EP0486410B1 - Procédé de traitement par voie humide de brasquages usés provenant de cuves d'électrolyse Hall-Héroult - Google Patents

Procédé de traitement par voie humide de brasquages usés provenant de cuves d'électrolyse Hall-Héroult Download PDF

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Publication number: EP0486410B1
Authority: EP; European Patent Office
Prior art keywords: suspension; process according; treatment process; linings; lime
Prior art date: 1990-11-16
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.): Expired - Lifetime

Application number

EP91420402A

Other languages

German (de)

English (en)

French (fr)

Other versions

EP0486410A1 (fr

Inventor

Jean-Claude Bontron

Pierre-Bernard Personnet

Jean-Michel Lamerant

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Rio Tinto France SAS

Original Assignee

Aluminium Pechiney SA

Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)

1990-11-16

Filing date

1991-11-14

Publication date

1995-03-01

1991-11-14 Application filed by Aluminium Pechiney SA filed Critical Aluminium Pechiney SA

1992-05-20 Publication of EP0486410A1 publication Critical patent/EP0486410A1/fr

1995-03-01 Application granted granted Critical

1995-03-01 Publication of EP0486410B1 publication Critical patent/EP0486410B1/fr

2011-11-14 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

Links

238000000034 method Methods 0.000 title claims description 35
238000011282 treatment Methods 0.000 title claims description 24
239000000725 suspension Substances 0.000 claims description 33
XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
150000001875 compounds Chemical class 0.000 claims description 20
238000005406 washing Methods 0.000 claims description 20
239000011734 sodium Substances 0.000 claims description 19
NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 18
229910052731 fluorine Inorganic materials 0.000 claims description 17
YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 15
239000011737 fluorine Substances 0.000 claims description 15
239000000203 mixture Substances 0.000 claims description 15
235000008733 Citrus aurantifolia Nutrition 0.000 claims description 14
CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 14
235000011941 Tilia x europaea Nutrition 0.000 claims description 14
WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 14
239000004571 lime Substances 0.000 claims description 14
229910001634 calcium fluoride Inorganic materials 0.000 claims description 13
229910052708 sodium Inorganic materials 0.000 claims description 13
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 claims description 10
239000005995 Aluminium silicate Substances 0.000 claims description 9
235000012211 aluminium silicate Nutrition 0.000 claims description 9
239000007787 solid Substances 0.000 claims description 9
238000000227 grinding Methods 0.000 claims description 8
229910052622 kaolinite Inorganic materials 0.000 claims description 8
230000015572 biosynthetic process Effects 0.000 claims description 7
238000001556 precipitation Methods 0.000 claims description 6
XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 claims description 5
PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 5
239000004927 clay Substances 0.000 claims description 5
239000002245 particle Substances 0.000 claims description 5
239000003643 water by type Substances 0.000 claims description 5
239000012736 aqueous medium Substances 0.000 claims description 4
XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 claims description 4
239000002244 precipitate Substances 0.000 claims description 4
229910052593 corundum Inorganic materials 0.000 claims description 3
238000005470 impregnation Methods 0.000 claims description 3
-1 on the one hand Substances 0.000 claims description 3
238000004064 recycling Methods 0.000 claims description 3
229910001845 yogo sapphire Inorganic materials 0.000 claims description 3
229910052900 illite Inorganic materials 0.000 claims description 2
VGIBGUSAECPPNB-UHFFFAOYSA-L nonaaluminum;magnesium;tripotassium;1,3-dioxido-2,4,5-trioxa-1,3-disilabicyclo[1.1.1]pentane;iron(2+);oxygen(2-);fluoride;hydroxide Chemical compound [OH-].[O-2].[O-2].[O-2].[O-2].[O-2].[F-].[Mg+2].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[K+].[K+].[K+].[Fe+2].O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2 VGIBGUSAECPPNB-UHFFFAOYSA-L 0.000 claims description 2
229910001515 alkali metal fluoride Inorganic materials 0.000 claims 1
230000000717 retained effect Effects 0.000 claims 1
238000006243 chemical reaction Methods 0.000 description 12
239000000047 product Substances 0.000 description 11
238000002386 leaching Methods 0.000 description 10
HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
238000012360 testing method Methods 0.000 description 9
150000002222 fluorine compounds Chemical class 0.000 description 7
238000001914 filtration Methods 0.000 description 6
150000002825 nitriles Chemical class 0.000 description 6
OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
229910052782 aluminium Inorganic materials 0.000 description 5
XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
229910052799 carbon Inorganic materials 0.000 description 5
238000004519 manufacturing process Methods 0.000 description 5
238000005868 electrolysis reaction Methods 0.000 description 4
238000003860 storage Methods 0.000 description 4
BFRXZIMAUMUZJH-UHFFFAOYSA-M [OH-].[Na+].[Na+].[Na+].[Na+].[Al+3].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-] Chemical compound [OH-].[Na+].[Na+].[Na+].[Na+].[Al+3].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-] BFRXZIMAUMUZJH-UHFFFAOYSA-M 0.000 description 3
238000002485 combustion reaction Methods 0.000 description 3
239000007788 liquid Substances 0.000 description 3
229910052751 metal Inorganic materials 0.000 description 3
239000002184 metal Substances 0.000 description 3
238000011084 recovery Methods 0.000 description 3
239000010457 zeolite Substances 0.000 description 3
KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminium flouride Chemical compound F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 description 2
OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 2
ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 2
229910052791 calcium Inorganic materials 0.000 description 2
239000011575 calcium Substances 0.000 description 2
AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
239000000920 calcium hydroxide Substances 0.000 description 2
235000011116 calcium hydroxide Nutrition 0.000 description 2
229910001861 calcium hydroxide Inorganic materials 0.000 description 2
229910001610 cryolite Inorganic materials 0.000 description 2
238000000354 decomposition reaction Methods 0.000 description 2
238000009826 distribution Methods 0.000 description 2
239000003344 environmental pollutant Substances 0.000 description 2
239000000706 filtrate Substances 0.000 description 2
235000020094 liqueur Nutrition 0.000 description 2
239000002609 medium Substances 0.000 description 2
150000002739 metals Chemical class 0.000 description 2
231100000719 pollutant Toxicity 0.000 description 2
239000000377 silicon dioxide Substances 0.000 description 2
229910001388 sodium aluminate Inorganic materials 0.000 description 2
238000005476 soldering Methods 0.000 description 2
230000009466 transformation Effects 0.000 description 2
QYLJIYOGHRGUIH-CIUDSAMLSA-N Arg-Ile Chemical compound CC[C@H](C)[C@@H](C(O)=O)NC(=O)[C@@H](N)CCCNC(N)=N QYLJIYOGHRGUIH-CIUDSAMLSA-N 0.000 description 1
238000004131 Bayer process Methods 0.000 description 1
229910004742 Na2 O Inorganic materials 0.000 description 1
229910014155 Na—Pt Inorganic materials 0.000 description 1
KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 1
XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
229910021536 Zeolite Inorganic materials 0.000 description 1
239000000654 additive Substances 0.000 description 1
238000005054 agglomeration Methods 0.000 description 1
230000002776 aggregation Effects 0.000 description 1
238000013019 agitation Methods 0.000 description 1
229910052783 alkali metal Inorganic materials 0.000 description 1
150000001340 alkali metals Chemical class 0.000 description 1
HIGRAKVNKLCVCA-UHFFFAOYSA-N alumine Chemical compound C1=CC=[Al]C=C1 HIGRAKVNKLCVCA-UHFFFAOYSA-N 0.000 description 1
229910052908 analcime Inorganic materials 0.000 description 1
239000000440 bentonite Substances 0.000 description 1
229910000278 bentonite Inorganic materials 0.000 description 1
SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
230000000903 blocking effect Effects 0.000 description 1
238000005219 brazing Methods 0.000 description 1
239000000292 calcium oxide Substances 0.000 description 1
235000012255 calcium oxide Nutrition 0.000 description 1
KXZJHVJKXJLBKO-UHFFFAOYSA-N chembl1408157 Chemical compound N=1C2=CC=CC=C2C(C(=O)O)=CC=1C1=CC=C(O)C=C1 KXZJHVJKXJLBKO-UHFFFAOYSA-N 0.000 description 1
239000003153 chemical reaction reagent Substances 0.000 description 1
230000000052 comparative effect Effects 0.000 description 1
238000001816 cooling Methods 0.000 description 1
230000001419 dependent effect Effects 0.000 description 1
238000013461 design Methods 0.000 description 1
238000010586 diagram Methods 0.000 description 1
GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
230000005496 eutectics Effects 0.000 description 1
230000002349 favourable effect Effects 0.000 description 1
239000000945 filler Substances 0.000 description 1
230000004927 fusion Effects 0.000 description 1
239000013529 heat transfer fluid 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
238000009434 installation Methods 0.000 description 1
239000012212 insulator Substances 0.000 description 1
238000010169 landfilling Methods 0.000 description 1
239000012633 leachable Substances 0.000 description 1
229910052901 montmorillonite Inorganic materials 0.000 description 1
239000012452 mother liquor Substances 0.000 description 1
230000001590 oxidative effect Effects 0.000 description 1
238000012856 packing Methods 0.000 description 1
230000035699 permeability Effects 0.000 description 1
229940072033 potash Drugs 0.000 description 1
BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 1
235000015320 potassium carbonate Nutrition 0.000 description 1
238000002360 preparation method Methods 0.000 description 1
230000035484 reaction time Effects 0.000 description 1
239000011819 refractory material Substances 0.000 description 1
230000001105 regulatory effect Effects 0.000 description 1
238000003303 reheating Methods 0.000 description 1
238000000926 separation method Methods 0.000 description 1
229910052710 silicon Inorganic materials 0.000 description 1
239000010703 silicon Substances 0.000 description 1
150000003385 sodium Chemical class 0.000 description 1
235000017550 sodium carbonate Nutrition 0.000 description 1
229910000029 sodium carbonate Inorganic materials 0.000 description 1
PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Inorganic materials [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 description 1
UAFLSWIPEFYJSC-UHFFFAOYSA-K sodium lead(2+) trihydroxide Chemical compound [OH-].[OH-].[OH-].[Na+].[Pb++] UAFLSWIPEFYJSC-UHFFFAOYSA-K 0.000 description 1
238000007711 solidification Methods 0.000 description 1
230000008023 solidification Effects 0.000 description 1
238000009987 spinning Methods 0.000 description 1
238000003756 stirring Methods 0.000 description 1
239000000126 substance Substances 0.000 description 1
238000007669 thermal treatment Methods 0.000 description 1

Images

Classifications

- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D3/00—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances
- A62D3/30—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances by reacting with chemical agents
- A62D3/35—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances by reacting with chemical agents by hydrolysis
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D3/00—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances
- A62D3/30—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances by reacting with chemical agents
- A62D3/33—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances by reacting with chemical agents by chemical fixing the harmful substance, e.g. by chelation or complexation
- 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
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D2101/00—Harmful chemical substances made harmless, or less harmful, by effecting chemical change
- A62D2101/40—Inorganic substances
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D2101/00—Harmful chemical substances made harmless, or less harmful, by effecting chemical change
- A62D2101/40—Inorganic substances
- A62D2101/45—Inorganic substances containing nitrogen or phosphorus
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D2101/00—Harmful chemical substances made harmless, or less harmful, by effecting chemical change
- A62D2101/40—Inorganic substances
- A62D2101/49—Inorganic substances containing halogen
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D2203/00—Aspects of processes for making harmful chemical substances harmless, or less harmful, by effecting chemical change in the substances
- A62D2203/02—Combined processes involving two or more distinct steps covered by groups A62D3/10 - A62D3/40

Definitions

the invention relates to a process for the treatment, by the wet process, of used pot linings originating notably from the dismantling of tanks for the production of aluminum by electrolysis according to the Hall-Héroult technique.
an aluminum production plant with a capacity of 240,000 t / year generates about 4,000 t / year of spent pot lining, which consists of carbonaceous cathode blocks, seals and side linings made of carbonaceous paste, but also by all of the refractories and insulators arranged on the side walls and the bottom of the metal box forming the electrolysis tank.
these packing products are heavily impregnated with harmful products, such as soluble sodium or sodo-aluminous fluorides, and cyanides which must be insolubilized or destroyed before being landfilled or reused.
the method according to the invention relates to a treatment for insolubilization by the wet method of used soldering with a view to their storage or their landfill.
These mixtures of variable composition consist of carbonaceous products (30% to 50% by weight) but also of refractory elements, generally of the silico-aluminous type, impregnated with cyanides (CN ⁇ 1% by weight) of fluorinated compounds (F ⁇ 20%) generally alkaline, sodium (Na ⁇ 20%) mainly as NaF.
the process according to the invention is based on the observation that it is possible to recombine, with inexpensive and readily available additives, almost all of the fluorine of the fluorinated compounds impregnating the spent pot lining as well as the free soda produced from the causticization reaction, to form insoluble compounds which are easily filterable, while the remaining soluble compounds such as cyanides, generally in the state of sodium cyanide, are dissociated under the temperature and pressure conditions chosen to carry out these insolubilization reactions.
soda released by the calcium attack on alkaline fluorides tends to react hot with certain non-soluble aluminous compounds to form sodium aluminate. It is therefore preferable to carry out lime leaching at a temperature t ⁇ 80 ° C. and in a sufficiently diluted medium, preferably with a dry matter concentration of less than 500 g per liter of suspension.
the hot fixation of the soda with a clay, to form an insoluble synthetic compound is carried out for example by kaolinite (2SiO2, Al2O3, 2H2O) in the natural state of kaolin, with formation of insoluble feldspathoids such as hydroxysodalite, depending on the reaction: 3 (2SiO2, Al2O3, 2H2O) + 8NaOH ---> 3Al2O3, 6SiO2, 4Na2O, H2O + 9H2O which requires the use of at least 2.42 kg of kaolinite per kg of free sodium hydroxide.
the amount of free sodium hydroxide obviously varies according to the chemical composition of the pot lining and the proportion of pot lining crushed in the suspension.
the addition of kaolinite is regulated between 0.12 and 0.20 kg per kg of suspension, the weight composition of which, for sodium contents in the used pot lining generally between 10% and 15% by weight, varies in the following proportions: Crushed solderings ⁇ 5 mm 20 to 30% Slaked lime 4 to 7% Recycled water or liquor 63 to 76%
the main clays usable include illite and smectites such as montmorillonite, bentonite, which by fixing the free sodium hydroxide lead to the formation of a mixture of insoluble zeolites (analcime and zeolite Na-Pt). More generally, the mixtures thus formed are synthetic feldspathoids or zeolites.
reaction temperature which must be above 140 ° C. and preferably between 180 ° C and 250 ° C.
the increase in temperature promotes, on the one hand the reaction in the direction of the transformation of the clay into insoluble synthetic compound by fixing of free soda, on the other hand the decomposition of the cyanides by hydrolysis according to the basic reaction CN ⁇ + 2H2O ---> NH3 + HCOO ⁇
the increase in temperature finally promotes the formation of precipitates with a "permeable" texture, that is to say easily filterable and washable.
the excellent permeability of the solid cake which can be effectively washed with a relatively small volume of water is observed since the "wash ratio" is that is to say the volume of water necessary for washing relative to the volume of water impregnating the wet cake after spinning, is substantially close to 1.
the mother liquors and the washing waters are combined to form a weakly alkaline liquor which is recycled in the first two stages of the process for the preparation of the pot lining and lime suspensions on the one hand and kaolin on the other hand.
the wet residue As for the wet residue, it is subjected to a leaching test according to French standard X 31-210 to determine the levels of cyanide, sodium and fluorine; the CN content by weight must remain below 0.01% and the fluorine content must remain below a limit which varies, according to the national standards in force, between 0.05% and 0.3%.
Table 1 summarizes the most significant characteristics of comparative tests of autoclave treatments, for 3 hours, at different temperatures 145 ° C, 180 ° C and 220 ° C of 3 samples of 2 kg of a suspension of "all comings" crushed pot lining whose fluorine and sodium contents were 10.1% and 14.9% respectively.
the weight composition of the 2 kg samples was 0.47 kg of pot lining, 0.1 kg of slaked lime and 1.43 kg of water.
the proportion of Kaolin then added was 0.15 kg per kg of suspension.
the suspension after autoclave treatment was cooled to below 100 ° C and filtered under a vacuum of 500 mm Hg. TABLE 1 Test No.
an autogenous grinder is fed simultaneously with the crushed product 2 at a rate of 1 t / h, quicklime 3 (grain size 0-10 mm) at a rate of 0.25 t / h, recycled liquor 4 at a rate of 4, 0m3 / h.
the autogenous grinder operates in a closed circuit on a 1 mm mesh screen.
the suspension obtained 5 is stored in a stirred tank for an average period of 1 hour.
a heat transfer fluid rotates in a closed circuit between the two exchangers and a boiler where an additional thermal energy is made 21, 22 and 23.
the cooled suspension 13 is then filtered and the cake formed is washed on belt filter.
the mother liquors 15 and the washing waters 17 representing a total of 5.5 m3 / h are combined in a storage tank to form the recycled liquor 4 and 6.
the washing water 16 is 3.1 m3 / hour compensates for the loss of water by impregnating the residue.
wet residue has a total weight of 5.5 tonnes, including 3.1 tonnes of water.

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Chemical & Material Sciences (AREA)
Chemical Kinetics & Catalysis (AREA)
Emergency Management (AREA)
General Health & Medical Sciences (AREA)
Business, Economics & Management (AREA)
General Chemical & Material Sciences (AREA)
Toxicology (AREA)
Health & Medical Sciences (AREA)
Organic Chemistry (AREA)
Electrochemistry (AREA)
Metallurgy (AREA)
Materials Engineering (AREA)
Engineering & Computer Science (AREA)
Processing Of Solid Wastes (AREA)
Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Water Treatment By Electricity Or Magnetism (AREA)

EP91420402A 1990-11-16 1991-11-14 Procédé de traitement par voie humide de brasquages usés provenant de cuves d'électrolyse Hall-Héroult Expired - Lifetime EP0486410B1 (fr)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
FR9014825		1990-11-16
FR9014825A FR2669350B1 (fr)	1990-11-16	1990-11-16	Procede de traitement par voie humide de brasquages uses provenant de cuves d'electrolyse hall-heroult.

Publications (2)

Publication Number	Publication Date
EP0486410A1 EP0486410A1 (fr)	1992-05-20
EP0486410B1 true EP0486410B1 (fr)	1995-03-01

Family

ID=9402646

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP91420402A Expired - Lifetime EP0486410B1 (fr)	1990-11-16	1991-11-14	Procédé de traitement par voie humide de brasquages usés provenant de cuves d'électrolyse Hall-Héroult

Country Status (12)

Country	Link
US (1)	US5245116A (el)
EP (1)	EP0486410B1 (el)
AU (1)	AU632717B2 (el)
CA (1)	CA2055135A1 (el)
DE (1)	DE69107796T2 (el)
ES (1)	ES2069254T3 (el)
FR (1)	FR2669350B1 (el)
GR (1)	GR3015282T3 (el)
IS (1)	IS3779A7 (el)
NO (1)	NO178363C (el)
NZ (1)	NZ240534A (el)
ZA (1)	ZA919066B (el)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
ZA935347B (en) *	1992-07-24	1994-03-14	Comalco Alu	Treatment of solid material
US5470559A (en) *	1993-02-26	1995-11-28	Alcan International Limited	Recycling of spent pot linings
US5558690A (en) *	1994-12-23	1996-09-24	Vortec Corporation	Manufacture of ceramic tiles from spent aluminum potlining
US5538604A (en) *	1995-01-20	1996-07-23	Emec Consultants	Suppression of cyanide formation in electrolytic cell lining
EP0892765A4 (en) *	1996-04-09	2000-03-15	Vortec Corp	PRODUCTION OF CERAMIC TILES FROM FLYING BAGS
FR2756198B1 (fr) *	1996-11-26	1998-12-18	Pechiney Aluminium	Procede d'insolubilisation et de consolidation de brasques usees provenant des cuves d'electrolyse hall-heroult
WO1998030499A1 (en) *	1997-01-14	1998-07-16	Cashman Joseph B	Detoxifying aluminum spent potliners
CA2588929A1 (fr) *	2007-05-11	2008-11-11	Institut National De La Recherche Scientifique (Inrs)	Procede de traitement des dechets d'aluminerie contamines par des hydrocarbures aromatiques polycycliques (hap) et des fluorures
ES2306618B1 (es) *	2008-04-04	2009-07-20	Xiloga, S.L	Procedimiento de reciclado de spent pot linings (spls) procedentes de la produccion de aluminio primario.
US20110081284A1 (en) *	2009-10-02	2011-04-07	Mark Weaver	Treatment of bauxite residue and spent pot lining
WO2014026138A1 (en) *	2012-08-09	2014-02-13	Alcoa Inc.	High-carbon spent pot lining and methods of fueling a furnace with the same
CN113426807B (zh) *	2021-06-29	2022-05-17	云南云铝润鑫铝业有限公司	铝电解危废渣联合处理和资源综合利用方法
CN113426808B (zh) *	2021-06-29	2022-05-17	云南云铝润鑫铝业有限公司	一种铝电解大修渣加压碱浸回收氟化盐的方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US4113831A (en) *	1975-10-02	1978-09-12	National Fluoride And Chemical Corporation	Recovery of sodium fluoride and other chemicals from spent carbon liners
US4113832A (en) *	1977-11-28	1978-09-12	Kaiser Aluminum & Chemical Corporation	Process for the utilization of waste materials from electrolytic aluminum reduction systems
GB2056425A (en) *	1979-08-06	1981-03-18	Alcan Res & Dev	Treatment of wastes containing water-leachable fluorides
US4447740A (en) *	1979-11-08	1984-05-08	Heck Louis J	Wave responsive generator
GB8301974D0 (en) *	1983-01-25	1983-02-23	Alcan Int Ltd	Aluminium fluoride from scrap
GB8305583D0 (en) *	1983-03-01	1983-03-30	Alcan Int Ltd	Treatment of scrap lining material
US4889695A (en) *	1985-02-20	1989-12-26	Aluminum Company Of America	Reclaiming spent potlining

1990
- 1990-11-16 FR FR9014825A patent/FR2669350B1/fr not_active Expired - Fee Related
1991
- 1991-10-30 IS IS3779A patent/IS3779A7/is unknown
- 1991-11-07 CA CA002055135A patent/CA2055135A1/fr not_active Abandoned
- 1991-11-08 NO NO914367A patent/NO178363C/no unknown
- 1991-11-11 NZ NZ240534A patent/NZ240534A/en unknown
- 1991-11-13 AU AU87850/91A patent/AU632717B2/en not_active Ceased
- 1991-11-14 ES ES91420402T patent/ES2069254T3/es not_active Expired - Lifetime
- 1991-11-14 EP EP91420402A patent/EP0486410B1/fr not_active Expired - Lifetime
- 1991-11-14 DE DE69107796T patent/DE69107796T2/de not_active Expired - Fee Related
- 1991-11-15 ZA ZA919066A patent/ZA919066B/xx unknown
- 1991-11-18 US US07/793,114 patent/US5245116A/en not_active Expired - Fee Related
1995
- 1995-03-03 GR GR950400459T patent/GR3015282T3/el unknown

Also Published As

Publication number	Publication date
EP0486410A1 (fr)	1992-05-20
AU632717B2 (en)	1993-01-07
AU8785091A (en)	1992-05-21
NO914367D0 (no)	1991-11-08
NO178363C (no)	1996-03-13
FR2669350A1 (fr)	1992-05-22
DE69107796D1 (de)	1995-04-06
FR2669350B1 (fr)	1993-01-15
CA2055135A1 (fr)	1992-05-17
NO914367L (no)	1992-05-18
ES2069254T3 (es)	1995-05-01
NZ240534A (en)	1994-05-26
IS3779A7 (is)	1992-05-17
GR3015282T3 (en)	1995-06-30
DE69107796T2 (de)	1995-06-29
ZA919066B (en)	1992-08-26
NO178363B (no)	1995-12-04
US5245116A (en)	1993-09-14

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Publication	Publication Date	Title
EP0486410B1 (fr)	1995-03-01	Procédé de traitement par voie humide de brasquages usés provenant de cuves d'électrolyse Hall-Héroult
AU667606B2 (en)	1996-03-28	Recycling of spent pot linings
US5352419A (en)	1994-10-04	Recovery of aluminium and fluoride values from spent pot lining
US5024822A (en)	1991-06-18	Stabilization of fluorides of spent potlining by chemical dispersion
CA1308232C (en)	1992-10-06	Method for the continuous chemical reduction and removal of mineral matter contained in carbon structures
GB2056425A (en)	1981-03-18	Treatment of wastes containing water-leachable fluorides
US4956158A (en)	1990-09-11	Stabilization of fluorides of spent potlining by chemical dispersion
CA2118943C (en)	2004-04-20	Treatment of solid material
US6596252B2 (en)	2003-07-22	Recycling of spent pot linings
US5227143A (en)	1993-07-13	Process for the removal of salts from aluminum dross
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