Sulfuric acid recycling system

Abstract

The utility model relates to the technical field of humic acid production, in particular to a sulfuric acid recycling system. The sulfuric acid recycling system comprises a concentrated sulfuric acid storage tank, a purified water storage tank, a premixing tank and an activation kettle, the concentrated sulfuric acid storage tank is connected with the activation kettle through an acid liquor preparation tank, the premixing tank is connected with the activation kettle through an inclined material guide pipeline, and the activation kettle is connected with the premixing tank through a primary filter. The inclined material guide pipeline is connected with a waste acid liquid storage tank through a waste acid liquid temporary storage tank, and a purified water storage tank is connected with an acid liquid preparation tank through a preparation tank feeding pump. According to the system, through the arrangement of the primary filter and the premixing tank, acid liquor used by the activation kettle is introduced into the premixing tank, and humic acid is subjected to pre-acidification treatment, so that the utilization efficiency of sulfuric acid is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of humic acid production, in particular to a sulfuric acid recycling system. Background Art

[0002] Humic acid is a natural organic substance with good biological activity, adsorption, ion exchange, flocculation and other properties. In the production process of humic acid, sulfuric acid, as an important raw material, is widely used in the extraction and activation of humic acid. However, in the traditional humic acid production process, sulfuric acid is often used once and is discharged after use, which not only wastes resources but also may pollute the environment.

[0003] Chinese patent application CN218290684U, published on 2023.01.13. A device for recovering an acid-containing filtrate is disclosed. The device for recovering an acid-containing filtrate comprises a filtrate tank, the filtrate tank is connected to a primary filter through a primary circulation tank, the primary filter is connected to a secondary circulation tank through a pre-storage tank, the secondary circulation tank is connected to a temporary storage tank through a secondary filter, the temporary storage tank is connected to a storage tank, the outlet of the primary circulation tank is connected to the inlet of the primary filter through a pipeline entering the primary filter, the outlet below the primary filter is connected to the primary circulation tank through a pipeline returning to the primary circulation tank, and the circulating filtration of the solution in the primary circulation tank and the primary filter is realized through a pipeline entering the primary filter and a pipeline returning to the primary circulation tank. Although the acid-containing filtrate is recovered, it is found in subsequent production that due to the different concentrations of the acid-containing filtrate, one-time centralized treatment is not conducive to the reuse of the acid solution, and the utilization rate of the acid solution is significantly reduced.

[0004] In summary, although the existing device can recycle sulfuric acid, it has the problems of low recycling rate and incomplete acid utilization. Utility Model Content

[0005] In view of the above deficiencies in the prior art, the purpose of the utility model is to provide a sulfuric acid recycling system. By setting a preliminary filter and a premixing tank, the acid liquid after use in the activation kettle is passed into the premixing tank to pre-acidify the humic acid, thereby greatly improving the utilization efficiency of sulfuric acid; by setting a waste acid liquid temporary storage tank, a primary filter and a waste acid liquid storage tank, the waste acid liquid after production is filtered and recovered, and the waste acid liquid after treatment is mixed with concentrated sulfuric acid in an acid liquid preparation tank and then enters the activation kettle again for production, thereby greatly improving the recycling rate of sulfuric acid.

[0006] The utility model is realized by adopting the following technical solutions:

[0007] The sulfuric acid recycling system comprises a concentrated sulfuric acid storage tank, a pure water storage tank, a premixing tank and an activation kettle. The concentrated sulfuric acid storage tank is connected to the activation kettle through an acid liquid preparation tank, the premixing tank is connected to the activation kettle through an inclined material guide pipe, the activation kettle is connected to the premixing tank through a preliminary filter, the inclined material guide pipe is connected to the waste acid liquid storage tank through a waste acid liquid temporary storage tank, and the pure water storage tank is connected to the acid liquid preparation tank through a preparation tank feed pump.

[0008] The premixing tank is used to premix humic acid and the acid in the preliminary filter to improve the activation efficiency; the waste acid storage tank is used to store the waste acid; and the acid preparation tank is used to dilute the concentrated sulfuric acid.

[0009] A sulfuric acid feed pump is arranged between the concentrated sulfuric acid storage tank and the acid solution preparation tank, a stirring paddle is arranged inside the acid solution preparation tank, and a liquid level meter is arranged outside the vertical wall of the acid solution preparation tank.

[0010] The premixing tank is provided with a solid phase feed port, the activation kettle is provided with a spray, the acid solution preparation tank is connected to the spray plate through a pipeline, and the connection point between the sulfuric acid feed pump and the acid solution preparation tank is located on the vertical wall of the acid solution preparation tank.

[0011] The inclined material guiding pipeline is connected to the waste acid liquid temporary storage tank through a solid-liquid separation filter, and a primary filter is arranged between the waste acid liquid temporary storage tank and the waste acid liquid storage tank.

[0012] The waste acid liquid storage tank is connected to the acid liquid preparation tank through a preparation tank feed pump, and the connection point is located at the top of the acid liquid preparation tank.

[0013] A filter net is arranged inside the preliminary filter.

[0014] The working principle of the utility model is:

[0015] The liquid phase in the pure water storage tank or the waste acid storage tank enters the acid preparation tank through the preparation tank feed pump, and the concentrated sulfuric acid in the concentrated sulfuric acid storage tank enters the acid preparation tank through the sulfuric acid feed pump, and the stirring paddle starts to work to prepare the acid; the prepared acid enters the activation kettle through the spray plate, and the humic acid enters the premixing tank through the solid phase feed port for premixing, and then enters the activation kettle through the inclined material guide pipe to activate the humic acid. After the activation is completed, the material enters the preliminary filter for solid-liquid separation; the separated liquid phase enters the premixing tank to premix the humic acid, and then the acid enters the waste acid temporary storage tank through the solid-liquid separation filter for storage, and then after filtering through the primary filter, enters the waste acid storage tank for storage and reuse. Among them, the premixing tank is used to premix the humic acid and the acid in the preliminary filter to improve the activation efficiency; the waste acid temporary storage tank is used to store the waste acid; the acid preparation tank is used to dilute the concentrated sulfuric acid.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] By adopting the sulfuric acid recycling system of the utility model, the acid liquid after use in the activation kettle is passed into the premixing tank through the setting of the preliminary filter and the premixing tank, and the humic acid is pre-acidified, which greatly improves the utilization efficiency of the sulfuric acid; the waste acid liquid after production is filtered and recovered through the setting of the waste acid liquid temporary storage tank, the waste acid liquid after treatment is mixed with concentrated sulfuric acid in the acid liquid preparation tank, and then enters the activation kettle again for production, which greatly improves the recycling rate of the sulfuric acid. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the sulfuric acid recycling system of the utility model;

[0019] In the figure: 1. concentrated sulfuric acid storage tank; 2. pure water storage tank; 3. waste acid liquid storage tank; 4. acid liquid preparation tank; 5. premixing tank; 6. activation kettle; 7. preliminary filter; 8. waste acid liquid temporary storage tank; 9. primary filter; 10. liquid level gauge; 11. spray plate; 12. preparation tank feed pump; 13. sulfuric acid feed pump; 14. stirring paddle; 15. solid phase feed port; 16. solid-liquid separation filter; 17. inclined material guide pipe; 18. filter screen. DETAILED DESCRIPTION

[0020] In order to make the purpose and technical solution of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings.

[0021] Example 1

[0022] like Figure 1As shown, the sulfuric acid recycling system includes a concentrated sulfuric acid storage tank 1, a pure water storage tank 2, a premixing tank 5, and an activation kettle 6. The concentrated sulfuric acid storage tank 1 is connected to the activation kettle 6 through an acid solution preparation tank 4, the premixing tank 5 is connected to the activation kettle 6 through an inclined material guide pipe 17, the activation kettle 6 is connected to the premixing tank 5 through a preliminary filter 7, the inclined material guide pipe 17 is connected to the waste acid solution storage tank 3 through a waste acid solution temporary storage tank 8, and the pure water storage tank 2 is connected to the acid solution preparation tank 4 through a preparation tank feed pump 12. The premixing tank 5 is used to premix humic acid and the acid solution in the preliminary filter 7 to improve the activation efficiency; the waste acid solution temporary storage tank 8 is used to store the waste acid solution; and the acid solution preparation tank 4 is used to dilute the concentrated sulfuric acid. A sulfuric acid feed pump 13 is provided between the concentrated sulfuric acid storage tank 1 and the acid solution preparation tank 4, a stirring paddle 14 is provided inside the acid solution preparation tank 4, and a liquid level meter 10 is provided on the outer side of the vertical wall of the acid solution preparation tank 4. The premixing tank 5 is provided with a solid phase feed port 15, the activation kettle 6 is provided with a spray plate 11 inside, and the acid liquid preparation tank 4 is connected to the spray plate 11 through a pipeline. The inclined material guide pipe 17 is connected to the waste acid liquid temporary storage tank 8 through a solid-liquid separation filter 16, and a primary filter 9 is provided between the waste acid liquid temporary storage tank 8 and the waste acid liquid storage tank 3. The waste acid liquid storage tank 3 is connected to the acid liquid preparation tank 4 through a preparation tank feed pump 12, and the connection is located at the top of the acid liquid preparation tank 4. A filter screen 18 is provided inside the preliminary filter 7.

[0023] The above sulfuric acid recycling system, when in operation, comprises the following steps:

[0024] (1) The liquid phase in the pure water storage tank 2 or the waste acid storage tank 3 enters the acid preparation tank 4 through the preparation tank feed pump 12, and the concentrated sulfuric acid in the concentrated sulfuric acid storage tank 1 enters the acid preparation tank 4 through the sulfuric acid feed pump 13, and the stirring paddle 14 starts to work to prepare the acid; (2) The prepared acid enters the activation kettle 6 through the spray plate 11, and the humic acid enters the premixing tank 5 through the solid phase feed port 15 for premixing, and then enters the activation kettle 6 through the inclined material guide pipe 17 to activate the humic acid. After the activation is completed, the material enters the preliminary filter 7 for solid-liquid separation; (3) The separated liquid phase enters the premixing tank 5, and the humic acid is premixed. Then, the acid enters the waste acid temporary storage tank 8 for storage through the solid-liquid separation filter 16, and then after being filtered by the primary filter 9, it enters the waste acid storage tank 3 for storage and reuse.

Claims

1. A sulfuric acid recycling system, characterized in that: The invention comprises a concentrated sulfuric acid storage tank (1), a pure water storage tank (2), a premixing tank (5), and an activation kettle (6). The concentrated sulfuric acid storage tank (1) is connected to the activation kettle (6) via an acid liquid preparation tank (4), the premixing tank (5) is connected to the activation kettle (6) via an inclined material guide pipe (17), the activation kettle (6) is connected to the premixing tank (5) via a preliminary filter (7), the inclined material guide pipe (17) is connected to the waste acid liquid storage tank (3) via a waste acid liquid temporary storage tank (8), and the pure water storage tank (2) is connected to the acid liquid preparation tank (4) via a preparation tank feed pump (12).

2. The sulfuric acid recycling system according to claim 1, characterized in that: A sulfuric acid feed pump (13) is provided between the concentrated sulfuric acid storage tank (1) and the acid solution preparation tank (4), a stirring paddle (14) is provided inside the acid solution preparation tank (4), and a liquid level meter (10) is provided on the outer side of the vertical wall of the acid solution preparation tank (4).

3. The sulfuric acid recycling system according to claim 1, characterized in that: The premixing tank (5) is provided with a solid phase feed port (15), the activation kettle (6) is provided with a spray plate (11) inside, and the acid solution preparation tank (4) is connected to the spray plate (11) through a pipeline.

4. The sulfuric acid recycling system according to claim 1, characterized in that: The inclined material guiding pipe (17) is connected to the waste acid liquid temporary storage tank (8) through a solid-liquid separation filter (16), and a primary filter (9) is provided between the waste acid liquid temporary storage tank (8) and the waste acid liquid storage tank (3).

5. The sulfuric acid recycling system according to claim 1, characterized in that: The waste acid liquid storage tank (3) is connected to the acid liquid preparation tank (4) via a preparation tank feed pump (12), and the connection point is located at the top of the acid liquid preparation tank (4).

6. The sulfuric acid recycling system according to claim 1, characterized in that: A filter screen (18) is provided inside the preliminary filter (7).

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