A bicarbonate crystal production device
By optimizing the sodium bicarbonate crystallization process through cooling precipitation and common ion effect precipitation methods, the problem of excessive sodium bicarbonate supersaturation in the carbonization tower was solved, the efficiency of mother liquor recycling and the purity of raw materials were improved, the crystallization quality was enhanced, and the production cost was reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG HAITIAN BIO-CHEM CO LTD
- Filing Date
- 2025-04-30
- Publication Date
- 2026-05-29
AI Technical Summary
In existing sodium bicarbonate production processes, excessive supersaturation of sodium bicarbonate in the carbonation tower leads to the formation of fine crystals and material leakage in the centrifuge, affecting crystallization quality and increasing costs. Furthermore, existing methods for reducing supersaturation are limited and costly in food-grade and feed-grade production.
The raw materials are processed through a cooling precipitation and common ion effect precipitation method, using a alkali tank, a clarification tank and a PE filter. A thickener is used to increase the solid content of the alkali solution and reduce the temperature of the mother liquor. Seawater cooling is combined to control the precipitation of sodium bicarbonate and optimize the carbonation crystallization process.
This improved the efficiency of mother liquor recycling, ensured the purity of raw materials, enhanced the quality of sodium bicarbonate crystals, reduced production costs, and achieved energy conservation and consumption reduction.
Smart Images
Figure CN224293224U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of sodium bicarbonate crystallization production equipment, and discloses a sodium bicarbonate crystallization production equipment. Background Technology
[0002] In the field of sodium bicarbonate production, existing first-line sodium bicarbonate plants use steam to heat mother liquor to dissolve raw materials such as light soda ash, substandard soda ash, and alkali that has fallen into the ground. The resulting alkali solution is then treated and reacted with carbon dioxide in a carbonation tower to produce sodium bicarbonate crystals. After thickening, centrifugation, and drying, sodium bicarbonate product is obtained, and the mother liquor is recycled. However, this production process has many technical challenges.
[0003] The supersaturation of sodium bicarbonate in the carbonation tower is a core factor affecting crystallization quality. Excessive supersaturation easily produces a large number of fine crystals, interfering with the carbonation and centrifugation processes, and even causing material leakage from the centrifuge, resulting in raw material waste and environmental pollution. Theoretically, production can operate normally when the supersaturation S ≤ 1.7, and reducing the sodium bicarbonate content in the tower is key to controlling supersaturation. Currently, the commonly used method of adding sodium hydroxide solution to the mother liquor and alkali solution to reduce the sodium bicarbonate content is only suitable for industrial-grade sodium bicarbonate production, and is limited in food-grade and feed-grade sodium bicarbonate production, and is also costly.
[0004] This utility model discloses a sodium bicarbonate crystallization production equipment, which adopts methods such as cooling precipitation and common ion effect precipitation, aiming to improve the quality of sodium bicarbonate carbonization crystallization, achieve energy saving and consumption reduction, reduce production costs, and promote the upgrading of sodium bicarbonate production technology. Utility Model Content
[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a sodium bicarbonate crystallization production device.
[0006] To achieve the above objectives, the present invention adopts the following technical solution: a sodium bicarbonate crystallization production device, including an alkali-dissolving tank, a clarification tank connected to one side of the alkali-dissolving tank, and a PE filter connected to the side of the clarification tank away from the alkali-dissolving tank for filtration;
[0007] The end of the PE filter furthest from the clarification tank is connected to a reaction carbonization tower, and a thickener is arranged on one side of the reaction carbonization tower.
[0008] As a further description of the above technical solution:
[0009] The reaction carbonization tower is equipped with an exhaust port at the top for discharging exhaust gas.
[0010] As a further description of the above technical solution:
[0011] A centrifuge is located below the thickener, and a mother liquor tank is connected to the end of the centrifuge away from the thickener for holding the mother liquor.
[0012] As a further description of the above technical solution:
[0013] The thickener is provided in two sets, and one set is arranged on one side of the reaction carbonization tower to settle the carbonized alkaline solution, thereby increasing the solid content of the alkaline solution.
[0014] The thickener arranged on one side of the mother liquor tank is used to cool the mother liquor.
[0015] As a further description of the above technical solution:
[0016] A dryer is connected to the bottom of the centrifuge for drying, and a cooling package is fixedly connected to the side of the dryer away from the centrifuge for packaging.
[0017] As a further description of the above technical solution:
[0018] The alkali-forming tank is connected to the thickener and the mother liquor tank via pipes, and the clarification tank is connected to the thickener via pipes.
[0019] This utility model has the following beneficial effects:
[0020] 1. Improve the recycling efficiency of mother liquor. A portion of the mother liquor is introduced into a thickener, and soda ash is added. The cooling effect of seawater and the common ion effect cause NaHCO3 to precipitate. By studying the influence of cooling on the amount of NaHCO3 precipitated, the precipitation process of sodium bicarbonate in the mother liquor can be precisely controlled.
[0021] 2. The raw materials are processed sequentially by the alkali dissolving tank, the clarification tank, and the PE filter. The alkali dissolving tank dissolves the raw materials, the clarification tank initially precipitates impurities, and the PE filter performs fine filtration to effectively remove various impurities from the raw materials, ensuring the purity of the solution entering the reaction carbonization tower and creating favorable conditions for subsequent reactions and crystallization. Attached Figure Description
[0022] Figure 1 This is an overall flow chart of a sodium bicarbonate crystallization production equipment proposed in this utility model.
[0023] Legend: 1. Alkali tank; 2. Clarifying tank; 3. PE filter; 4. Reaction carbonization tower; 5. Thickener; 6. Centrifuge; 7. Mother liquor tank; 8. Dryer; 9. Cooling and packaging. Detailed Implementation
[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0025] Example 1:
[0026] like Figure 1 As shown, this embodiment provides a sodium bicarbonate crystallization production equipment, including: an alkali-dissolving tank 1, a clarification tank 2 connected to one side of the alkali-dissolving tank 1, a PE filter 3 connected to the side of the clarification tank 2 away from the alkali-dissolving tank 1 for filtration; a reaction carbonization tower 4 connected to the end of the PE filter 3 away from the clarification tank 2, and a thickener 5 arranged on one side of the reaction carbonization tower 4.
[0027] In this embodiment, in the alkali-forming tank 1, raw materials such as soda ash are made into alkali solution. The alkali solution flows into the clarification tank 2 for clarification treatment to remove larger particulate impurities, etc., and then enters the PE filter 3 for further filtration. The filtered alkali solution enters the reaction carbonization tower 4 and undergoes a carbonization reaction with the introduced CO2 gas to generate sodium bicarbonate crystals. Through the treatment of alkali-forming tank 1, clarification tank 2 and PE filter 3, a relatively pure alkali solution is obtained and enters the reaction carbonization tower 4, providing good raw material conditions for the subsequent carbonization reaction.
[0028] Specifically, the reaction carbonization tower 4 is provided with an exhaust port at the top for discharging exhaust gas.
[0029] In this embodiment, tail gas is generated during the carbonization reaction inside the reaction carbonization tower 4. The tail gas is discharged outside the tower through the exhaust port to maintain the stability of the reaction environment inside the reaction carbonization tower 4.
[0030] Specifically, a centrifuge 6 is provided below the thickener 5, and a mother liquor tank 7 is connected to the end of the centrifuge 6 away from the thickener 5 for holding the mother liquor generated by centrifugation.
[0031] In a preferred embodiment, the sodium bicarbonate crystals generated in the reaction carbonization tower 4 are concentrated in the thickener 5 and then separated into solid and liquid in the centrifuge 6. The separated mother liquor is then transferred to the mother liquor tank 7.
[0032] Specifically, the thickener 5 is provided in two sets, and one set of thickener 5 is arranged on one side of the reaction carbonization tower 4, which is used to settle the carbonized alkaline solution and thereby increase the solid content of the alkaline solution; the thickener 5 arranged on one side of the mother liquor tank 7 is used to cool the mother liquor.
[0033] It should be noted that by using the two sets of thickeners 5, the solid content of the alkali solution is increased and sodium bicarbonate in the mother liquor is crystallized out, which is beneficial to increasing the production of sodium bicarbonate and reducing the sodium bicarbonate content in the mother liquor.
[0034] Specifically, a dryer 8 is connected below the centrifuge 6 for drying, and a cooling package 9 is fixedly connected to the side of the dryer 8 away from the centrifuge 6 for packaging.
[0035] In a preferred embodiment, the baking soda crystals separated by centrifuge 6 enter dryer 8 and are dried in parallel flow with hot air. The dried baking soda then enters cooling packaging 9 for cooling and packaging.
[0036] Specifically, the alkali-forming tank 1 is connected to the thickener 5 and the mother liquor tank 7 via pipes, and the clarification tank 2 is connected to the thickener 5 via pipes.
[0037] It should be noted that the alkali solution in the alkali tank 1 can be transported to the thickener 5 through pipeline to participate in subsequent reactions, or it can be transported to the mother liquor tank 7 for blending and other operations. The alkali solution in the clarification tank 2 can be transported to the thickener 5 through pipeline to be mixed with other materials for processing.
[0038] In operation, the sodium bicarbonate crystallization production equipment prepares an alkaline solution from raw materials such as soda ash in the alkali-forming tank 1. This solution flows into the clarifying tank 2 for initial sedimentation of impurities, and then undergoes fine filtration through the PE filter 3 before entering the reaction carbonization tower 4. Inside the reaction carbonization tower, the alkaline solution reacts with introduced CO2 to form sodium bicarbonate crystals, and the resulting exhaust gas is discharged through the exhaust vent at the top of the tower. The formed sodium bicarbonate crystals enter the thickener 5 for concentration. Two sets of thickeners are arranged on both sides of the mother liquor tank 7, respectively used to increase the solid content of the alkali solution and to cool the mother liquor. After concentration, the solution enters the centrifuge 6 for solid-liquid separation. The mother liquor flows into the mother liquor tank 7, and the mother liquor in the mother liquor tank 7 is sent to the thickener 5, where seawater can be used for cooling to precipitate NaHCO3.
[0039] After separation, the sodium bicarbonate crystals enter the dryer 8 and are dried in parallel flow with hot air. After drying, they enter the cooling and packaging 9, where they are cooled and then packaged to obtain the finished product.
[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A sodium bicarbonate crystallization production device, characterized in that: It includes an alkali-refining tank (1), a clarification tank (2) connected to one side of the alkali-refining tank (1), and a PE filter (3) connected to the side of the clarification tank (2) away from the alkali-refining tank (1) for filtration; The PE filter (3) is connected to a reaction carbonization tower (4) at the end away from the clarification tank (2), and a thickener (5) is arranged on one side of the reaction carbonization tower (4).
2. The sodium bicarbonate crystallization production equipment according to claim 1, characterized in that: The reaction carbonization tower (4) is provided with an exhaust port above it for discharging exhaust gas.
3. The sodium bicarbonate crystallization production equipment according to claim 2, characterized in that: A centrifuge (6) is provided below the thickener (5), and a mother liquor tank (7) is connected to the end of the centrifuge (6) away from the thickener (5) for holding the mother liquor obtained after centrifugal solid-liquid separation.
4. The sodium bicarbonate crystallization production equipment according to claim 3, characterized in that: The thickener (5) is provided in two sets, and one set of thickener (5) is arranged on one side of the reaction carbonization tower (4) for settling the carbonized alkaline solution, thereby increasing the solid content of the alkaline solution. The thickener (5) arranged on one side of the mother liquor tank (7) is used to cool the mother liquor.
5. The sodium bicarbonate crystallization production equipment according to claim 4, characterized in that: A dryer (8) is connected below the centrifuge (6) for drying, and a cooling package (9) is fixedly connected to the side of the dryer (8) away from the centrifuge (6) for packaging.
6. The sodium bicarbonate crystallization production equipment according to claim 5, characterized in that: The alkali tank (1) is connected to the thickener (5) and the mother liquor tank (7) through a pipe, and the clarifier tank (2) is connected to the thickener (5) through a pipe.