Device for adjusting phosphoric acid concentration

Abstract

This utility model provides a device for adjusting the concentration of phosphoric acid. The technical solution includes a raw material tank and a mixing tank. The outlet of the raw material tank is connected to one of the inlets of the mixing tank via a raw material outlet main pipe and a raw material to mixing pipe, with a first magnetic pump installed on the raw material outlet main pipe. The other inlet at the top of the mixing tank is connected to a pure water pipe via a flange. The outlet of the mixing tank is connected to one of the inlets of a buffer tank via a mixing outlet main pipe and a mixing to buffer pipe, with a second magnetic pump installed on the mixing outlet main pipe. The outlet of the buffer tank is connected to another inlet at the top of the mixing tank via a buffer outlet main pipe and a buffer to mixing pipe, with a third magnetic pump installed on the buffer outlet main pipe. The beneficial effects of this utility model are: (1) Optimizing the mixing process and shortening the mixing time; (2) Reducing waste acid generation and lowering environmental risks; (3) Enhancing the uniformity of material mixing and ensuring product stability.

Description

Technical Field

[0001] This utility model belongs to the field of phosphoric acid production technology, and in particular relates to a device for adjusting the concentration of phosphoric acid. Background Technology

[0002] Phosphoric acid is an inorganic moderately strong acid, often present in industrial production as an aqueous solution of 85% wt or higher. It is widely used at room temperature in agricultural fertilizers, chemical raw materials, and the food industry. The display panel and semiconductor industries have high requirements for the purity and concentration control of phosphoric acid raw materials, necessitating the formulation and supply of phosphoric acid in various specifications.

[0003] Currently, phosphoric acid concentration control typically involves feeding high-concentration raw materials (around 89% wt) into a mixing tank for dilution with water to achieve the target concentration. Concentration testing requires manual sampling, and the amount of water added is calculated manually, which can easily lead to excessive water addition and a lower concentration. Often, if the phosphoric acid concentration is too low, the phosphoric acid in the mixing tank needs to be drained before feeding in high-concentration phosphoric acid for mixing. This results in prolonged mixing time and the generation of low-concentration waste acid, necessitating further optimization of the process. Summary of the Invention

[0004] To address the problems in the prior art, this utility model provides a device for adjusting the concentration of phosphoric acid. The technical solution includes a raw material tank and a mixing tank. The outlet of the raw material tank is connected to one of the inlets of the mixing tank via a raw material outlet main pipe and a raw material to mixing pipe, both connected by flanges. A first magnetic pump is installed on the raw material outlet main pipe. The other inlet at the top of the mixing tank is connected to a pure water pipe via a flange. The outlet of the mixing tank is connected to one of the inlets of a buffer tank via a mixing outlet main pipe and a mixing to buffer pipe, both connected by flanges. A second magnetic pump is installed on the mixing outlet main pipe. The outlet of the buffer tank is connected to another inlet at the top of the mixing tank via a buffer outlet main pipe and a buffer to mixing pipe, both connected by flanges. A third magnetic pump is installed on the buffer outlet main pipe.

[0005] In a preferred embodiment, the outlet of the raw material tank is connected to another inlet at the top of the buffer tank via a raw material outlet main pipe and a raw material to buffer pipe, respectively, through flanges.

[0006] In a preferred embodiment, the outlet of the raw material tank is connected to the circulation inlet of the raw material tank via a raw material outlet main pipe and a raw material circulation pipe, respectively, through flanges.

[0007] In a preferred embodiment, the outlet of the mixing tank is connected to the circulation inlet of the mixing tank via a mixing outlet main pipe and a mixing circulation pipe, respectively, through flanges.

[0008] In a preferred embodiment, the outlet of the buffer tank is connected to the circulation inlet of the buffer tank via a buffer outlet main pipe and a buffer circulation pipe, which are then connected in sequence by flanges.

[0009] In a preferred embodiment, the outlet of the raw material tank is also connected to a raw material sampling pipeline via a raw material outlet main pipe.

[0010] In a preferred embodiment, the outlet of the mixing tank is also connected to a mixing sampling pipeline via a mixing outlet main pipe.

[0011] In a preferred embodiment, the outlet of the buffer tank is also connected to a buffer sampling pipeline via a buffer outlet manifold.

[0012] The beneficial effects of this utility model are:

[0013] (1) When the phosphoric acid concentration in the mixing tank is low, there is no need to discharge the material as in the traditional process. The phosphoric acid in the mixing tank can be directly pumped into the buffer tank and then the acid can be replenished through the raw material tank for mixing again. This eliminates the tedious steps of discharging and refeeding, greatly shortens the mixing cycle, and improves production efficiency.

[0014] (2) In traditional processes, phosphoric acid with low concentration needs to be discharged as waste acid, which not only wastes raw materials but also increases the cost of environmental treatment. This device uses a buffer tank reflux design to allow low-concentration phosphoric acid to be re-integrated into the blending process, avoiding the generation of low-concentration waste acid, reducing raw material waste and environmental risks, and conforming to the concept of green production.

[0015] (3) The raw material tank, mixing tank and buffer tank are all equipped with circulation pipes. The material is driven to circulate in the tank by a magnetic pump to ensure uniform material concentration in the tank and avoid local concentration deviation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] In the diagram: 1. Raw material tank; 101. Raw material outlet main pipe; 102. Raw material circulation pipeline; 103. Raw material to buffer pipeline; 104. Raw material to blending pipeline; 105. Raw material sampling pipeline; 2. Blending tank; 201. Blending outlet main pipe; 202. Blending circulation pipeline; 203. Blending to buffer pipeline; 204. Blending sampling pipeline; 205. Pure water pipeline; 3. Buffer tank; 301. Buffer outlet main pipe; 302. Buffer circulation pipeline; 303. Buffer to blending pipeline; 304. Buffer sampling pipeline; 4. First magnetic pump; 5. Second magnetic pump; 6. Third magnetic pump. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] Example

[0020] like Figure 1The apparatus shown for adjusting the concentration of phosphoric acid includes a raw material tank 1 and a mixing tank 2. The outlet of the raw material tank 1 is connected to one of the inlets of the mixing tank 2 via a raw material outlet manifold 101 and a raw material to mixing pipe 104 through flanges. A first magnetic pump 4 is installed on the raw material outlet manifold 101. The other inlet at the top of the mixing tank 2 is connected to a pure water pipe 205 via a flange. The outlet of the mixing tank 2 is connected to one of the inlets of a buffer tank 3 via a mixing outlet manifold 201 and a mixing to buffer pipe 203 through flanges. A second magnetic pump 5 is installed on the mixing outlet manifold 201. The outlet of the buffer tank 3 is connected to the other inlet at the top of the mixing tank 2 via a buffer outlet manifold 301 and a buffer to mixing pipe 303 through flanges. A third magnetic pump 6 is installed on the buffer outlet manifold 301.

[0021] Furthermore, the outlet of the raw material tank 1 is connected to another inlet at the top of the buffer tank 3 via a raw material outlet main pipe 101 and a raw material to buffer pipe 103 through flanges.

[0022] Furthermore, the outlet of the raw material tank 1 is connected to the circulation inlet of the raw material tank 1 via flanges through the raw material outlet main pipe 101 and the raw material circulation pipe 102.

[0023] Furthermore, the outlet of the mixing tank 2 is connected to the circulation inlet of the mixing tank 2 via flanges through the mixing outlet main pipe 201 and the mixing circulation pipe 202.

[0024] Furthermore, the outlet of the buffer tank 3 is connected to the circulation inlet of the buffer tank 3 via a buffer outlet main pipe 301 and a buffer circulation pipe 302 in sequence through flanges.

[0025] Furthermore, the outlet of the raw material tank 1 is also connected to the raw material sampling pipe 105 via the raw material outlet main pipe 101.

[0026] Furthermore, the outlet of the mixing tank 2 is also connected to the mixing sampling pipeline 204 via the mixing outlet main pipe 201.

[0027] Furthermore, the outlet of the buffer tank 3 is also connected to the buffer sampling pipe 304 through the buffer outlet manifold 301.

[0028] Raw material tank 1, mixing tank 2, and buffer tank 3 are all equipped with level gauges and pH sensors to monitor the liquid level and pH value inside the tanks. The pH value is used to calculate the corresponding phosphoric acid concentration.

[0029] A flow meter is installed on the pure water pipeline 205 to monitor the flow rate of the pure water being added.

[0030] The raw material circulation pipeline 102, the raw material to buffer pipeline 103, the raw material to blending pipeline 104, the blending circulation pipeline 202, the blending to buffer pipeline 203, the buffer circulation pipeline 302, and the buffer to blending pipeline 303 are all equipped with corresponding pneumatic valves, and the pneumatic valves are all remotely controlled by a remote control system; the raw material sampling pipeline 105, the blending sampling pipeline 204, and the buffer sampling pipeline 304 are all equipped with corresponding manual valves.

[0031] Using the above-mentioned device, the process is as follows: raw phosphoric acid in raw material tank 1 is pumped into mixing tank 2 by magnetic pump 4. Pure water is added to mixing tank 2 through pure water pipe 205 to dilute the phosphoric acid. After dilution, the pH sensor on mixing tank 2 is observed. If the mixed concentration is higher than the required concentration, pure water is added to mixing tank 2 after calculating the required amount. If the mixed concentration is lower than the required concentration and the liquid level is too high to continue adding raw phosphoric acid, the phosphoric acid in mixing tank 2 is pumped into buffer tank 3 by magnetic pump 5. Then, raw phosphoric acid is added to mixing tank 2 through raw material tank 1. If the concentration is qualified after sampling, the low-concentration phosphoric acid in buffer tank 3 does not need to be used. If the concentration is higher than the required concentration, pure water does not need to be added. The low-concentration phosphoric acid in buffer tank 3 is pumped into mixing tank 2 by magnetic pump 6 for mixing until the concentration is qualified (the corresponding circulation pipeline is used for circulation during mixing to ensure that the material is mixed evenly).

[0032] The buffer tank 3 can also be used as an extension of the mixing tank 2. In this case, both the magnetic pump 5 and the magnetic pump 6 are started. The mixture is connected to the buffer tank 2, the mixing outlet main pipe 201, the mixing to the buffer pipe 203, the buffer tank 3, the buffer outlet main pipe 301, and the buffer to the mixing pipe 303 to form a large circulation pipeline for mixing the materials.

Claims

1. An apparatus for adjusting the concentration of phosphoric acid, comprising a raw material tank (1) and a mixing tank (2), characterized in that, The outlet of the raw material tank (1) is connected to one of the inlets of the mixing tank (2) via a raw material outlet main pipe (101) and a raw material to mixing pipe (104) through flanges. A first magnetic pump (4) is provided on the raw material outlet main pipe (101). The other inlet at the top of the mixing tank (2) is connected to the pure water pipe (205) via a flange. The outlet of the mixing tank (2) is connected to one of the inlets of the buffer tank (3) via a mixing outlet main pipe (201) and a mixing to buffer pipe (203) through flanges. A second magnetic pump (5) is provided on the mixing outlet main pipe (201). The outlet of the buffer tank (3) is connected to the other inlet at the top of the mixing tank (2) via a buffer outlet main pipe (301) and a buffer to mixing pipe (303) through flanges. A third magnetic pump (6) is provided on the buffer outlet main pipe (301).

2. The apparatus for adjusting phosphoric acid concentration according to claim 1, characterized in that, The outlet of the raw material tank (1) is connected to the other inlet at the top of the buffer tank (3) in sequence via the raw material outlet main pipe (101) and the raw material to buffer pipe (103).

3. The apparatus for adjusting phosphoric acid concentration according to claim 1, characterized in that, The outlet of the raw material tank (1) is connected to the circulation inlet of the raw material tank (1) in sequence via the raw material outlet main pipe (101) and the raw material circulation pipe (102) through flanges.

4. The apparatus for adjusting phosphoric acid concentration according to claim 1, characterized in that, The outlet of the mixing tank (2) is connected to the circulation inlet of the mixing tank (2) in sequence via the mixing outlet main pipe (201) and the mixing circulation pipe (202) through flanges.

5. The apparatus for adjusting phosphoric acid concentration according to claim 1, characterized in that, The outlet of the buffer tank (3) is connected to the circulation inlet of the buffer tank (3) in sequence via the buffer outlet main pipe (301) and the buffer circulation pipe (302) through flanges.

6. The apparatus for adjusting phosphoric acid concentration according to claim 1, characterized in that, The outlet of the raw material tank (1) is also connected to the raw material sampling pipe (105) through the raw material outlet manifold (101).

7. The apparatus for adjusting phosphoric acid concentration according to claim 1, characterized in that, The outlet of the mixing tank (2) is also connected to the mixing sampling pipeline (204) through the mixing outlet manifold (201).

8. The apparatus for adjusting phosphoric acid concentration according to claim 1, characterized in that, The outlet of the buffer tank (3) is also connected to the buffer sampling pipe (304) through the buffer outlet manifold (301).

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