DE2645155C2 - Calciumfluorid-haltiges Flußmittel zur Verwendung mit Kalk und/oder Kalkstein bei der Eisenverhüttung - Google Patents
Calciumfluorid-haltiges Flußmittel zur Verwendung mit Kalk und/oder Kalkstein bei der EisenverhüttungInfo
- Publication number
- DE2645155C2 DE2645155C2 DE2645155A DE2645155A DE2645155C2 DE 2645155 C2 DE2645155 C2 DE 2645155C2 DE 2645155 A DE2645155 A DE 2645155A DE 2645155 A DE2645155 A DE 2645155A DE 2645155 C2 DE2645155 C2 DE 2645155C2
- Authority
- DE
- Germany
- Prior art keywords
- mixture
- iron
- flux
- calcium fluoride
- lime
- 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.)
- Expired
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims description 38
- 230000004907 flux Effects 0.000 title claims description 37
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 title claims description 17
- 229910001634 calcium fluoride Inorganic materials 0.000 title claims description 17
- 229910052742 iron Inorganic materials 0.000 title claims description 17
- 235000008733 Citrus aurantifolia Nutrition 0.000 title claims description 11
- 235000011941 Tilia x europaea Nutrition 0.000 title claims description 11
- 239000004571 lime Substances 0.000 title claims description 11
- 235000019738 Limestone Nutrition 0.000 title claims description 8
- 239000006028 limestone Substances 0.000 title claims description 8
- 238000003723 Smelting Methods 0.000 title description 3
- 239000000203 mixture Substances 0.000 claims description 54
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 25
- 239000002245 particle Substances 0.000 claims description 23
- 239000012535 impurity Substances 0.000 claims description 14
- 239000000945 filler Substances 0.000 claims description 10
- COHCXWLRUISKOO-UHFFFAOYSA-N [AlH3].[Ba] Chemical compound [AlH3].[Ba] COHCXWLRUISKOO-UHFFFAOYSA-N 0.000 claims description 3
- 150000004760 silicates Chemical class 0.000 claims description 3
- DNEHKUCSURWDGO-UHFFFAOYSA-N aluminum sodium Chemical compound [Na].[Al] DNEHKUCSURWDGO-UHFFFAOYSA-N 0.000 claims description 2
- IQDXNHZDRQHKEF-UHFFFAOYSA-N dialuminum;dicalcium;dioxido(oxo)silane Chemical compound [Al+3].[Al+3].[Ca+2].[Ca+2].[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O IQDXNHZDRQHKEF-UHFFFAOYSA-N 0.000 claims description 2
- 239000010436 fluorite Substances 0.000 description 24
- 239000011230 binding agent Substances 0.000 description 14
- 229910000831 Steel Inorganic materials 0.000 description 12
- 239000010959 steel Substances 0.000 description 12
- 239000002893 slag Substances 0.000 description 11
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 10
- 239000010433 feldspar Substances 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000000126 substance Substances 0.000 description 8
- 239000000292 calcium oxide Substances 0.000 description 7
- 235000012255 calcium oxide Nutrition 0.000 description 7
- 239000000470 constituent Substances 0.000 description 7
- 229910052500 inorganic mineral Inorganic materials 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 239000011707 mineral Substances 0.000 description 7
- 235000010755 mineral Nutrition 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 229910052782 aluminium Inorganic materials 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 229910001570 bauxite Inorganic materials 0.000 description 6
- 239000010434 nepheline Substances 0.000 description 6
- 229910052664 nepheline Inorganic materials 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 239000008188 pellet Substances 0.000 description 5
- 239000010435 syenite Substances 0.000 description 5
- 229910004261 CaF 2 Inorganic materials 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 230000003750 conditioning effect Effects 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 229910001018 Cast iron Inorganic materials 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 239000010459 dolomite Substances 0.000 description 3
- 229910000514 dolomite Inorganic materials 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 238000005272 metallurgy Methods 0.000 description 3
- CHWRSCGUEQEHOH-UHFFFAOYSA-N potassium oxide Chemical compound [O-2].[K+].[K+] CHWRSCGUEQEHOH-UHFFFAOYSA-N 0.000 description 3
- 229910001950 potassium oxide Inorganic materials 0.000 description 3
- -1 Aluminum silicates Chemical class 0.000 description 2
- 239000004484 Briquette Substances 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 2
- 244000078856 Prunus padus Species 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 235000013379 molasses Nutrition 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical group O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 2
- 229910001948 sodium oxide Inorganic materials 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910001141 Ductile iron Inorganic materials 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- ZXRRHFSTAFVGOC-UHFFFAOYSA-N [AlH3].[K] Chemical compound [AlH3].[K] ZXRRHFSTAFVGOC-UHFFFAOYSA-N 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910052650 alkali feldspar Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000003077 lignite Substances 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000013528 metallic particle Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/36—Processes yielding slags of special composition
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/076—Use of slags or fluxes as treating agents
-
- 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)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Manufacture And Refinement Of Metals (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/619,977 US3998624A (en) | 1975-10-06 | 1975-10-06 | Slag fluidizing agent and method of using same for iron and steel-making processes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE2645155A1 DE2645155A1 (de) | 1977-04-14 |
| DE2645155C2 true DE2645155C2 (de) | 1983-09-08 |
Family
ID=24484086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE2645155A Expired DE2645155C2 (de) | 1975-10-06 | 1976-10-06 | Calciumfluorid-haltiges Flußmittel zur Verwendung mit Kalk und/oder Kalkstein bei der Eisenverhüttung |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US3998624A (en:Method) |
| CA (1) | CA1083824A (en:Method) |
| DE (1) | DE2645155C2 (en:Method) |
| ES (1) | ES452355A1 (en:Method) |
| FR (1) | FR2327320A1 (en:Method) |
| GB (1) | GB1552662A (en:Method) |
| IT (1) | IT1068409B (en:Method) |
| MX (1) | MX144509A (en:Method) |
| NL (1) | NL171725C (en:Method) |
Families Citing this family (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1147528A (en) * | 1979-06-09 | 1983-06-07 | Seikichi Tabei | Additives for continuous casting of steel |
| JPS565910A (en) * | 1979-06-29 | 1981-01-22 | Nisshin Steel Co Ltd | Dephosphorizing method of pig iron containing chromium |
| EP0060706A1 (en) * | 1981-03-16 | 1982-09-22 | Nippon Steel Corporation | Method for removing slag on the surface of molten metal by suction |
| US4511124A (en) * | 1983-05-03 | 1985-04-16 | Lone Star Steel Company | Method and composition for fluidization of accumulated pit scrap in soaking pits |
| IT1201506B (it) * | 1985-12-03 | 1989-02-02 | Giovanni Crespi | Miscela fondente per scorie d'acciaierie in forni ad arco,forni a ossigeno tipo ld, o.b.m.,kaldo e altri similari |
| US4874428A (en) * | 1988-09-12 | 1989-10-17 | Armco Inc. | Fluidizing a lime-silica slag |
| US5284617A (en) * | 1992-09-04 | 1994-02-08 | General Motors Corporation | Process for dealuminizing molten cast iron |
| RU2192479C1 (ru) * | 2001-07-16 | 2002-11-10 | ООО "НПП "Технология" | Способ рафинирования и модифицирования железоуглеродистого расплава |
| RU2258745C1 (ru) * | 2004-07-05 | 2005-08-20 | Общество с ограниченной ответственностью "Научно-производственное малое предприятие Интермет-Сервис" | Способ рафинирования железоуглеродистого расплава |
| RU2321641C1 (ru) * | 2006-06-07 | 2008-04-10 | Общество с ограниченной ответственностью "Экологический региональный центр" | Комплексный синтетический легкоплавкий флюс для черной металлургии |
| US20080015104A1 (en) * | 2006-07-13 | 2008-01-17 | Unimin Corporation | Ultrafine nepheline syenite |
| US20080040980A1 (en) * | 2006-07-13 | 2008-02-21 | Unimin Corporation | Method of processing nepheline syenite |
| US8858699B2 (en) | 2006-07-13 | 2014-10-14 | Unimin Corporation | Ultra fine nepheline syenite powder and products for using same |
| US7757976B2 (en) * | 2007-02-07 | 2010-07-20 | Unimin Corporation | Method of processing nepheline syenite powder to produce an ultra-fine grain size product |
| RU2374327C2 (ru) * | 2007-02-26 | 2009-11-27 | Константин Николаевич Демидов | Сталеплавильный флюс и способ его получения (варианты) |
| WO2009008965A1 (en) * | 2007-07-09 | 2009-01-15 | Unimin Corporation | Nepheline syenite powder with controlled particle size and novel method of making same |
| JP5480884B2 (ja) * | 2008-04-17 | 2014-04-23 | ユニミン コーポレーション | 温熱フィルムに用いる、制御された粒径分布を有する、鉱石又は岩石マテリアルから形成される粉末 |
| RU2495133C2 (ru) * | 2011-12-14 | 2013-10-10 | Открытое акционерное общество "КАМАЗ" | Способ производства высокопрочных чугунов с шаровидным или вермикулярным графитом на основе наноструктурированного науглероживателя |
| WO2013142430A1 (en) | 2012-03-20 | 2013-09-26 | Unimin Corporation | Mineral based fillers used as a substitute for wood fillers in simulated wood products and simulated wood products containing the same |
| RU2639199C2 (ru) * | 2016-06-08 | 2017-12-20 | Федеральное государственное бюджетное учреждение науки Институт металлургии Уральского отделения Российской академии наук (ИМЕТ УрО РАН) | Способ получения синтетического флюса для сталеплавильного производства |
| KR101717738B1 (ko) * | 2016-11-25 | 2017-03-20 | 성일하이텍(주) | 저품위 동 슬러지로부터 조동 제조방법 |
| RU2746198C1 (ru) * | 2020-04-12 | 2021-04-08 | Акционерное общество "Завод алюминиевых сплавов" | Смесь алюмооксидная для разжижения металлургических шлаков |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US251570A (en) * | 1881-12-27 | Henry glass | ||
| US1890485A (en) * | 1929-11-06 | 1932-12-13 | Paul R Caruthers | Method of treating metal |
| US2694023A (en) * | 1950-04-08 | 1954-11-09 | Kellogg M W Co | Metal treating flux |
| GB808516A (en) * | 1956-04-18 | 1959-02-04 | Derbyshire Stone Ltd | Improvements in or relating to slag-forming materials for use in the melting of iron and steel |
| US3320052A (en) * | 1964-09-17 | 1967-05-16 | James J Bowden | Flux used in the making of steel |
| DE1809700B1 (de) * | 1967-11-30 | 1970-01-29 | Denain Nord Est Longwy | Metallurgisches Flussmittel und Verfahren zu dessen Herstellung |
| FR96317E (fr) * | 1968-11-21 | 1972-06-16 | Denain Anzin Mineraux S A | Fondant, en particulier pour la sidérurgie, et procédé pour sa préparation. |
| US3721547A (en) * | 1971-09-15 | 1973-03-20 | Cleveland Flux Co | Method of fluxing and fluidizing slag in a cupola |
| US3827880A (en) * | 1971-12-07 | 1974-08-06 | British Steel Corp | Inclusion of hydroboracite in additive composition and use thereof in steel refining |
| US3881917A (en) * | 1974-01-21 | 1975-05-06 | Crawford Brown Murton | Method of refining steel |
-
1975
- 1975-10-06 US US05/619,977 patent/US3998624A/en not_active Expired - Lifetime
-
1976
- 1976-10-04 CA CA262,593A patent/CA1083824A/en not_active Expired
- 1976-10-05 GB GB41329/76A patent/GB1552662A/en not_active Expired
- 1976-10-05 IT IT28019/76A patent/IT1068409B/it active
- 1976-10-06 NL NLAANVRAGE7611049,A patent/NL171725C/xx not_active IP Right Cessation
- 1976-10-06 DE DE2645155A patent/DE2645155C2/de not_active Expired
- 1976-10-06 FR FR7630123A patent/FR2327320A1/fr active Granted
- 1976-10-06 MX MX166572A patent/MX144509A/es unknown
- 1976-10-13 ES ES452355A patent/ES452355A1/es not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| ES452355A1 (es) | 1977-12-16 |
| FR2327320B1 (en:Method) | 1980-05-16 |
| US3998624A (en) | 1976-12-21 |
| FR2327320A1 (fr) | 1977-05-06 |
| CA1083824A (en) | 1980-08-19 |
| NL171725B (nl) | 1982-12-01 |
| IT1068409B (it) | 1985-03-21 |
| NL171725C (nl) | 1983-05-02 |
| GB1552662A (en) | 1979-09-19 |
| MX144509A (es) | 1981-10-22 |
| NL7611049A (nl) | 1977-04-12 |
| DE2645155A1 (de) | 1977-04-14 |
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