CN1495295A - Method for removing fluorinl and removing dust from waste gas produced by fused salt electrolysis of rare earth metal in fluorination system - Google Patents
Method for removing fluorinl and removing dust from waste gas produced by fused salt electrolysis of rare earth metal in fluorination system Download PDFInfo
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- CN1495295A CN1495295A CNA021148201A CN02114820A CN1495295A CN 1495295 A CN1495295 A CN 1495295A CN A021148201 A CNA021148201 A CN A021148201A CN 02114820 A CN02114820 A CN 02114820A CN 1495295 A CN1495295 A CN 1495295A
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Abstract
The present invention provides a method for removing fluorine and removing dust from waste gas produced by fused salt electrolysis of rare earth metal in fluorination system. It includes the processes of devices of gas and dust collection, electrolyte absorption, dust settling chamber gravitational settling and filter screen filtration. The ammonia gas is introduced into the waste gas produced by electrolysis to make the flurine be formed into the ammine fluoride fine small granules, then the fine small ammine fluoride granules and dust are fed into the settling chamber and undergone the processes of secondary natural settling and once filter screen treatment. After fluorine-removing and dust-removing treatment the smoke-dust can be reached to discharge standard.
Description
The invention provides a method for removing fluorine and dust from rare earth metal waste gas generated by fused salt electrolysis of a fluoridation system, belonging to the technical field of environmental protection and metallurgy.
At present, rare earth metal production in China, particularly ionic rare earth in south China mostly adopts a fluoride system molten salt electrolysis process, and the process usually generates a certain amount of waste gas containing fluorine and rare earth dust in the production process, but because the content of fluorine in the waste gas generated in the production process is not high 1; 2. a set of equipment with good effects of removing fluorine and dust is required to be constructed, and the investment is large; 3. the simple and applicable method for treating the fluorine-containing waste gas has the defects of not mature technology and the like; therefore, most production enterprises directly discharge the waste gas generated in the production process without treatment, thereby causing environmental pollution. The fluorine-containing gas can cause harm to animals, plants and human bodies, and the rare earth-containing dust is discharged into the environment, thereby wasting rare earth resources and causing harm to human bodies.
The invention aims to provide a method for removing fluorine and dust from rare earth metal waste gas generated by the fused salt electrolysis of a fluoridation system, so that the waste gas generated in the production process reaches the national emission standard after being treated, thereby protecting the environment and recycling rare earth.
The technical scheme adopted by the invention is as follows: a process for removing fluorine and dust from the waste gas generated by electrolyzing RE metal in fused salt in fluorizating system includes collecting gas, collecting dust, absorbing electrolyte, gravitational settling in dust settling chamber and filtering by net filter, collecting the waste gas containing dust by mechanical ventilation, and adding NH to the waste gas generated by electrolysis3After ammonia gas is introduced,the PH value of the waste gas in the pipeline is 6.5-7.5, and the fluorine-containing waste gas is changed into NH4F, ammonium fluoride is fine particle precipitate, the ammonium fluoride and the dust-containing waste gas enter a first dust drop chamber together and pass through a dust removal net
After the fine particles are adsorbed on the dust removal net, the fine particles enter the second settling chamber to be discharged, so that the waste gas after dust removal reaches the emission standard.
FIG. 1 is a process flow diagram of the present invention.
Example (b):
collecting the dust and waste gas generated in the process of electrolyzing the rare earth molten salt (mainly fluorinated gas and dust with rare earth) by a mechanical ventilation mode, and absorbing by adopting electrolyte (namely introducing NH into the waste gas generated by electrolysis)3↓) of the reaction is: the fine ammonium fluoride precipitate and waste gas are gravitationally settled in a dust settling chamber, which is divided into two parts of 3X 0.9m2The filter screens of the filter are separated from each other,the dust is treated by secondary natural sedimentation and primary filter screen filtration. The content of fluorine in the smoke dust after the dust falling chamber gravity fluorine removal and dust fall treatment is 14.61mg/m before the treatment3Reduced to 2.44mg/m33 and 1.65mg/m3The defluorination rate reaches 86.04 percent, and the dust concentration in the exhaust flue is 23.39mg/m before treatment30. Reduced to 4.19mg/m3And the fluorine removal rate reaches 82.09 percent. The effects of defluorination and dust removal all reach the national emission standard.
The invention has the following characteristics:
1. the process has the advantages of simple equipment, low investment and high dust removal efficiency, and the fluorine removal rate is 86.04% and the dust removal rate is 82.09% after the process.
2. In the process, a dust removal net is additionally arranged between two settling chambers, so that fine particles are adsorbed on the dust removal net, and the fluorine removal and dust removal efficiency is improved.
3. Dust in the settling chamber is periodically recovered, useful rare earth elements are recovered, and rare earth resources are recovered while the environment is protected.
4. The process does not produce secondary pollution.
Claims (4)
1. A method for removing fluorine and dust from the waste gas generated by electrolyzing rare-earth metal in fused salt in fluoridizing system includes collecting gas and dust, absorbing electrolyte, gravitational settling in dust settling chamber and filtering by filter net.
2. The method for removing fluorine and dust from the waste gas generated in the electrolysis of rare earth metals by using the fluoride system molten salt as claimed in claim 1, wherein the waste gas generated in the electrolysis is collected by a gas collection and dust collection hood.
3. The method for removing fluorine and dust from the waste gas generated in the fused salt electrolysis of the fluoridation system to the rare earthmetal according to claim 1, wherein the pH of the waste gas in the pipeline is 6.5-7.5 after ammonia gas is introduced.
4. The method for removing fluorine and dust from the waste gas generated in the fused salt electrolysis of rare earth metals in a fluoridation system according to claim 1, wherein the waste gas after being introduced with ammonia gas is required to enter a first settling chamber, and fine particles are adsorbed on a dust removing net through the dust removing net and then enter a second settling chamber for discharge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021148201A CN1495295A (en) | 2002-01-30 | 2002-01-30 | Method for removing fluorinl and removing dust from waste gas produced by fused salt electrolysis of rare earth metal in fluorination system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021148201A CN1495295A (en) | 2002-01-30 | 2002-01-30 | Method for removing fluorinl and removing dust from waste gas produced by fused salt electrolysis of rare earth metal in fluorination system |
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| Publication Number | Publication Date |
|---|---|
| CN1495295A true CN1495295A (en) | 2004-05-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CNA021148201A Pending CN1495295A (en) | 2002-01-30 | 2002-01-30 | Method for removing fluorinl and removing dust from waste gas produced by fused salt electrolysis of rare earth metal in fluorination system |
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| CN (1) | CN1495295A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102527216A (en) * | 2011-12-28 | 2012-07-04 | 徐州安联木业有限公司 | Device for purifying and recycling harmful steam emitted in hot pressing of plywood |
| CN103143235A (en) * | 2013-02-28 | 2013-06-12 | 包头稀土研究院 | Method for treating tail gas during production process for rare-earth metals and alloys |
| CN105132955A (en) * | 2015-08-25 | 2015-12-09 | 赣州三友稀土新材料有限公司 | Movable rare earth electrolysis cell flue gas absorption device |
| CN105603459A (en) * | 2016-02-03 | 2016-05-25 | 中南大学 | Rare-earth electrolysis fume cleaning system and method |
| CN106745340A (en) * | 2016-12-31 | 2017-05-31 | 山东飞源科技有限公司 | The method that heavy metal nickel is reclaimed from the fluorine-containing electrolysis fused salt of height |
| CN110804747A (en) * | 2019-11-22 | 2020-02-18 | 乐山有研稀土新材料有限公司 | Smoke dust recovery system and method of rare earth electrolytic cell |
-
2002
- 2002-01-30 CN CNA021148201A patent/CN1495295A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102527216A (en) * | 2011-12-28 | 2012-07-04 | 徐州安联木业有限公司 | Device for purifying and recycling harmful steam emitted in hot pressing of plywood |
| CN102527216B (en) * | 2011-12-28 | 2014-06-25 | 徐州安联木业有限公司 | Device for purifying and recycling harmful steam emitted in hot pressing of plywood |
| CN103143235A (en) * | 2013-02-28 | 2013-06-12 | 包头稀土研究院 | Method for treating tail gas during production process for rare-earth metals and alloys |
| CN103143235B (en) * | 2013-02-28 | 2014-09-03 | 包头稀土研究院 | Method for treating tail gas during production process for rare-earth metals and alloys |
| CN105132955A (en) * | 2015-08-25 | 2015-12-09 | 赣州三友稀土新材料有限公司 | Movable rare earth electrolysis cell flue gas absorption device |
| CN105603459A (en) * | 2016-02-03 | 2016-05-25 | 中南大学 | Rare-earth electrolysis fume cleaning system and method |
| CN105603459B (en) * | 2016-02-03 | 2018-05-11 | 中南大学 | Rare Earth Electrolysis flue gas purification system and method |
| CN106745340A (en) * | 2016-12-31 | 2017-05-31 | 山东飞源科技有限公司 | The method that heavy metal nickel is reclaimed from the fluorine-containing electrolysis fused salt of height |
| CN106745340B (en) * | 2016-12-31 | 2018-12-28 | 山东飞源科技有限公司 | The method of heavy metal nickel is recycled from high fluorine-containing electrolysis fused salt |
| CN110804747A (en) * | 2019-11-22 | 2020-02-18 | 乐山有研稀土新材料有限公司 | Smoke dust recovery system and method of rare earth electrolytic cell |
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