Dilute sulfuric acid filtering and recycling system

Abstract

The utility model discloses a dilute sulphuric acid filtering and recycling system, and relates to the technical field of dilute sulphuric acid recycling. The device comprises an acid liquor filter, a transfer tank and a dilution tank which are arranged in sequence, a first drainage pump is arranged outside the acid liquor filter; a liquid inlet of the first drainage pump is communicated with a dilute acid introduction pipe, and a liquid outlet of the first drainage pump is communicated with a liquid inlet of the acid liquid filter through a first liquid guide pipe; a liquid outlet of the acid liquid filter is communicated with the transfer tank through a second liquid guide pipe; a second drainage pump is arranged outside the transfer groove; a liquid inlet of the second drainage pump is communicated with the transfer tank through a third liquid guide pipe; a liquid outlet of the second drainage pump is communicated with the dilution tank through a fourth liquid guide pipe; the upper end of the dilution tank is also communicated with a circulating water introduction pipe and a raffinate acid introduction pipe; the lower end of the dilution tank communicates with a discharge pipe. The device has the beneficial effects that the problem of the destination of the dilute acid can be solved, the sulfuric acid in the dilute acid is effectively utilized, the normal production of the sulfuric acid process is stabilized, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of dilute sulfuric acid reuse, in particular to a dilute sulfuric acid filtration and reuse system. Background Art

[0002] A large amount of dilute acid is generated every day in the purification process of the vulcanization workshop for use in the extraction process of the new fertilizer workshop. Since the dilute acid contains a certain amount of impurities, the extraction process is not convenient to apply. Therefore, at the current stage, when the purified phosphoric acid project is started, usually the extraction process no longer uses dilute acid, and the destination problem of the dilute acid will restrict the normal production of the sulfuric acid plant. Therefore, how to solve the destination problem of the dilute acid and how to effectively utilize the sulfuric acid in the dilute acid are problems that need to be solved urgently. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a dilute sulfuric acid filtration and reuse system aiming at the above-mentioned existing technical deficiencies, which can solve the destination problem of dilute acid, effectively utilize the sulfuric acid in the dilute acid, stabilize the normal production of the sulfuric acid process, and reduce the production cost.

[0004] The technical solution adopted by the utility model is: to provide a dilute sulfuric acid filtration and reuse system, which includes an acid liquid filter, a transfer tank and a dilution tank arranged in sequence; a first drainage pump is arranged outside the acid liquid filter; the liquid inlet of the first drainage pump is communicated with a dilute acid introduction pipe, and the liquid outlet of the first drainage pump is communicated with the liquid inlet of the acid liquid filter through a first liquid guide pipe; the liquid outlet of the acid liquid filter is communicated with the transfer tank through a second liquid guide pipe; a second drainage pump is arranged outside the transfer tank; the liquid inlet of the second drainage pump is communicated with the transfer tank through a third liquid guide pipe; the liquid outlet of the second drainage pump is communicated with the dilution tank through a fourth liquid guide pipe; a circulating water introduction pipe and a raffinate acid introduction pipe are also communicated with the upper end of the dilution tank; a discharge pipe is communicated with the lower end of the dilution tank; a first valve is correspondingly installed on the discharge pipe.

[0005] To further optimize the technical solution, a sampling pipe is communicated with the lower part of the side wall of the dilution tank of a dilute sulfuric acid filtration and reuse system; a second valve is correspondingly installed on the sampling pipe.

[0006] To further optimize the technical solution, a liquid level gauge is fixedly installed on the side part of the dilution tank of a dilute sulfuric acid filtration and reuse system.

[0007] The beneficial effects of the utility model are as follows:

[0008] The acid liquid filter can filter out impurities from the dilute acid generated in the vulcanization workshop, improving the purity and cleanliness of the acid liquid. The filtered acid liquid can be stored by introducing it into a transfer tank; during the production of the purified phosphoric acid project, raffinate acid with a certain concentration is generated. The raffinate acid is introduced into the dilution tank through the raffinate acid inlet pipe. The filtered acid liquid can be introduced into the dilution tank by the second drainage pump. By combining with the circulating water inlet pipe to introduce circulating water, the acid liquid in the vulcanization workshop can be effectively utilized, so that after being mixed with the raffinate acid and diluted, it can be conveniently used to produce mixed acid. Brief Description of the Drawings

[0009] Figure 1 is a schematic structural diagram of the present invention;

[0010] In the figure, 1. acid liquid filter; 2. transfer tank; 3. dilution tank; 4. first drainage pump; 5. dilute acid inlet pipe; 6. first liquid guide pipe; 7. second liquid guide pipe; 8. second drainage pump; 9. third liquid guide pipe; 10. fourth liquid guide pipe; 11. circulating water inlet pipe; 12. raffinate acid inlet pipe; 13. discharge pipe; 14. first valve; 15. sampling pipe; 16. second valve; 17. liquid level gauge. Detailed Description of the Preferred Embodiment

[0011] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0012] As Figure 1 shown, a dilute sulfuric acid filtration and reuse system includes an acid liquid filter 1, a transfer tank 2, and a dilution tank 3 arranged in sequence; a first drainage pump 4 is arranged outside the acid liquid filter 1; the liquid inlet of the first drainage pump 4 is connected to a dilute acid inlet pipe 5, and the liquid outlet of the first drainage pump 4 is connected to the liquid inlet of the acid liquid filter 1 through a first liquid guide pipe 6; the liquid outlet of the acid liquid filter 1 is connected to the transfer tank 2 through a second liquid guide pipe 7; a second drainage pump 8 is arranged outside the transfer tank 2; the liquid inlet of the second drainage pump 8 is connected to the transfer tank 2 through a third liquid guide pipe 9; the liquid outlet of the second drainage pump 8 is connected to the dilution tank 3 through a fourth liquid guide pipe 10; a circulating water inlet pipe 11 and a raffinate acid inlet pipe 12 are further connected to the upper end of the dilution tank 3; a discharge pipe 13 is connected to the lower end of the dilution tank 3; a first valve 14 is correspondingly installed on the discharge pipe 13.

[0013] The purified phosphoric acid project usually generates raffinate acid with a concentration of about 35%. These raffinate acids are usually supplied to the conversion process of the sulfur-based fertilizer section for producing mixed acid, and then the mixed acid is used to produce compound fertilizer. Therefore, the large amount of dilute acid generated daily in the purification process of the vulcanization workshop is just used to mix with the raffinate acid, providing convenience for the production of mixed acid. It not only solves the problem of the destination of the dilute acid, especially effectively and conveniently utilizes the sulfuric acid in the dilute acid (usually the dilute sulfuric acid component in the dilute acid is the most difficult to handle), avoids the normal production of the sulfuric acid plant being restricted by the problem of the destination of the dilute acid, and reduces the production cost.

[0014] Since the dilute acid produced in the purification process of the vulcanization workshop usually contains a certain amount of impurities in addition to the acid liquid components, in this technical solution, before using the dilute acid, the initial acid liquid is introduced into the acid liquid filter 1 by the first drainage pump 4 to filter and remove the impurities in the dilute acid, improve the purity and cleanliness of the acid liquid, and then store it in the transfer tank 2. After that, the dilute acid stored in the transfer tank 2 is introduced into the dilution tank 3 by the second drainage pump 8, and circulating water and raffinate acid generated from the purified phosphoric acid project are respectively introduced through the circulating water inlet pipe 11 and the raffinate acid inlet pipe 12. By mixing and diluting with the dilute acid, the concentration of the mixed acid liquid is reduced to 21% (the suitable concentration for producing mixed acid) in the dilution tank 3, and then the acid liquid is discharged into the conversion process through the discharge pipe 13, so that mixed acid can be conveniently produced.

[0015] As Figure 1 shown, a sampling pipe 15 is connected to the lower part of the side wall of the dilution tank 3; a second valve 16 is correspondingly installed on the sampling pipe 15. By opening the second valve 16, it is convenient to use the sampling pipe 15 to sample the mixed acid liquid in the dilution tank 3, so as to analyze and detect the concentration of the acid liquid, and facilitate determining the addition amounts of raffinate acid, circulating water and filtered dilute acid to meet the requirement that the concentration of the mixed acid liquid is reduced to about 21%.

[0016] As Figure 1 shown, a liquid level gauge 17 is fixedly installed on the side of the dilution tank 3. Through the liquid level gauge 17, it is convenient to monitor the liquid volume in the dilution tank 3, enabling the staff to clearly observe the injection amounts of various liquids, facilitating the control of the addition ratio of the mixed liquid, and avoiding the danger caused by excessive addition of acid liquid.

[0017] It can be understood that the present utility model is described by some embodiments. Those skilled in the art know that without departing from the spirit and scope of the present utility model, various changes or equivalent replacements can be made to these features and embodiments. Additionally, under the teaching of the present utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present utility model.

Claims

1. A dilute sulfuric acid filtration and reuse system, characterized in that: It includes an acid solution filter (1), a transfer tank (2) and a dilution tank (3) arranged in sequence; a first drainage pump (4) is arranged outside the acid solution filter (1); the liquid inlet of the first drainage pump (4) is communicated with a dilute acid introduction pipe (5), and the liquid outlet of the first drainage pump (4) is communicated with the liquid inlet of the acid solution filter (1) through a first liquid guide pipe (6); the liquid outlet of the acid solution filter (1) is communicated with the transfer tank (2) through a second liquid guide pipe (7); a second drainage pump (8) is arranged outside the transfer tank (2); the liquid inlet of the second drainage pump (8) is communicated with the transfer tank (2) through a third liquid guide pipe (9); the liquid outlet of the second drainage pump (8) is communicated with the dilution tank (3) through a fourth liquid guide pipe (10); a circulating water introduction pipe (11) and a raffinate acid introduction pipe (12) are also communicated with the upper end of the dilution tank (3); a discharge pipe (13) is communicated with the lower end of the dilution tank (3); a first valve (14) is correspondingly installed on the discharge pipe (13).

2. The dilute sulfuric acid filtration and reuse system according to claim 1, wherein: A sampling pipe (15) is communicated with the lower part of the side wall of the dilution tank (3); a second valve (16) is correspondingly installed on the sampling pipe (15).

3. A dilute sulfuric acid filtration and reuse system according to claim 1, characterized in that: A liquid level gauge (17) is fixedly installed on the side of the dilution tank (3).

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