NO319478B1 - Method and apparatus for adding powder to a metal melt - Google Patents
Method and apparatus for adding powder to a metal melt Download PDFInfo
- Publication number
- NO319478B1 NO319478B1 NO20043941A NO20043941A NO319478B1 NO 319478 B1 NO319478 B1 NO 319478B1 NO 20043941 A NO20043941 A NO 20043941A NO 20043941 A NO20043941 A NO 20043941A NO 319478 B1 NO319478 B1 NO 319478B1
- Authority
- NO
- Norway
- Prior art keywords
- melt
- powder
- accordance
- reaction chamber
- closed container
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000000843 powder Substances 0.000 title claims abstract description 17
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 15
- 239000002184 metal Substances 0.000 title claims abstract description 15
- 239000000155 melt Substances 0.000 claims abstract description 21
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims description 19
- 229910052782 aluminium Inorganic materials 0.000 claims description 16
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 16
- 239000007789 gas Substances 0.000 claims description 14
- 239000011261 inert gas Substances 0.000 claims description 3
- 239000003380 propellant Substances 0.000 claims 1
- 239000011734 sodium Substances 0.000 description 14
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminium flouride Chemical compound F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 description 10
- 101100004392 Arabidopsis thaliana BHLH147 gene Proteins 0.000 description 10
- 239000002245 particle Substances 0.000 description 9
- 239000004411 aluminium Substances 0.000 description 5
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 239000000460 chlorine Substances 0.000 description 4
- 229910052801 chlorine Inorganic materials 0.000 description 4
- 150000002739 metals Chemical class 0.000 description 4
- 238000005868 electrolysis reaction Methods 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 229910001610 cryolite Inorganic materials 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
Fremgangsmåte og anordning for å fjerne alkalier som Na, K og Ca fra lettmetallsmelter gjennom tilsetning av AIFpulver. Pulveret tilsettes smelta i en lukket beholder (7) i fravær av luft, idet pulveret tilføres smelta via et tettsluttende rør (4) som munner ut i et spredemunnstykke (3) for pulveret.Method and device for removing alkalis such as Na, K and Ca from light metal melts by adding AIF powder. The powder is added to the melt in a closed container (7) in the absence of air, the powder being supplied to the melt via a tight-fitting tube (4) which opens into a spreading nozzle (3) for the powder.
Description
Foreliggende oppfinnelse vedrører en fremgangsmåte for fjerning av alkalier fra ei lettmetallmelte som angitt i innledningen til patentkrav 1. Oppfinnelsen omfatter også en anordning for gjennomføring av fremgangsmåten, som angitt i innledningen til patentkrav 5. The present invention relates to a method for removing alkalis from a light metal melt as stated in the introduction to patent claim 1. The invention also includes a device for carrying out the method, as stated in the introduction to patent claim 5.
Bakgrunn Background
Ved primær produksjon av aluminium vil det, når aluminium taes ut av elektrolysecellen, innholde ca 100 ppm Na, pluss andre alkalier. Krav til utstøpt metall er som regel <20 ppm Na, i enkelte tilfeller < 5 ppm. In primary production of aluminium, when aluminum is taken out of the electrolysis cell, it will contain approx. 100 ppm Na, plus other alkalis. Requirements for cast metal are usually <20 ppm Na, in some cases <5 ppm.
Oet er kjent fra markedet og litteraturen at det oppnås god fjerning av Na fra aluminiumsmelte ved: It is known from the market and the literature that good removal of Na from aluminum melt is achieved by:
- Bruk av Cl2(g) hvor det dannes NaCl [Na + ' Å Cl2(g) = NaCl]. - Use of Cl2(g) where NaCl is formed [Na + ' Å Cl2(g) = NaCl].
Dette er en effektiv metode, men bruk av klor er ikke tilrådelig når man tenker på farene som er forbundet med klor samt korrosjon problemer som kan oppstå i et støperi. Men klor benyttes for komme ned mot 1 ppm Na. This is an effective method, but the use of chlorine is not advisable when you think about the dangers associated with chlorine as well as corrosion problems that can occur in a foundry. But chlorine is used to get down to 1 ppm Na.
- Tilsats av AIF3 pulver til aluminiumsmelte, hvor det dannes NaF eller NajAIF6- Addition of AIF3 powder to aluminum melt, where NaF or NajAIF6 is formed
på overflata til A1F3 partiklene. on the surface of the A1F3 particles.
Fra litteraturen er det kjent at TAC prosessen benytter A1F3 til fjerning av Li og Na med mer fra aluminium (Ghyslain Dubé and V.J. Newberry: TAC- A novel process for removal of lithium and other alkalis in primary aluminium. TMS Light Metals 1983, pp 991 - 1003). I Norge er RAM prosessen (Bjørn Rasch, Erling Myrbostad and Kjell Hafsås: Refining of potroom metall using THE HYDRO RAM CRUCIBLE FLUXING PROCESS. TMS Light Metals 1998, pp 851 - 854) utviklet av Hydro Aluminium og tatt i bruk ved Sunndal Verk og Høyanger Verk. It is known from the literature that the TAC process uses A1F3 to remove Li and Na and more from aluminum (Ghyslain Dubé and V.J. Newberry: TAC- A novel process for removal of lithium and other alkalis in primary aluminium. TMS Light Metals 1983, pp 991 - 1003). In Norway, the RAM process (Bjørn Rasch, Erling Myrbostad and Kjell Hafsås: Refining of potroom metal using THE HYDRO RAM CRUCIBLE FLUXING PROCESS. TMS Light Metals 1998, pp 851 - 854) was developed by Hydro Aluminum and put into use at Sunndal Verk and Høyanger Work.
Både TAC- og RAM-prosessen eksponerer overflata av aluminiumsmelta mot luft, noe som gir oksidasjon av metallet. Varmetapet under behandlingen er også stort. Both the TAC and RAM processes expose the surface of the aluminum melt to air, which results in oxidation of the metal. The heat loss during treatment is also large.
Formål Purpose
Hovedmålet med oppfinnelsen er å redusere eller fjerne disse ulempene og komme frem til en anordning som er gunstig med hensyn til miljøvennlighet, bygging, drift og vedlikehold. Det er et særlig formål å komme frem til en anordning som forhindrer oksidering av smelta og redusere varmetapet, samt gjenvinner avgangsproduktene på en enkel måte. The main aim of the invention is to reduce or remove these disadvantages and arrive at a device which is favorable with regard to environmental friendliness, construction, operation and maintenance. It is a particular aim to arrive at a device that prevents oxidation of the melt and reduces heat loss, as well as recovers the waste products in a simple way.
Oppfinnelsen The invention
I henhold til et første aspekt angår oppfinnelsen en fremgangsmåte som angitt i patentkrav 1.1 henhold til ett ytterligere aspekt angår oppfinnelsen en anordning som angitt i patentkrav S. Foretrukne utførelsesformer av oppfinnelsen'fremgår av de uselvstandige patentkrav. According to a first aspect, the invention relates to a method as stated in patent claim 1.1 according to a further aspect, the invention relates to a device as stated in patent claim S. Preferred embodiments of the invention appear from the independent patent claims.
Denne oppfinnelsen virker ved at over en digel som inneholder aluminiumsmelte, anordnes et lokk som er forsynt med et reaksjonskammer hvor smelta behandles med AIF3 pulver tilføres uten at luft kommer inn i reaksjonskammeret.. This invention works by placing a lid over a crucible containing aluminum melt, which is equipped with a reaction chamber where the melt is treated with AIF3 powder and added without air entering the reaction chamber.
Smelta kan bringes opp i reaksjonskammeret ved prinsippelt to forskjellige måter: The melt can be brought up into the reaction chamber in two different ways in principle:
1) Smelta suges opp, fra en digel som inneholder ei aluminiumsmelte, inn et reaksjonskammer ved hjelp av en ejektor som danner et undertrykk i reaksjonskammeret. 2) En gass, argon eller nitrogen, tilføres en tett digel som inneholder en smelte av aluminium. Gasstrykket reguleres slik at smelta presses opp i reaksjonskammeret. 1) The melt is sucked up, from a crucible containing an aluminum melt, into a reaction chamber by means of an ejector which creates a negative pressure in the reaction chamber. 2) A gas, argon or nitrogen, is supplied to a sealed crucible containing a melt of aluminium. The gas pressure is regulated so that the melt is forced up into the reaction chamber.
Eksempel Example
Oppfinnelsen beskrives nærmere i det etterfølgende med hjelp av figuren som viser ei prinsippskisse, The invention is described in more detail below with the help of the figure which shows a principle sketch,
Når smelta inne i reaksjonskammeret 1 har nådd riktig nivå 2, blir AIF3 pulver pluss en inert gass (f eks Ar eller N2) tilsatt via en rotor 3. Når rotoren tilføres gass, som sammen med AIF3 - partiklene, via et rør 4 som har utløp inni rotoren 3, strømmer den ut i smelta og stiger mot overflaten, hvilket bevirker at smelte også går oppover. Men samme mengde smelte strømmer nedover gjennom en kanal 5 som også virker som en strømningsbryter inne i reaksjonskammeret 1. Dette betyr at smelta som befinner seg i digelen blir behandlet flere ganger. Reaktorkammeret 1 er montert på et digellokket 6 som står oppå en digel 7. Smelta kommer inn i reaktorkammeret 1, enten ved at et gasstrykk fra gassrøret 8 presser smelteoverflatens nivå 9 inne i digelen ned, eller at en ejektor 10 danner et undertrykk over nivå 2. Ejektoren 10 sørger for at gasspartikler som kommer inn i rotoren 3 og passerer overflata ved nivå 2, suges ut og inn i en syklon 11 hvor partiklene skilles ut og avgassen slippes ut, enten til atmosfæren eller til et sentralt gassrenseanlegg. Rotoren 3 blir drevet av motoren 12. Tilførselsrøret 4, som går gjennom motoren 12 og ned til rotoren 3, far tilført gass ved 13 og AIF3 partikler mates inn fra siloen 14 ved hjelp av en skruemater 15 inn i røret 4. Rotoren 3 koblet til motoren 12 ved hjelp av akslingen 16. Akslingen 16 går gjennom en pakning When the melt inside the reaction chamber 1 has reached the correct level 2, AIF3 powder plus an inert gas (e.g. Ar or N2) is added via a rotor 3. When the rotor is supplied with gas, which together with the AIF3 particles, via a pipe 4 which has outlet inside the rotor 3, it flows out into the melt and rises towards the surface, causing the melt to also rise. But the same amount of melt flows downwards through a channel 5 which also acts as a flow switch inside the reaction chamber 1. This means that the melt in the crucible is treated several times. The reactor chamber 1 is mounted on a crucible lid 6 which stands on top of a crucible 7. The melt enters the reactor chamber 1, either by a gas pressure from the gas pipe 8 pushing down the melting surface level 9 inside the crucible, or by an ejector 10 creating a negative pressure above level 2 The ejector 10 ensures that gas particles that enter the rotor 3 and pass the surface at level 2 are sucked out and into a cyclone 11 where the particles are separated and the exhaust gas is released, either to the atmosphere or to a central gas purification plant. The rotor 3 is driven by the motor 12. The supply pipe 4, which runs through the motor 12 and down to the rotor 3, where gas is supplied at 13 and AIF3 particles are fed in from the silo 14 by means of a screw feeder 15 into the pipe 4. The rotor 3 connected to the motor 12 by means of the shaft 16. The shaft 16 passes through a gasket
17 som sørger for at gasslekkasjer unngås. 17 which ensures that gas leaks are avoided.
Som tidligere nevnt foregår følgende reaksjon: As previously mentioned, the following reaction takes place:
Som kjent ved aluminiumfremstilling, tilsettes AIF3 til elektrolysebadet for holde ønsket surhetsgrad i badet. Ved å benytte A1F3 til å fjerne Na fra aluminiumsmelta, som er tatt ut av cellen, kan Na returneres sammen med AIF3 tilbake til elektrolysecellen. As is known in aluminum production, AIF3 is added to the electrolysis bath to maintain the desired acidity in the bath. By using A1F3 to remove Na from the aluminum melt, which has been taken out of the cell, Na can be returned together with AIF3 back to the electrolysis cell.
Grunnen til at AIF3(s) er så effektiv, er at reaksjonen foregår kun på overflata av A1F3 - partikkelen. Det benyttes ca 2 kg AIF3 per tonn smelte for å fjerne ca 100 g løst Na. Ved å benytte en apparatur, hvor prinsippet er vist på figuren, kan man lett samle opp AIF3 partiklene i en syklon. Det dannede Na3AlF6 legger seg på overflata av A1F3 - partikkelen. The reason why AIF3(s) is so effective is that the reaction takes place only on the surface of the A1F3 particle. About 2 kg of AIF3 per tonne of melt is used to remove about 100 g of dissolved Na. By using an apparatus, the principle of which is shown in the figure, you can easily collect the AIF3 particles in a cyclone. The formed Na3AlF6 settles on the surface of the A1F3 particle.
Rotoren 3 som tenkes anvendt er beskrevet i norsk patentskrift 307289. The rotor 3 which is thought to be used is described in Norwegian patent document 307289.
I reaksjonskammeret kan, om ønskelig, aktive gasser, f eks klor, ledes til smelta gjennom rotoren uten lekkasje til omgivelsene. In the reaction chamber, if desired, active gases, eg chlorine, can be led to the melt through the rotor without leaking to the surroundings.
Fordelene med den oppfinnelsen er i forhold til de apparaturer som er gitt i Ghyslain Dubé and V.J. Newberry: TAC- A novel process for removal of lithium and other alkalis in primary aluminium. TMS Light Metals 1983, pp 991 - 1003 og Bjørn Rasch, Erling Myrbostad and Kjell Hafsås: Refining of potroom metal usingTHE HYDRO RAM CRUCIBLE FLUXING PROCESS. TMS Light Metals 1998, pp 851 - 854 er: Reaksjonen foregår uten at oksidering av aluminium, på grunn av at luft ikke kommer inn i reaksjonskammeret. The advantages of that invention are compared to the apparatus given in Ghyslain Dubé and V.J. Newberry: TAC- A novel process for removal of lithium and other alkalis in primary aluminium. TMS Light Metals 1983, pp 991 - 1003 and Bjørn Rasch, Erling Myrbostad and Kjell Hafsås: Refining of potroom metal using THE HYDRO RAM CRUCIBLE FLUXING PROCESS. TMS Light Metals 1998, pp 851 - 854 is: The reaction takes place without oxidation of aluminium, due to the fact that air does not enter the reaction chamber.
Reaksjonskammeret kan enkelt varmeisoleres. The reaction chamber can easily be thermally insulated.
Retur av A1F3- partikler fra reaksjonskammeret samles enkelt opp i syklonen. Metoden er velegnet, også om det er lite metall i transportdigelen. Return of A1F3 particles from the reaction chamber is easily collected in the cyclone. The method is suitable, even if there is little metal in the transport crucible.
Ved å bruke rotoren som er beskrevet i norsk patentskrift 307 289 oppnås meget turbulente forhold i reaktorkammeret samtidig som smelteoverflata i transportdigelen vil være i ro. Prosessen er miljøvennlig, på grunn av at den er lukket. Avgassen kan enkelt knyttes til eksisterende renseanlegg. By using the rotor described in Norwegian patent document 307 289, very turbulent conditions are achieved in the reactor chamber at the same time that the melt surface in the transport crucible will be at rest. The process is environmentally friendly, due to the fact that it is closed. The exhaust gas can easily be connected to existing treatment plants.
Ettersom trykket over smeltenivået i reaktorkammeret er vesentlig lavere enn atmosfære-trykket, samtidig som det er høg turbulens, vil mye natrium forsvinne sammen med avgassen. Reaksjonen som skjer er: Na = Na(g), (Na = natrium løst i smelte). As the pressure above the melting level in the reactor chamber is significantly lower than the atmospheric pressure, while there is high turbulence, a lot of sodium will disappear together with the exhaust gas. The reaction that takes place is: Na = Na(g), (Na = sodium dissolved in melt).
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO20043941A NO20043941A (en) | 2004-09-21 | 2004-09-21 | Method and device for adding powder to a metal melt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO20043941A NO20043941A (en) | 2004-09-21 | 2004-09-21 | Method and device for adding powder to a metal melt |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| NO20043941D0 NO20043941D0 (en) | 2004-09-21 |
| NO319478B1 true NO319478B1 (en) | 2005-08-15 |
| NO20043941A NO20043941A (en) | 2005-08-15 |
Family
ID=35057626
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO20043941A NO20043941A (en) | 2004-09-21 | 2004-09-21 | Method and device for adding powder to a metal melt |
Country Status (1)
| Country | Link |
|---|---|
| NO (1) | NO20043941A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008010721A1 (en) * | 2006-07-04 | 2008-01-24 | Heggset Teknologi As | A method and device for admixture of powder in a liquid |
| WO2011021940A1 (en) * | 2009-08-21 | 2011-02-24 | Sør Norge Aluminium As | Method and apparatus for adding powder and gas in a melt |
| NO20150703A1 (en) * | 2015-06-01 | 2016-12-02 | Hmr Hydeq As | A molten metal and powder adding and mixing system and a system for the production of metal |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO176553C (en) * | 1993-04-14 | 1995-04-26 | Norsk Hydro As | injection equipment |
-
2004
- 2004-09-21 NO NO20043941A patent/NO20043941A/en not_active IP Right Cessation
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008010721A1 (en) * | 2006-07-04 | 2008-01-24 | Heggset Teknologi As | A method and device for admixture of powder in a liquid |
| AU2007275955B2 (en) * | 2006-07-04 | 2011-06-16 | Heggset Teknologi As | A method and device for admixture of powder in a liquid |
| AU2007275955B8 (en) * | 2006-07-04 | 2011-08-11 | Heggset Teknologi As | A method and device for admixture of powder in a liquid |
| AU2007275955A8 (en) * | 2006-07-04 | 2011-08-11 | Heggset Teknologi As | A method and device for admixture of powder in a liquid |
| WO2011021940A1 (en) * | 2009-08-21 | 2011-02-24 | Sør Norge Aluminium As | Method and apparatus for adding powder and gas in a melt |
| NO20150703A1 (en) * | 2015-06-01 | 2016-12-02 | Hmr Hydeq As | A molten metal and powder adding and mixing system and a system for the production of metal |
| NO342536B1 (en) * | 2015-06-01 | 2018-06-11 | Hmr Hydeq As | A molten metal and powder adding and mixing system and a system for the production of metal |
Also Published As
| Publication number | Publication date |
|---|---|
| NO20043941D0 (en) | 2004-09-21 |
| NO20043941A (en) | 2005-08-15 |
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