Vacuum defoaming device and defoaming method for wet phosphoric acid extraction

Abstract

The present invention belongs to the technical field of wet phosphoric acid extraction, and specifically discloses a vacuum defoaming device for wet phosphoric acid extraction, wherein the air suction port of the defoaming barrel is connected to the air inlet of the high-pressure fan, and the air outlet of the high-pressure fan is connected to the air ventilation duct at the top of the wet phosphoric acid extraction device; the feed port of the defoaming barrel is connected to the extraction tank through an adjustable porous bubble suction head assembly; the discharge port of the defoaming barrel is connected to the extraction tank, and a solenoid valve is installed at the discharge port. The present invention also discloses a defoaming method, which is: by generating negative pressure inside the defoaming barrel, the foam and gas on the surface of the slurry are sucked into the defoaming barrel, and the mechanical shear force generated by the negative pressure in the defoaming barrel is used to reduce the foam to slurry, and the foam is discharged back to the extraction tank through the discharge port. The present invention adopts physical methods to eliminate foam, greatly reduces the cost of repeatedly purchasing consumable chemical additives and production operations, and improves the purity of phosphoric acid extraction and the quality of the product. The present invention is suitable for wet extraction of phosphoric acid.

Description

Technical Field

[0001] The invention belongs to the technical field of wet phosphoric acid extraction, and relates to a defoaming device and a defoaming method, in particular to a wet phosphoric acid extraction vacuum defoaming device and a defoaming method. Background Art

[0002] At present, the wet phosphoric acid extract used in the wet phosphoric acid extraction process has high viscosity and high temperature, which is very easy to produce a large amount of foam. In addition, existing phosphorus chemical enterprises generally have problems such as complex mineral sources and large differences in mineral content, which leads to large changes in the state of the foam, making it more difficult to select the dosage and model of the defoamer, reducing the effect and adaptability of the defoamer. In addition, the addition of defoamers in the wet phosphoric acid extraction process not only reduces the purity of the phosphoric acid extraction and the quality of the product, but also affects the continuity of the entire production process. A large amount of harmful gases containing fluorosilicic acid will be generated during the wet phosphoric acid extraction process, and the addition of defoamers will accelerate the release of harmful gases. In addition, defoamers are consumable products that need to be purchased repeatedly, increasing production and operation costs. If the defoaming is not timely and ideal, it will cause the weather tank of the device to be blocked, overflowing the tank and other phenomena, which will bring huge hidden dangers to production safety. Summary of the invention

[0003] The purpose of the present invention is to provide a vacuum defoaming device and a defoaming method for wet phosphoric acid extraction, which can eliminate bubbles without adding a defoaming agent, thereby improving the safety of the phosphoric acid extraction process and the purity of the phosphoric acid extraction.

[0004] In order to achieve the above-mentioned purpose, the technical methods adopted by the present invention are as follows:

[0005] A vacuum defoaming device for wet phosphoric acid extraction comprises a defoaming barrel, wherein the top of the defoaming barrel cover is provided with an air suction port, the upper part of the defoaming barrel is provided with a feed port, the bottom of the defoaming barrel is provided with a discharge port, and a solenoid valve is installed at the discharge port; the air suction port of the defoaming barrel is connected with the air inlet of a high-pressure blower through a vacuum suction pipe, and the air outlet of the high-pressure blower is connected with the air ventilation duct at the top of the wet phosphoric acid extraction device through an exhaust pipe; the feed port at the top of the defoaming barrel is connected with the bubble outlet of an adjustable porous bubble suction head assembly through a vacuum suction pipe, and the adjustable The bubble suction port of the porous bubble suction head assembly contacts the foam on the surface of the slurry in the extraction tank; the discharge port of the defoaming barrel is connected to the extraction tank through a pipeline; a resistance shear plate is installed on the inner side wall of the defoaming barrel, and an anti-corrosion wire mesh grille is provided inside the defoaming barrel, which is installed at the position where the defoaming barrel cover and the defoaming barrel are connected; a frequency converter, an automatic control unit and a manual switch are arranged inside the medium frequency electric control cabinet, the manual switch controls the switch of the high-pressure fan, the solenoid valve is connected to the automatic control unit, and the automatic control unit is connected to the high-pressure fan through the frequency converter.

[0006] As a limitation: a suction pipe is provided at the feed inlet of the defoaming barrel, and the suction pipe forms a 10° angle downward with the inner wall of the defoaming barrel.

[0007] As a further limitation: the lower part of the defoaming barrel is a conical structure, and the bottom of the conical structure is a discharge port; the lower part of the interior of the defoaming barrel is provided with a conical downflow port.

[0008] As a further limitation: the wet phosphoric acid extraction vacuum defoaming device also includes a bracket, a base and a motor compartment, the bracket is connected to the base, and the cone structure above the bracket supports the defoaming barrel; the high-pressure fan is arranged inside the motor compartment, and the motor compartment is installed on the base.

[0009] The present invention also provides a defoaming method for the above-mentioned wet phosphoric acid extraction vacuum defoaming device, which comprises: turning on the switch of the high-pressure fan, the air intake port of the high-pressure fan is connected with the air exhaust port of the defoaming barrel, a negative pressure is generated inside the defoaming barrel, and the feed port of the defoaming barrel sucks the foam and gas on the surface of the slurry in the extraction tank into the defoaming barrel through the adjustable porous bubble suction head assembly, and the foam generates a downward rotating force with the help of the negative pressure to hit the resistance shear plate and the anti-corrosion wire mesh grid in the defoaming barrel, thereby forming a mechanical shear force, destroying the foam structure, releasing the gas in the foam, and reducing the foam to slurry. The gas enters the phosphoric acid extraction device through the suction port, the high-pressure fan air inlet, and the high-pressure fan outlet in turn, and the slurry flows into the bottom of the defoaming barrel. When the slurry level rises to the rising height preset by the automatic control unit, the automatic control unit controls the solenoid valve at the discharge port to open, and at the same time, controls the high-pressure fan to close, and the slurry is discharged back to the extraction tank through the discharge port. When the slurry level drops to the falling height preset by the automatic control unit, the automatic control unit controls the solenoid valve at the discharge port to close, and at the same time, controls the high-pressure fan to open, starting a new round of defoaming process.

[0010] Due to the adoption of the above scheme, the present invention has the following beneficial effects compared with the prior art:

[0011] The wet phosphoric acid extraction vacuum defoaming device provided by the present invention generates negative pressure in a defoaming barrel so that an adjustable porous bubble suction head component absorbs foam on the surface of the slurry, and then destroys the structure of the foam in the defoaming barrel by shear force to restore it to slurry, and eliminates the foam by a physical method without adding any consumable chemical additives such as defoaming agents. The device is put into long-term use once, and maintenance and management are simpler, which greatly reduces the cost of repeated purchase of consumable chemical additives and production operations; consumable chemical additives such as defoaming agents are not added, and the purity of phosphoric acid extraction and the quality of the product are also improved; in addition, the device effectively recovers fluorosilicic acid gas through a high-pressure fan, which is convenient for the extraction and reuse of fluorosilicic acid, improves environmental quality, and increases economic benefits.

[0012] The invention is applicable to wet extraction of phosphoric acid. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0014] Figure 1 A top view of a defoaming barrel in an embodiment of the present invention;

[0015] Figure 2 This is a schematic diagram of the installation position of the resistance shear plate in the defoaming barrel in an embodiment of the present invention;

[0016] Figure 3 This is a schematic structural diagram of a vacuum defoaming device for wet phosphoric acid extraction according to an embodiment of the present invention;

[0017] In the figure: 1. Suction port; 2. Feed port; 3. Resistance shear plate; 4. Conical downflow port; 5. Defoaming barrel; 6. Solenoid valve; 7. Discharge port; 8. High-pressure fan; 9. Air inlet; 10. Air outlet; 11. Medium-frequency electric control cabinet; 12. Base; 13. Adjustable porous bubble suction head assembly; 14. Bracket. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with embodiments, but those skilled in the art should understand that the present invention is not limited to the following embodiments, and any improvements and equivalent changes made based on the specific embodiments of the present invention are within the scope of protection of the claims of the present invention.

[0019] Embodiment Wet phosphoric acid extraction vacuum defoaming device and defoaming method

[0020] A wet phosphoric acid extraction vacuum defoaming device, the structural schematic diagram of which is as follows Figure 3 As shown, it includes a defoaming barrel 5, a bracket 14, a base 12 and a motor compartment. The top view of the defoaming barrel is as shown in Figure 1 As shown, an air exhaust port 1 is provided at the top of the cover of the defoaming barrel 5, a feed port 2 is provided at the upper part of the defoaming barrel 5, a suction pipe is provided at the feed port 2 of the defoaming barrel, and the suction pipe forms a 10° angle downward with the inner wall of the defoaming barrel 5, the lower part of the defoaming barrel 5 is a conical structure, the bottom of the conical structure is a discharge port 7, a solenoid valve 6 is installed at the discharge port 7, and a conical downflow port 4 is provided at the lower part of the interior of the defoaming barrel 5; the bracket 14 is connected to the base 12, and the upper part of the bracket 14 supports the conical structure of the defoaming barrel 5; the high-pressure fan 8 is arranged inside the motor compartment, and the motor compartment is installed on the base 12. The air suction port 1 of the defoaming barrel 5 is connected to the air inlet 9 of the high-pressure fan 8 through a vacuum suction pipe, and the air outlet 10 of the high-pressure fan 8 is connected to the air ventilation duct at the top of the wet phosphoric acid extraction device through an exhaust pipe; the feed port 2 at the top of the defoaming barrel 5 is connected to the bubble outlet of the adjustable porous bubble suction head assembly 13 through a vacuum suction pipe, and the bubble suction port of the adjustable porous bubble suction head assembly 13 contacts the foam on the surface of the slurry in the extraction tank; the discharge port 7 of the defoaming barrel 5 is connected to the extraction tank through a pipeline; a resistance shear plate 3 is installed on the inner side wall of the defoaming barrel 5, and the installation position diagram of the resistance shear plate 3 inside the defoaming barrel 5 is shown in FIG. Figure 2As shown, an anti-corrosion wire mesh grille is provided inside the defoaming barrel 5 and is installed at the position where the cover of the defoaming barrel 5 and the defoaming barrel 5 are connected; a frequency converter, an automatic control unit and a manual switch are provided inside the medium frequency electric control cabinet 11, the manual switch controls the switch of the high-pressure fan 8, the solenoid valve 6 is connected to the automatic control unit, and the automatic control unit is connected to the high-pressure fan 8 through the frequency converter.

[0021] A defoaming method for the above-mentioned wet phosphoric acid extraction vacuum defoaming device, the method is: turn on the switch of the high-pressure fan 8, the air intake port of the high-pressure fan 8 is connected with the exhaust port 1 of the defoaming barrel 5, negative pressure is generated inside the defoaming barrel 5, the feed port 2 of the defoaming barrel 5 sucks the foam and gas on the surface of the slurry in the extraction tank into the defoaming barrel 5 through the adjustable porous bubble suction head component 13, the foam generates a downward rotation force with the help of the negative pressure to hit the resistance shear plate 3 and the anti-corrosion wire mesh grid in the defoaming barrel 5, forming a mechanical shear force, destroying the foam structure, releasing the gas in the foam, and reducing the foam to slurry, and the gas passes through the exhaust port 1 in sequence. , the air inlet 9 of the high-pressure fan 8, and the air outlet 10 of the high-pressure fan 8 enter the phosphoric acid extraction device, and the slurry flows into the bottom of the defoaming barrel 5 along the conical downflow port 4 of the defoaming barrel 5. When the slurry level rises to the rising height preset by the automatic control unit, the automatic control unit controls the solenoid valve 6 at the discharge port 7 to open, and at the same time, controls the high-pressure fan 8 to close, and the slurry is discharged back to the extraction tank through the discharge port 7. When the slurry level drops to the dropping height preset by the automatic control unit, the automatic control unit controls the solenoid valve 6 at the discharge port 7 to close, and at the same time, controls the high-pressure fan 8 to open, and starts a new round of defoaming process.

Claims

1. A vacuum defoaming device for wet phosphoric acid extraction, characterized in that: The invention comprises a defoaming barrel, wherein the top of the defoaming barrel cover is provided with an air suction port, the upper part of the defoaming barrel is provided with a feeding port, a suction pipe is provided at the feeding port of the defoaming barrel, and the suction pipe forms a 10° angle downward with the inner wall of the defoaming barrel; a conical downflow port is provided at the lower part of the interior of the defoaming barrel, the lower part of the defoaming barrel is a conical structure, a discharge port is provided at the bottom of the conical structure, and a solenoid valve is installed at the discharge port; the air suction port of the defoaming barrel is connected with the air inlet of the high-pressure blower through a vacuum suction pipe, and the air outlet of the high-pressure blower is connected with the air ventilation duct at the top of the wet phosphoric acid extraction device through an exhaust pipe; the feeding port at the upper part of the defoaming barrel is connected with the bubble outlet of an adjustable porous bubble suction head assembly through a vacuum suction pipe, and the bubble suction port of the adjustable porous bubble suction head assembly is connected with the bubble on the surface of the slurry in the extraction tank foam contact; the discharge port of the defoaming barrel is connected with the extraction tank through a pipeline; a plurality of resistance shear plates are installed circumferentially on the inner side wall of the defoaming barrel, the resistance shear plates are right-angled triangular plates, and the size gradually increases along the circumferential direction, one acute-angle end of the resistance shear plate faces downward, and the other acute-angle end faces the central axis of the defoaming barrel, and the downward acute-angle ends of the resistance shear plates are located at the same height in the defoaming barrel and above the conical downflow port; an anti-corrosion wire mesh grille is provided inside the defoaming barrel and is installed at the position where the defoaming barrel cover and the defoaming barrel are connected; a frequency converter, an automatic control unit and a manual switch are arranged inside the medium-frequency electric control cabinet, the manual switch controls the switch of the high-pressure fan, the solenoid valve is connected to the automatic control unit, and the automatic control unit is connected to the high-pressure fan through the frequency converter.

2. The wet phosphoric acid extraction vacuum defoaming device according to claim 1, characterized in that: The wet phosphoric acid extraction vacuum defoaming device also includes a bracket, a base and a motor compartment. The bracket is connected to the base, and the cone structure of the defoaming barrel is supported above the bracket; the high-pressure fan is arranged inside the motor compartment, and the motor compartment is installed on the base.

3. A defoaming method for the vacuum defoaming device for wet phosphoric acid extraction according to claim 1 or 2, characterized in that: The method comprises the following steps: turning on the switch of the high-pressure fan, the air inlet of the high-pressure fan is connected with the air exhaust port of the defoaming barrel, a negative pressure is generated inside the defoaming barrel, the feed port of the defoaming barrel sucks the foam and gas on the surface of the slurry in the extraction tank into the defoaming barrel through the adjustable porous foam suction head assembly, the foam generates a downward rotation force with the help of the negative pressure to hit the resistance shear plate and the anti-corrosion wire mesh grid in the defoaming barrel, forming a mechanical shear force, destroying the foam structure, releasing the gas in the foam, and reducing the foam to slurry, the gas enters the phosphoric acid extraction device through the air exhaust port, the air inlet of the high-pressure fan, and the air outlet of the high-pressure fan in sequence, the slurry flows into the bottom of the defoaming barrel, when the slurry level rises to the rising height preset by the automatic control unit, the automatic control unit controls the solenoid valve at the discharge port to open, and at the same time, controls the high-pressure fan to close, the slurry is discharged back to the extraction tank through the discharge port, when the slurry level drops to the falling height preset by the automatic control unit, the automatic control unit controls the solenoid valve at the discharge port to close, and at the same time, controls the high-pressure fan to open, and starts a new round of defoaming process.

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