NO742076L - - Google Patents
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- Publication number
- NO742076L NO742076L NO742076A NO742076A NO742076L NO 742076 L NO742076 L NO 742076L NO 742076 A NO742076 A NO 742076A NO 742076 A NO742076 A NO 742076A NO 742076 L NO742076 L NO 742076L
- Authority
- NO
- Norway
- Prior art keywords
- carried out
- adsorbents
- division
- pyrohydrolysis
- oxide
- Prior art date
Links
- 238000000034 method Methods 0.000 claims description 19
- 239000007789 gas Substances 0.000 claims description 17
- 239000003463 adsorbent Substances 0.000 claims description 11
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 9
- 239000000428 dust Substances 0.000 claims description 7
- 150000002222 fluorine compounds Chemical class 0.000 claims description 7
- 238000005660 chlorination reaction Methods 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 4
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 229910000041 hydrogen chloride Inorganic materials 0.000 claims description 4
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 claims description 4
- 229910001388 sodium aluminate Inorganic materials 0.000 claims description 4
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- 241000273930 Brevoortia tyrannus Species 0.000 claims description 2
- 239000012717 electrostatic precipitator Substances 0.000 claims 1
- 238000005868 electrolysis reaction Methods 0.000 description 11
- 238000001179 sorption measurement Methods 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 150000001875 compounds Chemical class 0.000 description 7
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 5
- 229910052731 fluorine Inorganic materials 0.000 description 5
- 239000011737 fluorine Substances 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminum fluoride Inorganic materials F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 3
- 229910052720 vanadium Inorganic materials 0.000 description 3
- IRPGOXJVTQTAAN-UHFFFAOYSA-N 2,2,3,3,3-pentafluoropropanal Chemical compound FC(F)(F)C(F)(F)C=O IRPGOXJVTQTAAN-UHFFFAOYSA-N 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- -1 cryolite Chemical class 0.000 description 2
- 229910001610 cryolite Inorganic materials 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000005194 fractionation Methods 0.000 description 2
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000274 adsorptive effect Effects 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 239000012084 conversion product Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- PPPLOTGLKDTASM-UHFFFAOYSA-A pentasodium;pentafluoroaluminum(2-);tetrafluoroalumanuide Chemical compound [F-].[F-].[F-].[F-].[F-].[F-].[F-].[F-].[F-].[F-].[F-].[F-].[F-].[F-].[Na+].[Na+].[Na+].[Na+].[Na+].[Al+3].[Al+3].[Al+3] PPPLOTGLKDTASM-UHFFFAOYSA-A 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/68—Halogens or halogen compounds
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Description
Fremgangsmåte til opparbeidelse av aluminiumoksyd, natriumaluminat og/eller alkalisert aluminiumoksyd anvendt til utskillelse av fluorforbindelser fra avgasser. Process for processing aluminum oxide, sodium aluminate and/or alkalized aluminum oxide used for the separation of fluorine compounds from exhaust gases.
Oppfinnelsen vedrører en fremgangsmåte til opparbeidelse av aluminiumoksyd, natriumaluminat og/eller alkalisert aluminiumoksyd anvendt til utskillelse av fluorforbindelser fra avgasser. The invention relates to a method for processing aluminum oxide, sodium aluminate and/or alkalized aluminum oxide used for the separation of fluorine compounds from exhaust gases.
Slike stoffer anvendes spesielt til tørr adsorptiv rens-ning av fluorholdige avgasser fra aluminiumelektrolysecelle, f.eks. således at tørradsorpsjonen foregår i et sterkt ekspandert aluminiumoksyd- hvirvelsj ikt . Such substances are used in particular for dry adsorptive cleaning of fluorine-containing exhaust gases from aluminum electrolysis cells, e.g. so that the dry adsorption takes place in a strongly expanded aluminum oxide vortex layer.
Smeltestrømelektrolysen til fremstilling av oppberednings-aluminium omtales teknisk ved temperatur nær 1000°C. Som elektrolytt tjener en smelte av kryolitt som ofte tilsettes et overskudd av aluminiumfluorid samt andre tilsetninger som kalsiumfluorid og The melting current electrolysis for the production of preparation aluminum is technically referred to at a temperature close to 1000°C. As electrolyte, a melt of cryolite is used, to which is often added an excess of aluminum fluoride as well as other additives such as calcium fluoride and
litiumfluorid.lithium fluoride.
Ved den relativt høye elektrolysetemperatur har elektrolytten et merkbart damptrykk. Følgelig inneholder ..elektrolysecellenes avgasser flyktige fluorforbindelser, respektivt deres omdannelses-produkter som er inneholdt i den avkjølte avgass i form av faste forbindelser som kryolitt, aluminiumfluorid, chiolitt, som fint støv ved siden av forstøvet aluminiumoksyd. At the relatively high electrolysis temperature, the electrolyte has a noticeable vapor pressure. Consequently, the exhaust gases of the electrolysis cells contain volatile fluorine compounds, respectively their conversion products which are contained in the cooled exhaust gas in the form of solid compounds such as cryolite, aluminum fluoride, chiolite, as fine dust next to atomized aluminum oxide.
Dessuten inneholder avgassen gassformet hydrogenfluoridIn addition, the exhaust gas contains gaseous hydrogen fluoride
som oppstår sekundært ved hydrolyse av de nevnte fluorfirbindelser.which occurs secondarily by hydrolysis of the mentioned fluorine compounds.
Alt etter typen avsugning og fortynning inneholder avgassene inntil 1000 mg HF/Nm , vanligvis imidlertid mindre enn 100 mg HF/Nm . Støvinnholde.t i avgassen ligger i samme størrelsesorden. Depending on the type of extraction and dilution, the exhaust gases contain up to 1,000 mg HF/Nm, but usually less than 100 mg HF/Nm. The dust content in the exhaust gas is in the same order of magnitude.
Mens hittil fjerning av fl.uorhydrogenet i praksis over-værende foregikk ved våtvask,.er det i nyere tid også kjent for-skjellige tørradsorpsjonsfremgangsmåter. Spesielt gunstig økonomisk arbeider fremgangsmåten omtalt i DOS 2.056.096 hvor tørradsorpsjonen foregår i et sterkt ekspandert aluminiumoksyd-hvirvelsjikt. Ved ' anvendelse av sistnevnte fremgangsmåte i praksis har det vist seg at for gassrensningen behøver det bare å anvendes en mengde på 10% eller mindre av det samlede for elektrolysen nødvendig oksyd. While until now the removal of the fluorine hydrogen in practice mostly took place by wet washing, in recent times various dry adsorption methods are also known. The method described in DOS 2,056,096, where the dry adsorption takes place in a highly expanded aluminum oxide fluidized bed, works particularly economically. When using the latter method in practice, it has been shown that for the gas purification it is only necessary to use an amount of 10% or less of the total oxide required for the electrolysis.
Sammen med fl'uorforbindelsene unnviker med ovnsavgassene også andre forbindelser, f. eks', av fosfor, vanadium, jern, titan, svovel, silisium etc. Det er i detalj ikke klart om disse forbindelser fremkommer primært under tiden som gassformede forbindelser sekundært gjenfinner de seg likeledes som faste forbindelser i den til fluoradsorpsjonen anvendte aluminiumoksyd og lignende. Ved til-bakeføring av dette oksyd i elektrolysecellene kommer også disse forurensninger i elektrolytten og forårsaker en nedgang av elektro-lysedriften, respektiv.av kvaliteten av det frembragte metall. Det er allerede kjent en fremgangsmåte ved en etterbehandling av det fluoropplagede oksyd sterkt å fjerne et forstyrrende karboninnhold ved at de faste stoffer som ble anvendt til avgassrensning og deretter bestemt til anvendelse i elektrolyseovnene og som ved siden av fluor dessuten inneholder ytterligere forbindelser og elementer, spesielt også karbon i form av kullstøv, underkastes en termisk behandling hvor karbonet fjernes ved forbrenning og fluoret som ved avgassrensningen overveiende opptas adsorptivt som hydrogenfluorid og ikke fastbundet fluor overføres i en stabil kjemisk Along with the fluorine compounds, other compounds also escape with the furnace exhaust gases, e.g. phosphorus, vanadium, iron, titanium, sulphur, silicon etc. It is not clear in detail whether these compounds appear primarily during the time that gaseous compounds secondarily find them likewise as solid compounds in the alumina used for fluoride adsorption and the like. When this oxide is fed back into the electrolysis cells, these impurities also enter the electrolyte and cause a decrease in the electrolysis operation, respectively, in the quality of the metal produced. It is already known a method for a post-treatment of the fluorine-affected oxide to strongly remove a disturbing carbon content in that the solid substances which were used for exhaust gas purification and then intended for use in the electrolysis furnaces and which, in addition to fluorine, also contain further compounds and elements, in particular also carbon in the form of coal dust, is subjected to a thermal treatment where the carbon is removed by combustion and the fluorine, which during the exhaust gas treatment is mainly taken up adsorptively as hydrogen fluoride and unbound fluorine is transferred in a stable chemical
aluminiumfluorforbindelse.aluminum fluoride compound.
Til grunn for oppfinnelsen ligger den oppgave å tilveie-bringe en som innledningsvis forklart fremgangsmåte-, hvor de ovennevnte forurensninger, dvs. forbindelser f.eks. av fosfor, vanadium, jern, titan,ssvovel, silisium etc., fjernes respektiv virknings-fullt kan' nedsettes fra systemet elektrolyseovn/adsorberer. Ifølge oppfinnelsen oppnås dette ved at adsorbentene behandles ved pyrohydrolyse eller klorering. På denne måte lykkes en sterkt eller fullstendig eliminering av forurensningen. The invention is based on the task of providing a method, as explained at the outset, where the above-mentioned contaminants, i.e. compounds, e.g. of phosphorus, vanadium, iron, titanium, sulphur, silicon etc., are removed or effectively can be reduced from the electrolysis furnace/adsorber system. According to the invention, this is achieved by treating the adsorbents by pyrohydrolysis or chlorination. In this way, a strong or complete elimination of the pollution succeeds.
Ved en utførelsesform av oppfinnelsen er det foreskrevet at adsorbentene før opparbeidelsen oppdeles i kornfraksjoner. Derved adskiller hensiktsmessig fraksjoner under 20 ym, fortrinnsvis under 15 ym som inneholder hovedmengden av forurensninger. Det ble nemlig fastslått at d.e nevnte skadelige forurensninger er anriket i finfraksjonen og den ved- fluoradsorpsjonen dannede aluminiumoksyd-støvblanding. En sikteanalyse viste f.eks. at over 10% av det det fluoroppladede oksyd inneholdt i jern og vanadium er inneholdt i den fineste fraksjon under 20 ym, fortrinnsvis under 15 ym som utgjør ca. 20% av oksyd-støvblandingen.'■ Denne arbeidsmåte er også fordel ved anvendelse av grovkornede adsorbenter. In one embodiment of the invention, it is prescribed that the adsorbents are divided into grain fractions before processing. Thereby, fractions below 20 µm, preferably below 15 µm, which contain the main amount of contaminants, are suitably separated. It was determined that the aforementioned harmful pollutants are enriched in the fine fraction and the alumina dust mixture formed by fluoride adsorption. A target analysis showed e.g. that over 10% of the fluorine-charged oxide contained in iron and vanadium is contained in the finest fraction below 20 ym, preferably below 15 ym which amounts to approx. 20% of the oxide-dust mixture.'■ This method of working is also advantageous when using coarse-grained adsorbents.
En variant av ovennevnte fremgangsmåte består i at oppdelingen i kornfraksjoner foretas ved vindsiktning. Hertil skal følgende eksempel tjene: Kornfraksjonering av et fluoroppladet oksyd ved vindsiktning. A variant of the above-mentioned method consists in the division into grain fractions being carried out by wind screening. The following example will serve for this purpose: Grain fractionation of a fluorine-charged oxide by wind screening.
Ytelse av vindsikteren: 1 tonn pr. time.Performance of the wind sifter: 1 tonne per hour.
Skillesnitt: under 20 ym.Separation: less than 20 ym.
Det er imidlertid også mulig å gjennomføre oppdelingen i kornfraksjoner ved siktning. Følgende er et eksempel på dette: However, it is also possible to carry out the division into grain fractions by sieving. The following is an example of this:
Kornfraksjonering av -en fluoroppladet oksyd-støvblanding ved siktning. ty.' Grain fractionation of -a fluorine-charged oxide-dust mixture by sieving. resort.'
En utførelsesform av fremgangsmåten ifølge oppfinnelsen sees deri at oppdeling i kornfraksjoner allerede foretas ved uttak av adsorbentene fra adsorbereren. Videre er det mulig at oppdelingen foretas ved hjelp.av elektrofilter utrystet med flere felt og støv-bunkere. An embodiment of the method according to the invention is seen in that division into grain fractions is already carried out when the adsorbents are removed from the adsorber. Furthermore, it is possible that the division is carried out with the help of an electrofilter equipped with several fields and dust bunkers.
Hensiktsmessig foregår pyrohydrolysen ved temperaturAppropriately, the pyrohydrolysis takes place at temperature
over 500°C, fortrinnsvis over 600°C. Eksempelvis foregår dette således at det til adsorpsjon anvendte oksyd etter oppladning underkastes en pyrohydrolysej f.eks. en dreierørsovn, ved ca. 650-700°C. Derved unnviker hydrogenklorid i konsentrert form som kan absorberes i en liten tørke- eller våtrensapparatur.. Hertil er det nødvendig ved pyrohydrolysen å anvende en temperatur ikke vesentlig over 750°C da ellers .en' spesifikk overflate og dermed adsorpsjonsgass-kapa si teten ville nedsettes. Det sterkt avfluorerte oksyd kan igjen anvendes til absorpsjon av hydrogenfluorid fra.ovnsavgassene. Denne cyklus lar seg gjenta seks til ti ganger uten at det inntrer en forstyrrende nedgang av adsorpsjonskapasiteten. Etter siste cyklus underkastes oksydet ved f.eks. 1000°C en pyrohydrolyse og kan til-føres en anvendelse f.eks. i den kjeramiske ildfastindustri. above 500°C, preferably above 600°C. For example, this takes place in such a way that the oxide used for adsorption is subjected to pyrohydrolysis after charging, e.g. a rotary tube furnace, at approx. 650-700°C. This avoids hydrogen chloride in concentrated form which can be absorbed in a small drying or wet cleaning apparatus. For this purpose, it is necessary for the pyrohydrolysis to use a temperature not significantly above 750°C, otherwise the specific surface and thus the adsorption gas capacity would be reduced . The strongly defluorinated oxide can again be used for absorption of hydrogen fluoride from the furnace exhaust gases. This cycle can be repeated six to ten times without a disturbing decrease in the adsorption capacity occurring. After the last cycle, the oxide is subjected to e.g. 1000°C a pyrohydrolysis and can be added to an application e.g. in the ceramic refractory industry.
Forsøket har vist at ■ kloreringen foretas med klor-gass'og/eller hydrogenkloridgass hensiktsmessig ved temperatur over 600°C. Som forsøket har vist fjernes ved klorering<v>forurensninger som jern, titan etc. sterkt, således at de klorerte adsorbenter umiddelbart kan tilføres til elektrolysen. The experiment has shown that ■ the chlorination is carried out with chlorine gas and/or hydrogen chloride gas appropriately at a temperature above 600°C. As the experiment has shown, contamination such as iron, titanium etc. is strongly removed by chlorination, so that the chlorinated adsorbents can be immediately added to the electrolysis.
Endelig skal det nevnes at det ved forholdsreglen med pyrohydrolyse er mulig å redusere den effektive mengde av det til adsorpsjonen anvendte oksyd til en liten brøkdel, f.eks. 1- 2% av det for elektrolysen nødvendige oksyd. Finally, it should be mentioned that by the ratio of pyrohydrolysis it is possible to reduce the effective amount of the oxide used for adsorption to a small fraction, e.g. 1-2% of the oxide required for electrolysis.
Utførelseseksempler:Execution examples:
1. I en fast lagring ble det som adsorbens:- anvendte oksyd (50 g prøver) oppvarmet i luftstrøm (0,3 Nm^/luft/time) i nærvær av vanndamp (pyrohydrolyse). Betingelser '' , 1. In a fixed storage, the oxide used as adsorbent:- (50 g samples) was heated in a stream of air (0.3 Nm^/air/hour) in the presence of water vapor (pyrohydrolysis). Conditions '' ,
Bestemmelse av overflaten etter Brunauer-Emmet-Teller Determination of the surface according to Brunauer-Emmet-Teller
2. En fastlagring ble et som adsorbens anvendt oksyd behandlet med klorgass/luft, respektiv HCl/luft. Derved endret innholdet av forurensningen seg som følger: 2. A solid storage was an oxide used as an adsorbent treated with chlorine gas/air, respectively HCl/air. Thereby, the content of the pollution changed as follows:
■ Tilsvarende resultater oppnås ved opparbeidelse av oppladet natriumaluminat. ■ Corresponding results are obtained when processing charged sodium aluminate.
Claims (8)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19732346537 DE2346537A1 (en) | 1973-09-15 | 1973-09-15 | PROCESS FOR PROCESSING ALUMINUM OXIDE, SODIUM ALUMINATE AND / OR ALKALIZED ALUMINUM OXIDE USED TO SEPARATE FLUORINE COMPOUNDS FROM EXHAUST GASES |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NO742076L true NO742076L (en) | 1975-04-14 |
Family
ID=5892679
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO742076A NO742076L (en) | 1973-09-15 | 1974-06-07 |
Country Status (15)
| Country | Link |
|---|---|
| JP (1) | JPS5056388A (en) |
| AT (1) | AT334102B (en) |
| BE (1) | BE819762A (en) |
| BR (1) | BR7407091D0 (en) |
| CS (1) | CS179921B2 (en) |
| DE (1) | DE2346537A1 (en) |
| FR (1) | FR2243723A1 (en) |
| GB (1) | GB1479924A (en) |
| IN (1) | IN141991B (en) |
| IT (1) | IT1021221B (en) |
| NL (1) | NL7408920A (en) |
| NO (1) | NO742076L (en) |
| PL (1) | PL91714B1 (en) |
| RO (1) | RO67415A (en) |
| SE (1) | SE7411593L (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2928368A1 (en) | 1979-07-13 | 1981-02-05 | Metallgesellschaft Ag | METHOD FOR PRODUCING HYDROFLUORINE |
| DE2942439C2 (en) * | 1979-10-20 | 1981-10-15 | Vereinigte Aluminium-Werke Ag, 5300 Bonn | Process and device for the production of hydrogen fluoride from fluorine-containing materials by pyrohydrolysis |
-
1973
- 1973-09-15 DE DE19732346537 patent/DE2346537A1/en active Pending
-
1974
- 1974-04-19 IN IN896/CAL/74A patent/IN141991B/en unknown
- 1974-05-17 AT AT413374A patent/AT334102B/en not_active IP Right Cessation
- 1974-06-04 FR FR7419211A patent/FR2243723A1/fr not_active Withdrawn
- 1974-06-07 NO NO742076A patent/NO742076L/no unknown
- 1974-06-18 JP JP49069595A patent/JPS5056388A/ja active Pending
- 1974-07-02 NL NL7408920A patent/NL7408920A/en unknown
- 1974-07-22 CS CS7400005219A patent/CS179921B2/en unknown
- 1974-08-15 GB GB36035/74A patent/GB1479924A/en not_active Expired
- 1974-08-27 BR BR7091/74A patent/BR7407091D0/en unknown
- 1974-09-10 IT IT27105/74A patent/IT1021221B/en active
- 1974-09-10 BE BE6044743A patent/BE819762A/en unknown
- 1974-09-13 PL PL1974174096A patent/PL91714B1/xx unknown
- 1974-09-13 SE SE7411593A patent/SE7411593L/xx unknown
- 1974-09-13 RO RO7479985A patent/RO67415A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| BR7407091D0 (en) | 1975-07-29 |
| JPS5056388A (en) | 1975-05-17 |
| RO67415A (en) | 1979-08-15 |
| FR2243723A1 (en) | 1975-04-11 |
| AU6913874A (en) | 1975-11-20 |
| SE7411593L (en) | 1975-03-17 |
| ATA413374A (en) | 1976-04-15 |
| GB1479924A (en) | 1977-07-13 |
| IN141991B (en) | 1977-05-14 |
| PL91714B1 (en) | 1977-03-31 |
| NL7408920A (en) | 1975-03-18 |
| IT1021221B (en) | 1978-01-30 |
| BE819762A (en) | 1975-03-10 |
| CS179921B2 (en) | 1977-12-30 |
| DE2346537A1 (en) | 1975-04-24 |
| AT334102B (en) | 1976-12-27 |
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