EP0031534B1 - Procédé pour la fabrication d'agents de désulfuration de fonte ou d'acier fondus - Google Patents
Procédé pour la fabrication d'agents de désulfuration de fonte ou d'acier fondus Download PDFInfo
- Publication number
- EP0031534B1 EP0031534B1 EP80107915A EP80107915A EP0031534B1 EP 0031534 B1 EP0031534 B1 EP 0031534B1 EP 80107915 A EP80107915 A EP 80107915A EP 80107915 A EP80107915 A EP 80107915A EP 0031534 B1 EP0031534 B1 EP 0031534B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mixture
- weight
- cao
- calcium oxide
- size
- 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
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 11
- 239000000161 steel melt Substances 0.000 title claims abstract description 6
- 230000003009 desulfurizing effect Effects 0.000 title claims abstract description 5
- 229910000805 Pig iron Inorganic materials 0.000 title description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000000292 calcium oxide Substances 0.000 claims abstract description 51
- 239000000203 mixture Substances 0.000 claims abstract description 32
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000005997 Calcium carbide Substances 0.000 claims abstract description 13
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000002245 particle Substances 0.000 claims abstract description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000004519 manufacturing process Methods 0.000 claims abstract description 5
- 239000007795 chemical reaction product Substances 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052742 iron Inorganic materials 0.000 claims abstract description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 16
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 16
- 239000004571 lime Substances 0.000 claims description 16
- 239000000571 coke Substances 0.000 claims description 7
- 238000007711 solidification Methods 0.000 claims description 2
- 230000008023 solidification Effects 0.000 claims description 2
- 238000013019 agitation Methods 0.000 claims 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims 1
- 238000007669 thermal treatment Methods 0.000 claims 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 2
- 238000006477 desulfuration reaction Methods 0.000 description 7
- 230000023556 desulfurization Effects 0.000 description 7
- 239000011575 calcium Substances 0.000 description 6
- 239000000155 melt Substances 0.000 description 6
- 239000012803 melt mixture Substances 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 238000010079 rubber tapping Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000008240 homogeneous mixture Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
- C21C1/025—Agents used for dephosphorising or desulfurising
-
- 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
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
Definitions
- the present invention relates to a process for the production of desulfurization agents based on calcium oxide-containing calcium carbide for pig iron or steel melts.
- a calcium carbide-calcium oxide melt mixture with a CaO content of 20 to 80% by weight is first produced from lime and coke, which is allowed to solidify to form a block. While the solidified block still has an average temperature of more than 400 ° C, it is broken down to a grain size of less than 150 mm and calcium oxide is added to the crushed mixture, which is still at least 400 ° C, in such an amount that it can be found in the The resulting total CaO content corresponds to the desired CaO content in the end product.
- the mixture is then ground with intensive mixing and exclusion of moisture at temperatures above 100 ° C to grain sizes smaller than 10 mm.
- the finely divided lime was preferably introduced into the jet of carbide tapped from the furnace. Although the amount of lime that can be introduced into the molten carbide is limited and working with liquid carbide is associated with dangers, it was previously believed in specialist circles that this method could not be dispensed with because it was believed that only a mixture of CaC produced in the melt 2 and CaO are best suited for the desulfurization of metal melts.
- Desulphurization agents based on calcium carbide which contain substances which release water at the temperature of the molten metal, are already known from DE-B2-22 52 795.
- These agents which are mixtures of commercially available carbide with, for example, Ca (OHh as a water-releasing substance, have the disadvantage that they are mixtures produced by mechanical mixing, in which carbide particles are present separately from Ca (OH) 2 particles, which is the case when these products are used leads to a higher consumption, uneven and violent gas reactions and a large spread regarding the desulfurization effect, which makes a targeted use of these agents difficult.
- the mixture is then mixed vigorously and in the presence of air or nitrogen with a moisture content of 5 to 20 g / m 3 (at 1.013 bar and 273.15 K) at temperatures below 100 ° C., preferably at 10-15 ° C. , ground to grain sizes less than 10 mm, preferably less than 100 1 1m.
- a calcium carbide-calcium oxide starting melt mixture with a CaO content of 20 to 45% by weight which was obtained in a known manner from lime and coke in a thermal manner.
- a calcium carbide-calcium oxide starting melt mixture with a CaO content of over 45 to 80% by weight is first produced by adding finely divided calcium oxide to an existing calcium carbide melt which has a calcium oxide content of up to 45% by weight to a CaO content of up to 80% by weight and only then solidify the whole into a block before breaking it at temperatures above 400 ° C.
- the method according to the invention also has the further advantages, inter alia, that a certain Möller composition is not set in each case to produce the carbide melt, and that the lime does not previously have a specific grain size must be finely ground, but that it can be assumed that a carbide block whose CaC 2 : CaO weight ratio fluctuates within a very wide range, that is to say can be practically arbitrary, and the lime also in coarse-grained form, for example in a grain size between 8 and 60 mm, can be used.
- a further advantage of the inventive agent prepared is that densely present on the surface of each grain Ca (OH) 2 addition CaC 2, is set very early and uniformly in motion whereby the desulfurizing reaction. As a result, ver Similar desulfurization results require smaller amounts of the desulfurization agent and enables more targeted results.
- a carbide block of corresponding composition was produced in a crucible in a known manner by allowing this melt to cool. After the block had cooled to an average temperature of about 600 ° C, it was crushed to grain sizes smaller than 150 mm and the carbide, which was still 500 ° C, was covered with so much lime with a grain size of 8 to 60 mm that the resulting mixture contained a total CaO content of 50% by weight.
- the mixture was then passed through to a particle size between 0 and 100 1 while passing 1500 m 3 / h of air with a moisture content of 10 g / m 3 (at 15 ° C) in a rotary mill with a throughput of 500 kg / h at 50 ° C Ground 1m.
- Calcium carbide is produced thermally from lime and coke in a known manner, the lime-coke mixture in the entire Möller being adjusted to a weight ratio of approximately 110:40, which corresponds to a carbide with a CaO content of approximately 45% by weight.
- CaO with a grain size of 3-8 mm is added to the tapping jet of this carbide in such an amount that an average content of approx. 80% by weight CaO results in the tapping crucible (about 1.2-1.3 t CaO per tonne of tapping jet).
- the block is pre-broken to a grain size of less than 150 mm and as much lime with a grain size of 8 to 60 mm is layered on the hot mixture that the average CaO content is 90% by weight.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Carbon And Carbon Compounds (AREA)
- Coating With Molten Metal (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
- Glass Compositions (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Claims (8)
1. Procédé de préparation d'agents de désulfuration d'une teneur en eau chimiquement liée de 1-6% en poids à base de carbure de calcium contenant de l'oxyde de calcium pour bains de fonte brute et d'acier, caractérisé en ce que l'on prépare d'abord à partir de chaux et de coke un mélange fondu carbure de calcium/oxyde de calcium d'une teneur en CaO de 20-80% en poids, que l'on laisse refroidir et solidifier en bloc; en ce que l'on concasse grossièrement ce bloc solidifié pendant qu'il est encore à une température moyenne de plus de 400°C en morceaux de moins de 150 mm et on ajoute sur le mélange chaud concassé et ayant encore une température d'au moins 400°C de l'oxyde de calcium en quantité telle que le mélange formé ait une teneur totale en CaO correspondant à la teneur en CaO recherchée pour le produitfinal, on broie ensuite le mélange avec agitation intense et en présence d'air ou d'azote d'une teneur en humidité de 5-20 g/m3 (à 1,013 bar et 273,15 K) à des températures inférieures à 100°C jusqu'à des dimensions de particules de moins de 10 mm.
2. Procédé selon la revendication 1, caractérisé en ce que l'on recouvre le mélange grossièrement concassé par du CaO en grosses particules d'une grosseur de 8-60 mm.
3. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'on recouvre le mélange grossièrement concassé avec du CaO en quantité telle que le mélange formé contienne plus de 45 jusqu'à 90% en poids de CaO.
4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que l'on effectue le concassage grossier à des températures comprises entre 400°C et la température de solidification.
5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que l'on prépare de manière connue par voie thermique à partir de chaux et de coke le mélange fondu de départ carbure de calcium/oxyde de calcium d'une teneur en CaO de 20-45% en poids.
6. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que l'on prépare le mélange fondu de départ carbure de calcium/oxyde de calcium d'une teneur en CaO supérieure à 45 jusqu'à 80% en poids en introduisant dans un bain de carbure de calcium existant, d'une teneur en oxyde de calcium allant jusqu'à 45% en poids, de fines particules d'oxyde de calcium jusqu'à une teneur en CaO de 80% en poids au maximum et on laisse ensuite seulement solidifier le bain en un bloc.
7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce que l'on broie le mélange à 10-50°C en particules d'une grosseur inférieure à 10mm.
8. Procédé selon l'une des revendications 1 à 7, caractérisé en ce que l'on broie le mélange en particules d'une granulométrie inférieure à 100 I1m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT80107915T ATE9101T1 (de) | 1979-12-29 | 1980-12-15 | Verfahren zur herstellung von entschwefelungsmitteln fuer roheisen-oder stahlschmelzen. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2952686 | 1979-12-29 | ||
| DE19792952686 DE2952686A1 (de) | 1979-12-29 | 1979-12-29 | Verfahren zur herstellung von entschwefelungsmitteln fuer roheisen- oder stahlschmelzen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0031534A1 EP0031534A1 (fr) | 1981-07-08 |
| EP0031534B1 true EP0031534B1 (fr) | 1984-08-22 |
Family
ID=6089830
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP80107915A Expired EP0031534B1 (fr) | 1979-12-29 | 1980-12-15 | Procédé pour la fabrication d'agents de désulfuration de fonte ou d'acier fondus |
Country Status (16)
| Country | Link |
|---|---|
| US (1) | US4368071A (fr) |
| EP (1) | EP0031534B1 (fr) |
| JP (1) | JPS5698413A (fr) |
| AT (1) | ATE9101T1 (fr) |
| AU (1) | AU532989B2 (fr) |
| BR (1) | BR8008500A (fr) |
| DD (1) | DD155527A5 (fr) |
| DE (2) | DE2952686A1 (fr) |
| DK (1) | DK151569C (fr) |
| ES (1) | ES8200146A1 (fr) |
| IN (1) | IN153342B (fr) |
| MX (1) | MX154954A (fr) |
| NO (1) | NO153500C (fr) |
| PL (1) | PL125648B1 (fr) |
| SU (1) | SU1269739A3 (fr) |
| ZA (1) | ZA808064B (fr) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES497686A0 (es) * | 1979-12-29 | 1981-11-01 | Hoechst Ag | Procedimiento para la preparacion de un agente para la de- sulfuracion de masas fundidas metalicas |
| DE3111509A1 (de) * | 1981-03-24 | 1982-10-07 | Hoechst Ag, 6000 Frankfurt | Verfahren zur herstellung von entschwefelungsmitteln fuer roheisen- oder stahlschmelzen |
| DE3111510A1 (de) * | 1981-03-24 | 1982-10-07 | Hoechst Ag, 6000 Frankfurt | Entschwefelungsgemisch und verfahren zu seiner herstellung |
| CA1243646A (fr) * | 1984-12-04 | 1988-10-25 | William K. Kodatsky | Methode de traitement des reactifs de desulfuration a base de carbure, a injecter dans le fer en fusion |
| PL213251B1 (pl) | 2009-02-02 | 2013-02-28 | Akad Gorniczo Hutnicza | Sposób wytwarzania mieszanki zuzlotwórczej dla pozapiecowej rafinacji stali w kadzi lub w piecu kadziowym |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT264560B (de) * | 1966-08-25 | 1968-09-10 | Gustav Dipl Ing Wolfram | Basisches Stahlherstellungsverfahren |
| DE1935567B2 (de) * | 1969-07-12 | 1971-05-13 | Knapsack AG, 5033 Hurth Knapsack | Verfahren zur herstellung von calciumkarbid bestimmter qualitaet |
| DE2326539B2 (de) * | 1973-05-24 | 1975-03-27 | Sueddeutsche Kalkstickstoff-Werke Ag, 8223 Trostberg | Verfahren zur Herstellung eines Entschwefelungsgemisches für Eisenschmelzen aus Calciumcarbid und mindestens einem wasserhaltigen Stoff |
| DE1919414B2 (de) * | 1969-04-17 | 1977-07-14 | Hoechst Ag, 6000 Frankfurt | Verfahren und vorrichtung zum abkuehlen von in gefaesse abgestochenem calciumcarbid |
| DE2037758C3 (de) * | 1970-07-30 | 1979-08-02 | Hoechst Ag, 6000 Frankfurt | Verfahren zur Herstellung von CaIciumkarbid zur Entschwefelung von Metallschmelzen |
| DE2907069A1 (de) * | 1979-02-23 | 1980-08-28 | Krupp Ag Huettenwerke | Mittel zur entschwefelung von metallschmelzen |
| EP0019087A1 (fr) * | 1979-05-14 | 1980-11-26 | Hoechst Aktiengesellschaft | Matières de désulfuration pour bains de fonte et d'acier ainsi que procédé pour leur fabrication |
| EP0019086A2 (fr) * | 1979-05-19 | 1980-11-26 | Hoechst Aktiengesellschaft | Procédé pour la fabrication d'agents de désulfurisation de fonte ou d'acier fondus |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1758250B1 (de) * | 1968-04-29 | 1971-10-28 | Sueddeutsche Kalkstickstoff | Mittel zum Entschwefeln von Eisenschmelzen |
| DE2252795C3 (de) * | 1972-10-27 | 1982-09-09 | Skw Trostberg Ag, 8223 Trostberg | Entschwefelungsmittel für Roheisen- und Ferrolegierungsschmelzen |
| FR2432550A1 (fr) * | 1978-08-04 | 1980-02-29 | Sueddeutsche Kalkstickstoff | Procede pour la fabrication d'un melange de desulfuration pulverulent facilement fluidifiable |
-
1979
- 1979-12-29 DE DE19792952686 patent/DE2952686A1/de not_active Withdrawn
-
1980
- 1980-12-12 ES ES497685A patent/ES8200146A1/es not_active Expired
- 1980-12-15 AT AT80107915T patent/ATE9101T1/de not_active IP Right Cessation
- 1980-12-15 DE DE8080107915T patent/DE3069043D1/de not_active Expired
- 1980-12-15 EP EP80107915A patent/EP0031534B1/fr not_active Expired
- 1980-12-23 NO NO803924A patent/NO153500C/no unknown
- 1980-12-23 PL PL1980228751A patent/PL125648B1/pl unknown
- 1980-12-23 DK DK550880A patent/DK151569C/da not_active IP Right Cessation
- 1980-12-23 IN IN1420/CAL/80A patent/IN153342B/en unknown
- 1980-12-23 BR BR8008500A patent/BR8008500A/pt unknown
- 1980-12-24 AU AU65854/80A patent/AU532989B2/en not_active Ceased
- 1980-12-26 JP JP18417880A patent/JPS5698413A/ja active Granted
- 1980-12-26 SU SU803221904A patent/SU1269739A3/ru active
- 1980-12-29 DD DD80226699A patent/DD155527A5/de not_active IP Right Cessation
- 1980-12-29 ZA ZA00808064A patent/ZA808064B/xx unknown
-
1981
- 1981-01-02 US US06/222,086 patent/US4368071A/en not_active Expired - Fee Related
- 1981-01-05 MX MX185478A patent/MX154954A/es unknown
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT264560B (de) * | 1966-08-25 | 1968-09-10 | Gustav Dipl Ing Wolfram | Basisches Stahlherstellungsverfahren |
| DE1919414B2 (de) * | 1969-04-17 | 1977-07-14 | Hoechst Ag, 6000 Frankfurt | Verfahren und vorrichtung zum abkuehlen von in gefaesse abgestochenem calciumcarbid |
| DE1935567B2 (de) * | 1969-07-12 | 1971-05-13 | Knapsack AG, 5033 Hurth Knapsack | Verfahren zur herstellung von calciumkarbid bestimmter qualitaet |
| DE2037758C3 (de) * | 1970-07-30 | 1979-08-02 | Hoechst Ag, 6000 Frankfurt | Verfahren zur Herstellung von CaIciumkarbid zur Entschwefelung von Metallschmelzen |
| DE2326539B2 (de) * | 1973-05-24 | 1975-03-27 | Sueddeutsche Kalkstickstoff-Werke Ag, 8223 Trostberg | Verfahren zur Herstellung eines Entschwefelungsgemisches für Eisenschmelzen aus Calciumcarbid und mindestens einem wasserhaltigen Stoff |
| DE2907069A1 (de) * | 1979-02-23 | 1980-08-28 | Krupp Ag Huettenwerke | Mittel zur entschwefelung von metallschmelzen |
| EP0019087A1 (fr) * | 1979-05-14 | 1980-11-26 | Hoechst Aktiengesellschaft | Matières de désulfuration pour bains de fonte et d'acier ainsi que procédé pour leur fabrication |
| EP0019086A2 (fr) * | 1979-05-19 | 1980-11-26 | Hoechst Aktiengesellschaft | Procédé pour la fabrication d'agents de désulfurisation de fonte ou d'acier fondus |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2952686A1 (de) | 1981-07-02 |
| ATE9101T1 (de) | 1984-09-15 |
| EP0031534A1 (fr) | 1981-07-08 |
| IN153342B (fr) | 1984-07-07 |
| NO153500C (no) | 1986-04-02 |
| DK550880A (da) | 1981-06-30 |
| AU532989B2 (en) | 1983-10-20 |
| PL125648B1 (en) | 1983-06-30 |
| NO803924L (no) | 1981-06-30 |
| ES497685A0 (es) | 1981-11-01 |
| DD155527A5 (de) | 1982-06-16 |
| BR8008500A (pt) | 1981-07-14 |
| AU6585480A (en) | 1981-07-09 |
| NO153500B (no) | 1985-12-23 |
| MX154954A (es) | 1988-01-14 |
| SU1269739A3 (ru) | 1986-11-07 |
| PL228751A1 (fr) | 1981-09-04 |
| JPS6327406B2 (fr) | 1988-06-02 |
| DE3069043D1 (en) | 1984-09-27 |
| DK151569B (da) | 1987-12-14 |
| ZA808064B (en) | 1982-01-27 |
| JPS5698413A (en) | 1981-08-07 |
| ES8200146A1 (es) | 1981-11-01 |
| US4368071A (en) | 1983-01-11 |
| DK151569C (da) | 1988-05-30 |
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