CN101428191A - Method for improving washing efficiency for tail gas from wet-process phosphoric acid manufacture - Google Patents
Method for improving washing efficiency for tail gas from wet-process phosphoric acid manufacture Download PDFInfo
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- CN101428191A CN101428191A CN 200810068988 CN200810068988A CN101428191A CN 101428191 A CN101428191 A CN 101428191A CN 200810068988 CN200810068988 CN 200810068988 CN 200810068988 A CN200810068988 A CN 200810068988A CN 101428191 A CN101428191 A CN 101428191A
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- phosphoric acid
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Abstract
The invention discloses a method for improving the washing efficiency of tail gas during wet process phosphoric acid production, and relates to tail gas treatment in wet process phosphoric acid production. The method comprises the following steps: firstly, sealing a reaction tank, that is, completely insulating the inside of a reaction digesting chamber from the outside thereof by adding oil seal onto stirring equipment of the reaction tank and sealing a service port cover board; secondly, washing tail gas through first class Venturi and third class hollow-spraying-tower in a counter current washing manner, the Venturi and a first washing tower require a small quantity of water to accomplish washing, and cleaning solution is reserved for a phosphoric acid concentration fluorine absorption system, while for second class and third class washing, a large quantity of water is required, cleaning solution is sent back to a phosphoric acid reaction system and consumed to guarantee the washing efficiency. When the method is applied in the negative pressure operation of the reaction digesting chamber, air outside the chamber cannot enter the reaction digesting chamber through the gap between the equipment and the reaction chamber, so that the volume of tail gas is greatly reduced, the concentration of fluoride in tail gas is increased, and the washing efficiency is improved. As washing is more frequently carried out, the concentration of the cleaning solution is increased, so that the recycling of the cleaning solution can be facilitated.
Description
Technical field
The present invention is relevant with phosphoric acid, and is particularly, relevant, special relevant with the processing method of process tail gas with the technology that adopts dihydrate process production phosphoric acid by wet process.
Technical background
The tail gas that produces in the Wet-process Phosphoric Acid Production mainly is the waste gas containing fluoride that is produced after acidolysis by the fluorine in the phosphorus ore, mainly comes the autoreaction digestive shelf.Because the reaction digestive shelf is a micro-negative pressure operation, a large amount of air is entered in the groove by the equipment room gap, and exhausted air quantity is heightened, and fluoride concentration reduces in the waste gas, has increased the load of washing system.After the fluorinated tail gas of overflowing is introduced into Venturi scrubber and washes with water, discharge after entering the two-stage tail gas washing tower again or entering the countercurrent washing of whirlwind scrubbing tower combination water, washings send sewage plant to handle.
Still do not have at present and relate to the relevant patent of the fluorinated tail gas detersive efficiency that produces in the Wet-process Phosphoric Acid Production.The patent that relates to phosphoric acid production, in for example No. 01138286.4 " a kind of process for preparing wet phosphoric acid by dihydrate method ", No. 200510010641.6 " a kind of method of improving dihydrate wet-process phosphoric acid production ", the tail gas of reaction also adopts conventional method to wash.Though these inventions have some effects, and the not high problem of unresolved washing tail gas efficient, fluorine content does not reach national specified discharge standard substantially in the tail gas.
Summary of the invention
Purpose of the present invention just is to provide the method that improves washing efficiency for tail gas from wet-process phosphoric acid manufacture, to overcome the defective of prior art, reduces the exhaust emissions amount, improves the detersive efficiency of tail gas.
The inventor in the Wet-process Phosphoric Acid Production to the applicable cases of vent gas treatment in actual production; according to the policy of country to environmental protection; by a series of improvement is carried out in the source of tail gas generation and technology, equipment and the control of processing procedure; further improve the quality that phosphoric acid tail gas is handled; reduce environmental pollution, increase economic efficiency.
The method of the raising washing efficiency for tail gas from wet-process phosphoric acid manufacture that the inventor provided comprises two technical measures:
The one, reactive tank is sealed, by on the mixing plant of reactive tank, setting up oil sealing, the access hole cover plate being sealed, make reaction isolated fully inside and outside the digestive shelf.The 2nd, adopt one-level Venturi scrubbing and three grades of hollow-spraying-tower washing tail gas.
In above-mentioned second measure, described mode of washing is countercurrent washing, and the venturi and first scrubbing tower wash with low amounts of water, and washing lotion phosphorus supply acid concentrates the fluorine absorption system and uses; Second and third level adopts relatively large water washing, and washing lotion is returned the phosphatase reaction system and used, and guarantees detersive efficiency.
The method of raising washing efficiency for tail gas from wet-process phosphoric acid manufacture provided by the invention, owing to will react isolated fully inside and outside the digestive shelf, when reaction digestive shelf negative-pressure operation, the outer air of groove can not enter by the space between equipment and the reactive tank in the reactive tank, this has just significantly reduced exhausted air quantity, and improved the initial concentration of fluoride in the waste gas, help the raising of detersive efficiency; And the increase washing times, can improve cleaning solution concentration, help the recycling of fluorine, cleaning solution classification utilization has reduced the discharging of waste water.
Description of drawings
Accompanying drawing is the process chart of the method for raising washing efficiency for tail gas from wet-process phosphoric acid manufacture of the present invention.Among the figure, 1 is the reaction digestive shelf, and 2 is agitator, 3 is Venturi scrubber, and 4 is the first scrubbing tower recycle liquid pump, and 5 is first scrubbing tower, 6 is the second scrubbing tower recycle liquid pump, 7 is second scrubbing tower, and 8 is gas-liquid separator, and 9 is the cleaning solution feeder, 10 is exhaust fan, 11 is the 3rd scrubbing tower recycle liquid pump, and 12 is the 3rd scrubbing tower, and 13 is tail gas discharging pipe.
The specific embodiment
On the mixing plant 2 of reactive tank 1 oil sealing is installed, the access hole cover plate is sealed, make reaction isolated fully inside and outside the digestive shelf; Earlier through one-level Venturi scrubber 3 and first scrubbing tower, 5 circulation cleanings, control cleaning solution concentration is removed most fluoride in the tail gas less than 1% from the tail gas of reaction digestive shelf 1, and washing lotion is sent by recycle liquid pump 4, and phosphorus supply acid concentrates the fluorine absorption system and uses; Tail gas after the washing enters second scrubbing tower 7, carries out circulation cleaning with relatively large water under negative pressure, and washing lotion is sent by recycle liquid pump 6, and washing lotion is returned the phosphatase reaction system and used; After tail gas came out from second scrubbing tower 7, after gas-liquid separator 8 precipitation of liquid droplets, isolated washing lotion drained into circulation fluid feeder 9; Tail gas is sent into the 3rd scrubbing tower 12 with air-flow blower fan 10, carries out circulation cleaning with greater amount water, and washing lotion circulates repeatedly by recycle liquid pump 11; The washings of the 3rd scrubbing tower 12 and second scrubbing tower 7 adopt countercurrent washing, washings are added by the 3rd scrubbing tower, overflow to the second scrubbing tower circulation cleaning behind the circulation cleaning, control adds the washing water yield so that the second scrubbing tower cleaning solution fluoro-containing concentration less than 0.1%, is sent to low temperature by recycle liquid pump 6 and dodged cooling system; Tail gas after the washing of the 3rd scrubbing tower 12 is from delivery pipe 13 emptying.
After the enforcement, compare with existing manufacturing technique, mainly contain the effect of following aspect: 1. on the mixing plant 2 of reactive tank 1 oil sealing is installed, after the access hole cover plate was sealed, waste gas was from 30000～35000m
3/ h reduction is 5000～10000m
3/ h, the concentration of fluorine has increased by 3～7 times in the waste gas; 2. adopt one-level Venturi scrubbing and three grades of hollow-spraying-tower scrubbing exhaust gas, make that the content of fluorine reaches discharging standards in the discharge tail gas, improved the washing tail gas rate.
Claims (1)
1 improves the method for washing efficiency for tail gas from wet-process phosphoric acid manufacture, and its feature comprises: the one, reactive tank is sealed, and by on the mixing plant of reactive tank, setting up oil sealing, the access hole cover plate being sealed, make inside and outside the reaction digestive shelf isolated fully; The 2nd, adopt one-level Venturi scrubbing and three grades of hollow-spraying-tower washing tail gas.
2 in accordance with the method for claim 1, and the mode that it is characterized in that described washing tail gas is countercurrent washing, and the washing lotion phosphorus supply acid of the venturi and first scrubbing tower concentrates the fluorine absorption system and uses; The washing lotion of second and third grade is returned the phosphatase reaction system and is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810068988 CN101428191B (en) | 2008-11-13 | 2008-11-13 | Method for improving washing efficiency for tail gas from wet-process phosphoric acid manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810068988 CN101428191B (en) | 2008-11-13 | 2008-11-13 | Method for improving washing efficiency for tail gas from wet-process phosphoric acid manufacture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101428191A true CN101428191A (en) | 2009-05-13 |
| CN101428191B CN101428191B (en) | 2012-12-12 |
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ID=40643956
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200810068988 Expired - Fee Related CN101428191B (en) | 2008-11-13 | 2008-11-13 | Method for improving washing efficiency for tail gas from wet-process phosphoric acid manufacture |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106166432A (en) * | 2016-08-31 | 2016-11-30 | 贵阳开磷化肥有限公司 | Iodine retracting device and recovery method thereof in a kind of Wet-process Phosphoric Acid Production tail gas |
| CN106215629A (en) * | 2016-08-31 | 2016-12-14 | 贵州开磷集团股份有限公司 | The washing methods of a kind of phosphoric acid extraction tail gas and device |
| CN106268180A (en) * | 2016-08-31 | 2017-01-04 | 贵州开磷集团股份有限公司 | A kind of Wet-process Phosphoric Acid Production washing tail gas absorption plant and method |
| CN107158918A (en) * | 2017-07-10 | 2017-09-15 | 临沂圣大环保工程有限公司 | A kind of nitrate method phosphoric acid tail gas defluorinate denitration process system and processing method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1164483C (en) * | 2001-12-14 | 2004-09-01 | 中国五环化学工程公司 | Process for preparing wet phosphoric acid by dihydrate method |
-
2008
- 2008-11-13 CN CN 200810068988 patent/CN101428191B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106166432A (en) * | 2016-08-31 | 2016-11-30 | 贵阳开磷化肥有限公司 | Iodine retracting device and recovery method thereof in a kind of Wet-process Phosphoric Acid Production tail gas |
| CN106215629A (en) * | 2016-08-31 | 2016-12-14 | 贵州开磷集团股份有限公司 | The washing methods of a kind of phosphoric acid extraction tail gas and device |
| CN106268180A (en) * | 2016-08-31 | 2017-01-04 | 贵州开磷集团股份有限公司 | A kind of Wet-process Phosphoric Acid Production washing tail gas absorption plant and method |
| CN107158918A (en) * | 2017-07-10 | 2017-09-15 | 临沂圣大环保工程有限公司 | A kind of nitrate method phosphoric acid tail gas defluorinate denitration process system and processing method |
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| Publication number | Publication date |
|---|---|
| CN101428191B (en) | 2012-12-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: GUIZHOU KAILIN GROUP CO., LTD. Free format text: FORMER NAME: KAILIN (GROUP) CO., LTD., GUIZHOU |
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| CP03 | Change of name, title or address |
Address after: No. 237 Jinyang City Kailin Lake District Road 550009 Guizhou city of Guiyang Province Patentee after: Phosphorylcholine group limited-liability company is opened in Guizhou Address before: 550002, Haitian building, No. 203 Zhonghua South Road, Guizhou, Guiyang Patentee before: Guizhou Kailin (Group) Co.,Ltd. |
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| TR01 | Transfer of patent right |
Effective date of registration: 20170620 Address after: Guizhou province Guiyang City Kaiyang County 550302 gold town (office building No. 2) Patentee after: Guizhou Kailin group mineral fertilizer limited liability company Address before: No. 237 Jinyang City Kailin Lake District Road 550009 Guizhou city of Guiyang Province Patentee before: Phosphorylcholine group limited-liability company is opened in Guizhou |
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| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121212 Termination date: 20181113 |
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| CF01 | Termination of patent right due to non-payment of annual fee |