CN101157449A - Kiln-way phosphoric acid absorbing defluorination method - Google Patents
Kiln-way phosphoric acid absorbing defluorination method Download PDFInfo
- Publication number
- CN101157449A CN101157449A CNA2007100662435A CN200710066243A CN101157449A CN 101157449 A CN101157449 A CN 101157449A CN A2007100662435 A CNA2007100662435 A CN A2007100662435A CN 200710066243 A CN200710066243 A CN 200710066243A CN 101157449 A CN101157449 A CN 101157449A
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- China
- Prior art keywords
- phosphoric acid
- gas
- kiln
- defluorinating
- 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
- Y02P20/50—Improvements relating to the production of bulk chemicals
Abstract
The invention relates to a defluorinating method by kiln-process phosphoric acid absorption. The invention is characterized in that kiln gas of kiln-process phosphoric acid including phosphorus pentoxide and fluorine gas is led in a hydration absorption tower after being dedusted, and is sprayed into phosphoric acid from the top of the hydration absorption tower; the spraying quantity includes that the spraying quantity of phosphoric acid is 7 to 30m<3>/m<2>*h; tail gas is washed by a washing absorber and is exported after passing through a foam destroyer to reach the standard; partial scrub solution and foam removing liquid of the washing absorber are led in a phosphoric acid defluorinating groove; the scrub solution entering into the defluorinating groove is mixed with the phosphoric, and is defluorinated by cold air stripping, and then part of the scrub solution after being processed is exported to be used as finished phosphoric acid; gas produced when in stripping enters into a fluorine recovery system, and hydrofluosilicic acid is produced by water cycle absorption; heat phosphoric in the defluorinating groove acid enters into the hydration absorption tower to circularly absorb phosphorus pentoxide after heat transfer and cooling. The defluorinating method of the invention has the advantages that the absorbing effect is good, the defluorinating rate is high, the speed is high, the effect is good, the impurity in phosphoric acid and hydrofluosilicic acid produced is low, and the energy consumption is low.
Description
Technical field
The present invention relates to the method that the volatile gas delivery absorbs in a kind of flue gas and the liquid, the absorption defluorination method of fluoro-gas in particularly a kind of kiln-process phosphoric acid absorption and its flue gas.
Background technology
The Rock Phosphate (72Min BPL) of occurring in nature all contains a certain amount of fluorine, and Rock Phosphate (72Min BPL) is unique phosphor resource of making yellow phosphorus, phosphoric acid, phosphoric acid salt goods.Be that main raw material is made in the production process of yellow phosphorus, phosphoric acid, phosphoric acid salt goods with Rock Phosphate (72Min BPL), the part element fluorine can be overflowed with flue gas together with multiple compound form, the fluorine and the chemical compound gas thereof that exist with mineralized are all poisonous, animals and plants all there is huge harm, Gu must separate absorbent handle.
In kiln-process phosphoric acid production reduction process, the fluoro-gas compound of effusion and Vanadium Pentoxide in FLAKES gas also are stored in the flue gas; And a part absorbs at water and dilute phosphoric acid and enters in the phosphoric acid when Vanadium Pentoxide in FLAKES gas is produced phosphoric acid, and another part and phosphoric acid acid mist enter follow-up absorption system with tail gas.Enter the fluorochemical in the phosphoric acid, have a strong impact on the quality of phosphoric acid, the following process purposes of restriction phosphoric acid, the fluorine in the existing kiln-process phosphoric acid removes that technology defluorinate rate is not high, speed is slow, weak effect.
Summary of the invention
It is fast, effective to the purpose of this invention is to provide a kind of good absorbing effect, fluorine decreasing ratio height, speed, and impurity is low in the phosphoric acid that obtains, the silicofluoric acid, and the kiln-process phosphoric acid that energy consumption is little absorbs and fluorine removes technology.
The object of the present invention is achieved like this: the kiln gas that contains Vanadium Pentoxide in FLAKES and fluoro-gas compound that kiln-process phosphoric acid production reduction-oxidation obtains is introduced the hydration absorption tower after dedusting, spray into phosphoric acid (concentration 75～85%) by cat head, the phosphoric acid straying quatity is: 7～30m
3/ m
2H, absorb Vanadium Pentoxide in FLAKES gas and obtain phosphoric acid, phosphoric acid goes out the hydration absorption tower and enters defluorinate groove (temperature is at 80～90 ℃), the tail gas that goes out the fluorine-containing of hydration absorption tower and phosphoric acid acid mist after foam removal enters the washing tail gas resorber, tail gas is through spraying resorber, Venturi absorber or equipment for washing such as spray column resorber or tubulent contact tower resorber, qualified discharge after scum dredger is removed mist again; During washing continuously to the moisturizing of cycles of washing groove, contain a large amount of silicofluoric acid and a certain amount of phosphoric acid part washings (part is used for cycles of washing groove circulation cleaning tail gas) and foam removal liquid, introduce the defluorinate groove, absorb the moisture content that consumes in the Vanadium Pentoxide in FLAKES process in circulation to replenish phosphoric acid; The washings and the fluorine-containing high temperature phosphoric acid that enter a large amount of silicofluoric acid of containing of defluorinate groove mix, blast freezing air gas and propose defluorinate this moment in groove, the freezing air that blasts changes the liquid level partial pressure, fluorine-containing thing in the liquid is overflowed fast with air enter the fluorine recovery system, obtain silicofluoric acid, tail gas qualified discharge with the water cycle absorption; The freezing air that blasts cools off phosphoric acid in defluorinate and concentrates.Phosphoric acid after the defluorinate of defluorinate groove is partly drawn as finished product phosphoric acid, and part is gone into the circulation of hydration absorption tower and absorbed Vanadium Pentoxide in FLAKES through heat exchange cooling is laggard.
The present invention has following positively effect compared with the prior art: method good absorbing effect of the present invention, fluorine decreasing ratio height, speed are fast, effective, and impurity is low in the phosphoric acid that obtains, the silicofluoric acid, and energy consumption is little.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Embodiment
Embodiment 1:
As shown in Figure 1: the kiln gas of kiln-process phosphoric acid is introduced the hydration absorption tower behind high-temperature dust removal, spray into phosphoric acid (concentration 75～85%) by cat head, straying quatity is: the phosphoric acid straying quatity is: the phosphoric acid straying quatity is: 7～30m
3/ m
2H absorbs Vanadium Pentoxide in FLAKES gas and gets phosphoric acid; (high temperature) phosphoric acid goes out the hydration absorption tower and enters defluorinate groove (temperature is at 80～90 ℃), the tail gas that goes out the fluorine-containing of hydration absorption tower and phosphoric acid acid mist after the foam removal enters the washing tail gas resorber, tail gas is through spraying resorber, Venturi absorber or equipment for washing such as spray column resorber or tubulent contact tower resorber, qualified discharge after scum dredger is removed mist again; During washing continuously to cycles of washing groove (in washing resorber bottom) moisturizing, contain a large amount of silicofluoric acid and a certain amount of phosphoric acid part washings (another part is used for cycles of washing groove circulation cleaning tail gas) and foam removal liquid, introduce the defluorinate groove, absorb the moisture content that consumes in the Vanadium Pentoxide in FLAKES process in circulation to replenish phosphoric acid; The washings and the fluorine-containing high temperature phosphoric acid that enter a large amount of silicofluoric acid of containing of defluorinate groove mix, blast freezing air gas and propose defluorinate this moment in groove, fluorine-containing thing in the liquid is overflowed fast with air enter the fluorine recovery system, absorb with water cycle and obtain silicofluoric acid, tail gas qualified discharge; The freezing air that blasts cools off phosphoric acid in defluorinate and concentrates.Phosphoric acid after the defluorinate of defluorinate groove is partly drawn as finished product phosphoric acid, and part is gone into the circulation of hydration absorption tower and absorbed Vanadium Pentoxide in FLAKES through heat exchange cooling is laggard.
Claims (2)
1. the method for a kiln-way phosphoric acid absorbing defluorination, it is characterized in that: the kiln gas that will contain the kiln-process phosphoric acid of Vanadium Pentoxide in FLAKES and fluorine gas is introduced the hydration absorption tower after dedusting, spray into phosphoric acid by cat head, and straying quatity is: the phosphoric acid straying quatity is: 7～30m
3/ m
2H, tail gas enter washing resorber washing qualified discharge behind scum dredger again, and the part washings of washing resorber and foam removal liquid are introduced phosphoric acid defluorinate groove, and the washings and the phosphoric acid that enter the defluorinate groove mix, and carry the defluorinate rear section through freezing air gas and draw and become finished product phosphoric acid; The gas that gas is proposed generation enters the fluorine recovery system, absorbs with water cycle and makes silicofluoric acid; The hot phosphoric acid of defluorinate slot part enters water outlet and closes absorption tower circulation absorption Vanadium Pentoxide in FLAKES after the heat exchange cooling.
2. the method for kiln-way phosphoric acid absorbing defluorination according to claim 1, it is characterized in that: hydration tail gas from absorption tower outlet section is provided with Despumation device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100662435A CN101157449A (en) | 2007-09-26 | 2007-09-26 | Kiln-way phosphoric acid absorbing defluorination method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100662435A CN101157449A (en) | 2007-09-26 | 2007-09-26 | Kiln-way phosphoric acid absorbing defluorination method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101157449A true CN101157449A (en) | 2008-04-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100662435A Pending CN101157449A (en) | 2007-09-26 | 2007-09-26 | Kiln-way phosphoric acid absorbing defluorination method |
Country Status (1)
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| CN (1) | CN101157449A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101972584A (en) * | 2010-11-01 | 2011-02-16 | 山东聊城鲁西化工第四化肥有限公司 | Device and process for washing phosphoric acid tail gas and cogenerating sodium fluosilicate |
| CN104176719A (en) * | 2013-05-27 | 2014-12-03 | 中石化南京工程有限公司 | Tower type air stripping defluorination method for phosphoric acid |
| WO2014194564A1 (en) * | 2013-06-04 | 2014-12-11 | 四川玖长科技有限公司 | Device and process for fluorine recovery from smoke after phosphorus absorption by hydration in kiln process for production of phosphoric acid |
| CN107140613A (en) * | 2017-06-27 | 2017-09-08 | 贵州东晟捷能科技有限公司 | A kind of method and its device for preparing thermal phosphoric acid and reclaiming heat energy |
-
2007
- 2007-09-26 CN CNA2007100662435A patent/CN101157449A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101972584A (en) * | 2010-11-01 | 2011-02-16 | 山东聊城鲁西化工第四化肥有限公司 | Device and process for washing phosphoric acid tail gas and cogenerating sodium fluosilicate |
| CN104176719A (en) * | 2013-05-27 | 2014-12-03 | 中石化南京工程有限公司 | Tower type air stripping defluorination method for phosphoric acid |
| WO2014194564A1 (en) * | 2013-06-04 | 2014-12-11 | 四川玖长科技有限公司 | Device and process for fluorine recovery from smoke after phosphorus absorption by hydration in kiln process for production of phosphoric acid |
| RU2638982C2 (en) * | 2013-06-04 | 2017-12-19 | Сычуань Ко Чанг Технолоджи Ко., Лтд | Device and process used for restoring fluorine from smoke after phosphorus absorption by hydration in burning process in furnace for producing phosphoric acid |
| US10232312B2 (en) | 2013-06-04 | 2019-03-19 | Sichuan Ko Chang Technology Co., Ltd | Device and process for fluorine recovery from smoke after phosphorus absorption by hydration in kiln process for production of phosphoric acid |
| CN107140613A (en) * | 2017-06-27 | 2017-09-08 | 贵州东晟捷能科技有限公司 | A kind of method and its device for preparing thermal phosphoric acid and reclaiming heat energy |
| CN107140613B (en) * | 2017-06-27 | 2023-09-12 | 贵州东晟捷能科技有限公司 | Method and device for preparing phosphoric acid by thermal method and recovering heat energy |
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Open date: 20080409 |