CN112007381A - Continuous extraction device and extraction method for phosphorus-containing waste acid - Google Patents
Continuous extraction device and extraction method for phosphorus-containing waste acid Download PDFInfo
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- CN112007381A CN112007381A CN202010935700.5A CN202010935700A CN112007381A CN 112007381 A CN112007381 A CN 112007381A CN 202010935700 A CN202010935700 A CN 202010935700A CN 112007381 A CN112007381 A CN 112007381A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D11/04—Solvent extraction of solutions which are liquid
- B01D11/0415—Solvent extraction of solutions which are liquid in combination with membranes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/26—Treatment of water, waste water, or sewage by extraction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D11/00—Solvent extraction
- B01D2011/002—Counter-current extraction
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
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Abstract
The invention discloses a phosphorus-containing waste acid continuous extraction device and an extraction method thereof.A hydrophobic and lipophilic film is used for separating an extraction separation tank to form an extraction cavity and a back extraction cavity, the top of the extraction cavity is provided with a first feeding nozzle connected with a waste acid feeding pipeline, and the bottom of the extraction cavity is provided with a raffinate discharging pipeline; the back extraction cavity top is provided with the second feeding shower nozzle of being connected with water charge pipeline, and the bottom is provided with diluted phosphoric acid ejection of compact pipeline, is provided with first solenoid valve on the spent acid charge pipeline, is provided with the second solenoid valve on the water charge pipeline, is provided with the third solenoid valve on the raffinate ejection of compact pipeline, is provided with the fourth solenoid valve on the diluted phosphoric acid ejection of compact pipeline, is provided with level sensor near tank bottoms department in the extraction separation jar. By setting the first liquid level and the discharge liquid level, water enters the extraction cavity while waste acid enters the back-extraction cavity, and extraction and back-extraction are continuously performed at the same time, so that the extraction and back-extraction efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of extraction equipment and extraction methods, and particularly relates to a continuous extraction device and an extraction method for phosphorus-containing waste acid.
Background
According to the latest national hazardous waste list, the phosphorus-containing waste acid in the aluminum surface treatment industry belongs to hazardous waste. In the production of aluminum surface treatment enterprises, a large amount of waste acid containing phosphorus is usually generated, the main components of the waste acid contain 10-40% of phosphoric acid, 5-20% of sulfuric acid, 1-5% of aluminum ions and a small amount of heavy metal ions, in the traditional process of treating the waste acid containing phosphorus, a neutralization precipitation method is the most common method, calcium hydroxide or other precipitants are generally adopted for neutralization precipitation, so that huge waste of phosphorus resources is caused, a large amount of dangerous waste sludge is generated, the production cost of the generated enterprises is greatly increased, and the repeated pollution to the environment is increased, so that the cost of the enterprises is increased, and the profit is reduced; reducing the business competitiveness of the enterprise.
In recent years, the comprehensive utilization of waste acid containing phosphorization polishing is continuously increased in domestic industries, for example, in patent CN201610064933.6, a high-temperature negative-pressure concentration method is mainly used for increasing the concentration of phosphoric acid, and the phosphoric acid is returned to a production line for use. Patent CN201310688185.5, which mainly utilizes calcium carbonate to desulfurize and uses lime milk to prepare calcium dihydrogen phosphate. And so on. The prior various comprehensive utilization technologies for waste acid containing phosphorization polishing have the defects of complex process or high energy consumption, low utilization efficiency and value of phosphoric acid, high impurity content of products, influence on service performance and the like.
The applicant researches that phosphoric acid is separated for secondary utilization by a method of extracting phosphoric acid from phosphorus-containing waste acid by using extract liquor and then carrying out back extraction and concentrating back-extracted dilute phosphoric acid, and an extraction device in the prior art is troublesome to use, low in extraction efficiency and difficult to realize continuous extraction.
Disclosure of Invention
The invention provides a continuous extraction device and an extraction method for phosphorus-containing waste acid, aiming at the defects of the prior art, the extraction separation system and the extraction method can realize continuous extraction, have high extraction efficiency, automatically and continuously perform extraction and back extraction, and automatically and respectively discharge raffinate and dilute phosphoric acid.
In order to solve the technical problem, the invention is solved by the following technical scheme: a continuous extraction device for phosphorus-containing waste acid comprises an extraction separation tank, wherein an extraction liquid feeding pipeline and an extraction liquid discharging pipeline are arranged on the extraction separation tank, an extraction cavity and a back-extraction cavity are formed in the extraction separation tank through separation of a hydrophobic lipophilic film, a first feeding spray head connected with the waste acid feeding pipeline is arranged at the top in the extraction cavity, and a raffinate discharging pipeline is arranged at the bottom in the extraction cavity; the back extraction chamber top is provided with the second feeding shower nozzle of being connected with water charge pipeline, and the bottom is provided with diluted phosphoric acid ejection of compact pipeline, be provided with first solenoid valve on the spent acid charge pipeline, be provided with the second solenoid valve on the water charge pipeline, be provided with the third solenoid valve on the raffinate ejection of compact pipeline, be provided with the fourth solenoid valve on the diluted phosphoric acid ejection of compact pipeline, be close tank bottoms department in the extraction separation jar and be provided with level sensor, level sensor is connected with controlling means, first solenoid valve the second solenoid valve the third solenoid valve with the fourth solenoid valve all connects controlling means. The continuous extraction device for the waste acid containing phosphorus can extract phosphoric acid from phosphoric acid in the extraction cavity, and the extractant can carry the phosphoric acid to pass through the hydrophobic lipophilic film and be back-extracted by water in the back-extraction cavity, so that continuous extraction and back-extraction can be realized, and the extraction and back-extraction efficiency is effectively improved.
In the above technical scheme, preferably, the waste acid feed pipe, the water feed pipe, the raffinate discharge pipe and the dilute phosphoric acid discharge pipe are all provided with flow regulating valves. The structure is adopted to conveniently control the flow of the waste acid feeding pipeline, the water feeding pipeline, the raffinate discharging pipeline and the dilute phosphoric acid discharging pipeline. And water or phosphorus-containing waste acid is kept between the extraction liquid and the raffinate discharge pipeline and the dilute phosphoric acid discharge pipeline all the time in the operation process of the device, and the extraction liquid cannot flow out.
In the above technical scheme, preferably, two circles of positioning columns distributed annularly are arranged in the extraction separation tank, and the hydrophobic oleophilic film is wound on the positioning columns in a winding manner to separate the extraction separation tank into the extraction cavity and the back-extraction cavity. The structure is used for increasing the area of the hydrophobic oleophilic film, so that the flow of the extraction liquid between the extraction cavity and the back extraction cavity is accelerated.
An extraction method of a continuous extraction device for phosphorus-containing waste acid comprises the following steps: 1. injecting an extraction liquid with the density smaller than that of the waste acid solution into an extraction separation tank to form an extraction liquid column, recording a first liquid level of a liquid level sensor by a control device at the moment, and setting a discharge liquid level by the control device, wherein the speed of the phosphorus-containing waste acid reaching the lower part of the extraction liquid column is faster than the speed of the extraction liquid reaching the discharge liquid level; 2. the control device controls the first electromagnetic valve and the second electromagnetic valve to open phosphorus-containing waste acid and water, the phosphorus-containing waste acid is dispersed into waste acid liquid drops through the first feeding spray head and drops onto the extraction liquid, slowly penetrates through the extraction liquid and sinks below the extraction liquid column to form raffinate, the water is dispersed into water drops through the second feeding spray head and drops onto the extraction liquid, and slowly penetrates through the extraction liquid and sinks below the extraction liquid column to form dilute phosphoric acid; 3. after the extraction liquid gradually rises to the discharge liquid level, the control device controls the third electromagnetic valve and the fourth electromagnetic valve to open, the raffinate discharge and the phosphorus-containing waste acid feed are at the same speed, and the dilute phosphoric acid discharge and the water feed are at the same speed.
In the above technical solution, preferably, the extraction liquid is a mixture of tributyl phosphate and solvent oil. The mixture of the tributyl phosphate and the solvent oil is selected as the extraction liquid, because the density of the mixture is very close to that of the phosphorus-containing waste acid and the water, the phosphorus-containing waste acid and the water can penetrate through the extraction liquid at a sufficiently slow speed, the phosphoric acid in the phosphorus-containing waste acid can be fully extracted, or the phosphoric acid in the extraction liquid can be fully back-extracted by the water, and the tributyl phosphate and the solvent oil can smoothly penetrate through the hydrophobic lipophilic film, so that phosphate ions dissolved in the mixed liquid of the tributyl phosphate and the solvent oil can enter the back-extraction cavity from the extraction cavity, and the continuous extraction and the back-extraction can be smoothly realized.
In the above technical solution, preferably, the extract is tributyl phosphate.
Compared with the prior art, the invention has the following beneficial effects: the continuous extraction device for the waste acid containing phosphorus can extract phosphoric acid from phosphoric acid in the extraction cavity, and the extractant can carry the phosphoric acid to pass through the hydrophobic lipophilic film and be back-extracted by water in the back-extraction cavity, so that continuous extraction and back-extraction can be realized, and the extraction and back-extraction efficiency is effectively improved.
Drawings
FIG. 1 is a schematic structural diagram of an extraction liquid at a first liquid level according to an embodiment of the present invention.
FIG. 2 is a schematic structural diagram of an extraction liquid at a discharge liquid level according to an embodiment of the present invention.
FIG. 3 is a bottom half-sectional view of an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the following detailed description and accompanying drawings: referring to fig. 1 to 3, a continuous extraction device for phosphorus-containing waste acid comprises an extraction separation tank 1, wherein an extraction liquid feeding pipeline 2 and an extraction liquid discharging pipeline 3 are arranged on the extraction separation tank 1, an extraction cavity 5 and a back-extraction cavity 6 are formed in the extraction separation tank 1 by separating a hydrophobic lipophilic film 4, a first feeding nozzle 8 connected with a waste acid feeding pipeline 7 is arranged at the top in the extraction cavity 5, and a raffinate discharging pipeline 9 is arranged at the bottom; the top of back extraction chamber 6 is provided with second feed nozzle 11 of being connected with water charge pipeline 10, the bottom is provided with diluted phosphoric acid discharge pipeline 12, be provided with first solenoid valve 13 on spent acid charge pipeline 7, be provided with second solenoid valve 14 on the water charge pipeline 10, be provided with third solenoid valve 15 on the raffinate discharge pipeline 9, be provided with fourth solenoid valve 16 on the diluted phosphoric acid discharge pipeline 12, the department is provided with level sensor 17 near the tank bottom in the extraction separation tank 1, level sensor 17 is connected with controlling means 18, first solenoid valve 13, second solenoid valve 14, third solenoid valve 15 and the equal connection control device 18 of fourth solenoid valve 16. The continuous extraction device for the waste acid containing phosphorus can extract phosphoric acid from phosphoric acid in the extraction cavity 5, and the extractant can carry the phosphoric acid to pass through the hydrophobic oleophilic film 4 and be back-extracted by water in the back-extraction cavity 6, so that continuous extraction and back-extraction can be realized, and the extraction and back-extraction efficiency can be effectively improved.
Furthermore, in order to conveniently control the flow, it is ensured that water or phosphorus-containing waste acid is always reserved between the extraction liquid and the raffinate discharge pipeline 9 and the dilute phosphoric acid discharge pipeline 12 in the operation process of the device, the extraction liquid cannot flow out, and the waste acid feed pipeline 7, the water feed pipeline 10, the raffinate discharge pipeline 9 and the dilute phosphoric acid discharge pipeline 12 are all provided with a flow regulating valve 19.
Furthermore, in order to increase the area of the hydrophobic oleophilic oil film 4 and accelerate the flow of the extraction liquid between the extraction cavity 5 and the back-extraction cavity 6, two circles of positioning columns 20 distributed annularly are arranged in the extraction separation tank 1, and the hydrophobic oleophilic oil film 4 is wound on the positioning columns in a winding manner to separate the extraction separation tank 1 into the extraction cavity 5 and the back-extraction cavity 6.
The continuous extraction device for the phosphorus-containing waste acid comprises the following steps: 1. Injecting an extraction liquid with the density smaller than that of the waste acid solution into an extraction separation tank to form an extraction liquid column, recording a first liquid level of a liquid level sensor by a control device at the moment, and setting a discharge liquid level by the control device, wherein the speed of the phosphorus-containing waste acid reaching the lower part of the extraction liquid column is faster than the speed of the extraction liquid reaching the discharge liquid level; 2. the control device controls the first electromagnetic valve and the second electromagnetic valve to open phosphorus-containing waste acid and water, the phosphorus-containing waste acid is dispersed into waste acid liquid drops through the first feeding spray head and drops onto the extraction liquid, slowly penetrates through the extraction liquid and sinks below the extraction liquid column to form raffinate, the water is dispersed into water drops through the second feeding spray head and drops onto the extraction liquid, and slowly penetrates through the extraction liquid and sinks below the extraction liquid column to form dilute phosphoric acid; 3. after the extraction liquid gradually rises to the discharge liquid level, the control device controls the third electromagnetic valve and the fourth electromagnetic valve to open, the raffinate discharge and the phosphorus-containing waste acid feed are at the same speed, and the dilute phosphoric acid discharge and the water feed are at the same speed. The extract is a mixture of tributyl phosphate and solvent oil.
Example 1, a mixture of 40% of TBP and 60% of No. 26 solvent oil in percentage by mass is taken out of an extraction liquid and injected into an extraction separation tank to form an extraction liquid column of 1m, a control device records a first liquid level of a liquid level sensor at the moment, a discharge liquid level is set to be 2m by the control device, and the speed of phosphorus-containing waste acid reaching the lower part of the extraction liquid column is higher than the speed of the extraction liquid reaching the discharge liquid level; 2. the control device controls the first electromagnetic valve and the second electromagnetic valve to open phosphorus-containing waste acid and water, the phosphorus-containing waste acid is dispersed into waste acid liquid drops through the first feeding spray head and drops onto the extraction liquid, slowly penetrates through the extraction liquid and sinks below the extraction liquid column to form raffinate, the water is dispersed into water drops through the second feeding spray head and drops onto the extraction liquid, and slowly penetrates through the extraction liquid and sinks below the extraction liquid column to form dilute phosphoric acid; 3. after the extraction liquid gradually rises to the discharge liquid level, the control device controls the third electromagnetic valve and the fourth electromagnetic valve to open, the raffinate discharge and the phosphorus-containing waste acid feed are at the same speed, and the dilute phosphoric acid discharge and the water feed are at the same speed. The extract is a mixture of tributyl phosphate and solvent oil.
The recovery rate of phosphoric acid was measured to be 33.9%, and the components of the raffinate and dilute phosphoric acid solution obtained by separation were measured and are shown in the following table:
raffinate:
| item | Aluminum g/L | Sulfate radical g/L | Phosphate radical g/L | Iron g/L | Nickel ppm | Ppm of lead | Chromium ppm | Cadmium ppm | Copper ppm | Zinc ppm | Mercury ppm | Barium ppm | Arsenic ppm |
| Index (I) | 28.6 | 121.5 | 167.8 | 1.9 | 108.6 | 2.0 | 92.7 | <0.1 | 19.1 | 27.4 | <0.01 | 0.31 | 0.2 |
Diluted phosphoric acid:
| item | Aluminum g/L | Sulfate radical g/L | Phosphate radical g/L | Iron ppm | Nickel ppm | Ppm of lead | Chromium ppm | Cadmium ppm | Copper ppm | Zinc ppm | Mercury ppm | Barium ppm | Arsenic ppm |
| Index (I) | 0.14 | 1.8 | 86.1 | 187 | 19.8 | 0.21 | 12.7 | <0.1 | 5.3 | 5.2 | <0.01 | <0.1 | <0.1 |
Example 2, which differs from example 1 only in that the extract was a mixture of 50% by mass of TBP and 50% by mass of # 26 mineral spirits, and the phosphoric acid recovery was determined to be 58.8%, the separated raffinate and dilute phosphoric acid solution components were tested and are listed below:
raffinate:
| item | Aluminum g/L | Sulfate radical g/L | Phosphate radical g/L | Iron g/L | Nickel ppm | Ppm of lead | Chromium ppm | Cadmium ppm | Copper ppm | Zinc ppm | Mercury ppm | Barium ppm | Arsenic ppm |
| Index (I) | 28.8 | 122.4 | 104.6 | 2.1 | 124.2 | 2.2 | 102.7 | <0.1 | 22.3 | 30.6 | <0.01 | 0.31 | 0.2 |
Diluted phosphoric acid:
| item | Aluminum g/L | Sulfate radical g/L | Phosphate radical g/L | Iron ppm | Nickel ppm | Ppm of lead | Chromium ppm | Cadmium ppm | Copper ppm | Zinc ppm | Mercury ppm | Barium ppm | Arsenic ppm |
| Index (I) | 0.089 | 2.5 | 150.8 | 1.4 | 2.1 | 0.22 | 1.9 | <0.1 | 1.02 | 1.15 | <0.01 | <0.1 | <0.1 |
Example 3, which differs from example 1 only in that the extract was a mixture of 70% TBP and 30% mineral spirits # 26, and a 84.7% phosphoric acid recovery was determined, the separated raffinate and dilute phosphoric acid solution components were tested and are listed below:
raffinate:
| item | Aluminum g/L | Sulfate radical g/L | Phosphate radical g/L | Iron g/L | Nickel ppm | Ppm of lead | Chromium ppm | Cadmium ppm | Copper ppm | Zinc ppm | Mercury ppm | Barium ppm | Arsenic ppm |
| Index (I) | 29.9 | 120.1 | 40.5 | 2.3 | 132 | 2.4 | 107.2 | <0.1 | 26.2 | 34.1 | <0.01 | 0.33 | 0.28 |
Diluted phosphoric acid:
| item | Aluminum g/L | Sulfate radical g/L | Phosphate radical g/L | Iron ppm | Nickel ppm | Ppm of lead | Chromium ppm | Cadmium ppm | Copper ppm | Zinc ppm | Mercury ppm | Barium ppm | Arsenic ppm |
| Index (I) | 0.018 | 3.97 | 204.9 | 2.6 | 0.37 | <0.1 | 0.71 | <0.1 | 0.12 | 0.18 | <0.01 | <0.1 | <0.1 |
Example 4, which differs from example 1 only in that the extract was a mixture of 90% TPB and 10% mineral spirits # 26, and the phosphoric acid recovery was 95.6%, the separated raffinate and dilute phosphoric acid solution components were tested and are listed below:
raffinate:
| item | Aluminum g/L | Sulfate radical g/L | Phosphate radical g/L | Iron g/L | Nickel ppm | Ppm of lead | Chromium ppm | Cadmium ppm | Copper ppm | Zinc ppm | Mercury ppm | Barium ppm | Arsenic ppm |
| Index (I) | 30.1 | 119.6 | 12.0 | 2.2 | 135 | 2.5 | 107.6 | <0.1 | 26.9 | 35.2 | <0.01 | 0.32 | 0.31 |
Dilute phosphoric acid
| Item | Aluminum g/L | Sulfate radical g/L | Phosphate radical g/L | Iron ppm | Nickel ppm | Ppm of lead | Chromium ppm | Cadmium ppm | Copper ppm | Zinc ppm | Mercury ppm | Barium ppm | Arsenic ppm |
| Index (I) | 0.022 | 4.54 | 225.9 | 1.2 | 0.55 | <0.1 | 0.73 | <0.1 | 0.21 | 0.37 | <0.01 | <0.1 | <0.1 |
Example 5 differs from example 1 only in that the extract was 100% TPB and the phosphoric acid recovery was 96.1%, and the separated raffinate and dilute phosphoric acid solution components were tested and are listed below:
raffinate:
| item | Aluminum g/L | Sulfate radical g/L | Phosphate radical g/L | Iron g/L | Nickel ppm | Ppm of lead | Chromium ppm | Cadmium ppm | Copper ppm | Zinc ppm | Mercury ppm | Barium ppm | Arsenic ppm |
| Index (I) | 29.9 | 118.7 | 11.9 | 2.1 | 136 | 2.4 | 110.1 | <0.1 | 27.1 | 26.4 | <0.01 | 0.34 | 0.36 |
Dilute phosphoric acid
| Item | Aluminum g/L | Sulfate radical g/L | Phosphate radical g/L | Iron ppm | Nickel ppm | Ppm of lead | Chromium ppm | Cadmium ppm | Copper ppm | Zinc ppm | Mercury ppm | Barium ppm | Arsenic ppm |
| Index (I) | 0.017 | 4.69 | 226.2 | 1.2 | 0.53 | <0.1 | 0.34 | <0.1 | 0.11 | 0.33 | <0.01 | <0.1 | <0.1 |
From the data obtained in examples 1 to 5, it can be seen that the closer the densities of the extract solution and the phosphoric waste acid and water are, the higher the recovery rate of the phosphoric acid is, and the closer the densities of the extract solution and the phosphoric waste acid and water are, the longer the waste acid and water pass through the extract solution, and the more sufficient the extraction and the back extraction are.
Therefore, the extraction separation system and the extraction method not only can realize continuous extraction, have high extraction efficiency, automatically and continuously carry out extraction and back extraction, automatically and respectively discharge raffinate and dilute phosphoric acid, but also have high phosphoric acid recovery rate.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.
Claims (6)
1. The utility model provides a phosphorus-containing waste acid continuous extraction device, includes extraction knockout drum (1), be provided with extract feed line (2) and extract ejection of compact pipeline (3) on extraction knockout drum (1), its characterized in that: an extraction cavity (5) and a back extraction cavity (6) are formed in the extraction separation tank (1) through a hydrophobic lipophilic film (4) in a separating mode, a first feeding spray nozzle (8) connected with a waste acid feeding pipeline (7) is arranged at the top in the extraction cavity (5), and a raffinate discharging pipeline (9) is arranged at the bottom; back extraction chamber (6) top is provided with second feeding shower nozzle (11) of being connected with water charge pipeline (10), and the bottom is provided with diluted phosphoric acid discharge pipeline (12), be provided with first solenoid valve (13) on spent acid charge pipeline (7), be provided with second solenoid valve (14) on water charge pipeline (10), be provided with third solenoid valve (15) on raffinate discharge pipeline (9), be provided with fourth solenoid valve (16) on diluted phosphoric acid discharge pipeline (12), nearly tank bottom department is provided with level sensor (17) in extraction knockout drum (1), level sensor (17) are connected with controlling means (18), first solenoid valve (13) second solenoid valve (14) third solenoid valve (15) with fourth solenoid valve (16) all are connected controlling means (18).
2. The continuous extraction device of phosphorus-containing waste acid as claimed in claim 1, wherein: and flow regulating valves (19) are arranged on the waste acid feeding pipeline (7), the water feeding pipeline (10), the raffinate discharging pipeline (9) and the dilute phosphoric acid discharging pipeline (12).
3. The continuous extraction device of phosphorus-containing waste acid as claimed in claim 1, wherein: be provided with a plurality of reference columns (20) of two rings of annular distributions in extraction knockout drum (1), what hydrophobic lipophilic film (4) meandered winds establishes on the reference column will extraction knockout drum (1) separate and form extraction chamber (5) with back extraction chamber (6).
4. The extraction method of the continuous extraction device for phosphorus-containing waste acid as claimed in any one of claims 1 to 3, wherein: the method comprises the following steps: 1. injecting an extraction liquid with the density smaller than that of the waste acid solution into an extraction separation tank to form an extraction liquid column, recording a first liquid level of a liquid level sensor by a control device at the moment, and setting a discharge liquid level by the control device, wherein the speed of the phosphorus-containing waste acid reaching the lower part of the extraction liquid column is faster than the speed of the extraction liquid reaching the discharge liquid level; 2. the control device controls the first electromagnetic valve and the second electromagnetic valve to open phosphorus-containing waste acid and water, the phosphorus-containing waste acid is dispersed into waste acid liquid drops through the first feeding spray head and drops onto the extraction liquid, slowly penetrates through the extraction liquid and sinks below the extraction liquid column to form raffinate, the water is dispersed into water drops through the second feeding spray head and drops onto the extraction liquid, and slowly penetrates through the extraction liquid and sinks below the extraction liquid column to form dilute phosphoric acid; 3. after the extraction liquid gradually rises to the discharge liquid level, the control device controls the third electromagnetic valve and the fourth electromagnetic valve to open, the raffinate discharge and the phosphorus-containing waste acid feed are at the same speed, and the dilute phosphoric acid discharge and the water feed are at the same speed.
5. The extraction method of the continuous extraction device for waste acid containing phosphorus according to claim 4, wherein the extraction method comprises the following steps: the extraction liquid is a mixture of tributyl phosphate and solvent oil.
6. The extraction method of the continuous extraction device for waste acid containing phosphorus according to claim 4, wherein the extraction method comprises the following steps: the extract is tributyl phosphate.
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