Low-level flash cooling treatment device for wet-process phosphoric acid production of high-foam slurry
Through the design of horizontal circulation pump and low-position flash cooling tower combined with the open-hole grating plate, the problem of unstable pump flow in low-grade phosphate ore wet phosphoric acid production is solved, the stability of slurry cooling and the continuous production are achieved, and the phosphoric acid production efficiency and product quality are improved.
Patent Information
- Application Number
- CN202422643442.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-10-31
AI Technical Summary
Traditional bubble and foam treatment methods lead to unstable flow of vertical circulation pumps in low-grade, high-impact phosphate wet phosphoric acid production, resulting in gas binding phenomenon, affecting the slurry cooling effect and phosphoric acid production efficiency.
The horizontal circulation pump and low-level flash cooling tower structure are adopted, combined with the open-hole grating plate to prevent large pieces of scalable materials from entering the pump, stabilize the slurry flow, avoid air binding, and ensure that the flash cooling temperature is within the normal range.
It effectively reduces the flow fluctuations during the slurry cooling process, ensures the stable operation of the low-level flash cooling system and the normal production of wet phosphoric acid, and improves production efficiency and product quality.
Smart Images
Figure CN223082323U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of wet-process purified phosphoric acid, and particularly relates to a low-position flash cooling treatment device for the production of wet-process phosphoric acid with high-foam slurry. Background Art
[0002] In the production of wet-process phosphoric acid, phosphoric acid is prepared by reacting phosphate rock with inorganic acid, followed by filtration and purification. In recent years, due to the reduction of high-grade phosphate rock resources, production enterprises have used low-grade and high-impurity phosphate rock to produce wet-process phosphoric acid. However, the low-grade and high-impurity phosphate rock has a high content of organic matter and carbonate. During the extraction reaction process, a large number of bubbles and foams are generated, and the foams slowly move towards the slurry liquid surface in the extraction reaction slurry, which not only occupies the volume of the extraction reaction tank but also reduces the production capacity.
[0003] The traditional method for treating bubbles and foams is to install a vertical flash cooling slurry circulation pump on the liquid surface of the extraction tank, and extract the slurry at the liquid surface position of the extraction slurry to the low-position flash cooling device for circulating cooling. However, during the extraction process, a large number of bubbles and foams accumulated on the liquid surface of the slurry cause the flow rate of the vertical circulation pump to be unstable, resulting in air binding (the phenomenon of air binding is that small-density bubbles and foams enter the pump and cannot be pushed to the outer edge of the impeller, blocking part or all of the impeller flow passage, reducing or interrupting the pump delivery flow rate). When air binding occurs, the flow rate of the vertical circulation pump decreases or even no liquid is discharged, causing a large fluctuation in the flow rate of the circulating slurry, resulting in poor and unstable slurry cooling effect; when the flash cooling temperature of the slurry exceeds the normal fluctuation of Δt2 °C to 6 °C, it affects the crystal form and shape of gypsum, causing difficult filtration and separation, resulting in reduced output, increased consumption, and affecting the normal production of wet-process phosphoric acid. Summary of the Invention
[0004] The purpose of the utility model is to solve the deficiencies of the existing technology and provide a low-position flash cooling treatment device for the production of wet-process phosphoric acid with foam slurry to overcome the above deficiencies of the low-position flash cooling treatment.
[0005] The technical solution adopted by the utility model is as follows:
[0006] A low-position flash cooling treatment device for the production of wet-process phosphoric acid with high-foam slurry, comprising an extraction tank, a horizontal circulation pump, and a low-position flash cooling tower arranged above the extraction tank;
[0007] The low-position flash cooling tower is a vertical cylindrical main body, with an air outlet at the upper end, a feed inlet in the middle, and a liquid outlet at the lower end;
[0008] The bottom of the extraction tank is provided with a discharge port. The inlet end of the horizontal circulation pump is connected to the discharge port through a first pipeline, and the outlet end is connected to the feed inlet of the low-position flash cooling tower through a second pipeline. A valve is arranged on the second pipeline, and the liquid outlet is connected to a third pipeline inserted into the extraction tank.
[0009] Furthermore, an opening grid plate is installed on the discharge port.
[0010] Further, the aperture of the perforated grille plate is 20 - 50 mm.
[0011] Further, the aperture of the perforated grille plate is 30 - 40 mm.
[0012] Further, the upper and lower parts of the low - level flash - cooling tower are small - arc conical ends, and the inner lining of the tower is heat - resistant and acid - resistant carbon bricks.
[0013] The beneficial effects of the present utility model:
[0014] By means of the low - level flash - cooling tower for horizontal flash - cooling pump feeding arranged at the bottom of the extraction tank in the present utility model, the high - bubble and foam slurry is cooled by low - level circulation, reducing the volatility of the circulating slurry volume during the slurry cooling process; the perforated grille plate installed at the bottom discharge port of the extraction tank effectively prevents the blockage caused by large - scale fouling materials entering the horizontal circulation pump; the horizontal circulation pump replaces the original vertical flash - cooling slurry circulation pump, avoiding the air - binding phenomenon caused by the transportation of high - foam slurry, keeping the flash - cooling temperature within the normal fluctuation range, and ensuring the operation of the low - level flash - cooling system and the normal production of wet - process phosphoric acid. Description of the Drawings
[0015] Figure 1 It is a structural schematic diagram of the present utility model. Detailed Embodiments
[0016] The content of the present utility model will be further elaborated below in conjunction with the specification drawings and embodiments.
[0017] As Figure 1 shown, a low - level flash - cooling treatment device for the production of wet - process phosphoric acid with high - foam slurry includes an extraction tank 1, a horizontal circulation pump 2, and a low - level flash - cooling tower 3 arranged above the extraction tank;
[0018] The low - level flash - cooling tower is a vertical cylindrical main body, with an air outlet 31 arranged at the upper end, a feed inlet 32 arranged in the middle, and a liquid outlet 33 arranged at the lower end.
[0019] A discharge port 11 is opened at the bottom of the extraction tank 1. The inlet end of the horizontal circulation pump is connected to the discharge port through a first pipeline 4, and the outlet end is connected to the feed inlet 31 of the low - level flash - cooling tower through a second pipeline 5. A large number of foams and bubbles generated in the reaction slurry in the extraction tank float towards the slurry surface, and the foams in the slurry discharged from the bottom discharge port of the extraction tank into the horizontal slurry circulation pump are greatly reduced, stabilizing the flow rate, making the process indexes of the low - level slurry flash - cooling system stable, keeping the flash - cooling temperature within the normal fluctuation range, and ensuring the operation of the low - level flash - cooling system and the normal production of wet - process phosphoric acid; a valve 6 is arranged on the second pipeline, and the liquid outlet is connected to a third pipeline 8 inserted into the extraction tank.
[0020] As a preferred solution, an opening grille plate 7 is installed at the discharge port. The aperture of the opening grille plate is 20 - 50 mm or 30 - 40 mm, which can effectively prevent large-scale fouling materials from entering the horizontal slurry circulation pump and prevent blockage of the horizontal slurry circulation pump and pipelines.
[0021] The structure of the extraction tank of the present utility model refers to the prior art.
[0022] The working principle and operation process of the present utility model are as follows:
[0023] The extraction slurry in the extraction tank is discharged from the discharge port at the bottom of the extraction tank, pumped into the low-level flash cooling tower by a horizontal circulation pump, circulated and cooled, and then shunted into the extraction tank by the third pipeline 8, avoiding the air binding phenomenon caused by the transportation of high-foam slurry, keeping the flash cooling temperature within the normal fluctuation range, and stably controlling the temperature within Δt2 °C to 2.3 °C, ensuring the operation of the low-level flash cooling system and the normal production of wet-process phosphoric acid.
[0024] The above-described embodiments are only descriptions of the preferred modes of the present utility model, and do not limit the scope of the present utility model. Without departing from the design spirit of the present utility model, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present utility model shall fall within the protection scope determined by the claims of the present utility model.
Claims
1. A low-level flash cooling treatment device for wet-process phosphoric acid production with high-foam slurry, characterized in that, It includes an extraction tank (1), a horizontal circulation pump (2), and a low-temperature flash cooling tower (3) arranged above the extraction tank; The low-temperature flash cooling tower is a vertical cylindrical body, with an air outlet (31) arranged at the upper end, a feed inlet (32) arranged in the middle, and a liquid outlet (33) arranged at the lower end; A discharge port (11) is opened at the bottom of the extraction tank (1). The inlet end of the horizontal circulation pump is communicated with the discharge port through a first pipeline (4), and the outlet end is communicated with the feed inlet (32) of the low-temperature flash cooling tower through a second pipeline (5). A valve (6) is arranged on the second pipeline. The liquid outlet is connected to a third pipeline (8) inserted into the extraction tank; The liquid outlet is connected to a third pipeline (8) inserted into the extraction tank.
2. The low-temperature flash cooling treatment device for wet-process phosphoric acid production using high-foam slurry, as described in claim 1, is characterized in that, An opening grille plate (7) is installed on the discharge port.
3. The low-level flash cooling treatment device for wet-process phosphoric acid production using high-foam slurry as claimed in claim 2, wherein, The aperture of the opening grille plate is 20 - 50 mm.
4. The low-temperature flash cooling treatment device for wet-process phosphoric acid production using high-foam slurry as claimed in claim 3, wherein, The aperture of the opening grille plate is 30 - 40 mm.
5. A low-level flash cooling treatment device for wet-process phosphoric acid production using high-foam slurry, characterized in that, The upper and lower parts of the low-temperature flash cooling tower are small-arc conical ends, and the inside of the tower is lined with heat-resistant and acid-resistant carbon bricks.