CN210012608U - Evaporation tail gas absorbing device in sodium cyanide production - Google Patents
Evaporation tail gas absorbing device in sodium cyanide production Download PDFInfo
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- CN210012608U CN210012608U CN201920792481.2U CN201920792481U CN210012608U CN 210012608 U CN210012608 U CN 210012608U CN 201920792481 U CN201920792481 U CN 201920792481U CN 210012608 U CN210012608 U CN 210012608U
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- sodium cyanide
- evaporation
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- tail gas
- inlet
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Abstract
An evaporation tail gas absorption device in sodium cyanide production relates to the technical field of application chemical industry; the problems of pollution generated in the process of discharging evaporated gas in the process of producing sodium cyanide and influence on the yield of the sodium cyanide are solved; the device comprises an evaporation kettle, a drying tower, a spray tower and an alkali liquor tank, wherein a gas outlet is formed in the top of the evaporation kettle, a plurality of layers of filter screens and a sprayer above the filter screens are arranged in the gas outlet, and the sprayer is connected with a water inlet pipeline; the gas outlet is connected with the gas inlet of the drying tower through an exhaust pipeline, the top of the drying tower is connected with the gas inlet of a spray tower, a spray device at the top of the spray tower is connected with an alkali liquor tank through a liquid alkali pipeline, and a discharge hole of the spray tower is connected with a feed inlet of the evaporation kettle through a circulating liquid inlet pipe; the device can effectively remove hydrogen cyanide and a small amount of sodium cyanide which are mixed in the exhaust gas in the evaporation process, has mild process conditions, does not have high-temperature and high-pressure operation, is easy to realize and has good safety performance.
Description
Technical Field
The utility model relates to an use chemical industry technical field, concretely relates to evaporation tail gas absorbing device in sodium cyanide production.
Background
Sodium cyanide is mainly used in metal smelting, chemical synthesis, pesticides, medicine, electroplating industry and the like. The metallurgical industry is mainly used for extracting precious metals such as gold, silver, copper, zinc and the like; the pharmaceutical industry mainly uses as a part of pharmaceutical additives, such as caffeine, berberine, theobromine, aminophylline, pyrimethamine and the like; the chemical synthesis is mainly used for synthesizing cyanuric chloride, EDTA, cyanoacetic acid, methyl malonate, hydroxyl acetonitrile and the like; the electroplating industry is mainly used for complexing agents for copper plating, silver, cadmium, zinc and the like; the pesticide industry is mainly used for synthesizing pyrethroid pesticides. Other industries such as feed additives, chemical fibers, paper making, etc. also consume a portion.
The main production methods of sodium cyanide at present include an anderson method, a light oil cracking method and an acrylonitrile by-product method, wherein, hydrocyanic acid reacts with sodium hydroxide to obtain a sodium cyanide solution, and the sodium cyanide solution is evaporated, crystallized, subjected to solid-liquid separation, dried, formed and packaged into a product. Wherein, the evaporation concentration is a preparation step of crystallization and is also one of important links influencing the quality of the sodium cyanide product. However, the sodium cyanide is hydrolyzed to generate toxic gas hydrogen cyanide due to non-uniform temperature or over-high temperature in the evaporation process, and the toxic gas hydrogen cyanide is discharged along with steam, and meanwhile, the discharged gas is also mixed with sodium cyanide which is not crystallized, so that the yield of the sodium cyanide is reduced and the pollution problem is caused.
SUMMERY OF THE UTILITY MODEL
The utility model overcomes prior art's is not enough, provides an evaporation tail gas absorbing device in sodium cyanide production, solves the pollution that produces among the evaporation gas discharge process and influences the problem of sodium cyanide output in the sodium cyanide production process.
The utility model provides a technical scheme that its technical problem adopted is:
an evaporation tail gas absorption device in sodium cyanide production comprises an evaporation kettle, a drying tower, a spray tower and an alkali liquor tank, wherein a gas outlet is formed in the top of the evaporation kettle, a plurality of layers of filter screens and a sprayer above the filter screens are arranged in the gas outlet, and the sprayer is connected with a water inlet pipeline; the gas outlet pass through exhaust duct with the air inlet of drying tower be connected, the top of drying tower with the air inlet of spray column is connected, the spray set at the top of spray column is connected with the lye tank through the liquid caustic soda pipeline, the discharge gate of spray column with the feed inlet of reation kettle is connected through circulation feed liquor pipe, the filter screen be connected with the electrical heating temperature controller, the electrical heating temperature controller set up the outside of gas outlet.
In a further preferable structure, a cyanogen-containing tail gas inlet is formed in the bottom of the drying tower, and the exhaust pipeline is connected with the cyanogen-containing tail gas inlet.
In a further preferable structure, a liquid caustic soda delivery pump is arranged on the liquid caustic soda pipeline.
In a further preferred structure, the circulating liquid inlet pipe is provided with a liquid inlet pump.
In a further preferred structure, the filter screen is horizontally arranged.
The utility model discloses produced beneficial effect does for prior art.
1. The utility model discloses gas outlet at the evaporation kettle sets up the filter screen and can hold back the sodium cyanide that is mingled with in the exhaust gas, and the crystallization is on the filter screen when making it pass the filter screen, combines spray set simultaneously, washes the sodium cyanide of crystallization down, makes the continuous used repeatedly of filter screen ability, has clear away the partial sodium cyanide that is mingled with in the exhaust gas.
2. The utility model discloses the hydrogen cyanide mist that is mingled with in the follow evaporating pot combustion gas removes vapor earlier through the drying tower, prevents the polymerization of hydrogen cyanide, then lets in the spray column with dry hydrogen cyanide gas body, generates sodium cyanide solution, retrieves the hydrogen cyanide. The hydrogen cyanide content of the treated exhaust gas is reduced to less than 0.3 ppb.
3. The method has the advantages of mild process conditions, no high-temperature and high-pressure operation, safer operation, simple device, lower equipment investment cost, easy realization and good safety performance.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is an evaporation kettle, 2 is a drying tower, 3 is a spray tower, 4 is an alkali liquor tank, 5 is a gas outlet, 6 is a filter screen, 7 is a sprayer, 8 is a water inlet pipeline, 9 is an exhaust pipeline, 10 is a liquid alkali pipeline, 11 is a circulating liquid inlet pipe, 12 is a liquid alkali delivery pump, and 13 is a liquid inlet pump.
Detailed Description
In order to make the technical problem, technical scheme and beneficial effect that the utility model will solve more clearly understand, combine embodiment and attached drawing, it is right to go on further detailed description the utility model discloses. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solution of the present invention is described in detail below with reference to the embodiments and the drawings, but the scope of protection is not limited thereto.
As shown in fig. 1, is an evaporation tail gas absorbing device in sodium cyanide production, including an evaporation kettle 1, a drying tower 2, a spray tower 3 and an alkali liquor tank 4, the top of the evaporation kettle 1 is provided with a gas outlet 5, the gas outlet 5 in the horizontal spray 7 above four layers of filter screens 6 and the filter screens 6, the filter screens 6 are connected with an electric heating temperature controller, the electric heating temperature controller is arranged outside the gas outlet 5. The sprayer 7 is connected with a water inlet pipeline 8; the bottom of the drying tower 2 is provided with a cyanogen-containing tail gas inlet, and the gas outlet 5 is connected with the cyanogen-containing tail gas inlet of the drying tower 2 through an exhaust pipeline 9. The top of the drying tower 2 is connected with the air inlet of the spray tower 3, the spray device at the top of the spray tower 3 is connected with the lye tank 4 through a lye pipeline 10, and the discharge hole of the spray tower 3 is connected with the feed inlet of the evaporation kettle 1 through a circulating liquid inlet pipe 11. The liquid caustic soda pipeline 10 is provided with a liquid caustic soda delivery pump 12, and the circulating liquid inlet pipe 11 is provided with a liquid inlet pump 13.
The specific working process is as follows: when gas discharged from the evaporation kettle 1 passes through the gas outlet 5, sodium cyanide mixed in the gas is concentrated and crystallized and adhered to the heated filter screen 6 when passing through the filter screen 6, the part of sodium cyanide mixed in the gas is filtered, then the sodium cyanide crystallized on the filter screen 6 can be swept by the sprayer 7 arranged at the top of the gas and passes through the filter screen 6, the gas further enters the cyanogen-containing tail gas inlet at the bottom of the drying tower 2 through the exhaust pipeline 9, in the drying tower 2, the water cup in the gas absorbs the hydrogen cyanide in the gas to prevent the hydrogen cyanide from polymerizing in the gas, then the dry hydrogen cyanide gas is introduced into the spray tower 3, in the spray tower 3, the gas containing the hydrogen cyanide is sprayed by practical sodium hydroxide to generate sodium cyanide solution, and enters the evaporation kettle 1 again through the circulating liquid inlet pipe 11 to be evaporated, thereby eliminating the hydrogen cyanide mixed in the discharged gas, the hydrogen cyanide content of the treated exhaust gas is reduced to less than 0.3 ppb.
The above description is for further details of the present invention with reference to specific preferred embodiments, and it should not be understood that the embodiments of the present invention are limited thereto, and it will be apparent to those skilled in the art that the present invention can be implemented in a plurality of simple deductions or substitutions without departing from the scope of the present invention, and all such alterations and substitutions should be considered as belonging to the present invention, which is defined by the appended claims.
Claims (5)
1. An evaporation tail gas absorption device in sodium cyanide production is characterized by comprising an evaporation kettle, a drying tower, a spray tower and an alkali liquor tank, wherein a gas outlet is formed in the top of the evaporation kettle, a plurality of layers of filter screens and a sprayer above the filter screens are arranged in the gas outlet, and the sprayer is connected with a water inlet pipeline; the gas outlet pass through exhaust duct with the air inlet of drying tower be connected, the top of drying tower with the air inlet of spray column is connected, the spray set at the top of spray column is connected with the lye tank through the liquid caustic soda pipeline, the discharge gate of spray column with the feed inlet of reation kettle is connected through circulation feed liquor pipe, the filter screen be connected with the electrical heating temperature controller, the electrical heating temperature controller set up the outside of gas outlet.
2. The evaporation tail gas absorption device in sodium cyanide production according to claim 1, wherein a cyanogen-containing tail gas inlet is arranged at the bottom of the drying tower, and the exhaust pipeline is connected with the cyanogen-containing tail gas inlet.
3. The absorption device for evaporation tail gas in sodium cyanide production according to claim 1, wherein a caustic soda liquid delivery pump is arranged on the caustic soda liquid pipeline.
4. The absorption device for evaporation tail gas in sodium cyanide production according to claim 1, wherein the liquid inlet pipe of the circulation system is provided with a liquid inlet pump.
5. The absorption device for evaporation tail gas in sodium cyanide production according to claim 1, wherein the filter screen is horizontally arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920792481.2U CN210012608U (en) | 2019-05-29 | 2019-05-29 | Evaporation tail gas absorbing device in sodium cyanide production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920792481.2U CN210012608U (en) | 2019-05-29 | 2019-05-29 | Evaporation tail gas absorbing device in sodium cyanide production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210012608U true CN210012608U (en) | 2020-02-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920792481.2U Active CN210012608U (en) | 2019-05-29 | 2019-05-29 | Evaporation tail gas absorbing device in sodium cyanide production |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210012608U (en) |
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2019
- 2019-05-29 CN CN201920792481.2U patent/CN210012608U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A kind of evaporative tail gas absorption device in the production of sodium cyanide Effective date of registration: 20220802 Granted publication date: 20200204 Pledgee: Jincheng Financing Guarantee Co., Ltd. Pledgor: JINCHENG HONGSHENG CHEMICAL CO.,LTD. Registration number: Y2022140000041 |
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| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 048306 Pingcheng town Dongjie village, Lingchuan County, Jincheng City, Shanxi Province Patentee after: Shanxi Hongsheng Chemical Co.,Ltd. Address before: 048306 Pingcheng town Dongjie village, Lingchuan County, Jincheng City, Shanxi Province Patentee before: JINCHENG HONGSHENG CHEMICAL CO.,LTD. |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20230718 Granted publication date: 20200204 Pledgee: Jincheng Financing Guarantee Co.,Ltd. Pledgor: JINCHENG HONGSHENG CHEMICAL CO.,LTD. Registration number: Y2022140000041 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Evaporation tail gas absorption device in Sodium cyanide production Effective date of registration: 20230719 Granted publication date: 20200204 Pledgee: Jincheng Financing Guarantee Co.,Ltd. Pledgor: Shanxi Hongsheng Chemical Co.,Ltd. Registration number: Y2023140000041 |