FR2494258A1 - Procede de recuperation de l'uranium present dans des solutions d'acide phosphorique - Google Patents
Procede de recuperation de l'uranium present dans des solutions d'acide phosphorique Download PDFInfo
- Publication number
- FR2494258A1 FR2494258A1 FR8024253A FR8024253A FR2494258A1 FR 2494258 A1 FR2494258 A1 FR 2494258A1 FR 8024253 A FR8024253 A FR 8024253A FR 8024253 A FR8024253 A FR 8024253A FR 2494258 A1 FR2494258 A1 FR 2494258A1
- Authority
- FR
- France
- Prior art keywords
- uranium
- organic solvent
- oxide
- process according
- radicals
- Prior art date
- 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.)
- Granted
Links
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 229910052770 Uranium Inorganic materials 0.000 title claims abstract description 73
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 229910000147 aluminium phosphate Inorganic materials 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000003960 organic solvent Substances 0.000 claims abstract description 36
- 230000007935 neutral effect Effects 0.000 claims abstract description 12
- 150000002903 organophosphorus compounds Chemical class 0.000 claims abstract description 8
- 230000002378 acidificating effect Effects 0.000 claims abstract description 7
- AUONHKJOIZSQGR-UHFFFAOYSA-N oxophosphane Chemical compound P=O AUONHKJOIZSQGR-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000000605 extraction Methods 0.000 claims description 34
- -1 alkoxyalkyl radicals Chemical class 0.000 claims description 28
- 239000000243 solution Substances 0.000 claims description 26
- 239000002253 acid Substances 0.000 claims description 23
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 22
- 150000001875 compounds Chemical class 0.000 claims description 22
- XYFCBTPGUUZFHI-UHFFFAOYSA-N Phosphine Chemical compound P XYFCBTPGUUZFHI-UHFFFAOYSA-N 0.000 claims description 21
- 229910021529 ammonia Inorganic materials 0.000 claims description 11
- 125000000217 alkyl group Chemical group 0.000 claims description 10
- 239000007864 aqueous solution Substances 0.000 claims description 10
- 229910000073 phosphorus hydride Inorganic materials 0.000 claims description 10
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims description 9
- 239000001099 ammonium carbonate Substances 0.000 claims description 9
- 235000012501 ammonium carbonate Nutrition 0.000 claims description 9
- 125000004432 carbon atom Chemical group C* 0.000 claims description 9
- 150000003254 radicals Chemical class 0.000 claims description 7
- 125000003118 aryl group Chemical group 0.000 claims description 3
- 150000005840 aryl radicals Chemical class 0.000 claims description 3
- OMLVPEUOCUINNC-UHFFFAOYSA-N 1-(dihexylphosphorylmethoxy)octane Chemical group CCCCCCCCOCP(=O)(CCCCCC)CCCCCC OMLVPEUOCUINNC-UHFFFAOYSA-N 0.000 claims description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 125000004429 atom Chemical group 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 206010034962 Photopsia Diseases 0.000 claims 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 claims 1
- SYHPANJAVIEQQL-UHFFFAOYSA-N dicarboxy carbonate Chemical compound OC(=O)OC(=O)OC(O)=O SYHPANJAVIEQQL-UHFFFAOYSA-N 0.000 claims 1
- 230000003472 neutralizing effect Effects 0.000 claims 1
- 229910000065 phosphene Inorganic materials 0.000 claims 1
- 230000001131 transforming effect Effects 0.000 claims 1
- WVPGXJOLGGFBCR-UHFFFAOYSA-N trioctyl phosphate Chemical compound CCCCCCCCOP(=O)(OCCCCCCCC)OCCCCCCCC WVPGXJOLGGFBCR-UHFFFAOYSA-N 0.000 claims 1
- 125000005289 uranyl group Chemical group 0.000 claims 1
- 230000000295 complement effect Effects 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 32
- 229910052742 iron Inorganic materials 0.000 description 16
- 238000005192 partition Methods 0.000 description 13
- 239000008346 aqueous phase Substances 0.000 description 7
- 150000002148 esters Chemical class 0.000 description 7
- 239000012071 phase Substances 0.000 description 7
- 239000002904 solvent Substances 0.000 description 7
- ZMBHCYHQLYEYDV-UHFFFAOYSA-N trioctylphosphine oxide Chemical compound CCCCCCCCP(=O)(CCCCCCCC)CCCCCCCC ZMBHCYHQLYEYDV-UHFFFAOYSA-N 0.000 description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 5
- 239000012074 organic phase Substances 0.000 description 5
- 229910052698 phosphorus Inorganic materials 0.000 description 5
- 239000011574 phosphorus Substances 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 125000002467 phosphate group Chemical group [H]OP(=O)(O[H])O[*] 0.000 description 4
- 150000003863 ammonium salts Chemical class 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 150000003138 primary alcohols Chemical class 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 150000003333 secondary alcohols Chemical class 0.000 description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- SNRUBQQJIBEYMU-UHFFFAOYSA-N dodecane Chemical compound CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 150000002894 organic compounds Chemical class 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- MDDUHVRJJAFRAU-YZNNVMRBSA-N tert-butyl-[(1r,3s,5z)-3-[tert-butyl(dimethyl)silyl]oxy-5-(2-diphenylphosphorylethylidene)-4-methylidenecyclohexyl]oxy-dimethylsilane Chemical compound C1[C@@H](O[Si](C)(C)C(C)(C)C)C[C@H](O[Si](C)(C)C(C)(C)C)C(=C)\C1=C/CP(=O)(C=1C=CC=CC=1)C1=CC=CC=C1 MDDUHVRJJAFRAU-YZNNVMRBSA-N 0.000 description 2
- WPWHSFAFEBZWBB-UHFFFAOYSA-N 1-butyl radical Chemical compound [CH2]CCC WPWHSFAFEBZWBB-UHFFFAOYSA-N 0.000 description 1
- 239000004254 Ammonium phosphate Substances 0.000 description 1
- UORXUUBFUNDSKM-UHFFFAOYSA-N CCCCCCCC(CCCCC)(CCCCC)OC=O Chemical compound CCCCCCCC(CCCCC)(CCCCC)OC=O UORXUUBFUNDSKM-UHFFFAOYSA-N 0.000 description 1
- 241001676573 Minium Species 0.000 description 1
- OCBFFGCSTGGPSQ-UHFFFAOYSA-N [CH2]CC Chemical compound [CH2]CC OCBFFGCSTGGPSQ-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 125000004183 alkoxy alkyl group Chemical group 0.000 description 1
- 125000003545 alkoxy group Chemical group 0.000 description 1
- 239000000908 ammonium hydroxide Substances 0.000 description 1
- 229910000148 ammonium phosphate Inorganic materials 0.000 description 1
- 235000019289 ammonium phosphates Nutrition 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 238000010908 decantation Methods 0.000 description 1
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 description 1
- NZZIMKJIVMHWJC-UHFFFAOYSA-N dibenzoylmethane Chemical compound C=1C=CC=CC=1C(=O)CC(=O)C1=CC=CC=C1 NZZIMKJIVMHWJC-UHFFFAOYSA-N 0.000 description 1
- VANPZBANAIIRJW-UHFFFAOYSA-N diuranium Chemical compound [U]#[U] VANPZBANAIIRJW-UHFFFAOYSA-N 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 125000001033 ether group Chemical group 0.000 description 1
- 229960004887 ferric hydroxide Drugs 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 159000000011 group IA salts Chemical class 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- SAWKFRBJGLMMES-UHFFFAOYSA-N methylphosphine Chemical compound PC SAWKFRBJGLMMES-UHFFFAOYSA-N 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 238000005375 photometry Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229930195734 saturated hydrocarbon Natural products 0.000 description 1
- 235000015096 spirit Nutrition 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 229910000163 uranium phosphate Inorganic materials 0.000 description 1
- AAORDHMTTHGXCV-UHFFFAOYSA-N uranium(6+) Chemical compound [U+6] AAORDHMTTHGXCV-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- C22B60/00—Obtaining metals of atomic number 87 or higher, i.e. radioactive metals
- C22B60/02—Obtaining thorium, uranium, or other actinides
- C22B60/0204—Obtaining thorium, uranium, or other actinides obtaining uranium
- C22B60/0217—Obtaining thorium, uranium, or other actinides obtaining uranium by wet processes
- C22B60/0252—Obtaining thorium, uranium, or other actinides obtaining uranium by wet processes treatment or purification of solutions or of liquors or of slurries
- C22B60/026—Obtaining thorium, uranium, or other actinides obtaining uranium by wet processes treatment or purification of solutions or of liquors or of slurries liquid-liquid extraction with or without dissolution in organic solvents
Landscapes
- Engineering & Computer Science (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Manufacturing & Machinery (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Extraction Or Liquid Replacement (AREA)
- Manufacture And Refinement Of Metals (AREA)
Priority Applications (15)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8024253A FR2494258A1 (fr) | 1980-11-14 | 1980-11-14 | Procede de recuperation de l'uranium present dans des solutions d'acide phosphorique |
| DE8181401686T DE3168526D1 (en) | 1980-11-14 | 1981-10-23 | Process for recovering uranium (vi) from phosphoric-acid solutions |
| EP81401686A EP0053054B1 (fr) | 1980-11-14 | 1981-10-23 | Procédé de récupération de l'uranium (VI) présent dans des solutions d'acide phosphorique |
| AU76847/81A AU542919B2 (en) | 1980-11-14 | 1981-10-27 | Process of recovering uranium (vi) from solutions of phosphoric acid |
| ZA817498A ZA817498B (en) | 1980-11-14 | 1981-10-29 | Uranium(vi)recovery process |
| US06/316,941 US4432946A (en) | 1980-11-14 | 1981-10-30 | Uranium (VI) recovery process using acid organophosphorus extractant containing two or four alkoxyalkyl or aryloxyalkyl radicals |
| YU2627/81A YU42740B (en) | 1980-11-14 | 1981-11-05 | Process for recovering uranium (vi) present in phosphoric acid solutions |
| EG659/81A EG15457A (en) | 1980-11-14 | 1981-11-11 | Procede de recuperation de l'uranium present dans des solutions d'acide phosphorique |
| MA19532A MA19328A1 (fr) | 1980-11-14 | 1981-11-11 | Procede de recuperation de l'uranium (vi) present dans des solutions d'acide phosphorique . |
| CA000389920A CA1188106A (en) | 1980-11-14 | 1981-11-12 | Uranium (vi) recovery process |
| JP56182163A JPS57110324A (en) | 1980-11-14 | 1981-11-13 | Method of recovering uranium (vi) |
| BR8107393A BR8107393A (pt) | 1980-11-14 | 1981-11-13 | Processo para recuperacao de uranio(vi)presente em uma solucao de acido fosforico |
| ES507131A ES8206387A1 (es) | 1980-11-14 | 1981-11-13 | Procedimiento para la recuperacion del uranio (vi) presente en una solucion de acido fosforico. |
| OA57540A OA06944A (fr) | 1980-11-14 | 1981-11-14 | Procédé de récupération de l'uranium(VI) présent dans ses solutions d'acide phosphorique. |
| JO19821166A JO1166B1 (en) | 1980-11-14 | 1982-02-18 | Uranium extraction and preparation from phosphoric acid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8024253A FR2494258A1 (fr) | 1980-11-14 | 1980-11-14 | Procede de recuperation de l'uranium present dans des solutions d'acide phosphorique |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2494258A1 true FR2494258A1 (fr) | 1982-05-21 |
| FR2494258B1 FR2494258B1 (enExample) | 1984-11-02 |
Family
ID=9247989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR8024253A Granted FR2494258A1 (fr) | 1980-11-14 | 1980-11-14 | Procede de recuperation de l'uranium present dans des solutions d'acide phosphorique |
Country Status (15)
| Country | Link |
|---|---|
| US (1) | US4432946A (enExample) |
| EP (1) | EP0053054B1 (enExample) |
| JP (1) | JPS57110324A (enExample) |
| AU (1) | AU542919B2 (enExample) |
| BR (1) | BR8107393A (enExample) |
| CA (1) | CA1188106A (enExample) |
| DE (1) | DE3168526D1 (enExample) |
| EG (1) | EG15457A (enExample) |
| ES (1) | ES8206387A1 (enExample) |
| FR (1) | FR2494258A1 (enExample) |
| JO (1) | JO1166B1 (enExample) |
| MA (1) | MA19328A1 (enExample) |
| OA (1) | OA06944A (enExample) |
| YU (1) | YU42740B (enExample) |
| ZA (1) | ZA817498B (enExample) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017001494A1 (fr) | 2015-06-30 | 2017-01-05 | Areva Mines | Procede de separation du fer d'une phase organique contenant de l'uranium et procede d'extraction de l'uranium d'une solution aqueuse d'acide mineral contenant de l'uranium et du fer |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2596383B1 (fr) * | 1986-03-28 | 1990-10-26 | Cogema | Procede de separation du fer a partir d'une solution organique contenant de l'uranium |
| US5188736A (en) * | 1991-08-27 | 1993-02-23 | Institute Of Nuclear Energy Research | Process for the separation and recovery of extractant from spent solvent |
| US20110226694A1 (en) * | 2010-03-22 | 2011-09-22 | Battelle Energy Alliance, Llc | Methods of reducing radiotoxicity in aqueous acidic solutions and a reaction system for same |
| FR3069539B1 (fr) | 2017-07-31 | 2019-08-30 | Areva Mines | Composes bifonctionnels a fonction thiophosphine, utiles comme extractants de l'uranium(vi), leurs procedes de synthese et leurs utilisations |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2860031A (en) * | 1956-06-29 | 1958-11-11 | Robert R Grinstead | Process for utilizing organic orthophosphate extractants |
| FR1303476A (fr) * | 1960-06-03 | 1962-09-14 | Atomic Energy Commission | Procédé d'extraction liquide-liquide pour la récupération de l'uranium |
| IL52756A0 (en) * | 1976-09-10 | 1977-10-31 | Westinghouse Electric Corp | Recovery of uranium from wet process phosphoric acid |
| FR2423545A1 (fr) * | 1977-08-25 | 1979-11-16 | Minemet Rech Sa | Procede pour la recuperation de l'uranium contenu dans des solutions phosphatees |
| US4243637A (en) * | 1977-10-11 | 1981-01-06 | Occidental Petroleum Company | Uranium recovery from pre-treated phosphoric acid |
| FR2442796A1 (fr) * | 1978-11-28 | 1980-06-27 | Commissariat Energie Atomique | Procede de recuperation de l'uranium present dans les solutions d'acide phosphorique |
| IL58726A (en) * | 1978-11-28 | 1982-12-31 | Commissariat Energie Atomique | Recovery of uranium from phosphoric acid solutions |
-
1980
- 1980-11-14 FR FR8024253A patent/FR2494258A1/fr active Granted
-
1981
- 1981-10-23 EP EP81401686A patent/EP0053054B1/fr not_active Expired
- 1981-10-23 DE DE8181401686T patent/DE3168526D1/de not_active Expired
- 1981-10-27 AU AU76847/81A patent/AU542919B2/en not_active Ceased
- 1981-10-29 ZA ZA817498A patent/ZA817498B/xx unknown
- 1981-10-30 US US06/316,941 patent/US4432946A/en not_active Expired - Fee Related
- 1981-11-05 YU YU2627/81A patent/YU42740B/xx unknown
- 1981-11-11 MA MA19532A patent/MA19328A1/fr unknown
- 1981-11-11 EG EG659/81A patent/EG15457A/xx active
- 1981-11-12 CA CA000389920A patent/CA1188106A/en not_active Expired
- 1981-11-13 JP JP56182163A patent/JPS57110324A/ja active Pending
- 1981-11-13 ES ES507131A patent/ES8206387A1/es not_active Expired
- 1981-11-13 BR BR8107393A patent/BR8107393A/pt unknown
- 1981-11-14 OA OA57540A patent/OA06944A/xx unknown
-
1982
- 1982-02-18 JO JO19821166A patent/JO1166B1/en active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017001494A1 (fr) | 2015-06-30 | 2017-01-05 | Areva Mines | Procede de separation du fer d'une phase organique contenant de l'uranium et procede d'extraction de l'uranium d'une solution aqueuse d'acide mineral contenant de l'uranium et du fer |
Also Published As
| Publication number | Publication date |
|---|---|
| ES507131A0 (es) | 1982-08-16 |
| ZA817498B (en) | 1982-10-27 |
| EG15457A (en) | 1988-10-31 |
| JPS57110324A (en) | 1982-07-09 |
| BR8107393A (pt) | 1982-08-10 |
| US4432946A (en) | 1984-02-21 |
| YU42740B (en) | 1988-12-31 |
| JO1166B1 (en) | 1983-11-30 |
| FR2494258B1 (enExample) | 1984-11-02 |
| DE3168526D1 (en) | 1985-03-07 |
| ES8206387A1 (es) | 1982-08-16 |
| MA19328A1 (fr) | 1982-07-01 |
| EP0053054B1 (fr) | 1985-01-23 |
| YU262781A (en) | 1983-12-31 |
| OA06944A (fr) | 1983-07-31 |
| EP0053054A1 (fr) | 1982-06-02 |
| CA1188106A (en) | 1985-06-04 |
| AU542919B2 (en) | 1985-03-21 |
| AU7684781A (en) | 1982-05-20 |
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