CA1288213C - Method for the obtention of special alumina from the powder produced in the calcination of metallurgical alumina - Google Patents
Method for the obtention of special alumina from the powder produced in the calcination of metallurgical aluminaInfo
- Publication number
- CA1288213C CA1288213C CA000546826A CA546826A CA1288213C CA 1288213 C CA1288213 C CA 1288213C CA 000546826 A CA000546826 A CA 000546826A CA 546826 A CA546826 A CA 546826A CA 1288213 C CA1288213 C CA 1288213C
- Authority
- CA
- Canada
- Prior art keywords
- alumina
- powder
- calcination
- special
- product
- 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 - Fee Related
Links
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 89
- 239000000843 powder Substances 0.000 title claims abstract description 57
- 238000001354 calcination Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000005406 washing Methods 0.000 claims abstract description 18
- 239000007787 solid Substances 0.000 claims abstract description 15
- 238000001914 filtration Methods 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 239000002245 particle Substances 0.000 claims description 18
- 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 15
- 239000011734 sodium Substances 0.000 claims description 15
- 229910052708 sodium Inorganic materials 0.000 claims description 15
- 238000000227 grinding Methods 0.000 claims description 7
- 150000004684 trihydrates Chemical class 0.000 claims description 7
- 238000010908 decantation Methods 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000000654 additive Substances 0.000 claims description 3
- 230000000996 additive effect Effects 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 150000004682 monohydrates Chemical class 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 14
- 230000008569 process Effects 0.000 abstract description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 11
- 229910052782 aluminium Inorganic materials 0.000 abstract description 11
- 239000006227 byproduct Substances 0.000 abstract description 7
- 238000001035 drying Methods 0.000 abstract description 2
- 206010013786 Dry skin Diseases 0.000 abstract 1
- 238000010981 drying operation Methods 0.000 abstract 1
- 238000011084 recovery Methods 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- 239000000047 product Substances 0.000 description 28
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 9
- 238000009434 installation Methods 0.000 description 7
- 239000013078 crystal Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 241000182988 Assa Species 0.000 description 3
- 238000004131 Bayer process Methods 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 229910001948 sodium oxide Inorganic materials 0.000 description 3
- 238000007669 thermal treatment Methods 0.000 description 3
- 238000011282 treatment Methods 0.000 description 3
- 244000228957 Ferula foetida Species 0.000 description 2
- 238000003556 assay Methods 0.000 description 2
- 239000003518 caustics Substances 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000029087 digestion Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012717 electrostatic precipitator Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 229910001679 gibbsite Inorganic materials 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- 229910000873 Beta-alumina solid electrolyte Inorganic materials 0.000 description 1
- 244000180577 Sambucus australis Species 0.000 description 1
- 235000018734 Sambucus australis Nutrition 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 210000003298 dental enamel Anatomy 0.000 description 1
- 230000009699 differential effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- OGFXBIXJCWAUCH-UHFFFAOYSA-N meso-secoisolariciresinol Natural products C1=2C=C(O)C(OC)=CC=2CC(CO)C(CO)C1C1=CC=C(O)C(OC)=C1 OGFXBIXJCWAUCH-UHFFFAOYSA-N 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- 238000003828 vacuum filtration Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/44—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water
- C01F7/441—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water by calcination
- C01F7/442—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water by calcination in presence of a calcination additive
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/021—After-treatment of oxides or hydroxides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/44—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water
- C01F7/441—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water by calcination
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/46—Purification of aluminium oxide, aluminium hydroxide or aluminates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/51—Particles with a specific particle size distribution
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/10—Solid density
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
- C01P2006/82—Compositional purity water content
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S423/00—Chemistry of inorganic compounds
- Y10S423/09—Reaction techniques
- Y10S423/15—Comminution
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Compositions Of Oxide Ceramics (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES8702105A ES2004759A6 (es) | 1987-07-17 | 1987-07-17 | Metodo de obtencion de alumina especial a partir del polvo producido en la calcinacion de alumina metalurgica |
| ES8702105 | 1987-07-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1288213C true CA1288213C (en) | 1991-09-03 |
Family
ID=8251798
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000546826A Expired - Fee Related CA1288213C (en) | 1987-07-17 | 1987-09-14 | Method for the obtention of special alumina from the powder produced in the calcination of metallurgical alumina |
Country Status (11)
| Country | Link |
|---|---|
| US (1) | US4797270A (en, 2012) |
| AU (1) | AU582057B2 (en, 2012) |
| BR (1) | BR8705200A (en, 2012) |
| CA (1) | CA1288213C (en, 2012) |
| DE (1) | DE3730947A1 (en, 2012) |
| ES (1) | ES2004759A6 (en, 2012) |
| FR (1) | FR2618166B1 (en, 2012) |
| GR (1) | GR871389B (en, 2012) |
| IE (1) | IE61478B1 (en, 2012) |
| IN (1) | IN168196B (en, 2012) |
| IT (1) | IT1211490B (en, 2012) |
Families Citing this family (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3809693A1 (de) * | 1988-03-23 | 1989-10-12 | Hoechst Ceram Tec Ag | Verfahren zur herstellung von keramikfoliengiessmassen fuer duennfilmschaltungen |
| WO1996036563A1 (en) * | 1995-05-17 | 1996-11-21 | Aluchem, Inc. | Method and apparatus for making high-grade alumina from low-grade aluminum oxide fines |
| US7232918B2 (en) * | 2001-11-06 | 2007-06-19 | Shell Oil Company | Catalyst composition |
| WO2000015335A1 (en) * | 1998-09-14 | 2000-03-23 | Shell Internationale Research Maatschappij B.V. | Epoxidation catalyst carrier, preparation and use thereof |
| US7232786B2 (en) | 1998-09-14 | 2007-06-19 | Shell Oil Company | Catalyst composition |
| US7504525B2 (en) * | 1998-09-14 | 2009-03-17 | Shell Oil Company | Catalyst composition |
| BR9913600A (pt) * | 1998-09-14 | 2001-05-22 | Shell Int Research | Processos para aumentar as propriedades de um veìculo para catalisador através de um tratamento, para preparar um catalisador, e para a epoxidação catalìtica de um alceno com um gás contendo oxigênio |
| ES2182684B2 (es) * | 2001-03-26 | 2004-08-01 | Universidade De Santiago De Compostela | Procedimiento de obtencion de fibras cristalinas de a-alumina (corindon) a partir de aluminio y silice (cuarzo), en atmosferas controladas conteniendo gases de metales de transicion. |
| US20040225138A1 (en) | 2003-05-07 | 2004-11-11 | Mcallister Paul Michael | Reactor system and process for the manufacture of ethylene oxide |
| RU2342993C2 (ru) | 2003-05-07 | 2009-01-10 | Шелл Интернэшнл Рисерч Маатсхаппий Б.В. | Катализаторы, содержащие серебро, получение таких катализаторов и их применение |
| US20040224841A1 (en) * | 2003-05-07 | 2004-11-11 | Marek Matusz | Silver-containing catalysts, the manufacture of such silver-containing catalysts, and the use thereof |
| TW200600190A (en) * | 2004-04-01 | 2006-01-01 | Shell Int Research | Process for preparing a silver catalyst, the catalyst, and use thereof in olefin oxidation |
| TW200613056A (en) * | 2004-04-01 | 2006-05-01 | Shell Int Research | A process for preparing a silver catalyst, the catalyst, and a use of the catalyst for olefin oxidation |
| TW200602123A (en) * | 2004-04-01 | 2006-01-16 | Shell Int Research | Process for preparing a catalyst, the catalyst, and a use of the catalyst |
| KR20070057974A (ko) * | 2004-09-24 | 2007-06-07 | 셀 인터나쵸나아레 레사아치 마아츠샤피 비이부이 | 성형 입자의 선택방법, 시스템 설치방법, 이러한시스템에서 기체성 공급원료를 반응시키는 방법, 컴퓨터프로그램 제품 및 컴퓨터 시스템 |
| CN101573180A (zh) | 2006-11-20 | 2009-11-04 | 国际壳牌研究有限公司 | 处理载体的方法、制备催化剂的方法、催化剂及催化剂的用途 |
| ES2324145B2 (es) * | 2008-11-05 | 2010-02-12 | Universidad De Oviedo | Procedimiento para la obtencion de sulfatos de aluminio, alumina abrasiva y alumbres de potasio y amonio a partir de polvos de electrofiltro de un proceso bayer. |
| EP2358637A1 (en) * | 2008-12-17 | 2011-08-24 | Evonik Degussa GmbH | Process for preparing an aluminium oxide powder having a high alpha-al2o3 content |
| CN102463141B (zh) | 2010-11-02 | 2015-05-06 | 中国石油化工股份有限公司 | 一种氧化铝载体、其制备方法、由其制成的银催化剂及其应用 |
| TWI632954B (zh) | 2013-05-16 | 2018-08-21 | 科學設計股份有限公司 | 改善環氧乙烷觸媒的催化效能之載體處理 |
| CN103435079B (zh) * | 2013-09-04 | 2015-03-18 | 化工部长沙设计研究院 | 一种含铝硅酸盐矿物低温分解生产氧化铝的工艺 |
| CN104556178B (zh) * | 2013-10-22 | 2016-03-30 | 中国石油化工股份有限公司 | 一种多晶γ-氧化铝的制备方法 |
| CN104556162B (zh) * | 2013-10-22 | 2016-04-13 | 中国石油化工股份有限公司 | 片状多晶γ-氧化铝及其制备方法 |
| CN104556177B (zh) * | 2013-10-22 | 2016-06-22 | 中国石油化工股份有限公司 | 片状纳米γ-Al2O3及其制备方法 |
| CN103641133B (zh) * | 2013-11-25 | 2015-12-02 | 天津大学 | 粉煤灰合成的方钠石沸石及方法 |
| CN104495892B (zh) * | 2014-12-06 | 2015-12-02 | 中国铝业股份有限公司 | 一种α-氧化铝微粉除硅方法 |
| CN115073147A (zh) * | 2022-06-28 | 2022-09-20 | 浙江自立新材料股份有限公司 | 一种低钠及超低钠板状烧结刚玉的制备方法 |
| CN116081663A (zh) * | 2023-01-31 | 2023-05-09 | 中铝山东新材料有限公司 | 一种低钠微晶α-氧化铝的制备方法 |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3175883A (en) * | 1961-06-05 | 1965-03-30 | Aluminium Lab Ltd | Process for reducing the soda content of alumina |
| NL293754A (en, 2012) * | 1962-06-14 | |||
| DE2816194A1 (de) * | 1978-04-14 | 1979-10-25 | Giulini Chemie | Sinteraktive und alkaliarme tonerde |
| HU185474B (en) * | 1981-11-10 | 1985-02-28 | Almasfuezitoei Timfoeldgyar | Process for preparing alpha-aluminium oxyde poor in alkali for ceramic purposes |
| DE3212297C2 (de) * | 1982-03-29 | 1984-12-13 | Schweizerische Aluminium Ag, Chippis | Verfahren zur Herstellung grobkristalliner Tonerde |
| DE3371194D1 (en) * | 1982-08-24 | 1987-06-04 | Alusuisse | Process for the preparation of crystalline aluminium oxide |
| US4634581A (en) * | 1983-08-03 | 1987-01-06 | Atlantic Richfield Company | Production of high purity alumina |
| US4568527A (en) * | 1984-11-06 | 1986-02-04 | Kaiser Aluminum & Chemical Corporation | Utilization of partially calcined alumina as precipitation aid in the Bayer process |
| US4615875A (en) * | 1986-02-03 | 1986-10-07 | Allied Corporation | Process for preparing high purity alpha-alumina |
-
1987
- 1987-07-17 ES ES8702105A patent/ES2004759A6/es not_active Expired
- 1987-09-03 US US07/092,674 patent/US4797270A/en not_active Expired - Lifetime
- 1987-09-07 GR GR871389A patent/GR871389B/el unknown
- 1987-09-08 FR FR878712448A patent/FR2618166B1/fr not_active Expired - Fee Related
- 1987-09-14 IE IE248987A patent/IE61478B1/en not_active IP Right Cessation
- 1987-09-14 CA CA000546826A patent/CA1288213C/en not_active Expired - Fee Related
- 1987-09-15 DE DE19873730947 patent/DE3730947A1/de active Granted
- 1987-09-16 IN IN811/DEL/87A patent/IN168196B/en unknown
- 1987-09-17 AU AU78485/87A patent/AU582057B2/en not_active Ceased
- 1987-09-18 BR BR8705200A patent/BR8705200A/pt not_active IP Right Cessation
- 1987-10-06 IT IT8767845A patent/IT1211490B/it active
Also Published As
| Publication number | Publication date |
|---|---|
| IT1211490B (it) | 1989-11-03 |
| IT8767845A0 (it) | 1987-10-06 |
| ES2004759A6 (es) | 1989-02-01 |
| DE3730947A1 (de) | 1989-01-26 |
| IE61478B1 (en) | 1994-11-02 |
| GR871389B (en) | 1988-01-12 |
| IE872489L (en) | 1989-01-17 |
| IN168196B (en, 2012) | 1991-02-16 |
| US4797270A (en) | 1989-01-10 |
| FR2618166A1 (fr) | 1989-01-20 |
| FR2618166B1 (fr) | 1991-07-12 |
| AU582057B2 (en) | 1989-03-09 |
| BR8705200A (pt) | 1989-02-14 |
| AU7848587A (en) | 1988-12-22 |
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