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

Abstract

The utility model discloses a device for purifying acid-making flue gas generated in an acid-making process of 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. The flue gas temperature is efficiently reduced through dilute acid washing and adiabatic evaporation, 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 third 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] This utility model relates to the field of non-ferrous metal smelting technology, and in particular to a purification device for acid-producing flue gas generated during the copper smelting flue gas acid production process. Background Technology

[0002] The composition of copper smelting flue gas used in acid production is complex, containing large amounts of harmful components such as dust and fluorine (the content of which is highly dependent on the smelting process and the composition of the raw ore). Furthermore, the flue gas temperature is high, which can adversely affect the dry absorption and conversion processes of the acid production system. Therefore, purification is essential to remove these harmful components and provide clean flue gas for subsequent processes. Flue gas purification often employs wet scrubbing processes to cool and remove dust from the smelting flue gas.

[0003] Patent CN116809235A provides a purification circulation system and method for acid production flue gas, which can reduce the dust content of circulating liquid and improve production efficiency. The process flow is as follows: a primary power wave—gas cooling tower—secondary power wave—two-stage electrostatic precipitator purification method removes dust, impurities, acid mist, heat, etc. from the flue gas. The circulation system includes: an electrostatic precipitator, a secondary power wave, a primary power wave, a gas cooling tower, an emergency water high-level tank, and an overflow weir. The outlet of the electrostatic precipitator is connected to the inlet of the secondary power wave; the outlet of the secondary power wave is connected to the inlet of the primary power wave; the inlet of the gas cooling tower is connected to the primary power wave; the outlet of the gas cooling tower is connected to the inlet of the emergency water high-level tank; the outlet of the emergency water high-level tank is connected to the inlet of the overflow weir; and the outlet of the overflow weir is connected to the inlet of the primary power wave.

[0004] The drawback of this method is that it does not mention any process for removing fluorine from the flue gas. This will cause the hydrogen fluoride in the flue gas to react with the silicon-containing magnetic rings in the dry absorption tower and pulverize, leading to the collapse of the magnetic ring packing. It will also cause the vanadium catalyst containing silicon dioxide in the converter to stick together and clump together, resulting in a serious decrease in activity.

[0005] Therefore, developing a purification device that can cool, remove dust, remove acid mist and fluoride from smelting flue gas, and remove acid sludge formed by mineral dust from circulating liquid is a problem that needs to be solved by those skilled in the art. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model designs a purification device for acid-producing flue gas generated during the copper smelting flue gas acid production process.

[0007] The present invention adopts the following technical solution:

[0008] A purification device for acid production flue gas generated during the copper smelting flue gas acid production process includes an electrostatic precipitator, an overflow weir, a primary power wave, a gas cooling tower, a secondary power wave, an electrostatic precipitator, an emergency high-level water tank, a supernatant 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.

[0009] The inlet pipe of the electrostatic precipitator receives the acid-producing flue gas, and the outlet pipe of the electrostatic precipitator is connected to the overflow weir set at the top of the first-stage power wave through a pipeline. The outlet of the first-stage power wave is connected to the inlet at the bottom of the gas cooling tower through a pipeline. The outlet at the top of the gas cooling tower is connected to the second-stage power wave through a pipeline. The outlet of the second-stage power wave is connected to the electrostatic precipitator.

[0010] The inlet of the secondary power wave is connected to the reclaimed water supply pipeline, the outlet of the secondary power wave is connected to the inlet of the gas cooling tower through a pipeline, the outlet of the gas cooling tower is connected to the inlet of the primary power wave through a pipeline, the outlet of the primary power wave is connected to the inclined plate settling tank through a pipeline, the overflow outlet at the top of the inclined plate settling tank is connected to the supernatant storage tank through a pipeline, the bottom of the inclined plate settling tank is connected to the plate and frame filter press through a pipeline, the supernatant storage tank is connected to the emergency high-level water tank and the sulfur dioxide desorption tower through pipelines respectively, the sulfur dioxide desorption tower is connected to the waste acid storage tank through a pipeline, and the bottom of the emergency high-level water tank is connected to the overflow weir through a pipeline.

[0011] The water glass storage tank is connected to the water glass preparation tank via pipelines, and the water glass preparation tank is connected to the secondary dynamic wave via pipelines.

[0012] Preferably, the gas cooling tower is equipped with a liquid circulation pipeline, and a plate heat exchanger is connected to the liquid circulation pipeline to exchange heat with the circulating cooling water.

[0013] Preferably, a first-stage power wave reverse nozzle is connected to the first-stage power wave, and a first-stage power wave circulation pump is connected to the first-stage power wave reverse nozzle.

[0014] Preferably, a secondary power wave reverse nozzle is connected to the secondary power wave, and a secondary power wave circulation pump is connected to the secondary power wave reverse nozzle.

[0015] Preferably, a gas cooling tower circulation pump is installed on the liquid circulation pipeline.

[0016] Preferably, the output end of the waste acid storage tank is connected to the waste acid removal process pipeline via a waste acid circulation pump.

[0017] Preferably, the output end of the supernatant storage tank is connected to a supernatant circulation pump.

[0018] Preferably, a delivery pump is installed on the connecting pipeline between the water glass preparation tank and the secondary dynamic wave.

[0019] Preferably, a primary power wave extraction pump is installed on the connecting pipeline between the primary power wave and the inclined plate settling tank, and a low-flow filter press pump is installed on the connecting pipeline between the inclined plate settling tank and the plate and frame filter press.

[0020] The purification process for the acid-producing flue gas generated during the copper smelting flue gas acid production process includes the following steps:

[0021] S1. The acid-making flue gas generated during the copper smelting flue gas acid production process is regulated by the inlet bell valve of the electrostatic precipitator and evenly enters the four electric fields of the electrostatic precipitator. By adjusting the secondary voltage, most of the large particulate dust in the flue gas is removed under the action of the electrostatic field of the electrostatic precipitator.

[0022] S2. The high-temperature flue gas from the electrostatic precipitator is 250℃. It enters from the overflow weir at the top of the first-stage power wave through the bell valve and collides with the circulating liquid sprayed up from 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 evaporated through adiabatic evaporation. The latent heat of evaporation during evaporation reduces the temperature of the flue gas to ≤73℃. At the same time, the circulating liquid in the high-level water tank overflows from the overflow weir and forms a water film on the reverse spray pipe of the first-stage power wave.

[0023] S3. The flue gas from the first-stage power wave enters from the bottom of the gas cooling tower and comes into contact with the circulating liquid that flows down evenly through the acid separator at the packing of the gas cooling tower, reducing the temperature and dust content of the flue gas. At the same time, the circulating liquid, whose temperature rises after contact, transfers the temperature of the circulating liquid to the circulating cooling water through the plate heat exchanger.

[0024] S4. The flue gas from the gas cooling tower enters from the top of the secondary power wave and collides with the circulating liquid sprayed up from the reverse nozzle of the secondary power wave, which cools down and removes dust again. Since water glass is added to the circulating liquid of the secondary power wave, sodium silicate combines with fluoride ions to form sodium fluorosilicate precipitate, which removes fluoride from the flue gas and makes the fluoride content in the flue gas ≤0.003g / m³.

[0025] S5. The flue gas from the secondary power wave enters the electrostatic precipitator from the bottom. Under the action of the high-voltage electrostatic field, the acid mist in the flue gas is removed, so that the acid mist content in the flue gas is ≤0.005g / m³.

[0026] S6. The circulating liquid enters the secondary dynamic wave through the water replenishment pipeline. The water glass in the water glass storage tank is transported to the water glass preparation tank by the transfer pump. The prepared water glass solution is then transported to the circulating liquid in the secondary dynamic wave. The circulating liquid in the secondary dynamic wave uses the level difference to circulate through the balance pipe to the gas cooling tower, and then from the gas cooling tower, it uses the level difference to circulate through the balance pipe to the primary dynamic wave. The liquid level in the primary dynamic wave is controlled between 2.3m and 3.2m. The circulating liquid in the primary dynamic wave is transported to the inclined plate settling tank by the primary dynamic wave extraction pump. The upper clear liquid in the inclined plate settling tank overflows into the supernatant storage tank. Then, through the supernatant circulation pump and valve control, a portion of the circulating liquid is transported to the emergency high-level tank and overflows back into the primary dynamic wave for recycling. The other portion 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 for waste acid processing. The acid sludge at the bottom of the inclined plate settling tank is sent to the plate and frame filter press for slag pressing and then back to the furnace.

[0027] The beneficial effects of this invention are as follows: This invention efficiently reduces flue gas temperature and removes dust and acid mist from smelting flue gas through dilute acid washing and adiabatic evaporation. Simultaneously, the addition of sodium silicate removes fluoride from the flue gas, preventing the hydrogen fluoride in the flue gas from reacting with the silicon-containing magnetic rings in the dry absorption tower, causing pulverization and collapse of the magnetic ring packing, and avoiding the adhesion of the vanadium catalyst containing silicon dioxide in the converter into lumps, which would severely reduce its activity and lead to system shutdown. This not only provides clean flue gas for subsequent processes but also effectively improves system production efficiency, protects the safety of downstream equipment, and extends its service life. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the purification device for acid production flue gas generated during the copper smelting flue gas acid production process of this utility model.

[0029] Figure 2 This is a process flow diagram of the purification process for acid production flue gas generated during the copper smelting flue gas acid production process of this utility model.

[0030] In the diagram: 1. Electrostatic precipitator, 2. Overflow weir, 3. Primary power wave, 4. Gas cooling tower, 5. Secondary power wave, 6. Electrostatic precipitator, 7. Emergency high-level water tank, 8. Supernatant storage tank, 9. Inclined plate settling tank, 10. Plate and frame filter press, 11. Sulfur dioxide desorption tower, 12. Waste acid storage tank, 13. Plate heat exchanger, 14. Water glass storage tank, 15. Water glass preparation tank, 16. Primary power wave circulation pump, 17. Gas cooling tower circulation pump, 18. Secondary power wave circulation pump, 19. Transfer pump, 20. Primary power wave extraction pump, 21. Low-flow pressure filter pump, 22. Supernatant circulation pump, 23. Waste acid circulation pump. Detailed Implementation

[0031] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0032] Example: Figure 1 As shown, a purification device for acid-producing flue gas generated during the copper smelting flue gas acid production process 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 precipitator 6, an emergency high-level water tank 7, a supernatant storage tank 8, an inclined plate settling 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.

[0033] The inlet pipe of the electrostatic precipitator receives the acid-producing flue gas, and the outlet pipe of the electrostatic precipitator is connected to the overflow weir set at the top of the first-stage power wave through a pipeline. The outlet of the first-stage power wave is connected to the inlet at the bottom of the gas cooling tower through a pipeline. The outlet at the top of the gas cooling tower is connected to the second-stage power wave through a pipeline. The outlet of the second-stage power wave is connected to the electrostatic precipitator.

[0034] The inlet of the secondary power wave is connected to the reclaimed water supply pipeline, the outlet of the secondary power wave is connected to the inlet of the gas cooling tower through a pipeline, the outlet of the gas cooling tower is connected to the inlet of the primary power wave through a pipeline, the outlet of the primary power wave is connected to the inclined plate settling tank through a pipeline, the overflow outlet at the top of the inclined plate settling tank is connected to the supernatant storage tank through a pipeline, the bottom of the inclined plate settling tank is connected to the plate and frame filter press through a pipeline, the supernatant storage tank is connected to the emergency high-level water tank and the sulfur dioxide desorption tower through pipelines respectively, the sulfur dioxide desorption tower is connected to the waste acid storage tank through a pipeline, and the bottom of the emergency high-level water tank is connected to the overflow weir through a pipeline.

[0035] The water glass storage tank is connected to the water glass preparation tank via pipelines, and the water glass preparation tank is connected to the secondary power wave via pipelines. The gas cooling tower is equipped with a liquid circulation pipeline, which is connected to a plate heat exchanger for heat exchange and cooling with the circulating cooling water.

[0036] A primary power wave reverse nozzle is connected to the primary power wave, and a primary power wave circulation pump 16 is connected to the primary power wave reverse nozzle. A secondary power wave reverse nozzle is connected to the secondary power wave, and a secondary power wave circulation pump 18 is connected to the secondary power wave reverse nozzle.

[0037] A gas cooling tower circulation pump 17 is installed on the liquid circulation pipeline. The output end of the waste acid storage tank is connected to the waste acid process pipeline via a waste acid circulation pump 23. The output end of the supernatant storage tank is connected to a supernatant circulation pump 22. A transfer pump 19 is installed on the connecting pipeline between the water glass preparation tank and the secondary dynamic wave.

[0038] A primary power wave extraction pump 20 is installed on the connecting pipeline between the primary power wave and the inclined plate settling tank, and a low-flow filter press pump 21 is installed on the connecting pipeline between the inclined plate settling tank and the plate and frame filter press.

[0039] like Figure 2 As shown, the purification process of the acid-producing flue gas purification device generated during the copper smelting flue gas acid production process is as follows:

[0040] S1. The acid-producing flue gas at 296.4℃ generated during the copper smelting flue gas acid production process is sequentially passed through four electric fields with secondary voltages of 55KV, 51KV, 52KV and 49KV respectively for dust removal, and then transported to the primary power wave through the control of the bell valve and flue gas pipeline.

[0041] 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℃. At this time, the liquid level of the 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 reverse nozzle of the first-stage power wave to protect the reverse nozzle. After the flue gas comes into contact with the circulating liquid reversed by the pump in the first-stage power wave reverse nozzle and undergoes adiabatic evaporation, the flue gas temperature drops to 61.1℃.

[0042] S3. Flue gas at 61.1°C from the primary power wave outlet enters from the bottom of the gas cooling tower. It comes into contact with the circulating liquid flowing uniformly down through the acid separator at the gas cooling tower packing. After the flue gas temperature drops to 32.5°C, it is sent to the secondary power wave. The circulating liquid temperature rises to 41.6°C after contact with the flue gas. After heat transfer through a plate heat exchanger, the temperature drops to 31.7°C and is then returned to the gas cooling tower for recycling.

[0043] S4. The flue gas from the gas cooling tower enters from the top of the secondary dynamic wave and collides with the circulating liquid coming up from the reverse jet. Since water glass (sodium silicate Na2*xOSiO2*y H2O) is added to the circulating liquid of the secondary dynamic wave, sodium silicate combines with fluoride ions to form sodium fluorosilicate precipitate: 4HF + SiO2== SiF4+ 2H2O; SiF4+2HF== H2SiF6.

[0044] SiO2 2- +6HF == SiF6 2- + 3H2O; SiF6 2- +2Na + ==Na2SiF6. After defluorination, the fluoride content in the flue gas was found to be 0.0025 g / m³, and the flue gas temperature dropped to 31.7℃.

[0045] S5. The flue gas from the secondary power wave enters the electrostatic precipitator from the bottom. Under the action of the high-voltage electrostatic field, the acid mist in the flue gas is removed. After the acid mist is removed, the flue gas is tested and the acid mist content is found to be 0.002 g / m³.

[0046] 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.

[0047] S7. The circulating liquid water inlet valve is at the secondary power wave, with an opening of 20% and a flow rate of 2.7 m³ / h. The liquid levels of the secondary power wave, gas cooling tower, and primary power wave are 3256 mm, 3021 mm, and 3007 mm, respectively. The circulating liquid in the primary power wave is pumped to the inclined plate settling tank. The upper clear liquid overflows into the upper clear liquid storage tank (liquid level 3094 mm). Then, through pump and valve control, a portion of the circulating liquid is pumped to the emergency high-level tank (liquid level 2736 mm) and overflows (flow rate 114 m³ / h) back to the primary power wave for recycling. The other portion of the circulating liquid is pumped to the sulfur dioxide desorption tower to remove sulfur dioxide and then flows into the waste acid storage tank for waste acid processing. The acid sludge at the bottom of the inclined plate settling tank is sent to the plate and frame filter press for slag pressing and then back to the furnace.

[0048] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. A purification device for acid-producing flue gas generated during the copper smelting flue gas acid production process, characterized in that, It includes electrostatic precipitators, overflow weirs, primary power wave systems, gas cooling towers, secondary power wave systems, electrostatic precipitators, emergency high-level water tanks, supernatant storage tanks, inclined plate settling tanks, plate and frame filter presses, sulfur dioxide desorption towers, waste acid storage tanks, water glass storage tanks, and water glass preparation tanks; The inlet pipe of the electrostatic precipitator receives the acid-producing flue gas, and the outlet pipe of the electrostatic precipitator is connected to the overflow weir set at the top of the first-stage power wave through a pipeline. The outlet of the first-stage power wave is connected to the inlet at the bottom of the gas cooling tower through a pipeline. The outlet at the top of the gas cooling tower is connected to the second-stage power wave through a pipeline. The outlet of the second-stage power wave is connected to the electrostatic precipitator. The inlet of the secondary power wave is connected to the reclaimed water supply pipeline, the outlet of the secondary power wave is connected to the inlet of the gas cooling tower through a pipeline, the outlet of the gas cooling tower is connected to the inlet of the primary power wave through a pipeline, the outlet of the primary power wave is connected to the inclined plate settling tank through a pipeline, the overflow outlet at the top of the inclined plate settling tank is connected to the supernatant storage tank through a pipeline, the bottom of the inclined plate settling tank is connected to the plate and frame filter press through a pipeline, the supernatant storage tank is connected to the emergency high-level water tank and the sulfur dioxide desorption tower through pipelines respectively, the sulfur dioxide desorption tower is connected to the waste acid storage tank through a pipeline, and the bottom of the emergency high-level water tank is connected to the overflow weir through a pipeline. The water glass storage tank is connected to the water glass preparation tank via pipelines, and the water glass preparation tank is connected to the secondary dynamic wave via pipelines.

2. The purification device for acid-producing flue gas generated during the copper smelting flue gas acid production process according to claim 1, characterized in that, The gas cooling tower is equipped with a liquid circulation pipeline, and a plate heat exchanger is connected to the liquid circulation pipeline. The plate heat exchanger exchanges heat with the circulating cooling water for cooling.

3. The purification device for acid-producing flue gas generated during the copper smelting flue gas acid production process according to claim 1, characterized in that, A primary power wave reverse nozzle is connected to the primary power wave, and a primary power wave circulation pump is connected to the primary power wave reverse nozzle.

4. The purification device for acid-producing flue gas generated during the copper smelting flue gas acid production process 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 circulation pump is connected to the secondary power wave reverse nozzle.

5. A purification device for acid-producing flue gas generated during copper smelting flue gas production according to claim 2, characterized in that, A gas cooling tower circulation pump is installed on the liquid circulation pipeline.

6. The purification device for acid-producing flue gas generated during the copper smelting flue gas acid production process according to claim 1, characterized in that, The waste acid storage tank output is connected to the waste acid removal process pipeline via a waste acid circulation pump.

7. The purification device for acid-producing flue gas generated during the copper smelting flue gas acid production 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 purification device for acid-producing flue gas generated during the copper smelting flue gas acid production process 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 dynamic wave.

9. A purification device for acid-producing flue gas generated during copper smelting flue gas production according to claim 1, characterized in that, A primary power wave extraction pump is installed on the connecting pipeline between the primary power wave and the inclined plate settling tank, and a low-flow filter press pump is installed on the connecting pipeline between the inclined plate settling tank and the plate and frame filter press.

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