Acid regeneration desiliconization system without dissolving tank

Abstract

The utility model discloses an acid regeneration desiliconization system without a dissolving tank. The acid regeneration desiliconization system comprises membrane distillation equipment, a circulating tank, a heater, a cooler, a reaction tank, a flocculating agent preparation tank, a flocculating agent storage tank and a settling pond, the reaction tank is provided with an ammonia water inlet and a compressed air inlet; the membrane distillation equipment is connected with a heater, and the heater is connected with the circulating tank through a pipeline; the membrane distillation equipment is connected with the circulating tank through a pipeline, and a PH instrument is mounted on the pipeline between the membrane distillation equipment and the circulating tank; the circulating tank is connected with the cooler through a pipeline, and the cooler is connected with the reaction tank through a pipeline; the reaction tank is connected with the sedimentation tank through a pipeline, the flocculant preparation tank is connected with the flocculant storage tank through a pipeline, and the flocculant storage tank is connected to the pipeline between the reaction tank and the sedimentation tank through a pipeline. According to the utility model, the membrane distillation equipment is used for separating free acid in waste acid instead of adding broken iron bars into a dissolving tank, so that the practicability is higher.

Description

Technical Field

[0001] This utility model relates to the field of acid regeneration desilication technology, specifically an acid regeneration desilication system without a dissolution tank. Background Technology

[0002] The existing publication number CN221988302U discloses an acid regeneration desilication system. It includes a settling tank, a horizontal screw centrifuge, and a silica sludge dissolving tank. A silica sludge pipe at the bottom of the settling tank is connected to the inlet of the horizontal screw centrifuge. The solid phase outlet of the horizontal screw centrifuge is connected to a pipe in the silica sludge dissolving tank, and the liquid phase outlet pipe of the horizontal screw centrifuge is connected to the inlet of the settling tank. This invention, by using a horizontal screw centrifuge in conjunction with a settling tank, can effectively dewater silica sludge. Furthermore, the hardness and size of the dewatered silica sludge can be controlled by adjusting the speed of the horizontal screw centrifuge. The silica sludge processed by the horizontal screw centrifuge is easy to further process without the need for crushing.

[0003] Existing technologies have several problems: Traditional desilication systems require large dissolution tanks. For example, a desilication system with a processing capacity of 8 m³ / h requires a dissolution tank with a volume of 150-200 m³, necessitating storage space around it for scrap iron bars and the addition of electric hoists for these scraps. This results in a large footprint and significant investment. The dissolution tank needs to contain scrap carbon steel bars with a silicon content of less than 0.1% to neutralize free acid in the waste acid. For an 8 m³ / h system, the annual demand is typically around 2,000 tons, leading to high procurement costs and the need for vehicle transport, which incurs significant transportation expenses. Furthermore, a stable supply of scrap iron bars is crucial; any delays will jeopardize the system's normal operation. In terms of safety, the reaction between waste acid and scrap iron bars in the dissolution tank generates a large amount of hydrogen gas, posing a risk of explosion and fire. Utility Model Content

[0004] The purpose of this invention is to provide an acid regeneration desilication system without a dissolution tank to solve the problems in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an acid regeneration desilication system without a dissolving tank, comprising a membrane distillation device, a circulation tank, a heater, a cooler, a reaction tank, a flocculant preparation tank, a flocculant storage tank, and a sedimentation tank; the reaction tank is provided with an ammonia inlet and a compressed air inlet; the membrane distillation device is connected to the heater, and the heater is connected to the circulation tank via a pipeline; the membrane distillation device is connected to the circulation tank via a pipeline, and a pH meter is installed on the pipeline between the membrane distillation device and the circulation tank; the circulation tank is connected to the cooler via a pipeline, and the cooler is connected to the reaction tank via a pipeline; the reaction tank is connected to the sedimentation tank via a pipeline; the flocculant preparation tank is connected to the flocculant storage tank via a pipeline, and the flocculant storage tank is connected to the pipeline between the reaction tank and the sedimentation tank via a pipeline.

[0006] Preferably, the system also includes a filter press and a cake silo. The cake silo is located below the filter press. The sedimentation tank is connected to the filter press via a pipeline. A slurry pump is installed on the pipeline between the sedimentation tank and the filter press.

[0007] Preferably, a flocculant weighing pump is installed on the pipeline of the flocculant storage tank.

[0008] Preferably, an iron ion detector is also installed on the pipeline between the membrane distillation equipment and the circulation tank.

[0009] Preferably, the device also includes a dilute acid collection tank, the membrane distillation equipment being connected to the dilute acid collection tank via a pipeline, and the dilute acid collection tank being connected to a dilute acid pump.

[0010] Preferably, the system also includes a condensate collection tank, which is connected to the heater via a pipe and to a circulation tank via a pipe. A condensate pump is installed on the pipe between the condensate collection tank and the circulation tank.

[0011] Preferably, a circulation pump is installed on the pipeline between the circulation tank and the heater.

[0012] Preferably, a circulation pump is installed on the pipeline between the circulation tank and the cooler, and the circulation tank is provided with a waste acid inlet.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] Using membrane distillation equipment to separate free acid from waste acid is a more practical solution than adding crushed iron bars to the dissolving tank, especially for companies that cannot supply sufficient quantities of qualified crushed iron bars to ensure the normal operation of the desiliconization system.

[0015] The acid-containing condensate produced by the membrane distillation equipment can be used as spray water in the acid regeneration absorption tower to produce regenerated acid. The condensate and HCl in it are recycled and reused, with no waste discharge.

[0016] No hydrogen is generated during the operation, eliminating the risk of fire and explosion.

[0017] It eliminates the need for neutralization tanks and auxiliary equipment, saving storage space and transportation costs for scrap iron bars. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] In the diagram: 1. Membrane distillation equipment; 2. Circulation tank; 3. Circulation pump; 4. Heater; 5. Iron ion detector; 6. pH meter; 7. Condensate collection tank; 8. Condensate pump; 9. Dilute acid collection tank; 10. Dilute acid pump; 11. Waste acid pump; 12. Cooler; 13. Reaction tank; 14. Flocculant preparation tank; 15. Flocculant storage tank; 16. Flocculant weighing pump; 17. Sedimentation tank; 18. Slurry pump; 19. Filter press; 20. Cake silo. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to represent selected embodiments of this utility model.

[0022] Please see Figure 1 In this embodiment of the present invention, an acid regeneration desilication system without a dissolving tank includes a membrane distillation device 1, a circulation tank 2, a heater 4, a cooler 12, a reaction tank 13, a flocculant preparation tank 14, a flocculant storage tank 15, and a sedimentation tank 17.

[0023] The reaction vessel 13 is equipped with an ammonia inlet and a compressed air inlet;

[0024] The membrane distillation equipment 1 is connected to a heater 4, which is connected to a circulation tank 2 via a pipe. A circulation pump 3 is installed on the pipe between the circulation tank 2 and the heater 4.

[0025] The membrane distillation device 1 is connected to the circulation tank 2 via a pipeline. A pH meter 6 is installed on the pipeline between the membrane distillation device 1 and the circulation tank 2. An iron ion detector 5 is also installed on the pipeline between the membrane distillation device 1 and the circulation tank 2.

[0026] The circulating tank 2 is connected to the cooler 12 via a pipe, and the cooler 12 is connected to the reaction tank 13 via a pipe; a waste acid pump 11 is installed on the pipe between the circulating tank 2 and the cooler 12, and the circulating tank 2 is provided with a waste acid inlet;

[0027] The reaction tank 13 is connected to the sedimentation tank 17 via a pipeline, the flocculant preparation tank 14 is connected to the flocculant storage tank 15 via a pipeline, the flocculant storage tank 15 is connected to the pipeline between the reaction tank 13 and the sedimentation tank 17 via a pipeline, and a flocculant weighing pump 16 is installed on the pipeline of the flocculant storage tank 15.

[0028] It also includes a filter press 19 and a cake hopper 20. The cake hopper 20 is located below the filter press 19. The sedimentation tank 17 is connected to the filter press 19 through a pipe. A mud pump 18 is installed on the pipe between the sedimentation tank 17 and the filter press 19.

[0029] It also includes a dilute acid collection tank 9, the membrane distillation device 1 is connected to the dilute acid collection tank 9 through a pipe, and the dilute acid collection tank 9 is connected to a dilute acid pump 10.

[0030] It also includes a condensate collection tank 7, which is connected to the heater 4 via a pipe. The condensate collection tank 7 is also connected to the circulation tank 2 via a pipe. A condensate pump 8 is installed on the pipe between the condensate collection tank 7 and the circulation tank 2.

[0031] The working principle of this invention is as follows: a membrane distillation device is used to replace the neutralization tank to separate free acid from waste acid, as shown in the figure below. Waste acid from the acid regeneration waste acid tank is quantitatively injected into the waste acid circulation tank 2. The circulation pump 3 heats the waste acid through the heater 4 (steam heating) and then pumps it into the membrane distillation device 1. The heating temperature is set to 65℃ (adjustable). The condensate generated by the heater is collected in the condensate collection tank 7 and used to adjust the pH value and iron ion concentration of the waste acid in the circulation tank. The waste acid evaporates in the membrane distillation device. The water vapor carries HCl through the membrane into the cooling chamber, where it condenses into dilute hydrochloric acid, which enters the dilute acid collection tank 9 and is used as spray water in the absorption tower of the acid regeneration system to produce regenerated acid. Because the waste acid in the circulation tank is concentrated and evaporated, the total amount of free acid decreases, and the Fe2+ concentration increases. By adding condensate, the pH value of the solution is controlled to be around 1 (measured by a pH meter), and the Fe2+ concentration is controlled to be between 135-145 g / L (measured by an iron ion meter). After the indicators meet the standards, the waste acid is pumped by the waste acid pump through the cooler into the desilication system. Subsequent operations are carried out according to the traditional desilication mode.

[0032] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the 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 this utility model should be included within the protection scope of this utility model.

Claims

1. An acid regeneration desilication system without a dissolution tank, characterized in that: It includes a membrane distillation unit (1), a circulation tank (2), a heater (4), a cooler (12), a reaction tank (13), a flocculant preparation tank (14), a flocculant storage tank (15), and a sedimentation tank (17). The reaction vessel (13) is equipped with an ammonia inlet and a compressed air inlet; The membrane distillation apparatus (1) is connected to a heater (4), which is connected to a circulation tank (2) via a pipe; The membrane distillation equipment (1) is connected to the circulation tank (2) via a pipeline, and a pH meter (6) is installed on the pipeline between the membrane distillation equipment (1) and the circulation tank (2). The circulating tank (2) is connected to the cooler (12) via a pipe, and the cooler (12) is connected to the reaction tank (13) via a pipe; The reaction tank (13) is connected to the sedimentation tank (17) via a pipe, the flocculant preparation tank (14) is connected to the flocculant storage tank (15) via a pipe, and the flocculant storage tank (15) is connected to the pipe between the reaction tank (13) and the sedimentation tank (17) via a pipe.

2. The acid regeneration and desilication system without a dissolution tank according to claim 1, characterized in that: It also includes a filter press (19) and a cake hopper (20). The cake hopper (20) is located below the filter press (19). The sedimentation tank (17) is connected to the filter press (19) through a pipe. A mud pump (18) is installed on the pipe between the sedimentation tank (17) and the filter press (19).

3. The acid regeneration and desilication system without a dissolution tank according to claim 1, characterized in that: A flocculant weighing pump (16) is installed on the pipeline of the flocculant storage tank (15).

4. The acid regeneration and desilication system without a dissolution tank according to claim 1, characterized in that: An iron ion detector (5) is also installed on the pipeline between the membrane distillation equipment (1) and the circulation tank (2).

5. The acid regeneration and desilication system without a dissolution tank according to claim 1, characterized in that: It also includes a dilute acid collection tank (9), the membrane distillation equipment (1) is connected to the dilute acid collection tank (9) via a pipe, and the dilute acid collection tank (9) is connected to a dilute acid pump (10).

6. The acid regeneration and desilication system without a dissolution tank according to claim 1, characterized in that: It also includes a condensate collection tank (7), which is connected to the heater (4) via a pipe. The condensate collection tank (7) is also connected to the circulation tank (2) via a pipe. A condensate pump (8) is installed on the pipe between the condensate collection tank (7) and the circulation tank (2).

7. The acid regeneration and desilication system without a dissolution tank according to claim 1, characterized in that: A circulation pump (3) is installed on the pipeline between the circulation tank (2) and the heater (4).

8. The acid regeneration and desilication system without a dissolution tank according to claim 1, characterized in that: A waste acid pump (11) is installed on the pipeline between the circulation tank (2) and the cooler (12), and the circulation tank (2) is provided with a waste acid inlet.

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