Purification device and purification process for acid-making flue gas generated in copper smelting flue gas acid-making process

Abstract

The invention discloses a purification device and a purification process for acid-making flue gas generated in the process of making acid from copper smelting flue gas. The device comprises an electric precipitator, an overflow weir, a primary dynamic wave, a gas cooling tower, a secondary dynamic wave, an electric demister, an accident high-level water tank, a supernate storage tank, an inclined plate settling tank, a plate-and-frame filter press, a sulfur dioxide desorption tower, a waste acid storage tank, a water glass storage tank and a water glass preparation tank. Through dilute acid washing and adiabatic evaporation, the flue gas temperature is efficiently reduced, dust and acid mist in the smelting flue gas are removed, meanwhile, fluorine in the flue gas is removed by adding sodium water glass, and the situation that hydrogen fluoride in the flue gas reacts with a silicon-containing magnetic ring in the dry absorption three-tower to be pulverized, so that a magnetic ring filler collapses is avoided; and system shutdown caused by serious activity reduction due to the fact that vanadium catalysts containing silicon dioxide in a converter are mutually bonded into blocks is avoided. Clean flue gas is provided for subsequent procedures, the production efficiency of the system is effectively improved, the safety of subsequent equipment is protected, and the service life of the subsequent equipment is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of nonferrous metal smelting, and in particular to a purification device and a purification process for acid-making flue gas generated in an acid-making process of copper smelting flue gas. Background Art

[0002] The composition of copper smelting flue gas in the smelting flue gas acid production is relatively complex, containing large amounts of harmful components such as dust and fluorine (their content is closely related to the smelting process and the composition of the original ore). In addition, the flue gas temperature is relatively high, which will have an adverse effect on the dry absorption and conversion processes of the acid production system. Therefore, it must be removed through purification to provide clean flue gas for subsequent processes. Flue gas purification often uses a wet scrubbing process to cool the smelting flue gas and remove dust.

[0003] Patent CN116809235A provides an acid-producing flue gas purification circulation system and method that can reduce dust content in the circulating liquid and improve production efficiency. The process flow employed is: a first-stage dynamic wave - a gas cooling tower - a second-stage dynamic wave - a two-stage electrostatic demister purification method to remove dust, impurities, acid mist, heat, and other elements from the flue gas. The circulation system includes an electrostatic demister, a second-stage dynamic wave, a first-stage dynamic wave, a gas cooling tower, an emergency water high-level tank, and an overflow weir. The liquid outlet of the electrostatic demister is connected to the liquid inlet of the second-stage dynamic wave; the liquid outlet of the second-stage dynamic wave is connected to the liquid inlet of the first-stage dynamic wave; the air inlet of the gas cooling tower is connected to the first-stage dynamic wave; the liquid outlet of the gas cooling tower is connected to the liquid inlet of the emergency water high-level tank; the liquid outlet of the emergency water high-level tank is connected to the liquid inlet of the overflow weir, and the liquid outlet of the overflow weir is connected to the liquid inlet of the first-stage dynamic wave.

[0004] The shortcoming of this method is that the purification method does not mention any process for removing fluorine from the flue gas, which will cause the hydrogen fluoride in the flue gas to react with the silicon-containing magnetic rings in the three dry absorption towers and pulverize, resulting in the collapse of the magnetic ring packing. It will also cause the vanadium catalyst containing silica in the converter to stick to each other and form blocks, seriously reducing its activity.

[0005] Therefore, it is a problem that technicians in this field need to solve to develop a purification device and purification process that can cool the smelting flue gas, remove dust, remove acid mist and fluorine, and at the same time remove the acid sludge formed by mineral dust in the circulating liquid. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention designs a purification device and purification process for acid-making flue gas generated in the process of copper smelting flue gas acid production.

[0007] The present invention adopts the following technical solutions: A device for purifying acid-making flue gas generated in the process of acid-making from copper smelting flue gas, comprising an electrostatic precipitator, an overflow weir, a primary power wave, a gas cooling tower, a secondary power wave, an electrostatic demister, an emergency high-level water tank, a supernatant storage tank, an inclined plate sedimentation tank, a plate and frame filter press, a sulfur dioxide desorption tower, a waste acid storage tank, a water glass storage tank, and a water glass preparation tank; The air inlet pipe of the electrostatic precipitator receives the acid-making flue gas, and the air outlet pipe of the electrostatic precipitator is connected to the overflow weir provided on the top of the first-stage power wave through a pipeline. The air outlet of the first-stage power wave is connected to the air inlet at the bottom of the gas cooling tower through a pipeline. The air outlet at the top of the gas cooling tower is connected to the second-stage power wave through a pipeline. The air outlet of the second-stage power wave is connected to the electrostatic precipitator; The liquid inlet of the secondary power wave is connected to the reclaimed water supply pipeline, the liquid outlet of the secondary power wave is connected to the liquid inlet of the gas cooling tower through a pipeline, the liquid outlet of the gas cooling tower is connected to the liquid inlet of the primary power wave through a pipeline, the liquid outlet of the primary power wave is connected to the inclined plate sedimentation tank through a pipeline, the upper overflow port of the inclined plate sedimentation tank is connected to the supernatant storage tank through a pipeline, the bottom of the inclined plate sedimentation tank is connected to the plate and frame filter press through a pipeline, the supernatant storage tank is respectively connected to the accident high-level water tank and the sulfur dioxide desorption tower through pipelines, the sulfur dioxide desorption tower is connected to the waste acid storage tank through a pipeline, and the bottom of the accident high-level water tank is provided with a pipeline connected to the overflow weir; The water glass storage tank is connected to the water glass preparation tank through a pipeline, and the water glass preparation tank is connected to the secondary power wave through a pipeline.

[0008] Preferably, the gas cooling tower is provided with a liquid circulation pipeline, the liquid circulation pipeline is connected to a plate heat exchanger, and heat is exchanged with circulating cooling water through the plate heat exchanger for cooling.

[0009] Preferably, the first-level power wave is connected to a first-level power wave reverse nozzle, and the first-level power wave reverse nozzle is connected to a first-level power wave circulation pump.

[0010] Preferably, the secondary power wave is connected to a secondary power wave reverse nozzle, and the secondary power wave reverse nozzle is connected to a secondary power wave circulation pump.

[0011] Preferably, a gas cooling tower circulation pump is installed on the liquid circulation pipeline.

[0012] Preferably, the output end of the waste acid storage tank is connected to the waste acid removal process pipeline through a waste acid circulation pump.

[0013] Preferably, the output end of the supernatant storage tank is connected to a supernatant circulation pump.

[0014] Preferably, a delivery pump is installed on the connecting pipeline between the water glass preparation tank and the secondary power wave.

[0015] Preferably, a first-stage power wave extraction pump is installed on the connecting pipeline between the first-stage power wave and the inclined plate sedimentation tank, and a low-flow filter pressure pump is installed on the connecting pipeline between the inclined plate sedimentation tank and the plate and frame filter press.

[0016] A process for purifying acid-making flue gas generated in the copper smelting flue gas acid-making process, the process steps of which are as follows: S1. The acid-making flue gas generated in the copper smelting flue gas acid-making process is evenly fed into the four electric fields of the electrostatic precipitator through the adjustment of the bell valve on the inlet of the electrostatic precipitator. By adjusting the secondary voltage, most of the large particles of smoke and dust in the flue gas are removed under the action of the electrostatic field of the electrostatic precipitator; S2. The high-temperature flue gas from the electrostatic precipitator is 250°C. The circulating liquid that enters the overflow weir at the top of the first-stage power wave and collides with the reverse spray of the first-stage power wave at the output of the reverse spray pipe of the first-stage power wave to form a foam layer. The water in the circulating liquid is adiabatically evaporated, and the latent heat of evaporation during evaporation reduces the flue gas temperature to ≤73°C. At the same time, the circulating liquid in the high-level water tank overflows the overflow weir and forms a water film on the reverse spray pipe of the first-stage power wave. S3. The flue gas from the first-stage power wave enters the bottom of the gas cooling tower and contacts the circulating liquid flowing evenly through the acid separator at the gas cooling tower filler, reducing the temperature and dust content of the flue gas. At the same time, the circulating liquid with a higher temperature after contact is transferred to the circulating cooling water through the plate heat exchanger; S4. The flue gas from the gas cooling tower enters from the top of the secondary power wave, collides with the circulating fluid sprayed back from the secondary power wave reverse nozzle, and is cooled and dusted again. Since water glass is added to the secondary power wave circulating fluid, sodium silicate combines with fluoride ions to form sodium fluorosilicate precipitation, removing fluorine from the flue gas and making the fluorine content in the flue gas ≤0.003g / m³; S5. The flue gas coming out of the secondary power wave enters the electric precipitator from the bottom, and the acid mist in the flue gas is removed under the action of the high-voltage electrostatic field, so that the acid mist content in the flue gas is ≤0.005g / m³; S6. The circulating liquid enters the secondary power wave through the reclaimed water supply pipeline. The water glass in the water glass storage tank is transported to the water glass preparation tank through a delivery pump. The prepared water glass solution is transported to the circulating liquid of the secondary power wave. The circulating liquid in the secondary power wave utilizes the potential difference to circulate the liquid through the balancing pipe series to the gas cooling tower, and then circulates the liquid from the gas cooling tower through the balancing pipe series to the primary power wave. The liquid level of the primary power wave is controlled between 2.3m and 3.2m. The circulating liquid in the primary power wave is transported to the inclined plate sedimentation tank by the primary power wave extraction pump. The upper clear liquid in the inclined plate sedimentation tank overflows into the supernatant storage tank, and then a part of the circulating liquid is transported to the emergency high-level tank through the supernatant circulation pump and valve control to overflow back to the primary power wave for recycling. The other part of the circulating liquid is transported to the sulfur dioxide desorption tower to remove sulfur dioxide, and then flows into the waste acid storage tank to be sent to the waste acid process for treatment. The acid sludge at the bottom of the inclined plate sedimentation tank is sent to the plate and frame filter press for slag pressing and then returned to the furnace.

[0017] The present invention has the following beneficial effects: through dilute acid scrubbing and adiabatic evaporation, it efficiently reduces flue gas temperature and removes dust and acid mist from smelting flue gas. Simultaneously, by adding sodium water glass, it removes fluorine from the flue gas, thus preventing hydrogen fluoride in the flue gas from reacting with the silicon-containing magnetic rings in the three dry absorption towers, causing the magnetic ring packing to collapse and clumping with the silicon dioxide-containing vanadium catalyst in the converter, leading to a serious decrease in activity and system shutdown. This not only provides clean flue gas for subsequent processes, but also effectively improves system production efficiency, protects the safety of subsequent equipment, and extends its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a device for purifying acid-making flue gas generated in the process of acid-making from copper smelting flue gas according to the present invention; Figure 2 This is a process flow chart for purifying acid-making flue gas generated in the process of acid-making from copper smelting flue gas according to the present invention; In the figure: 1. Electrostatic precipitator, 2. Overflow weir, 3. Primary power wave, 4. Gas cooling tower, 5. Secondary power wave, 6. Electrostatic demister, 7. Emergency high-level water tank, 8. Supernatant storage tank, 9. Inclined plate sedimentation tank, 10. Plate and frame filter press, 11. Sulfur dioxide desorption tower, 12. Waste acid storage tank, 13. Plate heat exchanger, 14. Sodium silicate storage tank, 15. Sodium silicate preparation tank, 16. Primary power wave circulation pump, 17. Gas cooling tower circulation pump, 18. Secondary power wave circulation pump, 19. Delivery pump, 20. Primary power wave extraction pump, 21. Low-flow filter pressure pump, 22. Supernatant circulation pump, 23. Waste acid circulation pump. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings: Example: Figure 1As shown, a purification device for acid-making flue gas generated in the process of copper smelting flue gas acid production includes an electrostatic precipitator 1, an overflow weir 2, a primary power wave 3, a gas cooling tower 4, a secondary power wave 5, an electrostatic demister 6, an emergency high-level water tank 7, a supernatant storage tank 8, an inclined plate sedimentation tank 9, a plate and frame filter press 10, a sulfur dioxide desorption tower 11, a waste acid storage tank 12, a plate heat exchanger 13, a water glass storage tank 14, and a water glass preparation tank 15; The air inlet pipe of the electrostatic precipitator receives the acid-making flue gas, and the air outlet pipe of the electrostatic precipitator is connected to the overflow weir provided on the top of the first-stage power wave through a pipeline. The air outlet of the first-stage power wave is connected to the air inlet at the bottom of the gas cooling tower through a pipeline. The air outlet at the top of the gas cooling tower is connected to the second-stage power wave through a pipeline. The air outlet of the second-stage power wave is connected to the electrostatic precipitator; The liquid inlet of the secondary power wave is connected to the reclaimed water supply pipeline, the liquid outlet of the secondary power wave is connected to the liquid inlet of the gas cooling tower through a pipeline, the liquid outlet of the gas cooling tower is connected to the liquid inlet of the primary power wave through a pipeline, the liquid outlet of the primary power wave is connected to the inclined plate sedimentation tank through a pipeline, the upper overflow port of the inclined plate sedimentation tank is connected to the supernatant storage tank through a pipeline, the bottom of the inclined plate sedimentation tank is connected to the plate and frame filter press through a pipeline, the supernatant storage tank is respectively connected to the accident high-level water tank and the sulfur dioxide desorption tower through pipelines, the sulfur dioxide desorption tower is connected to the waste acid storage tank through a pipeline, and the bottom of the accident high-level water tank is provided with a pipeline connected to the overflow weir; The water glass storage tank is connected to the water glass preparation tank via a pipeline, and the water glass preparation tank is connected to the secondary power wave via a pipeline. The gas cooling tower is equipped with a liquid circulation pipeline, which is connected to a plate heat exchanger, and the liquid is cooled by heat exchange with circulating cooling water through the plate heat exchanger.

[0020] The first-stage power wave is connected with a first-stage power wave reverse nozzle, and the first-stage power wave reverse nozzle is connected with a first-stage power wave circulation pump 16. The second-stage power wave is connected with a second-stage power wave reverse nozzle, and the second-stage power wave reverse nozzle is connected with a second-stage power wave circulation pump 18.

[0021] The liquid circulation pipeline is equipped with a gas cooling tower circulation pump 17. The output of the waste acid storage tank is connected to the waste acid removal process pipeline via a waste acid circulation pump 23. The output of the supernatant storage tank is connected to a supernatant circulation pump 22. A delivery pump 19 is installed in the connecting pipeline between the water glass preparation tank and the secondary power wave.

[0022] A first-stage power wave extraction pump 20 is installed on the connecting pipeline between the first-stage power wave and the inclined plate sedimentation tank, and a low-flow filter pressure pump 21 is installed on the connecting pipeline between the inclined plate sedimentation tank and the plate and frame filter press.

[0023] like Figure 2 As shown, the purification process of the acid-making flue gas purification device generated in the copper smelting flue gas acid-making process is: S1. The acid-making flue gas at 296.4℃ generated in the process of acid-making from copper smelting flue gas is sequentially passed through four electric fields with secondary voltages of 55KV, 51KV, 52KV and 49KV for dust removal, and then transported to the first-level power wave through the bell valve control and flue gas pipeline.

[0024] S2. The temperature of the flue gas from the electrostatic precipitator before entering the overflow weir at the top of the first-stage power wave is 249°C. At this time, the liquid level of the accident high-level water tank is 2736mm, and the flow rate from its bottom to the overflow weir is 114m³ / h. The overflowing circulating liquid forms a water film at the first-stage power wave reverse nozzle to protect the reverse nozzle. After the flue gas contacts the circulating liquid sprayed up by the pump in the first-stage power wave reverse nozzle and evaporates adiabatically, the flue gas temperature drops to 61.1°C.

[0025] S3. Flue gas at 61.1°C from the outlet of the first power wave enters the bottom of the gas cooling tower. It comes into contact with circulating liquid flowing evenly through the acid distributor at the gas cooling tower filler, reducing the flue gas temperature to 32.5°C before being sent to the second power wave. After contact with the flue gas, the circulating liquid temperature rises to 41.6°C. After heat removal through the plate heat exchanger, the temperature is reduced to 31.7°C before being sent back to the gas cooling tower for recycling.

[0026] S4. Flue gas from the gas cooling tower enters from the top of the secondary power wave and collides with the circulating fluid sprayed up from the reverse direction. Since water glass (sodium silicate Na2*xOSiO2*y H2O) is added to the circulating fluid of the secondary power wave, sodium silicate combines with fluoride ions to form sodium fluorosilicate precipitation. 4HF + SiO2 == SiF4 + 2H2O; SiF4 + 2HF == H2SiF6. SiO2 2- +6HF == SiF6 2- + 3H2O; SiF6 2- +2Na + ==Na2SiF6. After testing, the fluorine content in the flue gas after fluorine removal was 0.0025g / m³, and the flue gas temperature dropped to 31.7℃.

[0027] S5. The flue gas from the secondary power wave enters the electrostatic precipitator from the bottom. The acid mist in the flue gas is removed under the action of the high-voltage electrostatic field. After the acid mist is removed, the flue gas is tested and the acid mist content is 0.002 g / m³.

[0028] S6. After the flue gas passes through the purification process, the flue gas temperature drops to 26.8℃, the dust content in the flue gas is 0.0015 g / m³, the fluorine content in the flue gas is 0.0025 g / m³, and the acid mist content in the flue gas is 0.002 g / m³.

[0029] S7, the circulating liquid water supply valve is at the secondary power wave, with an opening of 20% and a flow rate of 2.7 m³ / h. The liquid levels in the secondary power wave, gas cooling tower, and primary power wave are 3256mm, 3021mm, and 3007mm, respectively. The circulating liquid in the primary power wave is pumped to the inclined plate settling tank. The supernatant overflows into the supernatant storage tank (liquid level 3094mm). A portion of the circulating liquid is then pumped to the emergency high-level tank (liquid level 2736mm) through pump and valve control. The overflow (flow rate 114 m³ / h) returns to the primary power wave for recycling. The remaining circulating liquid is pumped to the sulfur dioxide stripping tower to remove sulfur dioxide, then flows into the spent acid storage tank for treatment in the spent acid process. The acid sludge at the bottom of the inclined plate settling tank is sent to the plate and frame filter press for slag reduction and return to the furnace.

[0030] The embodiment described above is only a preferred solution of the present invention and does not limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solution described in the claims.

Claims

1. A device for purifying acid-making flue gas generated in the process of copper smelting flue gas acid production, characterized in that: It includes an electrostatic precipitator, an overflow weir, a primary power wave, a gas cooling tower, a secondary power wave, an electrostatic demister, an emergency high-level water tank, a supernatant storage tank, an inclined plate sedimentation tank, a plate and frame filter press, a sulfur dioxide desorption tower, a waste acid storage tank, a water glass storage tank, and a water glass preparation tank; The air inlet pipe of the electrostatic precipitator receives the acid-making flue gas, and the air outlet pipe of the electrostatic precipitator is connected to the overflow weir provided on the top of the first-stage power wave through a pipeline. The air outlet of the first-stage power wave is connected to the air inlet at the bottom of the gas cooling tower through a pipeline. The air outlet at the top of the gas cooling tower is connected to the second-stage power wave through a pipeline. The air outlet of the second-stage power wave is connected to the electrostatic precipitator; The liquid inlet of the secondary power wave is connected to the reclaimed water supply pipeline, the liquid outlet of the secondary power wave is connected to the liquid inlet of the gas cooling tower through a pipeline, the liquid outlet of the gas cooling tower is connected to the liquid inlet of the primary power wave through a pipeline, the liquid outlet of the primary power wave is connected to the inclined plate sedimentation tank through a pipeline, the upper overflow port of the inclined plate sedimentation tank is connected to the supernatant storage tank through a pipeline, the bottom of the inclined plate sedimentation tank is connected to the plate and frame filter press through a pipeline, the supernatant storage tank is respectively connected to the accident high-level water tank and the sulfur dioxide desorption tower through pipelines, the sulfur dioxide desorption tower is connected to the waste acid storage tank through a pipeline, and the bottom of the accident high-level water tank is provided with a pipeline connected to the overflow weir; The water glass storage tank is connected to the water glass preparation tank through a pipeline, and the water glass preparation tank is connected to the secondary power wave through a pipeline.

2. The device for purifying acid-making flue gas generated in the copper smelting flue gas acid-making process according to claim 1 is characterized in that: The gas cooling tower is provided with a liquid circulation pipeline, and a plate heat exchanger is connected to the liquid circulation pipeline, and heat is exchanged with circulating cooling water through the plate heat exchanger for cooling.

3. The device for purifying acid-making flue gas generated in the process of acid-making from copper smelting flue gas according to claim 1, characterized in that: The first-level power wave is connected to a first-level power wave reverse nozzle, and the first-level power wave reverse nozzle is connected to a first-level power wave circulation pump.

4. The device for purifying acid-making flue gas generated in the process of acid-making from copper smelting flue gas according to claim 1, characterized in that: The secondary power wave is connected to a secondary power wave reverse nozzle, and the secondary power wave reverse nozzle is connected to a secondary power wave circulation pump.

5. The device for purifying acid-making flue gas generated in the process of acid-making from copper smelting flue gas according to claim 2, characterized in that: A gas cooling tower circulation pump is installed on the liquid circulation pipeline.

6. The device for purifying acid-making flue gas generated in the process of acid-making from copper smelting flue gas according to claim 1, characterized in that: The output end of the waste acid storage tank is connected to the waste acid removal process pipeline through a waste acid circulation pump.

7. The device for purifying acid-making flue gas generated in the copper smelting flue gas acid-making process according to claim 1, characterized in that: The output end of the supernatant storage tank is connected to a supernatant circulation pump.

8. The device for purifying acid-making flue gas generated in the process of acid-making from copper smelting flue gas according to claim 1, characterized in that: A delivery pump is installed on the connecting pipeline between the water glass preparation tank and the secondary power wave.

9. The device for purifying acid-making flue gas generated in the process of acid-making from copper smelting flue gas according to claim 1, characterized in that: A first-stage power wave extraction pump is installed on the connecting pipeline between the first-stage power wave and the inclined plate sedimentation tank, and a low-flow filter pressure pump is installed on the connecting pipeline between the inclined plate sedimentation tank and the plate and frame filter press.

10. A process for purifying acid-making flue gas generated in the process of acid-making from copper smelting flue gas, characterized by: The process steps are: S1. The acid-making flue gas generated in the copper smelting flue gas acid-making process is evenly fed into the four electric fields of the electrostatic precipitator through the adjustment of the bell valve on the inlet of the electrostatic precipitator. By adjusting the secondary voltage, most of the large particles of smoke and dust in the flue gas are removed under the action of the electrostatic field of the electrostatic precipitator; S2. The high-temperature flue gas from the electrostatic precipitator is 250°C. The circulating liquid that enters the overflow weir at the top of the first-stage power wave and collides with the reverse spray of the first-stage power wave at the output of the reverse spray pipe of the first-stage power wave to form a foam layer. The water in the circulating liquid is adiabatically evaporated, and the latent heat of evaporation during evaporation reduces the flue gas temperature to ≤73°C. At the same time, the circulating liquid in the high-level water tank overflows the overflow weir and forms a water film on the reverse spray pipe of the first-stage power wave. S3. The flue gas from the first-stage power wave enters the bottom of the gas cooling tower and contacts the circulating liquid flowing evenly through the acid separator at the gas cooling tower filler, reducing the temperature and dust content of the flue gas. At the same time, the circulating liquid with a higher temperature after contact is transferred to the circulating cooling water through the plate heat exchanger; S4. The flue gas from the gas cooling tower enters from the top of the secondary power wave, collides with the circulating fluid sprayed back from the secondary power wave reverse nozzle, and is cooled and dusted again. Since water glass is added to the secondary power wave circulating fluid, sodium silicate combines with fluoride ions to form sodium fluorosilicate precipitation, removing fluorine from the flue gas and making the fluorine content in the flue gas ≤0.003g / m³; S5. The flue gas coming out of the secondary power wave enters the electric precipitator from the bottom, and the acid mist in the flue gas is removed under the action of the high-voltage electrostatic field, so that the acid mist content in the flue gas is ≤0.005g / m³; S6. The circulating liquid enters the secondary power wave through the reclaimed water supply pipeline. The water glass in the water glass storage tank is transported to the water glass preparation tank through a delivery pump. The prepared water glass solution is transported to the circulating liquid of the secondary power wave. The circulating liquid in the secondary power wave utilizes the potential difference to circulate the liquid through the balancing pipe series to the gas cooling tower, and then circulates the liquid from the gas cooling tower through the balancing pipe series to the primary power wave. The liquid level of the primary power wave is controlled between 2.3m and 3.2m. The circulating liquid in the primary power wave is transported to the inclined plate sedimentation tank by the primary power wave extraction pump. The upper clear liquid in the inclined plate sedimentation tank overflows into the supernatant storage tank, and then a part of the circulating liquid is transported to the emergency high-level tank through the supernatant circulation pump and valve control to overflow back to the primary power wave for recycling. The other part of the circulating liquid is transported to the sulfur dioxide desorption tower to remove sulfur dioxide, and then flows into the waste acid storage tank to be sent to the waste acid process for treatment. The acid sludge at the bottom of the inclined plate sedimentation tank is sent to the plate and frame filter press for slag pressing and then returned to the furnace.

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