NO341751B1 - Method and device for recycling of dust accumulations in connection with electrolytic production of aluminium - Google Patents
Method and device for recycling of dust accumulations in connection with electrolytic production of aluminium Download PDFInfo
- Publication number
- NO341751B1 NO341751B1 NO20160985A NO20160985A NO341751B1 NO 341751 B1 NO341751 B1 NO 341751B1 NO 20160985 A NO20160985 A NO 20160985A NO 20160985 A NO20160985 A NO 20160985A NO 341751 B1 NO341751 B1 NO 341751B1
- Authority
- NO
- Norway
- Prior art keywords
- pot
- size fraction
- basement
- alumina
- cryolite
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 43
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 22
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 239000004411 aluminium Substances 0.000 title claims description 20
- 239000000428 dust Substances 0.000 title description 24
- 238000004064 recycling Methods 0.000 title description 5
- 230000035508 accumulation Effects 0.000 title description 2
- 238000009825 accumulation Methods 0.000 title description 2
- 239000000463 material Substances 0.000 claims abstract description 107
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 63
- 229910001610 cryolite Inorganic materials 0.000 claims abstract description 28
- 239000002245 particle Substances 0.000 claims abstract description 10
- 238000012216 screening Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 description 19
- 238000005868 electrolysis reaction Methods 0.000 description 11
- 238000011084 recovery Methods 0.000 description 10
- 239000000203 mixture Substances 0.000 description 7
- 239000002994 raw material Substances 0.000 description 6
- 241000196324 Embryophyta Species 0.000 description 5
- 238000007873 sieving Methods 0.000 description 5
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminium flouride Chemical compound F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 description 4
- 238000010410 dusting Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000012432 intermediate storage Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000004131 Bayer process Methods 0.000 description 1
- 241000190022 Pilea cadierei Species 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 150000002222 fluorine compounds Chemical class 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000010169 landfilling Methods 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- C25C3/08—Cell construction, e.g. bottoms, walls, cathodes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
- B07B13/04—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices according to size
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electrolytic Production Of Metals (AREA)
Abstract
Present invention relates to a method for recovering fines in a pot line for aluminium production, wherein the finely divided material comprises aluminaand cryolite, wherein the pot line comprising electrolytic cells (6), and wherein the method com prising a step A1, wherein the step A1 comprises separating (9) the fines in least a first (11) and at least a second (10) size fraction, and wherein the at least first size fraction (11) comprises particles with substantially smaller particle size than the at least second size fraction (10), c h a r a c t e r i s e d in that step A1 involves a concentration of alumina in the least first (11) size fraction and a concentration of the cryolite in the at least second (10) size fraction, and the method further comprises a step B1, wherein step B1 includes to repatriate (13) the at least first size fraction (11) from step A1 to the pot lines electrolytic cells (6) and a further step B2, wherein step B2 comprises to repatriate the at least second size fraction (10) in the pot lines supply system for covering materials (ACM)/cryolite.
Claims (7)
1. Fremgangsmåte for å gjenvinne finpartikler i en elektrolyseanlegg for aluminiumsproduksjon, hvor det finfordelte materialet innbefatter aluminium og kryolitt, hvor elektrolyseanlegget innbefatter elektrolyseceller (6) og hvor fremgangsmåten innbefatter et trinn A1, hvor trinnet A1 innbefatter separasjon (9) av finpartiklene i minst en første (11) og en andre (10) størrelsesfraksjon, og hvor minst den første størrelsesfraksjonen (11) innbefatter partikler med i det vesentligste mindre partikkelstørrelse enn den minst andre størrelsesfraksjonen (10), k a r a k t e r i s e r t v e d at trinn A1 innbefatter en oppkonsentrering av alumina i den minst første (11) størrelsesfraksjonen og en oppkonsentrering av kryolitt i den minst andre (10) størrelsesfraksjonen, og fremgangsmåten videre innbefatter et trinn B1, hvor trinn B1 innbefatter tilbakeføring (13) av den minst første størrelsesfraksjonen (11) fra trinn A1 til elektrolyseanleggets elektrolyseceller (6) og et ytterligere trinn B2, hvor trinn B2 innbefatter tilbakeføring av den mist andre størrelsesfraksjonen (10) i elektrolyseanleggets tilførselssystem for dekkematerialer (ACM)/kryolitt.
2. Fremgangsmåte i henhold til krav 1, hvor den minst ene størrelsesfraksjonen (11) innbefatter et finoppdelt materiale (7) med en partikkelstørrelse mindre enn 1 mm, mer foretrukket mindre enn 0,5 mm og mest foretrukket mindre enn 0,2 mm.
3. Fremgangsmåte i henhold til krav 3, hvor fremgangsmåten innbefatter et trinn A0 før trinn A1, hvor trinn A0 innbefatter grovsikting av det finoppdelte materialet (7).
4. Fremgangsmåte i henhold til krav 3, hvor trinn A0 innbefatter grovsikting av det finfordelte materialet (7) med en sikt med en maskevidde på mindre enn 100 mm, mer foretrukket mindre enn 70 mm og mest foretrukket mindre enn 40 mm.
5. Fremgangsmåte i henhold til krav 1, hvor trinnet B1 innbefatter tilbakeføring av i det minste den første størrelsesfraksjonen (11) til elektrolyseanleggets elektrolyseceller i en masseprosent på mindre eller lik 100 % av den totale tilførselen til elektrolyseanleggets elektrolyseceller, fortrinnsvis mindre enn 50 % og mest foretrukket mindre enn 2 %.
6. Fremgangsmåte i henhold til hvilke som helst av de foregående krav, hvor det finfordelte materialet (7) innbefatter kjellerstoff.
7. Fremgangsmåte i henhold til hvilke som helst av de foregående krav, hvor det finfordelte materialet (7) innbefatter finfordelt materiale fra dekkematerialer (ACM).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO20160985A NO341751B1 (en) | 2016-06-09 | 2016-06-09 | Method and device for recycling of dust accumulations in connection with electrolytic production of aluminium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO20160985A NO341751B1 (en) | 2016-06-09 | 2016-06-09 | Method and device for recycling of dust accumulations in connection with electrolytic production of aluminium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NO20160985A1 NO20160985A1 (en) | 2017-12-11 |
| NO341751B1 true NO341751B1 (en) | 2018-01-15 |
Family
ID=60804795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO20160985A NO341751B1 (en) | 2016-06-09 | 2016-06-09 | Method and device for recycling of dust accumulations in connection with electrolytic production of aluminium |
Country Status (1)
| Country | Link |
|---|---|
| NO (1) | NO341751B1 (no) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3077266A (en) * | 1961-03-10 | 1963-02-12 | Iowa Mfg Company | Split deck vibrating screen |
| US3635408A (en) * | 1970-08-25 | 1972-01-18 | Alcan Res & Dev | Treatment of carbon lining from reduction cells |
| US4113832A (en) * | 1977-11-28 | 1978-09-12 | Kaiser Aluminum & Chemical Corporation | Process for the utilization of waste materials from electrolytic aluminum reduction systems |
| GB2067596A (en) * | 1980-01-19 | 1981-07-30 | Vaw Ver Aluminium Werke Ag | Process and apparatus for the separation and re-use of dust material from the effluent gases of aluminium fusion electrolysis furnaces |
| CN103088365A (zh) * | 2013-02-01 | 2013-05-08 | 贵阳冶金机电工艺有限公司 | 一种电解铝清洁生产工艺 |
-
2016
- 2016-06-09 NO NO20160985A patent/NO341751B1/en not_active IP Right Cessation
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3077266A (en) * | 1961-03-10 | 1963-02-12 | Iowa Mfg Company | Split deck vibrating screen |
| US3635408A (en) * | 1970-08-25 | 1972-01-18 | Alcan Res & Dev | Treatment of carbon lining from reduction cells |
| US4113832A (en) * | 1977-11-28 | 1978-09-12 | Kaiser Aluminum & Chemical Corporation | Process for the utilization of waste materials from electrolytic aluminum reduction systems |
| GB2067596A (en) * | 1980-01-19 | 1981-07-30 | Vaw Ver Aluminium Werke Ag | Process and apparatus for the separation and re-use of dust material from the effluent gases of aluminium fusion electrolysis furnaces |
| CN103088365A (zh) * | 2013-02-01 | 2013-05-08 | 贵阳冶金机电工艺有限公司 | 一种电解铝清洁生产工艺 |
Also Published As
| Publication number | Publication date |
|---|---|
| NO20160985A1 (en) | 2017-12-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MM1K | Lapsed by not paying the annual fees |