CN1124368C - Method for cleaning fluorinated flur gas produced by aluminium electrolysis - Google Patents
Method for cleaning fluorinated flur gas produced by aluminium electrolysis Download PDFInfo
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- CN1124368C CN1124368C CN99110828A CN99110828A CN1124368C CN 1124368 C CN1124368 C CN 1124368C CN 99110828 A CN99110828 A CN 99110828A CN 99110828 A CN99110828 A CN 99110828A CN 1124368 C CN1124368 C CN 1124368C
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- flue gas
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- fluorinated alumina
- alumina
- aluminum oxide
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Abstract
The present invention relates to a method for cleaning fluorinated flue gas produced by aluminum electrolysis, which is characterized in that two stages of adsorption and cleaning are adopted; firstly, fluorin carrying alumina is used for adsorbing initial flue gas with high fluorin containing concentration; then, active high fresh alumina is used for further adsorbing remnant fluoride in the flue gas. The purification efficiency of fluorin is enhanced by the method of the present invention, and the circulation volume of the alumina is reduced. The broken consumption and the influence of the quality of metal aluminum because of the increase of silicon and iron impurities in the alumina caused by multiple times of circulation of alumina are avoided.
Description
The invention belongs to the industrial gaseous waste Prevention Technique, or rather, is the purifying method of smoking gas containing fluorine in a kind of electrolysis production metallic aluminium process.
In the process of electrolytic process production metallic aluminium, produce a large amount of smoking gas containing fluorines, if directly enter atmosphere without purifying treatment, to cause electrolytic aluminium plant plant area and surrounding environment to be subjected to the pollution of fluorine, therefore, the purifying treatment of electrolysis of aluminum smoking gas containing fluorine is the important environmental protection problem that electrolytic aluminium plant faces.
For many years, China's Aluminium Electrolysis is continued to use general in the world dry method adsorption and purification technology always, be sorbent material promptly with Aluminium Electrolysis raw material one aluminum oxide, fluorochemical (mainly being HF) under specified criteria in the absorption flue gas, fluorinated alumina after the absorption, a part is returned electrolyzer and is made raw material, and a part adds conversion zone with fresh aluminum oxide, flue gas is carried out disposable absorption (non-ferrous metal environmental protection, second phase nineteen ninety).This method exists purification efficiency low, the solid-gas ratio height, and aluminum oxide is broken serious and cause fine particle to fly upward and the shortcomings such as loss brought.
The objective of the invention is to overcome the shortcoming of prior art, propose a kind of two sections method for adsorbing and purifying.
Realize the main technical schemes of the object of the invention: at first with the high initial flue gas of fluorinated alumina absorption fluoro-containing concentration, and then further adsorb residue fluorochemical in the flue gas, thereby make the more thorough of fluorochemical adsorption cleaning in the flue gas with the high fresh aluminum oxide of activity.
Method of the present invention comprises following process:
1. adopt the fluorinated alumina adsorbed behind the smoking gas containing fluorine that the higher initial flue gas of fluoro-containing concentration that comes from electrolyzer is carried out adsorbing first time, its operational condition: the solid fluorinated alumina is 20～30 gram/rice with the ratio of initial flue gas
3, flue gas flow rate is 12～24 meter per seconds, adsorption time 0.5～1 second;
2. go on foot reacted flue gas (containing fluorinated alumina) and fresh aluminum oxide reaction by (1), flue gas is carried out the absorption second time, its operational condition: fresh aluminum oxide goes on foot in the reacted flue gas with (1), makes solid-gas ratio bring up to 26～40 gram/rice
3, flue gas flow rate is 12～24 meter per seconds, adsorption time 〉=1 second;
3. with the flue gas after (2) step absorption with carry an aluminum fluoride and enter bag filter together and carry out solid and gas and separate, wherein a fluorinated alumina part is returned (1) and is gone on foot and recycle, and a part is returned electrolyzer and made raw material, and purified gas enters atmosphere by blower fan, chimney.
Described fresh aluminum oxide is the used raw material of electrolysis production metallic aluminium.
Method advantage of the present invention and effect:
The present invention is applicable to the purifying treatment of all prebaked cell for aluminum-reduction smoking gas containing fluorines, compare the purification efficiency that not only improves fluorine with existing dry cleaning technology, and reduced the add-on of fresh aluminum oxide, reduce the reaction solid-gas ratio, avoid aluminum oxide repeatedly to circulate, the loss that causes its broken serious fine particle that causes to fly upward and bring also avoids repeatedly circulating the increase that makes silicon in the aluminum oxide, iron contamination and the quality that influences metallic aluminium.Method of the present invention and known dry method adsorption and purification technology comparative data see Table 1.
Also further specify characteristics of the present invention in conjunction with the accompanying drawings below by example.
Embodiment
Fig. 1 is a schema of the present invention;
Described by Fig. 1, enter horizontal feed bed formula from the initial flue gas of the total smoke pipe 4 of electrolytic cell and react main smoke pipe section L1(L
1=9 meters), at first with by the fluorinated alumina of fluorinated alumina logical sequence 1 through revolving plow reclaimer 2 and impulse flowmeter 3 outflows under turbulent condition, mix at its entrance, and consolidating/gas is 30 grams/rice3, flue gas flow rate is under the condition of 18 meter per seconds, to finish the first paragraph Dry Adsorption in 0.5 second time, is being L apart from this 9m place1The other end by fresh aluminum oxide logical sequence 5 through the active high fresh aluminum oxide of revolving plow reclaimer 2 ' and impulse flowmeter 3 ' inflows, admittedly make gas/bring up to 40 grams/meter3, at L2Section (L2=18 meters), to finish in 1 second Two sections absorption, the flue gas after the purification and fluorinated alumina enter action of low-voltage pulse bag hose 6 to be carried out solid and gas and separates, Flue gas after the purification enters atmosphere by bag hose 6 outlets through blower fan 9 and chimney 10; What bag hose captured carries Fluorine alumina rises in the fluorinated alumina storehouse 1 by jet pump 7 (containing Roots blower 8), the part circulation Again be used as the absorption flue gas, part send electrolytic cell as producing the metallic aluminium raw material. Equipment described in the figure is equal It is common equipment. Experimental results: purification efficiency reaches 99%; It is assorted to be used for purifying the aluminium oxide that adsorbs Matter content: SiO2＜0.025％，Fe
2O
8＜0.020%; And the aluminium oxide breakage is not serious.
Two kinds of purification techniques of table 1 relatively
| Top order title | Purification techniques of the present invention | The known general-purpose dry technique |
| The adsorption section solid-gas ratio | One section 20～30 gram/rice3Two section 26～40 gram/rice3 | 50～60 grams/rice3 |
| Flue gas flow rate | Two section 18 meter per second of one section 18 meter per second | 18 meter per seconds |
| Adsorption time | One section 0.5～1 second two sections 〉=1.0 | 1～1.5 second |
| When the bag hose efficiency of dust collection is 99.9%, deduster outlet dust content | ≤ 40 milligrams/meter3 | ≤ 60 milligrams/meter3 |
| The purification efficiency of fluorine in the flue gas | 98.5～99％ | 96～98％ |
| Be used for adsorption and oxidation aluminium major impurity content, % | SiO 2≤0.025 Fe 2O 3≤0.020 | SiO 2 0.028 Fe 2O 3 0.030 |
| The broken situation of aluminium oxide | Broken light, subparticle is few | Broken serious, subparticle is many |
Claims (2)
1. the purifying method of an electrolysis of aluminum smoking gas containing fluorine is characterized in that adopting following scavenging process:
(1) adopt and to adsorb the fluorine-containing initial flue gas that the fluorinated alumina behind the smoking gas containing fluorine comes electrolyzer and carry out adsorbing first time, its operational condition: fluorinated alumina is 20～30 gram/rice with the ratio of initial flue gas
3, flue gas flow rate is 12～24 meter per seconds, adsorption time 0.5～1 second;
(2) reacted with the fresh aluminum oxide that adds by the reacted flue gas that contains fluorinated alumina of (1) step, the residue fluorochemical in the flue gas is carried out the absorption second time, its operational condition: solid-gas ratio is brought up to 26～40 gram/rice
3, flue gas flow rate is 12～24 meter per seconds, adsorption time 〉=1 second;
(3) enter bag filter by (2) step reacted flue gas and fluorinated alumina mixture and carry out solid and gas and separates, wherein a fluorinated alumina part is returned (1) and is gone on foot and recycle, and a part is returned electrolyzer and made raw material, and Purge gas enters atmosphere.
2. in accordance with the method for claim 1, it is characterized in that described fresh aluminum oxide of (2) step is for producing the used raw material of metallic aluminium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99110828A CN1124368C (en) | 1999-07-22 | 1999-07-22 | Method for cleaning fluorinated flur gas produced by aluminium electrolysis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99110828A CN1124368C (en) | 1999-07-22 | 1999-07-22 | Method for cleaning fluorinated flur gas produced by aluminium electrolysis |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1281907A CN1281907A (en) | 2001-01-31 |
| CN1124368C true CN1124368C (en) | 2003-10-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99110828A Expired - Fee Related CN1124368C (en) | 1999-07-22 | 1999-07-22 | Method for cleaning fluorinated flur gas produced by aluminium electrolysis |
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| CN (1) | CN1124368C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100362140C (en) * | 2004-07-06 | 2008-01-16 | 贵阳铝镁设计研究院 | Fluoride purification process in electrolytic production of aluminum and dust collector therefor |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102495006A (en) * | 2011-11-22 | 2012-06-13 | 中国铝业股份有限公司 | Method for detecting non-anode effect CF4 |
| CN103223284A (en) * | 2013-05-14 | 2013-07-31 | 沈阳城顺达工业技术有限公司 | Two-stage countercurrent reaction dust collection device of pre-separation circulating fluidized bed |
| CN105088282B (en) * | 2015-08-31 | 2017-09-26 | 晟通科技集团有限公司 | Aluminum electrolysis flue gas purification system and the method for controlling its passage that feeds intake |
| CN105112944B (en) * | 2015-08-31 | 2017-11-03 | 晟通科技集团有限公司 | Aluminum oxide charging device for aluminum electrolysis flue gas purification system |
| CN110295376B (en) * | 2019-07-12 | 2024-03-22 | 东方电气集团东方锅炉股份有限公司 | Electrolytic aluminum flue gas purification system and process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1033508A (en) * | 1987-12-15 | 1989-06-28 | 包头钢铁公司环境保护研究所 | Dry cleaning contains the method and apparatus that mixes the harmful components flue gas |
| CN1239742A (en) * | 1998-06-22 | 1999-12-29 | 田应甫 | Dry fume purifying system for self-roasting anodic aluminium electrolysis |
-
1999
- 1999-07-22 CN CN99110828A patent/CN1124368C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1033508A (en) * | 1987-12-15 | 1989-06-28 | 包头钢铁公司环境保护研究所 | Dry cleaning contains the method and apparatus that mixes the harmful components flue gas |
| CN1239742A (en) * | 1998-06-22 | 1999-12-29 | 田应甫 | Dry fume purifying system for self-roasting anodic aluminium electrolysis |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100362140C (en) * | 2004-07-06 | 2008-01-16 | 贵阳铝镁设计研究院 | Fluoride purification process in electrolytic production of aluminum and dust collector therefor |
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| Publication number | Publication date |
|---|---|
| CN1281907A (en) | 2001-01-31 |
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