CN110508116B - Waste circuit board smelting flue gas purification recovery system - Google Patents
Waste circuit board smelting flue gas purification recovery system Download PDFInfo
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- CN110508116B CN110508116B CN201910886589.2A CN201910886589A CN110508116B CN 110508116 B CN110508116 B CN 110508116B CN 201910886589 A CN201910886589 A CN 201910886589A CN 110508116 B CN110508116 B CN 110508116B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/68—Halogens or halogen compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/10—Bromides
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
- C01D5/04—Preparation of sulfates with the aid of sulfurous acid or sulfites, e.g. Hargreaves process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/606—Carbonates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/20—Halogens or halogen compounds
- B01D2257/202—Single element halogens
- B01D2257/2022—Bromine
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/20—Halogens or halogen compounds
- B01D2257/204—Inorganic halogen compounds
- B01D2257/2045—Hydrochloric acid
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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Abstract
The invention relates to the technical field of waste gas purification and recovery, in particular to a waste circuit board smelting flue gas purification and recovery system which comprises a purification device and a recovery device, wherein the recovery device comprises a liquid storage tank, a spray tower and an absorption tower, the purification device, the spray tower and the absorption tower are sequentially communicated so that smelting flue gas flows from the spray tower to the absorption tower, the liquid storage tank, the absorption tower and the spray tower are sequentially communicated, and the liquid storage tank is used for supplying mixed solution of sodium sulfite and sodium carbonate to the absorption tower so that the flow direction of the mixed solution in the absorption tower and the spray tower is opposite to the flow direction of the smelting flue gas. After being discharged by the purification device, the smelting flue gas firstly enters the spray tower and then enters the absorption tower, so that mixed solution and the smelting flue gas are formed, the mixed solution and the smelting flue gas are in opposite flow directions, the effect that the acid gas and bromine are absorbed more completely is achieved, the bromine can be effectively recovered, secondary pollution generated in the process of purifying and recovering the smelting flue gas can be prevented, and the flue gas treatment is efficient, energy-saving, environment-friendly and pollution-free.
Description
Technical Field
The invention relates to the technical field of waste gas purification and recovery, in particular to a waste circuit board smelting flue gas purification and recovery system.
Background
At present, the printed circuit board is the basis of the electronic industry, the waste circuit board is treated by a pyrometallurgy method without picking raw materials, the process is simple and direct, but smelting smoke containing harmful gases such as Br 2、HCl、SO2、NO2 and the like can be generated, and the treatment difficulty is high. Bromine is a resource, bromine simple substance does not exist in the nature, the concentration of bromine in the seawater is very low, the content of bromine salt in the seawater is about 65ppm, and the seawater is the main method for obtaining bromine at present. It is very valuable to recover bromine from the spent circuit board smelting flue gas. The existing method or device for purifying the flue gas of the incineration electricity/circuit board can enable the tail gas to reach the standard, but does not have the process of recovering bromine element, does not describe the treatment method of waste alkali liquor and waste activated carbon, and is easy to cause secondary pollution.
Disclosure of Invention
The invention aims to solve the technical problem that bromine recovery can not be performed on the existing waste circuit board smelting flue gas.
In order to solve the technical problems, the invention provides a waste circuit board smelting flue gas purifying and recycling system, which comprises a purifying device and a recycling device, wherein the recycling device comprises a liquid storage tank, a spray tower and an absorption tower, the purifying device, the spray tower and the absorption tower are sequentially communicated, so that smelting flue gas flows from the spray tower to the absorption tower, the liquid storage tank, the absorption tower and the spray tower are sequentially communicated, and the liquid storage tank is used for supplying a mixed solution of sodium sulfite and sodium carbonate to the absorption tower, so that the flow direction of the mixed solution in the absorption tower and the spray tower is opposite to the flow direction of the smelting flue gas.
The recovery device further comprises a sedimentation tank and a crystallization separation device, and the spray tower, the sedimentation tank and the crystallization separation device are sequentially connected.
The crystallization separation device comprises a first crystallization tank and a first separator which are sequentially connected, and the first crystallization tank is communicated with the sedimentation tank.
The crystallization separation device further comprises a second crystallization tank and a second separator, and the first separator, the second crystallization tank and the second separator are sequentially connected.
The spray tower and the absorption tower are provided with a single-tower circulating structure, the single-tower circulating structure comprises a pipeline and a pump body, the pipeline is used for communicating a liquid outlet and a liquid inlet of the tower body, and the pump body is arranged on the pipeline.
The plurality of absorption towers are sequentially connected in series and communicated with the spray towers.
The purification device comprises a combustion chamber, a waste heat boiler, a quenching tower, a dust collector and a fan which are sequentially communicated, wherein the fan is connected with the spray tower.
The waste circuit board smelting flue gas purification and recovery system further comprises a discharge device, wherein the discharge device comprises electric defogging, and the electric defogging is communicated with the absorption tower.
The technical scheme of the invention has the following advantages:
The waste circuit board smelting flue gas purifying and recycling system provided by the embodiment of the invention primarily purifies smelting flue gas generated after smelting the waste circuit board through the purifying device, then the smelting flue gas enters the spray tower, the spray tower cools the smelting flue gas, the cooled smelting flue gas enters the absorption tower, and the absorption tower removes acid gas SO 2、HCl、NOx and bromine in the smelting flue gas. According to the invention, the mixed solution of sodium sulfite and sodium carbonate is used as an absorption liquid to treat the smelting flue gas of the waste circuit board, the liquid storage tank is used for supplying the mixed solution of sodium sulfite and sodium carbonate, the mixed solution firstly enters the absorption tower, then enters the spray tower from the absorption tower, the mixed solution in the spray tower is used for primarily absorbing acid gas and bromine in the smelting flue gas while cooling the smelting flue gas, and then fully contacts the acid gas and bromine in the smelting flue gas when entering the absorption tower, SO that bromine element and acid gas are fully absorbed, and the acid gas SO 2、HCl、NOx in the smelting flue gas is discharged up to the standard, and meanwhile, bromine element is recovered.
The liquid storage tank provides a mixed solution stock solution of sodium sulfite and sodium carbonate for the absorption tower, and a mixed solution stock solution of sodium sulfite and sodium carbonate for the spray tower. After being discharged by the purification device, the smelting flue gas firstly enters the spray tower and then enters the absorption tower, so that mixed solution and the smelting flue gas are formed, the mixed solution and the smelting flue gas are in opposite flow directions, the effect that the acid gas and bromine are absorbed more completely is achieved, the bromine can be effectively recovered, secondary pollution generated in the process of purifying and recovering the smelting flue gas can be prevented, and the flue gas treatment is efficient, energy-saving, environment-friendly and pollution-free.
In addition to the technical problems, features of the constituent technical solutions and advantages brought by the technical features of the technical solutions described above, other technical features of the present invention and advantages brought by the technical features of the technical solutions, further description will be made with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic structural diagram of a waste circuit board smelting flue gas purifying and recovering system according to an embodiment of the invention.
In the figure: 1: a purifying device; 2: a recovery device; 3: a discharge device; 11: a combustion chamber; 12; a waste heat boiler; 13: a quench tower; 14: a dust collector; 15: a blower; 21: a liquid storage tank; 22: a spray tower; 23: an absorption tower; 24: a sedimentation tank; 25: a crystallization separation device; 31: electric defogging; 231: a first absorption tower; 232: a second absorption tower; 251: a first crystallization tank; 252: a first separator; 253: a second crystallization tank; 254: and a second separator.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Furthermore, in the description of the present invention, unless otherwise indicated, the meaning of "a plurality", "a plurality of groups" means two or more, and the meaning of "a plurality", "a plurality of roots", "a plurality of groups" means one or more.
As shown in fig. 1, the waste circuit board smelting flue gas purifying and recovering system provided by the embodiment of the invention comprises a purifying device 1 and a recovering device 2, wherein the recovering device 2 comprises a liquid storage tank 21, a spray tower 22 and an absorption tower 23, the purifying device 1, the spray tower 22 and the absorption tower 23 are sequentially communicated so that smelting flue gas flows from the spray tower 22 to the absorption tower 23, the liquid storage tank 21, the absorption tower 23 and the spray tower 22 are sequentially communicated, and the liquid storage tank 21 is used for supplying a mixed solution of sodium sulfite and sodium carbonate to the absorption tower 23 so that the flow direction of the mixed solution in the absorption tower 23 and the spray tower 22 is opposite to the flow direction of the smelting flue gas.
The waste circuit board smelting flue gas purifying and recycling system provided by the embodiment of the invention primarily purifies the smelting flue gas generated after the smelting of the waste circuit board through the purifying device 1, then the smelting flue gas enters the spray tower 22, the spray tower 22 cools the smelting flue gas, the cooled smelting flue gas enters the absorption tower 23, and the absorption tower 23 removes acid gas SO 2、HCl、NOx and bromine in the smelting flue gas. According to the invention, the mixed solution of sodium sulfite and sodium carbonate is used as an absorption solution to treat the waste circuit board smelting flue gas, the liquid storage tank 21 is used for supplying the mixed solution of sodium sulfite and sodium carbonate, the mixed solution firstly enters the absorption tower 23, then enters the spray tower 22 from the absorption tower 23, the mixed solution in the spray tower 22 is used for primarily absorbing acid gas and bromine in the smelting flue gas while cooling the smelting flue gas, and then fully contacting the acid gas and bromine in the smelting flue gas when entering the absorption tower 23, SO that bromine element and acid gas are fully absorbed, and the acid gas SO 2、HCl、NOx in the smelting flue gas is discharged after reaching standards, and meanwhile, bromine element is recovered.
The liquid storage tank 21 provides a mixed solution stock solution of sodium sulfite and sodium carbonate for the absorption tower 23, and a mixed solution stock solution of sodium sulfite and sodium carbonate for the absorption tower 23 provides a mixed solution stock solution of sodium sulfite and sodium carbonate for the spray tower 22. After being discharged by the purification device 1, the smelting flue gas firstly enters the spray tower 22 and then enters the absorption tower 23, so that a mixed solution is formed and the flow direction of the smelting flue gas is opposite, the mixed solution and the smelting flue gas are in full contact, the effect that the acid gas and bromine are absorbed more completely is achieved, the bromine can be effectively recovered, secondary pollution generated in the process of purifying and recovering the smelting flue gas can be prevented, and the flue gas treatment is ensured to be efficient and energy-saving, and environment-friendly and pollution-free.
The gas temperature of the smelting flue gas passing through the purification device 1 is about 150 ℃, and the gas component is mainly N 2、O2、CO2、H2O、Br2、HCl、SO2、NOx, so that the mixed solution of sodium sulfite and sodium carbonate is selected to absorb Br 2、SO2、HCl、NOx, and the acid gas SO2、HCl、NOx in the finally discharged tail gas is discharged up to the standard. The reaction principle is as follows:
Principle 1: SO (SO) 3 2-+Br2+H2O==SO4 2-+2Br-+2H+
Principle 2: SO (SO) 2+Br2+2H2O==SO4 2-+2Br-+4H+
Principle 3: hcl= Cl -+H+
Principle 4:3NO 2+H2O==2NO3-+NO+2H+
Principle 5: CO 3 2-+2H+==CO2+H2 O
Principle 1, absorbing bromine with sodium sulfite while producing H +; principle 2 oxidation-reduction reaction can absorb Br 2 、SO2 and produce H + simultaneously; principle 3 and principle 4 are that H + is released after acid gas is absorbed by water; principle 5 is that carbonate as a base reacts with H + in a neutralization reaction.
Wherein, recovery unit 2 still includes sedimentation tank 24 and crystallization separator 25, and spray column 22, sedimentation tank 24 and crystallization separator 25 connect gradually. The mixed solution of sodium sulfite and sodium carbonate sequentially enters an absorption tower 23 and a spray tower 22 from a liquid storage tank 21, fully contacts and reacts with smelting flue gas, and finally is discharged into a sedimentation tank 24 from a lower outlet of the spray tower 22, wherein the sedimentation tank 24 is a bromine salt tank in the embodiment. The mixed solution in the spray tower 22 is fully contacted with the smelting flue gas reversely, partial moisture of the mixed solution is evaporated, the salt concentration of the liquid is improved, and the rest mixed solution flows into a bromine salt pond through a pipeline. The mixed solution is precipitated and filtered in a bromine salt pond, and then enters a crystallization separation device 25, and sodium sulfate and sodium bromide (containing a small amount of sodium sulfate, sodium chloride and sodium nitrate) are obtained by crystallizing and separating components in the mixed solution, SO that acid gas SO 2、HCl、NOx in smelting flue gas is removed and bromine element is recovered.
Wherein the crystallization separation device 25 comprises a first crystallization tank 251 and a first separator 252 which are sequentially connected, and the first crystallization tank 251 is communicated with the sedimentation tank 24. In this embodiment, the crystallization separation device 25 adopts a crystallization tank and a separator, the mixed solution after precipitation and filtration enters the crystallization tank, and is evaporated and cooled for crystallization, and then the crystals and the solution in the crystallization tank are centrifugally separated by the separator, so that sodium sulfate and sodium bromide (containing a small amount of sodium sulfate, sodium chloride and sodium nitrate) are finally obtained.
The crystallization separation device 25 further includes a second crystallization tank 253 and a second separator 254, and the first separator 252, the second crystallization tank 253 and the second separator 254 are sequentially connected. In the embodiment, the crystallization separator 25 performs the secondary crystallization separation, and the secondary crystallization separation is performed by adding the configuration of the second crystallization tank 253 and the second separator 254 to the primary crystallization separation in which the first crystallization tank 251 and the first separator 252 cooperate. The mixed solution after precipitation and filtration in the bromine salt pond enters a first crystallization tank 251, is evaporated and cooled for crystallization, then the crystals and the solution in the first crystallization tank 251 are centrifugally separated by a first separator 252 to obtain sodium sulfate (containing a small amount of sodium bromide, sodium chloride and sodium nitrate), the mixed solution separated by the first separator 252 enters a second crystallization tank 253, is further evaporated and cooled for crystallization, and then the crystals and the solution in the second crystallization tank 253 are centrifugally separated by a second separator 254 to finally obtain sodium bromide (containing a small amount of sodium sulfate, sodium chloride and sodium nitrate). The solubility of different chemical components is different, so that the concentration of the mixed solution is changed through secondary crystallization separation, and the bromine element is separated out to the greatest extent and separated and recovered from the mixed solution.
Wherein, all be equipped with single tower circulation structure on spray column 22 and the absorption tower 23, single tower circulation structure includes pipeline and the pump body, and the pipeline is used for communicating the liquid outlet and the inlet of tower body, and the pump body sets up on the pipeline. In this embodiment, the liquid outlet of tower body bottom and the inlet intercommunication at tower body top can be with the pipeline of single tower circulation structure, in this embodiment, the pump body can adopt the circulating pump, there is the liquid storage in absorption tower 23 and spray column 22's bottom, the liquid storage gets into the pump body through the pipeline from tower body bottom under the effect of circulating pump on the pipeline, and spray into the tower body inside through the shower nozzle of inlet, fall back to the tower body bottom again after reverse abundant contact with the smelting flue gas, thereby realize the single tower circulation of mixed solution, mixed solution can fully play a role in the circulation process and smelt flue gas contact reaction, effectively practice thrift the quantity of mixed solution.
Wherein, a plurality of absorption towers 23 are provided, and a plurality of absorption towers 23 are connected in series in turn and are communicated with the spray tower 22. The number of the absorption towers 23 can be set according to actual needs, and the smelting flue gas can reach the purification emission standard. In this embodiment, two absorption towers 23 are provided, the mixed solution of sodium sulfite and sodium carbonate sequentially enters the second absorption tower 232, the first absorption tower 231 and the spray tower 22 from the liquid storage tank, the smelting flue gas also sequentially enters the spray tower 22, the first absorption tower 231 and the second absorption tower 232, the liquid storage tank 21 provides the mixed solution for the second absorption tower 232, the liquid storage of the second absorption tower 232 provides the stock solution for the first absorption tower 231, and the liquid storage of the first absorption tower 231 provides the stock solution for the spray tower 22.
The purification device 1 comprises a combustion chamber 11, a waste heat boiler 12, a quenching tower 13, a dust collector 14 and a fan 15 which are sequentially communicated, wherein the fan 15 is connected with a spray tower 22. In the embodiment, the purification device primarily purifies smelting smoke, and the waste circuit board smelting smoke sequentially passes through the combustion chamber 11, the waste heat boiler 12, the quenching tower 13, the dust collector 14 and the fan 15, wherein the combustion chamber 11 is a secondary combustion chamber, and the secondary combustion chamber enables the smelting smoke to be fully combusted, so that generation of dioxin substances is reduced; the waste heat boiler 12 is used for recovering heat of smelting flue gas; the quenching tower 13 is used for quickly cooling the smelting flue gas and reducing the reverse synthesis yield of dioxin substances; the dust collector 14 adopts a cloth bag dust collector which is used for removing smoke dust in smelting smoke; the fan 15 provides smelting smoke flow power; after the smelting flue gas discharged from the fan 15 enters the spray tower 22, the absorption tower 23 and other devices of the recovery device 2, the smelting flue gas is discharged from a chimney with a height of 50 meters to reach the standard.
Wherein, waste circuit board smelting flue gas purification recovery system still includes discharging device 3, and discharging device 3 includes electric defogging 31, and electric defogging 31 communicates with absorption tower 23. The smelting flue gas is purified by a purification device 1 and a recovery device 2, and after bromine element is recovered, the smelting flue gas is discharged by a discharge device 3. The discharging device 3 of the embodiment comprises an electric demister 31 for removing water mist in the purified gas, and the discharging height of the tail gas is not less than 50 meters according to the discharging requirement, so that the tail gas discharged by the electric demister 31 device reaches the standard and is discharged from a chimney with a height of 50 meters.
In summary, the waste circuit board smelting flue gas purifying and recycling system provided by the embodiment of the invention primarily purifies the smelting flue gas generated after the smelting of the waste circuit board through the purifying device, then the smelting flue gas enters the spray tower, the spray tower cools the smelting flue gas, the cooled smelting flue gas enters the absorption tower, and the absorption tower removes acid gas SO 2、HCl、NOx and bromine in the smelting flue gas. According to the invention, the mixed solution of sodium sulfite and sodium carbonate is used as an absorption liquid to treat the smelting flue gas of the waste circuit board, the liquid storage tank is used for supplying the mixed solution of sodium sulfite and sodium carbonate, the mixed solution firstly enters the absorption tower, then enters the spray tower from the absorption tower, the mixed solution in the spray tower is used for primarily absorbing acid gas and bromine in the smelting flue gas while cooling the smelting flue gas, and then fully contacts the acid gas and bromine in the smelting flue gas when entering the absorption tower, SO that bromine element and acid gas are fully absorbed, and the acid gas SO 2、HCl、NOx in the smelting flue gas is discharged up to the standard, and meanwhile, bromine element is recovered.
The liquid storage tank provides a mixed solution stock solution of sodium sulfite and sodium carbonate for the absorption tower, and a mixed solution stock solution of sodium sulfite and sodium carbonate for the spray tower. After being discharged by the purification device, the smelting flue gas firstly enters the spray tower and then enters the absorption tower, so that mixed solution and the smelting flue gas are formed, the mixed solution and the smelting flue gas are in opposite flow directions, the effect that the acid gas and bromine are absorbed more completely is achieved, the bromine can be effectively recovered, secondary pollution generated in the process of purifying and recovering the smelting flue gas can be prevented, and the flue gas treatment is efficient, energy-saving, environment-friendly and pollution-free.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. The utility model provides a waste circuit board smelts flue gas purification recovery system which characterized in that: the device comprises a purification device and a recovery device, wherein the recovery device comprises a liquid storage tank, a spray tower and an absorption tower, the purification device, the spray tower and the absorption tower are sequentially communicated, so that smelting flue gas flows from the spray tower to the absorption tower, the liquid storage tank, the absorption tower and the spray tower are sequentially communicated, and the liquid storage tank is used for supplying a mixed solution of sodium sulfite and sodium carbonate to the absorption tower, so that the flow direction of the mixed solution in the absorption tower and the spray tower is opposite to the flow direction of the smelting flue gas; the recovery device further comprises a sedimentation tank and a crystallization separation device, and the spray tower, the sedimentation tank and the crystallization separation device are sequentially connected; the crystallization separation device comprises a first crystallization tank and a first separator which are sequentially connected, wherein the first crystallization tank is communicated with the sedimentation tank, and crystals and solution in the first crystallization tank are centrifugally separated by the first separator to obtain sodium sulfate; the crystallization separation device further comprises a second crystallization tank and a second separator, wherein the first separator, the second crystallization tank and the second separator are sequentially connected, and crystals and solution in the second crystallization tank are centrifugally separated through the second separator, so that sodium bromide is finally obtained; the two absorption towers are used, the mixed solution of sodium sulfite and sodium carbonate sequentially enters the second absorption tower, the first absorption tower and the spray tower from the liquid storage tank, smelting smoke sequentially enters the spray tower, the first absorption tower and the second absorption tower, the liquid storage tank is used for providing the mixed solution for the second absorption tower, the liquid storage of the second absorption tower is used for providing the stock solution for the first absorption tower, and the liquid storage of the first absorption tower is used for providing the stock solution for the spray tower.
2. The scrap circuit board smelting flue gas cleaning recovery system in accordance with claim 1, wherein: the utility model discloses a tower, including the absorption tower, the absorption tower is equipped with the absorption tower, the absorption tower is last all to be equipped with single tower circulation structure, single tower circulation structure includes pipeline and the pump body, the pipeline is used for the liquid outlet and the inlet intercommunication of tower body, the pump body set up in on the pipeline.
3. The scrap circuit board smelting flue gas cleaning recovery system in accordance with claim 1, wherein: the purification device comprises a combustion chamber, a waste heat boiler, a quenching tower, a dust collector and a fan which are sequentially communicated, and the fan is connected with the spray tower.
4. The scrap circuit board smelting flue gas cleaning recovery system in accordance with claim 1, wherein: the waste circuit board smelting flue gas purification recovery system further comprises a discharge device, wherein the discharge device comprises electric defogging, and the electric defogging is communicated with the absorption tower.
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| CN201910886589.2A CN110508116B (en) | 2019-09-19 | 2019-09-19 | Waste circuit board smelting flue gas purification recovery system |
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