NO123798B - - Google Patents
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- Publication number
- NO123798B NO123798B NO3306/68A NO330668A NO123798B NO 123798 B NO123798 B NO 123798B NO 3306/68 A NO3306/68 A NO 3306/68A NO 330668 A NO330668 A NO 330668A NO 123798 B NO123798 B NO 123798B
- Authority
- NO
- Norway
- Prior art keywords
- iron
- slurry
- sulfur
- solution
- recovered
- Prior art date
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 221
- 229910052742 iron Inorganic materials 0.000 claims description 103
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 69
- 239000002002 slurry Substances 0.000 claims description 42
- 238000000034 method Methods 0.000 claims description 41
- 229910052717 sulfur Inorganic materials 0.000 claims description 34
- 239000011593 sulfur Substances 0.000 claims description 33
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims description 32
- 238000007254 oxidation reaction Methods 0.000 claims description 24
- 150000004763 sulfides Chemical class 0.000 claims description 24
- 230000003647 oxidation Effects 0.000 claims description 21
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 20
- 238000004090 dissolution Methods 0.000 claims description 20
- 239000005864 Sulphur Substances 0.000 claims description 18
- 239000007787 solid Substances 0.000 claims description 15
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical class [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 claims description 14
- 150000002506 iron compounds Chemical class 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 229910052952 pyrrhotite Inorganic materials 0.000 claims description 12
- 238000011084 recovery Methods 0.000 claims description 12
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 11
- 239000011707 mineral Substances 0.000 claims description 11
- 235000010755 mineral Nutrition 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 10
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 239000011790 ferrous sulphate Substances 0.000 claims description 8
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- 239000002244 precipitate Substances 0.000 claims description 8
- 239000005569 Iron sulphate Substances 0.000 claims description 7
- 230000007062 hydrolysis Effects 0.000 claims description 7
- 238000006460 hydrolysis reaction Methods 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 7
- -1 fatty acid ester Chemical class 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 230000001590 oxidative effect Effects 0.000 claims description 4
- 239000008188 pellet Substances 0.000 claims description 4
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 claims description 3
- 229920000084 Gum arabic Polymers 0.000 claims description 3
- 239000000205 acacia gum Substances 0.000 claims description 3
- 235000010489 acacia gum Nutrition 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 3
- 150000002736 metal compounds Chemical class 0.000 claims description 3
- 239000012736 aqueous medium Substances 0.000 claims description 2
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 2
- 239000000194 fatty acid Substances 0.000 claims description 2
- 229930195729 fatty acid Natural products 0.000 claims description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 239000004094 surface-active agent Substances 0.000 claims description 2
- 241000978776 Senegalia senegal Species 0.000 claims 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 22
- 229910052751 metal Inorganic materials 0.000 description 22
- 239000002184 metal Substances 0.000 description 22
- 150000002739 metals Chemical class 0.000 description 19
- 239000010949 copper Substances 0.000 description 15
- 229910052802 copper Inorganic materials 0.000 description 14
- 229910052759 nickel Inorganic materials 0.000 description 13
- 239000000047 product Substances 0.000 description 13
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 13
- 239000011701 zinc Substances 0.000 description 13
- 229910052683 pyrite Inorganic materials 0.000 description 12
- 239000011028 pyrite Substances 0.000 description 12
- 229910052725 zinc Inorganic materials 0.000 description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 9
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 9
- 229910017052 cobalt Inorganic materials 0.000 description 8
- 239000010941 cobalt Substances 0.000 description 8
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 8
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 7
- 239000006227 byproduct Substances 0.000 description 7
- 239000012535 impurity Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 239000010970 precious metal Substances 0.000 description 7
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 6
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 6
- 238000001914 filtration Methods 0.000 description 6
- 229910021653 sulphate ion Inorganic materials 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 4
- 239000012141 concentrate Substances 0.000 description 4
- 239000008187 granular material Substances 0.000 description 4
- 238000002386 leaching Methods 0.000 description 4
- 239000011669 selenium Substances 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 4
- 238000005979 thermal decomposition reaction Methods 0.000 description 4
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 229910052785 arsenic Inorganic materials 0.000 description 3
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 3
- 238000001354 calcination Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005469 granulation Methods 0.000 description 3
- 230000003179 granulation Effects 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 229910052711 selenium Inorganic materials 0.000 description 3
- 239000007858 starting material Substances 0.000 description 3
- CXWXQJXEFPUFDZ-UHFFFAOYSA-N tetralin Chemical compound C1=CC=C2CCCCC2=C1 CXWXQJXEFPUFDZ-UHFFFAOYSA-N 0.000 description 3
- RFFLAFLAYFXFSW-UHFFFAOYSA-N 1,2-dichlorobenzene Chemical compound ClC1=CC=CC=C1Cl RFFLAFLAYFXFSW-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 239000011260 aqueous acid Substances 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000010960 commercial process Methods 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 238000009854 hydrometallurgy Methods 0.000 description 2
- LDHBWEYLDHLIBQ-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide;hydrate Chemical compound O.[OH-].[O-2].[Fe+3] LDHBWEYLDHLIBQ-UHFFFAOYSA-M 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000007669 thermal treatment Methods 0.000 description 2
- PAAZPARNPHGIKF-UHFFFAOYSA-N 1,2-dibromoethane Chemical compound BrCCBr PAAZPARNPHGIKF-UHFFFAOYSA-N 0.000 description 1
- 244000215068 Acacia senegal Species 0.000 description 1
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229910005432 FeSx Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 239000001099 ammonium carbonate Substances 0.000 description 1
- 235000012501 ammonium carbonate Nutrition 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000002198 insoluble material Substances 0.000 description 1
- GDPKWKCLDUOTMP-UHFFFAOYSA-B iron(3+);dihydroxide;pentasulfate Chemical compound [OH-].[OH-].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O GDPKWKCLDUOTMP-UHFFFAOYSA-B 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical group [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 1
- 239000002912 waste gas Substances 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
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/11—Removing sulfur, phosphorus or arsenic other than by roasting
-
- 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
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
-
- 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
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
-
- 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
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Compounds Of Iron (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA998676 | 1967-08-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NO123798B true NO123798B (xx) | 1972-01-17 |
Family
ID=4143012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO3306/68A NO123798B (xx) | 1967-08-25 | 1968-08-23 |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US3529957A (xx) |
| BE (1) | BE719910A (xx) |
| ES (1) | ES357528A1 (xx) |
| FI (1) | FI47780C (xx) |
| FR (1) | FR1579191A (xx) |
| GB (1) | GB1224247A (xx) |
| NO (1) | NO123798B (xx) |
| SE (1) | SE346294B (xx) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3642435A (en) * | 1969-11-10 | 1972-02-15 | Cyprus Mines Corp | Method of recovering water-soluble nonferrous metal sulfates from sulfur-bearing ores |
| US3964901A (en) * | 1973-10-19 | 1976-06-22 | Sherritt Gordon Mines Limited | Production of copper and sulfur from copper-iron sulfides |
| DE2614260C3 (de) * | 1976-04-02 | 1979-03-22 | Hoechst Ag, 6000 Frankfurt | Verfahren zum Konzentrieren und Entwässern von Mineralsuspensionen und Filterhilfsmittel |
| US4168969A (en) * | 1978-04-17 | 1979-09-25 | Texasgulf Inc. | Recovery of silver, copper, zinc and lead from partially roasted pyrite concentrate by acid chloride leaching |
| US4177067A (en) * | 1978-04-17 | 1979-12-04 | Texasgulf Inc. | Recovery of silver, copper and zinc from partially roasted pyrite concentrate by ferric sulphate leaching |
| ZW3481A1 (en) * | 1980-02-18 | 1981-05-20 | Nat Inst Metallurg | The leaching of sulphidic mattes containing non-ferrous metals and iron |
| FI69621C (fi) * | 1984-06-27 | 1986-03-10 | Outokumpu Oy | Foerfarande foer avlaegsning och tillvaratagande av svavel somgrundaemnessvavel fraon svaveldioxid- eller svaveldioxid hocsvavelvaetehaltiga gaser |
| FR2597464B1 (fr) * | 1986-04-17 | 1988-07-29 | Elf Aquitaine | Procede de recuperation du soufre de minerais renfermant des pyrites |
| FR2597466B1 (fr) * | 1986-04-17 | 1988-07-29 | Elf Aquitaine | Procede d'obtention de soufre elementaire a partir d'un minerai de sulfure de fer |
| FR2597467B1 (fr) * | 1986-04-17 | 1988-07-29 | Elf Aquitaine | Perfectionnement a l'extraction du soufre de minerais de fer traites par lixiviation oxydante |
| US4814158A (en) * | 1988-01-28 | 1989-03-21 | Fini Enterprises, Inc. | Process for making liquid ferric sulfate |
| US5227032A (en) * | 1991-09-24 | 1993-07-13 | The United State Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Method for producing oxygen from lunar materials |
| AUPN498595A0 (en) * | 1995-08-23 | 1995-09-14 | International Water Solutions Corporation | Extraction of valuable metals |
| CN103993172B (zh) * | 2014-05-23 | 2016-11-02 | 中国恩菲工程技术有限公司 | 含铁溶液的处理方法 |
| AU2018315046B9 (en) * | 2017-08-08 | 2022-07-28 | Cobalt Blue Holdings Ltd | Recovery of metals from pyrite |
| CN114835088B (zh) * | 2022-03-21 | 2023-07-18 | 中南大学 | 一种黄铁矿热解-氧压浸出制备硫磺和铁精粉的方法 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2130278A (en) * | 1934-09-01 | 1938-09-13 | Harmon E Keyes | Leaching-precipitation-flotation process |
| US3088820A (en) * | 1959-05-18 | 1963-05-07 | Sherritt Gordon Mines Ltd | Process for the recovery of metal values from low grade materials |
-
1968
- 1968-02-09 US US704298A patent/US3529957A/en not_active Expired - Lifetime
- 1968-08-14 GB GB38887/68A patent/GB1224247A/en not_active Expired
- 1968-08-16 SE SE11038/68A patent/SE346294B/xx unknown
- 1968-08-23 FR FR1579191D patent/FR1579191A/fr not_active Expired
- 1968-08-23 FI FI682378A patent/FI47780C/fi active
- 1968-08-23 NO NO3306/68A patent/NO123798B/no unknown
- 1968-08-23 BE BE719910D patent/BE719910A/xx unknown
- 1968-08-24 ES ES357528A patent/ES357528A1/es not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| SE346294B (xx) | 1972-07-03 |
| GB1224247A (en) | 1971-03-03 |
| BE719910A (xx) | 1969-02-03 |
| DE1792335B2 (de) | 1976-07-22 |
| FI47780B (xx) | 1973-11-30 |
| US3529957A (en) | 1970-09-22 |
| FI47780C (fi) | 1974-03-11 |
| ES357528A1 (es) | 1970-03-16 |
| FR1579191A (xx) | 1969-08-22 |
| DE1792335A1 (de) | 1971-10-28 |
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