Device and method for preparing copper sulfate from waste etching liquid

Abstract

The invention discloses a device for preparing copper sulfate from waste etching liquid. The device comprises a box body, wherein a separation chamber, a reaction chamber and a concentration chamber are sequentially arranged inside the box body from bottom to top, the separation chamber and the reaction chamber being connected via a connecting pipe. A buffer tank and a plurality of filter tanks are fixed on the top of the box body and are connected via a connecting pipe to the top of the concentration chamber. The concentration chamber is provided with a heating pipe. A stirring assembly is provided on one side of the reaction chamber. An extraction assembly is provided on the top of the separation chamber. A concentrated sulfuric acid tank is provided on one side of the box body and is connected via a connecting pipe to the top of one side of the reaction chamber. A fan is provided on the other side of the box body and is connected to the top of one side of the separation chamber. An air outlet pipe is also provided and is connected to the tops of the concentration chamber and the separation chamber, respectively. The air outlet pipe is connected to a purifier. Several of the connecting pipes are provided with flow meters and solenoid valves.

Description

Technical Field

[0001] The invention relates to the field of preparing copper sulfate from waste etching liquid, and in particular to a device and a method for preparing copper sulfate from waste etching liquid. Background Art

[0002] In the electronics industry, the manufacture of printed circuit boards not only consumes large amounts of water and energy, but also produces chemicals that are harmful to the environment and human health. During the circuit board manufacturing process, a mixed solution of copper chloride and hydrochloric acid is used to etch copper plates to form conductive circuits. As the etching proceeds, the concentration of copper ions in the solution continues to increase, which requires discharge to form acidic etching waste liquid. The main components of acidic etching waste liquid are copper chloride, hydrogen chloride, sodium chloride, etc., which seriously pollute the environment, affect the survival of microorganisms in water, destroy soil aggregate structure, and affect the survival of crops. Researchers have been committed to the development and promotion of economical and efficient acid etching waste liquid recycling technology.

[0003] The existing device for preparing copper sulfate from etching waste liquid has simple functions, low degree of automation in preparing copper sulfate, and requires excessive manual operations, resulting in low completion of the preparation method by the preparation device. Summary of the Invention

[0004] In order to overcome the deficiencies of the above-mentioned prior art, the present invention provides an apparatus and method for preparing copper sulfate from waste etching liquid, so as to solve the problem that the existing apparatus for preparing copper sulfate from waste etching liquid proposed in the background art has simple functions, low degree of automation in preparing copper sulfate, and requires excessive manual operations, resulting in low completion of the preparation method by the preparation apparatus.

[0005] To solve the above technical problems, the present invention provides the following technical solution: a device for preparing copper sulfate from waste etching liquid, comprising a box body, wherein a separation chamber, a reaction chamber and a concentration chamber are sequentially arranged inside the box body from bottom to top, the separation chamber and the reaction chamber being connected through a connecting pipe. A buffer tank and several filter tanks are fixed on the top of the box body and are connected to the top of the concentration chamber through a connecting pipe. The concentration chamber is provided with a heating pipe, a stirring assembly is provided on one side of the reaction chamber, and an extraction assembly is provided on the top of the separation chamber. A concentrated sulfuric acid tank is provided on one side of the box body and is connected to the top of one side of the reaction chamber through a connecting pipe. A fan is provided on the other side of the box body and is connected to the top of one side of the separation chamber. An air outlet pipe is also provided and is connected to the top of the concentration chamber and the separation chamber respectively. The air outlet pipe is connected to a purifier. Several of the connecting pipes are provided with a flow meter and a solenoid valve.

[0006] Preferably, two filter tanks are provided and fixed on both sides of the top of the box body. The buffer tank is located between the two filter tanks and is filled with a buffer, which can be ammonia water.

[0007] Preferably, a temperature sensor and a pH sensor extending into the interior are embedded in the top of the concentration chamber, the heating tube is fixed around the periphery of the concentration chamber, and the connecting tube connecting the concentration chamber and the reaction chamber has one end connected to the bottom of one side of the concentration chamber and the other end connected to the top side of the reaction chamber.

[0008] Preferably, the extraction component includes: a stirring shaft, a stirring blade, a driven helical gear, a motor, a rotating shaft and a driving helical gear. The vertical bearing of the stirring shaft is connected to the top of the reaction chamber. The stirring blades are provided in a number and fixed to the periphery of the stirring shaft. The driven helical gear is sleeved and fixed on the top of the stirring shaft. The motor is fixed on the side of the reaction chamber away from the concentrated sulfuric acid tank. One end of the rotating shaft is connected to the motor and passes through one side of the stirring shaft. The driving helical gear is coaxially fixed to the end of the rotating shaft and meshes with the driven helical gear.

[0009] Preferably, the extraction component includes: a lifting frame, a filter plate, a cylinder and a connecting rod. The lifting frame is arranged at the bottom of the separation bin and is consistent with the size of the bottom of the separation bin. The filter plate is embedded in the top of the lifting frame. The cylinder is inverted at the top center of the separation bin, and the output shaft passes through the interior of the separation bin. The connecting rod is bow-shaped, with both ends respectively connected to the two sides of the top of the lifting frame, and the center of the side is fixed to the output shaft of the cylinder.

[0010] Preferably, a heating pipe is also provided in the fan, and a folding pipe is connected to the air outlet end, and the other end of the folding pipe is plugged into the top of one side of the separation bin. The purifier is fixed on one side of the box and is located above the fan. The air outlet pipe is a three-way pipe, one end of which is connected to the air inlet end of the purifier, and the other two ends are respectively connected to the top of the concentration bin and the separation bin.

[0011] Preferably, a drain pipe is connected to the bottom of the separation chamber away from the folding tube. The drain pipe is also provided with a filter element and a solenoid valve. The other end of the drain pipe passes through the outside of the box body. The outside of the box body is also embedded with three observation ports corresponding to the separation chamber, reaction chamber and concentration chamber respectively. The separation chamber, reaction chamber and concentration chamber are all made of acid-resistant transparent materials.

[0012] The method for preparing copper sulfate from waste etching solution comprises the following steps:

[0013] S1. Collect and process the etching waste liquid: collect the etching waste liquid into a filter tank, filter it through multiple filter elements, and then enter the concentration tank through a connecting pipe after filtration;

[0014] S2. Neutralize the pH value of the etching waste liquid and concentrate the copper ions contained therein: Detect the pH value of the etching waste liquid in the concentration chamber by a pH sensor, and adjust the pH value of the etching waste liquid by adding a buffer agent in a quantitative manner in a buffer tank connected to the concentration chamber and equipped with a flow meter and a solenoid valve. Then, heat the area around the concentration chamber by a heating pipe to increase the temperature of the etching waste liquid inside, evaporate the water in the etching waste liquid, concentrate the copper ions, and finally enter the reaction chamber through a connecting pipe;

[0015] S3, reacting the copper ions in the etching waste liquid with concentrated sulfuric acid: through a concentrated sulfuric acid tank connected to the reaction chamber and equipped with a flow meter and a solenoid valve, adding concentrated sulfuric acid into the reaction chamber in a quantitative manner, reacting with the copper ions to form copper sulfate, stirring the reaction by a stirring component to ensure uniform reaction, and finally entering the separation chamber through a connecting pipe;

[0016] S4. Precipitation and collection of copper sulfate solids: The etching waste liquid containing copper sulfate enters the separation chamber for static precipitation. The copper sulfate solids will be precipitated on the filter plate at the bottom of the separation chamber. After a certain period of time, the filter plate is driven upward by the cylinder of the extraction component, and the drain pipe with the filter screen is opened to discharge the waste liquid from the drain pipe. The copper sulfate solids are placed on the filter plate.

[0017] S5. Drying and collecting the copper sulfate solid: Using a heated blower to deliver hot air into the separation chamber to dry the copper sulfate solid, and finally taking out the filter plate to collect the copper sulfate.

[0018] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the preparation device of the present invention is provided with a separation chamber, a reaction chamber and a concentration chamber in sequence from bottom to top in the box body, and a filter tank and a buffer tank connected to the concentration chamber are provided on the top of the box body, a concentrated sulfuric acid tank connected to the reaction chamber is provided on one side of the box body, a stirring component is also provided on one side of the reaction chamber, and an extraction component is provided on the top of the separation chamber. When in use, the etching waste liquid only needs to be poured from the filter tank, and the device can automatically complete the preparation. First, it reaches the concentration chamber after being filtered through the filter tank, and the buffer tank is used to discharge the buffer to adjust the pH value and then heat it to concentrate the copper ions in the waste liquid. Finally, it is discharged into the reaction chamber and discharged into the concentrated sulfuric acid tank for reaction, and the stirring component is used to evenly stir the reaction, and then discharged into the separation chamber for precipitation, and the solid copper sulfate is separated, automatically extracted by the extraction component, and a fan is provided for drying. Finally, the box door is opened for collection. The degree of automation is high and no excessive manual operation is required. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an overall schematic diagram of the device of the present invention;

[0020] Figure 2 For the present invention Figure 1 A magnified view of point A;

[0021] Figure 3 This is a schematic diagram of the external structure of the device of the present invention;

[0022] Figure 4 Flow chart of the method of the present invention;

[0023] Among them: 1. Box body; 2. Concentration chamber; 3. Reaction chamber; 4. Separation chamber; 5. Filter tank; 6. Filter element; 7. Buffer tank; 8. Flow meter; 9. Heating tube; 10. Temperature sensor; 11. pH sensor; 12. Concentrated sulfuric acid tank; 13. Stirring assembly; 14. Driven bevel gear; 15. Stirring shaft; 16. Stirring blade; 17. Rotating shaft; 18. Motor; 19. Driving bevel gear; 20. Cylinder; 21. Connecting rod; 22. Lifting frame; 23. Filter plate; 24. Fan; 25. Folding tube; 26. Purifier; 27. Air outlet pipe; 28. Drain pipe; 29. ​​Observation port. DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features, purpose and efficacy of the present invention easy to understand, the present invention is further described below in conjunction with specific examples, but the following examples are only preferred embodiments of the present invention, not all. Based on the examples in the embodiments, other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention. The experimental methods in the following examples, unless otherwise specified, are conventional methods, and the materials, reagents, etc. used in the following examples, unless otherwise specified, can be obtained from commercial channels. Example

[0025] like Figure 1-4 As shown, the present invention provides a device for preparing copper sulfate from waste etching liquid, comprising a housing 1, wherein a separation chamber 4, a reaction chamber 3 and a concentration chamber 2 connected by a connecting pipe are sequentially provided inside the housing 1 from bottom to top, a buffer tank 7 and several filter tanks 5 are fixed on the top of the housing 1, which are connected to the top of the concentration chamber 2 through a connecting pipe, the concentration chamber 2 is provided with a heating pipe 9, a stirring assembly 13 is provided on one side of the reaction chamber 3, and an extraction assembly is provided on the top of the separation chamber 4. A concentrated sulfuric acid tank 12 is provided on one side of the housing 1, which is connected to the top of one side of the reaction chamber 3 through a connecting pipe, and a fan 24 is provided on the other side of the housing 1, which is connected to the top of one side of the separation chamber 4, and an air outlet pipe 27 is provided, which is connected to the top of the concentration chamber 2 and the separation chamber 4 respectively. The air outlet pipe 27 is connected to a purifier 26, and several of the connecting pipes are provided with a flow meter 8 and a solenoid valve. In actual application, the housing 1 needs to have a door, and the separation chamber 4 needs to have an opening larger than the filter plate 23 to facilitate the collection of solid copper sulfate on the surface of the filter plate 23.

[0026] In this embodiment, specifically, two filter tanks 5 are provided and fixed on both sides of the top of the box body 1. The buffer tank 7 is located between the two filter tanks 5 and is filled with a buffer, which may be ammonia water.

[0027] In this embodiment, specifically, a temperature sensor 10 and a pH sensor 11 extending into the interior are embedded in the top of the concentration chamber 2, and the heating tube 9 is fixed around the periphery of the concentration chamber 2. The connecting tube connecting the concentration chamber 2 and the reaction chamber 3 has one end connected to the bottom of one side of the concentration chamber 2 and the other end connected to the top side of the reaction chamber 3.

[0028] In this embodiment, specifically, the extraction component includes: a stirring shaft 15, a stirring blade 16, a driven helical gear 14, a motor 18, a rotating shaft 17 and a driving helical gear 19, the stirring shaft 15 is vertically bearing-connected to the top of the reaction bin 3, the stirring blade 16 is provided with a plurality of and fixed to the periphery of the stirring shaft 15, the driven helical gear 14 is sleeved and fixed on the top of the stirring shaft 15, the motor 18 is fixed on the side of the reaction bin 3 away from the concentrated sulfuric acid tank 12, one end of the rotating shaft 17 is transmission-connected to the motor 18, and passes through one side of the stirring shaft 15, the driving helical gear 19 is coaxially fixed to the end of the rotating shaft 17, and meshes with the driven helical gear 14;

[0029] The motor 18 drives the rotating shaft 17 to rotate, which drives the driving bevel gear 19 to rotate, thereby driving the meshing driven bevel gear 14 to rotate, and finally drives the stirring shaft 15 and the stirring blade 16 to rotate, so that the concentrated sulfuric acid and the waste liquid with copper ions in the reaction chamber 3 can be fully stirred and reacted.

[0030] In this embodiment, specifically, the extraction assembly includes: a lifting frame 22, a filter plate 23, a cylinder 20 and a connecting rod 21. The lifting frame 22 is provided at the bottom of the separation bin 4 and is consistent with the size of the bottom of the separation bin 4. The filter plate 23 is embedded in the top of the lifting frame 22. The cylinder 20 is inverted at the top center of the separation bin 4, and the output shaft passes through the interior of the separation bin 4. The connecting rod 21 is arched, with both ends respectively connected to the two sides of the top of the lifting frame 22, and the center of the side is fixed to the output shaft of the cylinder 20.

[0031] The cylinder 20 drives the connecting rod 21 to rise, and the connecting rod 21 drives the lifting frame 22 to rise, thereby driving the filter plate 23 to rise. Since solid copper sulfate is precipitated on the surface of the filter plate 23 when it is stationary, the filter plate 23 will filter out the wastewater and collect the solid copper sulfate when it rises.

[0032] In this embodiment, specifically, the fan 24 is also provided with a heating tube 9, and the air outlet end is connected to a folded tube 25, the other end of the folded tube 25 is plugged into the top of one side of the separation chamber 4, the purifier 26 is fixed to one side of the box body 1 and is located above the fan 24, and the air outlet pipe 27 is a three-way pipe, one end of which is connected to the air inlet end of the purifier 26, and the other two ends are connected to the top of the concentration chamber 2 and the separation chamber 4 respectively;

[0033] The purifier 26 is an existing acid waste gas purifier, which has a built-in fan to extract waste gas and discharge it after purification.

[0034] In this embodiment, specifically, a drain pipe 28 is connected to the bottom of the separation chamber 4 away from the folding tube 25. The drain pipe 28 is also provided with a filter element 6 and a solenoid valve. The other end of the drain pipe 28 passes through the outside of the box body 1. The outside of the box body 1 is also embedded with three observation ports 29 corresponding to the separation chamber 4, the reaction chamber 3 and the concentration chamber 2 respectively. The separation chamber 4, the reaction chamber 3 and the concentration chamber 2 are all made of acid-resistant transparent materials.

[0035] The method for preparing copper sulfate from waste etching solution comprises the following steps:

[0036] S1. Collect and process the etching waste liquid: collect the etching waste liquid into the filter tank 5, filter it through the multiple filter elements 6, and then enter the concentration tank 2 through the connecting pipe;

[0037] S2. Neutralizing the pH value of the etching waste liquid and concentrating the copper ions contained therein: The pH value of the etching waste liquid in the concentration chamber 2 is detected by a pH sensor 11. A buffer tank 7 connected to the concentration chamber 2 and equipped with a flow meter 8 and a solenoid valve is used to quantitatively add a buffer to adjust the pH value of the etching waste liquid. The area around the concentration chamber 2 is then heated by a heating tube 9 to increase the temperature of the etching waste liquid inside, evaporate the water in the etching waste liquid, concentrate the copper ions, and finally enter the reaction chamber 3 through a connecting pipe.

[0038] S3, reacting the copper ions in the etching waste liquid with concentrated sulfuric acid: through the concentrated sulfuric acid tank 12 connected to the reaction chamber 3 and equipped with a flow meter 8 and a solenoid valve, quantitatively adding concentrated sulfuric acid into the reaction chamber 3, reacting with the copper ions to form copper sulfate, stirring the reaction by the stirring component 13 to ensure uniform reaction, and finally entering the separation chamber 4 through the connecting pipe;

[0039] S4. Precipitation and collection of copper sulfate solids: The etching waste liquid containing copper sulfate enters the separation chamber 4 for static precipitation. The copper sulfate solids will be precipitated on the filter plate 23 at the bottom of the separation chamber 4. After a certain time, the cylinder 20 of the extraction component drives the filter plate 23 upward, and the drain pipe 28 with a filter screen is opened to discharge the waste liquid from the drain pipe 28. The copper sulfate solids are placed on the filter plate 23.

[0040] S5, drying and collecting the copper sulfate solid: conveying hot air into the separation bin 4 through the blower 24 with heating to dry the copper sulfate solid, and finally taking out the filter plate 23 to collect the copper sulfate.

[0041] Working principle: The preparation method of the present invention is realized by a preparation device. First, the etching waste liquid is put into the filter tank 5. After the impurities are filtered out by the filter element 6, the electromagnetic valve of the connecting pipe is opened to enter the concentration chamber 2. Then, the pH sensor 11 is detected, and the flow meter 8 provided in the buffer tank 7 and its connecting pipe is matched, and a suitable buffer is added to adjust the pH value of the etching waste liquid in the concentration chamber 2. Then, the heating pipe 9 is opened to heat the etching waste liquid in the concentration chamber 2. The temperature is monitored by the temperature sensor 10. The heating can concentrate the copper ions in the waste liquid, and then the waste liquid is fed into the concentration chamber 2 through the connecting pipe. Enter the reaction warehouse 3, while adding concentrated sulfuric acid and copper ions in a quantitative manner through the concentrated sulfuric acid tank 12 and the flowmeter 8 to react, and stirring is performed by the stirring component 13 to uniformly react to generate copper sulfate. After the reaction, it enters the separation warehouse 4 through the connecting pipe for static precipitation. After precipitation, solid copper sulfate remains on the surface of the filter plate 23. The solenoid valve of the drain pipe 28 is opened and the filter plate 23 is lifted by the extraction component at the same time to discharge the wastewater to obtain solid copper sulfate. The solid copper sulfate is then dried by the fan 24 with the heating tube 9, and finally the box 1 is opened to collect it.

[0042] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for preparing copper sulfate from waste etching liquid, comprising a housing (1), characterized in that: The box (1) is provided with a separation chamber (4), a reaction chamber (3) and a concentration chamber (2) connected through a connecting pipe in sequence from bottom to top. A buffer tank (7) and a plurality of filter tanks (5) are fixed on the top of the box (1) and are connected to the top of the concentration chamber (2) through the connecting pipe. The concentration chamber (2) is provided with a heating pipe (9). A stirring assembly (13) is provided on one side of the reaction chamber (3). An extraction assembly is provided on the top of the separation chamber (4). A concentrated sulfuric acid tank (12) is provided on one side of the box (1) and is connected to the top of one side of the reaction chamber (3) through the connecting pipe. A fan (24) is provided on the other side of the box (1) and is connected to the top of one side of the separation chamber (4). An air outlet pipe (27) is also provided and is connected to the top of the concentration chamber (2) and the separation chamber (4). The air outlet pipe (27) is connected to a purifier (26). Several of the connecting pipes are provided with flow meters (8) and solenoid valves. The top of the concentration chamber (2) is embedded with a temperature sensor (10) and a pH sensor (11) extending into the interior. The heating tube (9) is fixed around the periphery of the concentration chamber (2). The connecting tube connecting the concentration chamber (2) and the reaction chamber (3) has one end connected to the bottom of one side of the concentration chamber (2) and the other end connected to the top side of the reaction chamber (3). The extraction component comprises: a stirring shaft (15), a stirring blade (16), a driven helical gear (14), a motor (18), a rotating shaft (17) and a driving helical gear (19); the stirring shaft (15) is vertically bearing-connected to the top of the reaction chamber (3); a plurality of stirring blades (16) are provided and fixed to the periphery of the stirring shaft (15); the driven helical gear (14) is sleeved and fixed to the top of the stirring shaft (15); the motor (18) is fixed to the side of the reaction chamber (3) away from the concentrated sulfuric acid tank (12); one end of the rotating shaft (17) is transmission-connected to the motor (18) and extends to one side of the stirring shaft (15); the driving helical gear (19) is coaxially fixed to the end of the rotating shaft (17) and meshes with the driven helical gear (14); The extraction assembly comprises: a lifting frame (22), a filter plate (23), a cylinder (20) and a connecting rod (21); the lifting frame (22) is arranged at the bottom of the separation chamber (4) and has the same size as the bottom of the separation chamber (4); the filter plate (23) is embedded in the top of the lifting frame (22); the cylinder (20) is inverted at the top center of the separation chamber (4), and the output shaft passes through the interior of the separation chamber (4); the connecting rod (21) is arched, with both ends respectively connected to the two sides of the top of the lifting frame (22), and the center of the side is fixed to the output shaft of the cylinder (20); A drain pipe (28) is connected to the bottom of the separation chamber (4) away from the folding tube (25). The drain pipe (28) is also provided with a filter element (6) and a solenoid valve. The other end of the drain pipe (28) passes through the outside of the box body (1). The outside of the box body (1) is also embedded with three observation ports (29) corresponding to the separation chamber (4), the reaction chamber (3) and the concentration chamber (2). The separation chamber (4), the reaction chamber (3) and the concentration chamber (2) are all made of acid-resistant transparent materials.

2. The device for preparing copper sulfate from waste etching solution according to claim 1, wherein: The filter tanks (5) are provided with two and fixed on both sides of the top of the box (1); the buffer tank (7) is located between the two filter tanks (5) and is filled with a buffer, which is ammonia water.

3. The device for preparing copper sulfate from waste etching solution according to claim 1, wherein: The fan (24) is also provided with a heating pipe (9), and the air outlet end is connected to a folding pipe (25), the other end of the folding pipe (25) is plugged into the top of one side of the separation chamber (4), the purifier (26) is fixed to one side of the box (1) and is located above the fan (24), and the air outlet pipe (27) is a three-way pipe, one end of which is connected to the air inlet end of the purifier (26), and the other two ends are connected to the top of the concentration chamber (2) and the separation chamber (4) respectively.

4. A method for preparing copper sulfate from waste etching liquid, applied to the device for preparing copper sulfate from waste etching liquid according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1. Collecting and treating etching waste liquid: collecting the etching waste liquid into a filter tank (5), filtering it through a multi-filter element (6), and then entering the concentration tank (2) through a connecting pipe after filtration; S2, neutralizing the pH value of the etching waste liquid and concentrating the copper ions contained therein: detecting the pH value of the etching waste liquid in the concentration chamber (2) by a pH sensor (11), cooperating with a buffer tank (7) connected to the concentration chamber (2) and equipped with a flow meter (8) and a solenoid valve, quantitatively adding a buffer to adjust the pH value of the etching waste liquid, then heating the area around the concentration chamber (2) by a heating tube (9) to increase the temperature of the etching waste liquid inside, evaporate the water in the etching waste liquid, concentrate the copper ions, and finally enter the reaction chamber (3) through the connecting tube; S3, reacting the copper ions in the etching waste liquid with concentrated sulfuric acid: quantitatively adding concentrated sulfuric acid into the reaction chamber (3) through a concentrated sulfuric acid tank (12) connected to the reaction chamber (3) and equipped with a flow meter (8) and a solenoid valve, reacting with the copper ions to generate copper sulfate, stirring the reaction by a stirring assembly (13) to ensure uniform reaction, and finally entering the separation chamber (4) through a connecting pipe; S4, precipitation and collection of copper sulfate solids: the etching waste liquid containing copper sulfate enters the separation chamber (4) for static precipitation, and the copper sulfate solids will be precipitated on the filter plate (23) at the bottom of the separation chamber (4). After a certain time, the cylinder (20) of the extraction component drives the filter plate (23) to move upward, and the drain pipe (28) with the filter screen is opened to discharge the waste liquid from the drain pipe (28), and the copper sulfate solids are placed on the filter plate (23); S5, drying and collecting the copper sulfate solid: hot air is conveyed into the separation bin (4) by a heated blower (24) to dry the copper sulfate solid, and finally the filter plate (23) is taken out to collect the copper sulfate.

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