NO164665B - PROCEDURE FOR RECOVERING ALUMINUM FROM WASTE MATERIAL. - Google Patents
PROCEDURE FOR RECOVERING ALUMINUM FROM WASTE MATERIAL. Download PDFInfo
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- NO164665B NO164665B NO852281A NO852281A NO164665B NO 164665 B NO164665 B NO 164665B NO 852281 A NO852281 A NO 852281A NO 852281 A NO852281 A NO 852281A NO 164665 B NO164665 B NO 164665B
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- Prior art keywords
- aluminum
- sulfuric acid
- scrap
- solution
- precipitation
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000002699 waste material Substances 0.000 title claims abstract description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 28
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 27
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 13
- 150000003839 salts Chemical class 0.000 claims abstract description 12
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000001556 precipitation Methods 0.000 claims abstract description 8
- 239000002002 slurry Substances 0.000 claims abstract description 5
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 9
- 239000000243 solution Substances 0.000 claims description 9
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 7
- 229910052749 magnesium Inorganic materials 0.000 claims description 7
- 239000011777 magnesium Substances 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 7
- 239000002253 acid Substances 0.000 claims description 5
- 238000003723 Smelting Methods 0.000 claims description 4
- 238000006386 neutralization reaction Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 150000007513 acids Chemical class 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 239000000725 suspension Substances 0.000 claims description 3
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 claims description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 2
- BUACSMWVFUNQET-UHFFFAOYSA-H dialuminum;trisulfate;hydrate Chemical compound O.[Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O BUACSMWVFUNQET-UHFFFAOYSA-H 0.000 claims description 2
- 239000012065 filter cake Substances 0.000 claims description 2
- 230000005283 ground state Effects 0.000 claims description 2
- 229910001425 magnesium ion Inorganic materials 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 238000004064 recycling Methods 0.000 claims description 2
- 239000012266 salt solution Substances 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims 2
- 230000002378 acidificating effect Effects 0.000 claims 1
- 235000017550 sodium carbonate Nutrition 0.000 claims 1
- 229910000029 sodium carbonate Inorganic materials 0.000 claims 1
- 229910021653 sulphate ion Inorganic materials 0.000 claims 1
- 239000000428 dust Substances 0.000 abstract description 10
- 238000001354 calcination Methods 0.000 abstract description 5
- 238000002425 crystallisation Methods 0.000 abstract description 4
- 230000008025 crystallization Effects 0.000 abstract description 4
- 238000001035 drying Methods 0.000 abstract description 3
- 238000002386 leaching Methods 0.000 abstract 1
- 238000005406 washing Methods 0.000 abstract 1
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 150000001247 metal acetylides Chemical class 0.000 description 3
- 150000004767 nitrides Chemical class 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010306 acid treatment Methods 0.000 description 2
- 150000003841 chloride salts Chemical class 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 2
- 235000019341 magnesium sulphate Nutrition 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- FIPWRIJSWJWJAI-UHFFFAOYSA-N Butyl carbitol 6-propylpiperonyl ether Chemical compound C1=C(CCC)C(COCCOCCOCCCC)=CC2=C1OCO2 FIPWRIJSWJWJAI-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- -1 aluminum silicates Chemical class 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 150000002681 magnesium compounds Chemical class 0.000 description 1
- 235000012245 magnesium oxide Nutrition 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical class [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 150000003377 silicon compounds Chemical class 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/40—Magnesium sulfates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/20—Preparation of aluminium oxide or hydroxide from aluminous ores using acids or salts
- C01F7/26—Preparation of aluminium oxide or hydroxide from aluminous ores using acids or salts with sulfuric acids or sulfates
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B21/00—Obtaining aluminium
- C22B21/0015—Obtaining aluminium by wet processes
- C22B21/0023—Obtaining aluminium by wet processes from waste materials
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/04—Working-up slag
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
- C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Metallurgy (AREA)
- Geology (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Geochemistry & Mineralogy (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
En fremgangsmåte for gjenvinning av aluminium fra aluminiumskrap og annet aluminiumhydroksydholdig avfall, særlig metallfattig avfallsstøv, qår ut på at fornyet innføring i elektrolysecellen gjøres mulig ved varmtvannutvaskina og etter-følgende surppslemning. I tillegg gjenvinnes ved saltut-felling (gjenværende rest av Al-utsmeltingen) fra filtratet av varmtvannsutvaskingen atter omsmeltesaltene ved krystallisering. Det oppløste aluminium ved svovelsyreoppslemningen gjenvinnes ved utfelling under tilsats av natronlut, og til-føres elektrolysecellen etter tørking og kalsinering.A method for recovering aluminum from aluminum scrap and other aluminum hydroxide-containing waste, in particular metal-poor waste dust, means that re-introduction into the electrolysis cell is made possible by the hot water washing machine and subsequent slurry slurrying. In addition, upon salt precipitation (remaining residue of the Al melt), the remelting salts are recovered again by crystallization from the hot water leaching by crystallization. The dissolved aluminum in the sulfuric acid slurry is recovered by precipitation with the addition of sodium hydroxide solution, and is fed to the electrolytic cell after drying and calcination.
Description
Foreliggende oppfinnelse angår en fremgangsmåte for kjemisk gjenvinning av aluminiumskrappulver ved innføring på nytt i en elektrolysecelle. The present invention relates to a method for the chemical recovery of aluminum scrap powder by reintroducing it into an electrolysis cell.
Vanligvis blir forekommende aluminiumskrap etter behandling i møller oppdelt i en grovkornet fraksjon, som har en høy aluminiumandel, samt metallfattig men oksydrik skrappulver. Den fraksjon som er rik på metallisk aluminium blandes med salter i smelteovner for utsmeltning av aluminiumet. Skrappulveret, som fremdeles inneholder betraktelige andeler av metallisk aluminium og aluminiumoksyd, kan imidlertid på grunn av sitt store innhold av forurensende substanser ikke tilføres elektrolysecellen uten kjemisk behandling. Generally, aluminum scrap that occurs after processing in mills is divided into a coarse-grained fraction, which has a high proportion of aluminium, as well as metal-poor but oxide-rich scrap powder. The fraction that is rich in metallic aluminum is mixed with salts in smelting furnaces to melt out the aluminum. The scrap powder, which still contains considerable proportions of metallic aluminum and aluminum oxide, however, due to its high content of polluting substances, cannot be supplied to the electrolysis cell without chemical treatment.
Det er kjent at karbider, nitrider og klorider kan fjernes ved behandling med varmt vann, hvorved karbider og nitrider under avspalting av metan eller ammoniakkgass går over i aluminiumhydroksyd. Kloridene av smeltesalttilsatsene oppløses og kan ved gjentatt inndampning og krystallisering tilbakeføres til smelteprosessen. Hittil frembragt skrapstøv inneholder imidlertid fremdeles, alt etter sin opprinnelse, magnesium i overveiende grad som oksyd, og som ville forstyrre smelteelektrolyseprosessen, særlig etterhvert som smeltens densitet øker, således at aluminium ikke lenger avsettes. Videre vil magnesium også delvis utskilles katodisk. It is known that carbides, nitrides and chlorides can be removed by treatment with hot water, whereby carbides and nitrides during the splitting off of methane or ammonia gas turn into aluminum hydroxide. The chlorides from the molten salt additives dissolve and can be returned to the smelting process by repeated evaporation and crystallization. However, scrap dust produced so far still contains, depending on its origin, magnesium predominantly as oxide, which would disturb the melt electrolysis process, especially as the density of the melt increases, so that aluminum is no longer deposited. Furthermore, magnesium will also be partially excreted cathodically.
Det er derfor et formål for oppfinnelsen å angi en fremgangsmåte av innledningsvis angitt art og hvorved de ovenfor omtalte ulemper kan overvinnes. It is therefore an object of the invention to specify a method of the kind indicated at the outset and by which the disadvantages mentioned above can be overcome.
Oppfinnelsen gjelder således fremgangsmåte for gjenvinning av aluminium fra skrap og annet aluminiumholdig avfall, hvor skrapet etter en nedbrytning til mindre bestanddeler, særlig oppmaling, deles opp i en grovfraksjon som fremdeles inneholder meget rent metall og som innsmeltes i saltbad i en smelteovn, og en finfraksjon som overveiende inneholder oksyd. The invention thus relates to a method for recycling aluminum from scrap and other aluminum-containing waste, where the scrap, after breaking it down into smaller components, in particular grinding, is divided into a coarse fraction which still contains very pure metal and which is melted in a salt bath in a smelting furnace, and a fine fraction which predominantly contains oxide.
Fremgangsmåtens særtrekk i henhold til oppfinnelsen ligger da i at den saltrike rest fra smelteovnen for grovfraksjonen etter skylling med varmt vann på kjent måte og filtrering for å adskille lakeaktig saltløsning og sammen med den utfiltrerte finfraksjon, atter filtreres under oppslemning i fortynnede syrer, særlig svovelsyre, hvoretter filterkaken i tørket og oppmalt tilstand tilføres en elektrolysecelle og den dannede løsning av aluminiumsulfat med innhold av metallisk aluminium nøytraliseres med natriumlut, således at aluminium utfelles i form av aluminiumhydroksyd, som tørkes, kalsineres og atter innføres i smelteelektrolysecellen. The distinguishing feature of the method according to the invention then lies in the fact that the salty residue from the melting furnace for the coarse fraction, after rinsing with hot water in a known manner and filtering to separate the brine-like salt solution and together with the filtered out fine fraction, is again filtered under suspension in dilute acids, especially sulfuric acid, after which the filter cake in a dried and ground state is fed to an electrolysis cell and the formed solution of aluminum sulphate containing metallic aluminum is neutralized with sodium hydroxide solution, so that aluminum is precipitated in the form of aluminum hydroxide, which is dried, calcined and reintroduced into the melting electrolysis cell.
For fjerning av magnesiumforbindelser og andre oksyder, såvel som også forskjellige aluminiumsilikater, utføres således i henhold til oppfinnelsen behandling med fortynnet svovelsyre. Herunder oppløses også en del av det metalliske aluminium, som imidlertid ved den etterfølgende påkrevede nøytralisasjon av det svovelsure behandlingsvann, atter kan gjenvinnes som hydroksyd. Etter filtrasjon og skylling av det behandlede skrapstøv tilføres dette elektrolysecellen etter kalsinering. For the removal of magnesium compounds and other oxides, as well as various aluminum silicates, treatment with dilute sulfuric acid is thus carried out according to the invention. Part of the metallic aluminum also dissolves here, which, however, can be recovered as hydroxide in the subsequent required neutralization of the sulfuric acid treatment water. After filtration and rinsing of the treated scrap dust, this is fed to the electrolysis cell after calcination.
Svovelsyrebehandlingsvannet innstilles med fortynnet lut under omrøring på en pH-verdi på 6 - 7 for å oppnå en adskil-lelse av aluminium og magnesium på grunn av pH-avhengigheten, således at aluminiumsulfatet utfelles som hydroksyd, mens magnesiumsulfatet fremdeles forblir i løsningen. Etter filtrering, skylling og kalsinering tilføres aluminiumoksydet smelteelektrolyseprosessen. Ved siden av magnesiumoksydene og foreliggende metallisk magnesium fremkommer ved oppslem-ningen i svovelsyre også andre metalliske oksyder, slik som ZnO, Fe203, CuO og TiC>2 ^ delvis oppløsning. The sulfuric acid treatment water is adjusted with diluted lye while stirring to a pH value of 6 - 7 to achieve a separation of aluminum and magnesium due to the pH dependence, so that the aluminum sulfate is precipitated as hydroxide, while the magnesium sulfate still remains in the solution. After filtering, rinsing and calcining, the aluminum oxide is fed to the melt electrolysis process. In addition to the magnesium oxides and the metallic magnesium present, the suspension in sulfuric acid also produces other metallic oxides, such as ZnO, Fe2O3, CuO and TiC>2 ^ partial solution.
Fra skrapstøvet fjernes ikke eventuelt forekommende silisium-forbindelser, slik som kvarts, mulitt eller spinell. Any silicon compounds, such as quartz, mullite or spinel, are not removed from the scrap dust.
Eksempel på et prosessforløp i henhold til foreliggende oppfinnelse er angitt på vedlagte skjematiske tegning og omfatter følgende prosesstrinn: An example of a process sequence according to the present invention is indicated on the attached schematic drawing and includes the following process steps:
1. Den metallfattige siktfraksjon av partikkelstørrelse < 1,0 mm kommer sammen med de bearbeidede smelte- og saltrester fra ovnen 2 for grovfraksjonen til reaksjonsbeholderen 1. 2. Behandling med varmt vann ved ca. 96°C finner sted med omtrent 5 ganger skrapstøwolumet i to trinn, for derved å oppnå utfelling av karbider og nitrider samt oppløsning av saltene fra smelteovnen 2. 3. Filtrering gjennom vakuumfilter 3 til en saltlake-beholder 4 for gjenvinning av omsmeltesaltene ved inndampning og krystallisering. 4. Tilbakeføring av det utvaskede skrapstøv i reaksjonsbeholderen 1 og behandling med 10 %ig varm svovelsyre ved ca. 90°C (2 liter 10 %ig H2S04 til 1 kg skrapstøv). 5. Filtrering gjennom vakuumfilter 3 til en mellombeholder 1. The metal-poor sieve fraction of particle size < 1.0 mm comes together with the processed melt and salt residues from the furnace 2 for the coarse fraction to the reaction vessel 1. 2. Treatment with hot water at approx. 96°C takes place with approximately 5 times the scrap dust volume in two stages, thereby achieving precipitation of carbides and nitrides as well as dissolution of the salts from the melting furnace 2. 3. Filtration through vacuum filter 3 to a brine container 4 for recovery of the remelt salts by evaporation and crystallization. 4. Return of the washed scrap dust into the reaction container 1 and treatment with 10% hot sulfuric acid at approx. 90°C (2 liters of 10% H2S04 to 1 kg scrap dust). 5. Filtration through vacuum filter 3 into an intermediate container
6 samt avskylling inntil syrefrihet oppnås. 6 and rinsing until freedom from acid is achieved.
6. Tørking og kalsinering 7 av det behandlede skrapstøv ved 500°C. Delvis innføring i elektrolysecellen 8. 7. Tilbakeføring av det svovelsyrefiltrat fra mellom beholderen 6 til reaksjonsbeholderen 1. Langsom tilførsel av kald 10 %ig natronlut 9 under omrøring inntil en pH verdi på 6 - 7 er oppnådd, for derved å frembringe utfelling av aluminiumhydroksyd og nøytrali-sering for fjerning av avløpsvannet. Magnesiumsulfat forblir herunder fremdeles i løsning. 8. Filtrering av aluminiumhydroksydet gjennom vakuumfilter 3 til mellombeholderen 6 for fjerning av avløpsvann. 6. Drying and calcination 7 of the treated scrap dust at 500°C. Partial introduction into the electrolysis cell 8. 7. Return of the sulfuric acid filtrate from between the container 6 to the reaction container 1. Slow supply of cold 10% caustic soda 9 with stirring until a pH value of 6 - 7 is achieved, thereby producing precipitation of aluminum hydroxide and neutralization to remove the waste water. Magnesium sulfate still remains in solution below. 8. Filtration of the aluminum hydroxide through vacuum filter 3 to the intermediate container 6 for the removal of waste water.
Etter tørking og kalsinering 7 av det utvaskede aluminiumhydroksyd innføres dette i elektrolysecellen 8. Ut i fra dette finner det således sted en oppdeling av aluminiumskrapet etter oppmalingen i en fraksjon rik på metallisk aluminium, fortrinnsvis i en kornstørrelse < 1 mm for gjentatt nedsmelting under tilssats av omsmeltesalter, og metallfattig skrapstøv med kornstørrelse < 1 mm. Frem-gangsmåten i henhold til oppfinnelsen går videre ut på gjeninnsetning av skrapstøv sammen med de saltrike rester fra smelteovnene under samtidig tilbakevinning av omsmeltesaltene. After drying and calcining 7 of the washed out aluminum hydroxide, this is introduced into the electrolysis cell 8. Based on this, a division of the aluminum scrap after grinding into a fraction rich in metallic aluminum, preferably in a grain size < 1 mm, takes place for repeated melting down with the addition of remelting salts, and metal-poor scrap dust with a grain size < 1 mm. The method according to the invention further involves the reintroduction of scrap dust together with the salt-rich residues from the melting furnaces while simultaneously recovering the remelting salts.
Videre finner ny innføring i elektrolysecellen sted ved oppslemning ved fortynnede syrer, for derved å oppnå fjerning av magnesium, særlig fra legeringsskrap. Herunder oppløses imidlertid også andre forurensende oksyder, fremfor alt oksyder av sink, kobber, kalsium, jern og titan i stor utstrekning. Furthermore, new introduction into the electrolysis cell takes place by slurrying with dilute acids, thereby achieving the removal of magnesium, particularly from alloy scrap. However, other polluting oxides also dissolve below, above all oxides of zinc, copper, calcium, iron and titanium to a large extent.
En sur oppslemning utføres fortrinnsvis med 1 - 90 % svovelsyre, helst 10 %ig varm svovelsyre. An acid slurry is preferably carried out with 1 - 90% sulfuric acid, preferably 10% hot sulfuric acid.
Gjenvinning av det oppløste metalliske aluminium ved den svovelsure oppslemning finner fortrinnsvis sted ved den påkrevede nøytralisering for fjerning av behandlingsvannet under tilsats av 1 - 50 % lut, fortrinnsvis 5 %ig kald natronlut. Recovery of the dissolved metallic aluminum in the sulfuric acid slurry preferably takes place during the required neutralization to remove the treatment water with the addition of 1 - 50% lye, preferably 5% cold caustic soda.
Til slutt fraskilles magnesiumioner ved utfelling av aluminiumhydroksyd ved innstilling av pH-området på 3 - 11, fortrinnsvis 6-7, under langsom tilsetning av 5 %ig kald natronlut under omrøring, hvorved en kvantitativ utfelling av aluminiumhydroksyd oppnås, samtidig som magnesium forblir i løsning i form av sulfat. Finally, magnesium ions are separated by precipitation of aluminum hydroxide by setting the pH range to 3 - 11, preferably 6-7, during the slow addition of 5% cold caustic soda with stirring, whereby a quantitative precipitation of aluminum hydroxide is achieved, while magnesium remains in solution in the form of sulfate.
Claims (5)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT189584A AT383105B (en) | 1984-06-08 | 1984-06-08 | METHOD FOR RECOVERY OF ALUMINUM FROM SCRATCHES |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| NO852281L NO852281L (en) | 1985-12-09 |
| NO164665B true NO164665B (en) | 1990-07-23 |
| NO164665C NO164665C (en) | 1990-10-31 |
Family
ID=3523340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO852281A NO164665C (en) | 1984-06-08 | 1985-06-06 | PROCEDURE FOR RECOVERING ALUMINUM FROM WASTE MATERIAL. |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0167789B1 (en) |
| AT (1) | AT383105B (en) |
| DE (1) | DE3567913D1 (en) |
| NO (1) | NO164665C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108396150A (en) * | 2018-01-29 | 2018-08-14 | 环境保护部华南环境科学研究所 | A kind of secondary recovery product line device of aluminium lime-ash |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT390965B (en) * | 1988-02-17 | 1990-07-25 | Austria Metall | TREATMENT AND DISPOSAL OF SCRATCHES, SALT SLAG AND ALUMINUM-BASED WASTE |
| CH685562A5 (en) * | 1992-03-17 | 1995-08-15 | Alusuisse Lonza Services Ag | Use of mixt. of combustible material and aluminium or alloy in metal mfr. |
| DE4425424C1 (en) * | 1994-07-19 | 1996-02-22 | Harzer Dolomitwerke Gmbh | Process for processing slag or dross from magnesium production |
| US6110434A (en) * | 1998-02-25 | 2000-08-29 | Alumitech Of Cleveland, Inc. | Recovery of products from non-metallic products derived from aluminum dross |
| EP3825426A1 (en) * | 2019-11-22 | 2021-05-26 | Befesa Aluminio, S.L. | Process for transforming secondary aluminium oxide into alternative raw material and uses thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE887270C (en) * | 1944-02-22 | 1953-08-20 | Vaw Ver Aluminium Werke Ag | Process for the recovery of the metal from light metal scrapers |
-
1984
- 1984-06-08 AT AT189584A patent/AT383105B/en not_active IP Right Cessation
-
1985
- 1985-05-31 DE DE8585106730T patent/DE3567913D1/en not_active Expired
- 1985-05-31 EP EP85106730A patent/EP0167789B1/en not_active Expired
- 1985-06-06 NO NO852281A patent/NO164665C/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108396150A (en) * | 2018-01-29 | 2018-08-14 | 环境保护部华南环境科学研究所 | A kind of secondary recovery product line device of aluminium lime-ash |
Also Published As
| Publication number | Publication date |
|---|---|
| AT383105B (en) | 1987-05-25 |
| DE3567913D1 (en) | 1989-03-02 |
| NO852281L (en) | 1985-12-09 |
| EP0167789A1 (en) | 1986-01-15 |
| NO164665C (en) | 1990-10-31 |
| ATA189584A (en) | 1986-10-15 |
| EP0167789B1 (en) | 1989-01-25 |
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