CN215610423U - System for removing fluorine in pyrometallurgical flue gas - Google Patents
System for removing fluorine in pyrometallurgical flue gas Download PDFInfo
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- CN215610423U CN215610423U CN202121271254.9U CN202121271254U CN215610423U CN 215610423 U CN215610423 U CN 215610423U CN 202121271254 U CN202121271254 U CN 202121271254U CN 215610423 U CN215610423 U CN 215610423U
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- defluorination
- flue gas
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- fluorine
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Abstract
The utility model discloses a system for removing fluorine in pyrometallurgical flue gas, which comprises a flue gas fluorine removal tower, a waste water tank, a primary fluorine removal tank, a secondary fluorine removal tank, a deep fluorine removal tank, a thickener, a filter press and a post-fluorine removal liquid tank, and forms a two-section four-stage fluorine removal system; finally, fluorine in the liquid after fluorine removal meets the environmental protection standard, the corrosivity is greatly reduced, the liquid can be recycled as make-up water, the water resource is saved, the system is reliable in operation and high in automation degree, and the standard-reaching treatment of fluorine in the smelting process is realized.
Description
Technical Field
The utility model belongs to the technical field of chemical environmental protection, and particularly relates to a system for removing fluorine in pyrometallurgical flue gas.
Background
The ore contains a certain amount of fluorine, and enters smelting flue gas in the form of hydrogen fluoride in the pyrometallurgical process, so that a ceramic ring and a catalyst of a subsequent acid making system of the smelting flue gas are damaged, equipment and facilities made of metal materials are corroded and must be removed.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a system for removing fluorine in pyrometallurgical flue gas, which aims to solve the problems that the removal rate of the fluorine in the metallurgical flue gas is low and the fluorine in the wastewater does not reach the standard in the prior art.
In order to achieve the purpose, the utility model adopts the technical scheme that: a system for removing fluorine in pyrometallurgical flue gas comprises a flue gas defluorination tower, a waste water tank, a primary defluorination tank, a secondary defluorination tank, a deep defluorination tank, a thickener, a pressure filter and a post-defluorination liquid tank, wherein a spray head is arranged at the top of the flue gas defluorination tower, a sodium water glass feeding pipe is arranged at the lower part of the flue gas defluorination tower, a defluorination circulating pump is connected at the bottom of the flue gas defluorination tower, the outlet of the defluorination circulating pump is respectively connected with the spray head and the waste water tank in the flue gas defluorination tower, the outlet of the waste water tank is connected with the primary defluorination tank through a first pipeline, a waste water conveying pump is arranged on the first pipeline, the upper part of the primary defluorination tank is connected with the lower part of the secondary defluorination tank through a second pipeline, the upper part of the secondary defluorination tank is connected with the lower part of the deep defluorination tank through a third pipeline, the upper part of the deep defluorination tank is connected with a liquid inlet of the pressure filter through a fourth pipeline, the pressure filter is arranged on the thickener bottom through a fifth pipeline, the liquid outlet of the filter press is connected with the liquid tank after defluorination through a sixth pipeline; the lime milk adding pipe is arranged on the first pipeline, the defluorinating agent adding pipe is arranged on the second pipeline, and the PAC adding pipe and the PAM adding pipe are arranged on the third pipeline.
Furthermore, a fluorine-removing liquid pump is arranged at an outlet of the fluorine-removing liquid tank, one path of the fluorine-removing liquid pump is connected with the lower part of the flue gas fluorine removing tower through a recycling pipe, the other path of the fluorine-removing liquid pump is connected with a water replenishing port of the flue gas acid making system through a seventh pipeline, and a valve is arranged on the seventh pipeline.
Furthermore, the filter press is 2 in parallel arrangement, and a pressure gauge and a valve are installed on a liquid inlet pipe of the filter press.
Further, stirring devices are arranged in the primary defluorination groove, the secondary defluorination groove and the deep defluorination groove.
Further, the second pipeline and the third pipeline are obliquely arranged open inclined pipes.
Furthermore, the lower part of the flue gas fluorine removal tower is provided with a liquid level meter which is interlocked with an automatic valve arranged at one end of the recycling pipe close to the flue gas fluorine removal tower.
Furthermore, a water replenishing pipe is arranged at the lower part of the flue gas fluorine removal tower, and a valve is arranged on the water replenishing pipe.
Furthermore, automatic valves and flow meters are arranged on the sodium silicate feeding pipe, the PAC feeding pipe and the PAM feeding pipe, and the automatic valves are interlocked with the flow meters.
Further, still be equipped with the pH meter on the second pipeline, be equipped with check valve, automatic valve on the lime breast throwing pipe, and automatic valve and pH meter interlocking.
The utility model has the beneficial effects that: the process is simple, the operation is reliable, the automation degree is high, and the standard treatment of the fluorine in the smelting process is realized; two sections of four-stage defluorination processes are formed through a flue gas defluorination tower, a waste water tank, a primary defluorination tank, a secondary defluorination tank, a deep defluorination tank, a thickener, a filter press, a defluorination liquid tank, a sodium water glass feeding pipe, a lime milk feeding pipe, a defluorination agent feeding pipe, a PAC feeding pipe and a PAM feeding pipe; performing primary defluorination on smelting flue gas by using sodium silicate, transferring fluorine from a gas phase to a liquid phase, performing secondary defluorination on high-fluorine wastewater by using lime milk, a defluorinating agent, PAC (polyaluminium chloride) and PAM (polyacrylamide), forming a certain concentration gradient in a primary defluorinating tank, a secondary defluorinating tank and a deep defluorinating tank, improving the defluorinating efficiency, transferring fluorine from the liquid phase to a solid phase, and finally removing fluorine from a system by using a thickener and a filter press; the final defluorinated liquid has fluorine content meeting environment protecting standard, greatly reduced corrosion, capacity of being reused as supplementary water and saving in water resource.
Drawings
FIG. 1 is a schematic structural view of a system for removing fluorine from pyrometallurgical flue gas in accordance with the present invention.
In the figure: 1. a flue gas defluorination tower; 2. a defluorination circulating pump; 3. a waste water tank; 4. a wastewater delivery pump; 5. a primary defluorination tank; 6. a secondary defluorination tank; 7. a deep fluorine removal groove; 8. a thickener; 9. a liquid inlet pump of the filter press; 10. a filter press; 11. removing fluorine in the liquid tank; 12. after defluorination, a liquid pump is used; 13. a spray head; 14. a recycling pipe; 15. sodium water glass feeding pipe; 16. a lime milk feeding pipe; 17. a defluorinating agent feeding pipe; 18. a PAC dosing tube; 19. a PAM dosing tube; 20. a first conduit; 21. a second conduit; 22. a third pipeline; 23. a fourth conduit; 24. a fifth pipeline; 25. a sixth pipeline; 26. a seventh pipe; 27 water replenishing pipe.
Detailed Description
The present invention is described in further detail below with reference to the attached drawing figures.
As shown in figure 1, a system for removing fluorine in pyrometallurgical flue gas comprises a flue gas fluorine removal tower 1, a waste water tank 3, a primary fluorine removal tank 5, a secondary fluorine removal tank 6, a deep fluorine removal tank 7, a thickener 8, a filter press 10 and a post-fluorine removal liquid tank 11, wherein a spray head 13 is arranged at the top of the flue gas fluorine removal tower 1, a sodium water glass feeding pipe 15 is arranged at the lower part of the flue gas fluorine removal tower 1, a fluorine removal circulating pump 2 is connected to the bottom of the flue gas fluorine removal tower 1, an outlet of the fluorine removal circulating pump 2 is respectively connected with the spray head 13 and the waste water tank 3 in the flue gas fluorine removal tower 1, an outlet of the waste water tank 3 is connected with the primary fluorine removal tank 5 through a first pipeline 20, a waste water conveying pump 4 is arranged on the first pipeline 20, the upper part of the primary fluorine removal tank 5 is connected with the lower part of the secondary fluorine removal tank 6 through a second pipeline 21, the upper part of the secondary fluorine removal tank 6 is connected with the lower part of the deep fluorine removal tank 7 through a third pipeline 22, the upper part of the deep fluorine removal tank 7 is connected with a liquid inlet of the thickener 8 through a fourth pipeline 23, the bottom of the thickener 8 is connected with a liquid inlet pipe of the filter press 8 through a fifth pipeline 24, a liquid inlet pump of the filter press 9 is arranged on the fifth pipeline 24, and a liquid outlet of the filter press 10 is connected with the liquid tank 11 after defluorination through a sixth pipeline 25; a lime milk feeding pipe 16 is arranged on the first pipeline 20, a defluorinating agent feeding pipe 17 is arranged on the second pipeline 21, and a PAC feeding pipe 18 and a PAM feeding pipe 19 are arranged on the third pipeline 22.
According to an optional implementation mode, a fluorine removal liquid pump 12 is arranged at an outlet of the fluorine removal liquid tank 11, the fluorine removal liquid pump 12 is connected with the lower portion of the flue gas fluorine removal tower 1 through one path of a recycling pipe 14, the other path of the fluorine removal liquid pump is connected with a water replenishing port of a flue gas acid production system through a seventh pipeline 26, a valve is mounted on the seventh pipeline 26, part of fluorine removal liquid returns to a replenishing liquid level in the flue gas fluorine removal tower, and part of fluorine removal liquid enters the flue gas acid production system to serve as replenishing water.
In an optional implementation mode, the filter press 10 is 2 filters arranged in parallel, a pressure gauge and a valve are installed on a liquid inlet pipe of the filter press 10, the 2 filter presses alternately operate, the liquid inlet pressure of one filter press reaches 0.6MPa, and a liquid inlet valve is closed to stop feeding; and opening a liquid inlet valve of the other filter press to start feeding, so as to ensure that the filter pressing operation is uninterrupted.
An optional embodiment, all be equipped with agitating unit in one-level defluorination groove 5, second grade defluorination groove 6, the degree of depth defluorination groove 7, make reaction feed liquid misce bene, avoid the defluorination sediment deposit that generates.
An optional implementation mode, the second pipeline 21 and the third pipeline 22 are inclined open inclined pipes which are arranged obliquely, so that the flowing of material liquid is facilitated, the deposition is reduced, and the deposition material liquid is cleaned conveniently during maintenance of the open structure.
The lower part of the flue gas defluorination tower 1 is provided with a liquid level meter which is interlocked with an automatic valve arranged at one end of the recycling pipe 14 close to the flue gas defluorination tower 1, when the liquid level in the flue gas defluorination tower 1 is lowered, the automatic valve is opened, and liquid after defluorination is supplemented into the flue gas defluorination tower 1.
In an optional implementation mode, a water replenishing pipe 27 is installed at the lower part of the flue gas fluorine removal tower 1, a valve is arranged on the water replenishing pipe 27, and when the liquid level in the flue gas fluorine removal tower 1 drops, the valve is opened to replenish new water into the flue gas fluorine removal tower 1.
According to an optional implementation mode, automatic valves and flow meters are arranged on the sodium silicate feeding pipe 15, the PAC feeding pipe 18 and the PAM feeding pipe 19, the automatic valves are interlocked with the flow meters, and the feeding amounts of the sodium silicate, the PAC and the PAM are automatically adjusted through the automatic valves according to set flow values.
In an optional implementation mode, a pH meter is further arranged on the second pipeline 21, a check valve and an automatic valve are arranged on the lime milk adding pipe 16 and are interlocked with the pH meter, the adding of the lime milk is automatically controlled by the automatic valve through the set pH, and the check valve can prevent feed liquid in the primary defluorination tank 5 from entering the lime milk adding pipe 16 due to high potential difference self-pressure.
The flue gas defluorination tower 1, the primary defluorination groove 5, the secondary defluorination groove 6, the depth defluorination groove 7 and the thickener 8 are all cone bottom structures, short sections are arranged at the cone bottoms, manual valves are arranged on the short sections, and the inner feed liquid is emptied during the convenient maintenance.
The top of the flue gas defluorination tower 1 is provided with an air outlet, the lower part of the side of the flue gas defluorination tower is provided with an air inlet, and the air inlet is higher than a water replenishing port, a sodium water glass feeding port and a defluorination liquid recycling port, so that the liquid material is prevented from blocking the air inlet to form a liquid seal.
Gradient high potential difference exists among the primary defluorination tank 5, the secondary defluorination tank 6, the deep defluorination tank 7, the thickener 8 and the post-defluorination liquid tank 11, feed liquid is conveyed between adjacent equipment through the high potential difference, and a pump power facility is not arranged.
When the utility model is used, fresh water is injected into the flue gas defluorination tower 1 through the water supplementing pipe 27, sodium water glass solution with the concentration of 1 percent is supplemented, the defluorination circulating pump 2 is started, feed liquid in the tower is sent into the flue gas defluorination tower 1 spray head 13 to be sprayed from top to bottom, fluorine-containing smelting flue gas enters from the lower part of the flue gas defluorination tower 1 and is in countercurrent contact with the feed liquid, hydrogen fluoride in the flue gas is absorbed by the sodium water glass solution, and fluorine in the flue gas at the outlet of the top of the flue gas defluorination tower 1 is less than 1mg/Nm3Entering a flue gas acid making system; the fluorine content of the feed liquid in the flue gas fluorine removal tower 1 reaches 400mg/l, the feed liquid is shunted at the outlet of the fluorine removal circulating pump 2, simultaneously new water or liquid after fluorine removal is supplemented to maintain the liquid level, and the shunted feed liquid (namely fluorine-containing wastewater) is 5m3The wastewater enters a wastewater tank 3, is sent into a primary defluorination tank 5 through a wastewater delivery pump 4, is added with 1% of prepared lime emulsion in the primary defluorination tank 5, controls the pH value of the wastewater in a second pipeline to be 10-11, and contains 24.6mg/l of fluorine at a liquid outlet of the primary defluorination tank; the effluent of the first-stage defluorination tank enters a second-stage defluorination tank 6, a prepared defluorination agent with the concentration of 5 percent is added into the second-stage defluorination tank 6, and the effluent of the second-stage defluorination tank contains 18.4mg/l of fluorine; the effluent of the secondary defluorination tank enters a deep defluorination tank 7, and a prepared PAC solution with the concentration of 2 percent and the thickness of 0.2m is added into the deep defluorination tank 730.1 m/h and 0.5% strength PAM solution3After defluorination, the feed liquid enters a thickener 8 for solid-liquid separation, and the upper clear liquid contains 10.8mg/l of fluorine, which meets the indirect discharge standard; clear liquid at the upper part of the thickener 8 enters a fluorine-removing liquid tank 11, part of the clear liquid is sent to a smoke fluorine-removing tower 1 by a fluorine-removing liquid pump 12 to maintain the supplement liquid level for 2m, the rest clear liquid is sent to a smoke acid-making system to be used as supplement water for recycling, bottom flow liquid of the thickener 8 is sent to a filter press 10 by a filter press liquid inlet pump 9 to be pressed and filtered, and fluorine-removing slag is treated as common solid waste.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A system for removing fluorine in pyrometallurgical flue gas is characterized in that: comprises a flue gas defluorination tower, a waste water tank, a primary defluorination tank, a secondary defluorination tank, a deep defluorination tank, a thickener, a filter press and a defluorination back liquid tank, wherein a spray head is arranged at the top of the flue gas defluorination tower, a sodium water glass adding pipe is arranged at the lower part of the flue gas defluorination tower, a defluorination circulating pump is connected at the bottom of the flue gas defluorination tower, the outlet of the defluorination circulating pump is respectively connected with the spray head and the waste water tank in the flue gas defluorination tower, the outlet of the waste water tank is connected with the primary defluorination tank through a first pipeline, a waste water conveying pump is arranged on the first pipeline, the upper part of the primary defluorination tank is connected with the lower part of the secondary defluorination tank through a second pipeline, the upper part of the secondary defluorination tank is connected with the lower part of the deep defluorination tank through a third pipeline, the upper part of the deep defluorination tank is connected with a liquid inlet of the thickener through a fourth pipeline, the bottom of the thickener is connected with a liquid inlet pipe of the filter press through a fifth pipeline, and a liquid inlet pump is arranged on the fifth pipeline, the liquid outlet of the filter press is connected with the liquid tank after defluorination through a sixth pipeline; the lime milk adding pipe is arranged on the first pipeline, the defluorinating agent adding pipe is arranged on the second pipeline, and the PAC adding pipe and the PAM adding pipe are arranged on the third pipeline.
2. The system for removing fluorine in pyrometallurgical flue gas according to claim 1, characterized in that: and a defluorination rear liquid pump is arranged at an outlet of the defluorination rear liquid tank, one path of the defluorination rear liquid pump is connected with the lower part of the flue gas defluorination tower through a recycling pipe, the other path of the defluorination rear liquid pump is connected with a water replenishing port of a flue gas acid making system through a seventh pipeline, and a valve is arranged on the seventh pipeline.
3. The system for removing fluorine in pyrometallurgical flue gas according to claim 1, characterized in that: the filter press is 2 in parallel arrangement, and a pressure gauge and a valve are installed on a liquid inlet pipe of the filter press.
4. The system for removing fluorine in pyrometallurgical flue gas according to claim 1, characterized in that: and stirring devices are arranged in the primary defluorination groove, the secondary defluorination groove and the deep defluorination groove.
5. The system for removing fluorine in pyrometallurgical flue gas according to claim 1, characterized in that: the second pipeline and the third pipeline are obliquely arranged open inclined pipes.
6. The system for removing fluorine in pyrometallurgical flue gas according to claim 2, characterized in that: the lower part of the flue gas fluorine removal tower is provided with a liquid level meter which is interlocked with an automatic valve arranged at one end of the recycling pipe close to the flue gas fluorine removal tower.
7. The system for removing fluorine in pyrometallurgical flue gas according to claim 1, characterized in that: and a water replenishing pipe is arranged at the lower part of the flue gas fluorine removal tower, and a valve is arranged on the water replenishing pipe.
8. The system for removing fluorine in pyrometallurgical flue gas according to claim 1, characterized in that: and the sodium water glass feeding pipe, the PAC feeding pipe and the PAM feeding pipe are all provided with automatic valves and flow meters, and the automatic valves are interlocked with the flow meters.
9. The system for removing fluorine in pyrometallurgical flue gas according to claim 1, characterized in that: still be equipped with the pH meter on the second pipeline, be equipped with check valve, automatic valve on the lime breast is thrown the feeder tube, and automatic valve and pH meter interlocking.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121271254.9U CN215610423U (en) | 2021-06-08 | 2021-06-08 | System for removing fluorine in pyrometallurgical flue gas |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121271254.9U CN215610423U (en) | 2021-06-08 | 2021-06-08 | System for removing fluorine in pyrometallurgical flue gas |
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| CN215610423U true CN215610423U (en) | 2022-01-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113209781A (en) * | 2021-06-08 | 2021-08-06 | 金川集团股份有限公司 | System and method for removing fluorine in pyrometallurgical flue gas |
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- 2021-06-08 CN CN202121271254.9U patent/CN215610423U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113209781A (en) * | 2021-06-08 | 2021-08-06 | 金川集团股份有限公司 | System and method for removing fluorine in pyrometallurgical flue gas |
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