NO772810L - Fremgangsm}te for gjenvinning av sink og mangandioksyd - Google Patents
Fremgangsm}te for gjenvinning av sink og mangandioksydInfo
- Publication number
- NO772810L NO772810L NO772810A NO772810A NO772810L NO 772810 L NO772810 L NO 772810L NO 772810 A NO772810 A NO 772810A NO 772810 A NO772810 A NO 772810A NO 772810 L NO772810 L NO 772810L
- Authority
- NO
- Norway
- Prior art keywords
- zinc
- manganese
- leaching
- solution
- approx
- Prior art date
Links
- 239000011701 zinc Substances 0.000 title description 104
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title description 100
- 229910052725 zinc Inorganic materials 0.000 title description 99
- 238000000034 method Methods 0.000 title description 55
- 238000004064 recycling Methods 0.000 title 1
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 74
- 238000002386 leaching Methods 0.000 description 70
- 239000000243 solution Substances 0.000 description 69
- 239000011572 manganese Substances 0.000 description 58
- 238000005868 electrolysis reaction Methods 0.000 description 57
- 229910052748 manganese Inorganic materials 0.000 description 54
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 47
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 34
- 239000012141 concentrate Substances 0.000 description 28
- 239000002253 acid Substances 0.000 description 21
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 20
- 230000015572 biosynthetic process Effects 0.000 description 16
- 239000000047 product Substances 0.000 description 16
- 239000003792 electrolyte Substances 0.000 description 15
- 229910052742 iron Inorganic materials 0.000 description 15
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 14
- 239000007787 solid Substances 0.000 description 13
- 239000007788 liquid Substances 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 11
- 239000000463 material Substances 0.000 description 11
- 238000000926 separation method Methods 0.000 description 11
- 239000000126 substance Substances 0.000 description 11
- 238000011084 recovery Methods 0.000 description 10
- 238000011282 treatment Methods 0.000 description 9
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 8
- -1 on the other hand Substances 0.000 description 8
- 229960001296 zinc oxide Drugs 0.000 description 8
- 239000005083 Zinc sulfide Substances 0.000 description 7
- 239000010949 copper Substances 0.000 description 7
- 238000000151 deposition Methods 0.000 description 7
- 230000008021 deposition Effects 0.000 description 7
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- PTFCDOFLOPIGGS-UHFFFAOYSA-N Zinc dication Chemical compound [Zn+2] PTFCDOFLOPIGGS-UHFFFAOYSA-N 0.000 description 6
- 150000001450 anions Chemical class 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 229910052793 cadmium Inorganic materials 0.000 description 6
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 6
- 238000005266 casting Methods 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 238000002844 melting Methods 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 239000011787 zinc oxide Substances 0.000 description 6
- 238000000227 grinding Methods 0.000 description 5
- 238000006386 neutralization reaction Methods 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 239000005864 Sulphur Substances 0.000 description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000011109 contamination Methods 0.000 description 4
- YADSGOSSYOOKMP-UHFFFAOYSA-N dioxolead Chemical compound O=[Pb]=O YADSGOSSYOOKMP-UHFFFAOYSA-N 0.000 description 4
- 238000000605 extraction Methods 0.000 description 4
- 229910002804 graphite Inorganic materials 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- 229910052719 titanium Inorganic materials 0.000 description 4
- 150000003751 zinc Chemical class 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 239000012527 feed solution Substances 0.000 description 3
- 239000011702 manganese sulphate Substances 0.000 description 3
- 235000007079 manganese sulphate Nutrition 0.000 description 3
- SQQMAOCOWKFBNP-UHFFFAOYSA-L manganese(II) sulfate Chemical compound [Mn+2].[O-]S([O-])(=O)=O SQQMAOCOWKFBNP-UHFFFAOYSA-L 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
- 229910052984 zinc sulfide Inorganic materials 0.000 description 3
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000011260 aqueous acid Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000013065 commercial product Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005363 electrowinning Methods 0.000 description 2
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- LWUVWAREOOAHDW-UHFFFAOYSA-N lead silver Chemical compound [Ag].[Pb] LWUVWAREOOAHDW-UHFFFAOYSA-N 0.000 description 2
- 150000002697 manganese compounds Chemical class 0.000 description 2
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 150000004763 sulfides Chemical class 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 2
- 239000011686 zinc sulphate Substances 0.000 description 2
- 235000009529 zinc sulphate Nutrition 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011777 Corchorus aestuans Nutrition 0.000 description 1
- 240000000491 Corchorus aestuans Species 0.000 description 1
- 235000010862 Corchorus capsularis Nutrition 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- IKWTVSLWAPBBKU-UHFFFAOYSA-N a1010_sial Chemical compound O=[As]O[As]=O IKWTVSLWAPBBKU-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- JEMGLEPMXOIVNS-UHFFFAOYSA-N arsenic copper Chemical compound [Cu].[As] JEMGLEPMXOIVNS-UHFFFAOYSA-N 0.000 description 1
- 229910000413 arsenic oxide Inorganic materials 0.000 description 1
- 229960002594 arsenic trioxide Drugs 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010960 commercial process Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000004070 electrodeposition Methods 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical class [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 1
- RLJMLMKIBZAXJO-UHFFFAOYSA-N lead nitrate Chemical compound [O-][N+](=O)O[Pb]O[N+]([O-])=O RLJMLMKIBZAXJO-UHFFFAOYSA-N 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 150000002696 manganese Chemical class 0.000 description 1
- 229910001437 manganese ion Inorganic materials 0.000 description 1
- 229940099596 manganese sulfate Drugs 0.000 description 1
- VCTOKJRTAUILIH-UHFFFAOYSA-N manganese(2+);sulfide Chemical class [S-2].[Mn+2] VCTOKJRTAUILIH-UHFFFAOYSA-N 0.000 description 1
- 229910000473 manganese(VI) oxide Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000008247 solid mixture Substances 0.000 description 1
- 229910052950 sphalerite Inorganic materials 0.000 description 1
- CADICXFYUNYKGD-UHFFFAOYSA-N sulfanylidenemanganese Chemical compound [Mn]=S CADICXFYUNYKGD-UHFFFAOYSA-N 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229960001763 zinc sulfate Drugs 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/21—Manganese oxides
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C1/00—Electrolytic production, recovery or refining of metals by electrolysis of solutions
- C25C1/16—Electrolytic production, recovery or refining of metals by electrolysis of solutions of zinc, cadmium or mercury
-
- 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)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Electrolytic Production Of Metals (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Compounds Of Unknown Constitution (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA258,881A CA1066656A (en) | 1976-08-11 | 1976-08-11 | Electrolytic recovery of zinc and manganese dioxide |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NO772810L true NO772810L (no) | 1978-02-14 |
Family
ID=4106630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO772810A NO772810L (no) | 1976-08-11 | 1977-08-10 | Fremgangsm}te for gjenvinning av sink og mangandioksyd |
Country Status (16)
Families Citing this family (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4149945A (en) * | 1978-04-13 | 1979-04-17 | Kennecott Copper Corporation | Hydrometallurgical brass dust reclamation |
| US4149880A (en) * | 1978-07-19 | 1979-04-17 | Kennecott Copper Corporation | Recovery of copper from arsenic containing metallurgical waste materials |
| CA1141172A (en) * | 1978-12-20 | 1983-02-15 | Gerald L. Bolton | Removal of manganese ions from zinc and manganese containing solutions |
| US4274931A (en) * | 1979-01-24 | 1981-06-23 | National Institute For Metallurgy | Leaching process for zinc sulphide containing materials |
| US4330379A (en) * | 1979-01-24 | 1982-05-18 | National Institute For Metallurgy | Leaching of zinc containing sulphide minerals |
| US4225342A (en) * | 1979-09-21 | 1980-09-30 | Texasgulf Inc. | Treatment of zinc plant leach residues for recovery of the contained metal values |
| CH679158A5 (US07943777-20110517-C00090.png) * | 1989-07-20 | 1991-12-31 | Recytec S A C O Orfigest S A | |
| US5419882A (en) * | 1994-04-22 | 1995-05-30 | Noranda Inc. | Method for the removal of thallium |
| PL318754A1 (en) * | 1994-08-15 | 1997-07-07 | R & O Mining Processing Ltd | Hydrometallurgical zinc sulphite-to-sulphate comversion of zinc sulphite contained in ores and ore concentrates |
| CA2221779C (en) * | 1995-06-07 | 2004-09-28 | Cominco Ltd. | Redox control in the electrodeposition of metals |
| US5912402A (en) * | 1995-10-30 | 1999-06-15 | Drinkard Metalox, Inc. | Metallurgical dust recycle process |
| DE69710870T2 (de) * | 1997-06-20 | 2002-09-12 | Sulfacid S.A.I.F.C., Buenos Aires | Elektrolytische Gewinnung von Reinzink aus einer Mangan enthaltenden Laugungslösung durch vorhergehender Entmanganisierung der Lösung mittels kalter Elektrolyse |
| AU5050100A (en) * | 1999-05-05 | 2001-10-08 | Michael John Thom | Removal of manganese from electrolytes |
| GB0031413D0 (en) | 2000-12-21 | 2001-02-07 | Aea Technology Plc | Electrochemical processing |
| BR0212518A (pt) * | 2001-09-13 | 2004-08-24 | Intec Ltd | Processo para a recuperação de zinco metálico de um mineral de zinco, métodos para a remoção de manganês de uma solução de haleto metálico, e para remoção de prata e/ou mercúrio dissolvidos de uma solução de haleto metálico, e, qualquer metal |
| CN1321224C (zh) * | 2004-08-02 | 2007-06-13 | 西安建筑科技大学 | 废旧电池综合处理中锌和二氧化锰分离、提纯方法 |
| CN102347521A (zh) * | 2011-10-08 | 2012-02-08 | 佛山市邦普循环科技有限公司 | 一种电动汽车用动力型锰酸锂电池中锰和锂的回收方法 |
| US11430997B2 (en) | 2019-11-01 | 2022-08-30 | Battery Reclamation Research Associates Llc | Process for separating and recycling a spent alkaline battery |
| CA3177690A1 (en) * | 2020-05-07 | 2021-11-11 | Jacobus Rudolph DE WET | A method, a system, and an apparatus for preparing manganese sulfate |
| CN115369237B (zh) * | 2022-09-21 | 2023-08-22 | 云南驰宏资源综合利用有限公司 | 一种锌冶炼锰离子产耗平衡的方法 |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US556092A (en) * | 1896-03-10 | Oscar frolich | ||
| DE466279C (de) * | 1927-05-05 | 1928-10-03 | Urlyn Clifton Tainton | Verfahren zum elektrolytischen Faellen von Zink |
| US3065155A (en) * | 1960-09-02 | 1962-11-20 | Manganese Chemicals Corp | Electrolytic manganese dioxide process |
| FR1299751A (fr) * | 1961-06-30 | 1962-07-27 | Montevecchio Soc It Del Piombo | Procédé pour la production électrolytique de zinc purissime |
| FR1538886A (fr) * | 1966-10-22 | 1968-09-06 | Union Carbide Canada Ltd | Procédé électrolytique de production simultanée de bioxyde de manganèse et de zinc |
| US3438878A (en) * | 1966-10-27 | 1969-04-15 | Union Carbide Canada Ltd | Simultaneous refining of zinc and manganese dioxide |
| US3844912A (en) * | 1973-06-27 | 1974-10-29 | Mitsui Mining & Smelting Co | Process for treating electrolytic manganese dioxide |
-
1973
- 1973-08-03 PH PH20072A patent/PH13567A/en unknown
-
1976
- 1976-08-11 CA CA258,881A patent/CA1066656A/en not_active Expired
- 1976-09-17 US US05/724,423 patent/US4071421A/en not_active Expired - Lifetime
-
1977
- 1977-07-14 YU YU174677A patent/YU174677A/xx unknown
- 1977-07-15 IE IE1477/77A patent/IE45306B1/en unknown
- 1977-07-19 ZA ZA00774333A patent/ZA774333B/xx unknown
- 1977-07-28 GB GB3180077A patent/GB1525458A/en not_active Expired
- 1977-08-05 NL NL7708712A patent/NL7708712A/xx not_active Application Discontinuation
- 1977-08-08 FI FI772386A patent/FI772386A/fi not_active Application Discontinuation
- 1977-08-09 AU AU27734/77A patent/AU506037B2/en not_active Expired
- 1977-08-10 JP JP9520977A patent/JPS5321035A/ja active Pending
- 1977-08-10 NO NO772810A patent/NO772810L/no unknown
- 1977-08-10 FR FR7724648A patent/FR2361482A1/fr active Granted
- 1977-08-10 BE BE180054A patent/BE857654A/xx not_active IP Right Cessation
- 1977-08-11 ES ES461542A patent/ES461542A1/es not_active Expired
- 1977-08-11 DE DE19772736232 patent/DE2736232A1/de not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| FR2361482B1 (US07943777-20110517-C00090.png) | 1981-12-18 |
| YU174677A (en) | 1982-06-30 |
| FI772386A (US07943777-20110517-C00090.png) | 1978-02-12 |
| IE45306B1 (en) | 1982-07-28 |
| FR2361482A1 (fr) | 1978-03-10 |
| AU506037B2 (en) | 1979-12-13 |
| CA1066656A (en) | 1979-11-20 |
| JPS5321035A (en) | 1978-02-27 |
| BE857654A (fr) | 1977-12-01 |
| NL7708712A (nl) | 1978-02-14 |
| GB1525458A (en) | 1978-09-20 |
| ES461542A1 (es) | 1978-06-01 |
| ZA774333B (en) | 1978-06-28 |
| DE2736232A1 (de) | 1978-02-16 |
| IE45306L (en) | 1978-02-11 |
| AU2773477A (en) | 1979-02-15 |
| PH13567A (en) | 1980-06-26 |
| US4071421A (en) | 1978-01-31 |
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