Method of separating fluor from gases of aluminium production

专利摘要:
Fluorine from waste gases is recovered by contacting the gases with aluminum oxide in the presence of steam. The steam increases the adsorption rate of the aluminum oxide thereby improving fluorine recovery.
公开号:SU728691A1
申请号:SU1896654
申请日:1973-03-21
公开日:1980-04-15
发明作者:Стейнеке Фредрик
申请人:Элкем-Спигерверкет А/С (Фирма)；
IPC主号:

专利说明:

This invention relates to methods for extracting fluorine from electrolytic melt aluminum production gases. The known method 11 is used to extract fluorine from waste gases of electrolytic furnaces of aluminum production, including their treatment with aluminum oxide in a fluidized bed apparatus followed by heat treatment of the sorbent separated from the gas stream by known methods. The method allows purification of fluorine gases by 98%. The disadvantages of this method are the loss of fluorine during the heat treatment of alumina and the low degree of extraction of fluorine. The aim of the invention is to increase the degree of fluorine recovery. The goal is achieved by the described method of separating fluorine from aluminum production gases, including contacting the gas with. alumina in a fluidized bed reactor in the presence of water vapor in the amount of 0.5-95% of the volume of the gas mixture at temperatures of 110. The essential difference of the proposed method is to carry out the process in the presence of water vapor, its content in the gas mixture, as well as the process temperature. This difference allows increasing the degree of defluorization to 99.9%. The data in the table confirm the optimality of the selected process parameters. From the data in the table it can be seen that fluorine adsorption increases with increasing percentage of vapor in the gas phase. An increase in the vapor content in the gas mixture above 95%, as well as an increase in temperature above 500 ° C, is impractical, since there is no further increase in fluorine recovery. A decrease in c: keeping the steam below 0.5% and a decrease in the process temperature below IIO-C leads to a decrease in the degree of fluorine release.
Invention Formula
The method of separating fluorine from aluminum production gases includes the 1st contacting of gas with aluminum oxide in a fluidized bed, characterized in that, for the purpose of increasing the degree of fluorine extraction, the process is 1TROWN in the presence of water vapor at a content of 0, 6% and a temperature in the gas mixture 110-500 ° C.
Sources of information taken into account in the examination
1. The patent of France 2048338, cl. C 22 D 3/00 of 03/19/71 (prototype),

权利要求:
Claims (1)
[1]
Claim
A method for separating fluorine from aluminum production gases, including contacting the gas with aluminum oxide in a fluidized bed, characterized in that, in order to • increase the degree of fluorine extraction, the process is carried out in the presence of water vapor when it is contained in a gas mixture of 0.5 ~ 95 vol. % and a temperature of 20 110-500 ° C.

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同族专利:

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公开号 | 公开日

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CS189591B2|1979-04-30|

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HU165523B|1974-09-28|

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FR2176817A1|1973-11-02|

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SE436736B|1985-01-21|

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YU39270B|1984-10-31|

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BE797066A|1973-07-16|

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DE2313495A1|1973-10-04|

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ES412890A1|1975-12-16|

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CA982786A|1976-02-03|

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BR7302019D0|1974-07-25|

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NL7303509A|1973-09-25|

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FR2176817B1|1976-04-09|

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NO131825B|1975-05-05|

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NL154989B|1977-11-15|

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ZA731280B|1974-10-30|

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YU59573A|1982-06-30|

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NO131825C|1975-08-13|

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DE2313495C2|1982-10-07|

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OA04670A|1980-12-31|

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CH588417A5|1977-05-31|

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JPS5792B2|1982-01-05|

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AT322867B|1975-06-10|

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IT979616B|1974-09-30|

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US3813852A|1974-06-04|

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GB1389769A|1975-04-09|

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JPS497191A|1974-01-22|

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AU5356173A|1974-09-26|

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SU728691A3|1980-04-15|

引用文献:

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CA613352A|1961-01-24|Aluminum Company Of America|Electrolytic production of aluminum|

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US2059553A|1933-10-02|1936-11-03|Harry V Churchill|Removal of fluorine from water|

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US3503184A|1968-03-07|1970-03-31|Aluminum Co Of America|Treatment of gases evolved in the production of aluminum|

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US3721066A|1970-12-29|1973-03-20|Teller Environmental Systems|Process for recovery of acid gases|

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US3760565A|1971-07-19|1973-09-25|Aluminum Co Of America|Anti-pollution method|JPS5269284U|1976-08-17|1977-05-23|

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US6514471B1|2000-10-31|2003-02-04|Air Products And Chemicals, Inc.|Removing fluorine from semiconductor processing exhaust gas|

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GB0101769D0|2001-01-24|2001-03-07|Ineos Fluor Ltd|Decomposition of fluorine compounds|

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US7569193B2|2003-12-19|2009-08-04|Applied Materials, Inc.|Apparatus and method for controlled combustion of gaseous pollutants|

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US7736599B2|2004-11-12|2010-06-15|Applied Materials, Inc.|Reactor design to reduce particle deposition during process abatement|

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JP5102217B2|2005-10-31|2012-12-19|アプライドマテリアルズインコーポレイテッド|Process reduction reactor|

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JP6090845B2|2013-03-06|2017-03-08|国立研究開発法人農業・食品産業技術総合研究機構|Suction type seed selection device|

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CN104911631A|2015-06-18|2015-09-16|中国科学院过程工程研究所|Novel method for efficiently purifying aluminum electrolysis fluorine-containing flue gas by using porous alumina|

法律状态:

优先权:

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申请号 | 申请日 | 专利标题

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NO943/72A|NO131825C|1972-03-22|1972-03-22|

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