid outlets of the primary curved screen (301), the secondary curved screen (302) and the first centrifuge (303) are connected to a concentration tank (4); and the solid outlet of the first centrifuge (303) is connected to a salting barrel (11).
3. The raw salt refining system according to claim 1, characterized in that: A water washing pump (6) is provided between the circulation pool (5) and the water washing tank (2).
4. The raw salt refining system according to claim 1, characterized in that: The lower outlet of the concentration tank (4) is connected to a second centrifuge (12), and the second centrifuge (12) is connected to the salt tank (11).