EP0019086B1 - Procédé pour la fabrication d'agents de désulfurisation de fonte ou d'acier fondus - Google Patents

Procédé pour la fabrication d'agents de désulfurisation de fonte ou d'acier fondus Download PDF

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Publication number
EP0019086B1
EP0019086B1 EP80101984A EP80101984A EP0019086B1 EP 0019086 B1 EP0019086 B1 EP 0019086B1 EP 80101984 A EP80101984 A EP 80101984A EP 80101984 A EP80101984 A EP 80101984A EP 0019086 B1 EP0019086 B1 EP 0019086B1
Authority
EP
European Patent Office
Prior art keywords
cao
weight
calcium oxide
mixture
content
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
Application number
EP80101984A
Other languages
German (de)
English (en)
Other versions
EP0019086A3 (en
EP0019086A2 (fr
Inventor
Albert Braun
Willi Dr. Portz
Georg Dr. Strauss
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hoechst AG
Original Assignee
Hoechst AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6071196&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0019086(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Hoechst AG filed Critical Hoechst AG
Priority to AT80101984T priority Critical patent/ATE2092T1/de
Publication of EP0019086A2 publication Critical patent/EP0019086A2/fr
Publication of EP0019086A3 publication Critical patent/EP0019086A3/de
Application granted granted Critical
Publication of EP0019086B1 publication Critical patent/EP0019086B1/fr
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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 method for producing desulfurizing agents based on calcium oxide-containing calcium carbide for pig iron and steel melts.
  • lime calcium carbide
  • lime calcium oxide
  • 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 dangerous, it was previously thought 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.
  • This mixture is then milled with intensive mixing and with the exclusion of moisture at temperatures above 100 ° C. to grain sizes less than 10 mm, preferably less than 10 ⁇ m, and the milled product, likewise with the exclusion of moisture, is cooled.
  • a carbide / lime starting melt mixture with a CaO content of 20 to 45% by weight which was obtained in a known manner from lime and coke by thermal means.
  • a carbide / lime starting melt mixture with a CaO content of more than 45 to 80% by weight is first produced by finely dividing into a carbide melt which has a lime content of up to 45% by weight Enter lime up to a CaO content of up to 80% by weight and only then allow the whole to solidify into a block before breaking it at temperatures above 400 ° C.
  • the process 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 is not previously adjusted to a specific grain size must be finely ground, but that it can be assumed that a carbide block whose CaC 2 : CaO weight ratio can fluctuate within a very wide range, ie 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.
  • the block 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 ground with the exclusion of moisture at a temperature of 100 ° C. to particle sizes between 0 and 100 ⁇ m, and the ground product was cooled to room temperature with the exclusion of moisture.
  • Carbide is thermally produced in a known manner from lime and coke, 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 Ca0 per 1 t tapping jet).
  • the block is pre-crushed to a grain size of less than 150 mm and as much lime with a grain size of 8-60 mm is layered on the hot mixture that the average Ca0 content is 90% by weight.
  • the mixture is then ground to a grain size of less than 100 ⁇ m with exclusion of moisture at a temperature above 100 ° C., and the ground product is cooled to room temperature with the exclusion of moisture.

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)
  • Coating With Molten Metal (AREA)

Claims (6)

1. Procédé de préparation d'agents de désulfuration 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 un mélange fondu de départ carbure de calcium/ oxyde de calcium d'une teneur en CaO comprise entre 20 et 80% en poids que l'on laisse refroidir et solidifier en bloc, en ce qu'on concasse grossièrement ensuite 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 au mélange chaud concassé et ayant encore une température d'au moins 400° C une quantité d'oxyde de calcium telle que le mélange formé ait une teneur totale en CaO correspondant à la teneur en CaO recherchée pour le produit final, en ce qu'on broie le mélange avec agitation intense à l'abri d'humidité et à des températures supérieures à 100° C à des dimensions de particules de moins de 10 mm et on laisse le produit broyé refroidir, également à l'abri d'humidité.
2. Procédé selon la revendication 1, caractérisé en ce que l'on recouvre le mélange grossièrement concassé de grosses particules de CaO d'une grosseur de 8-60 mm.
3. Procédé selon l'une des revendications 1 ou 2, caractérisé en ce que l'on recouvre le mélange grossièrement concassé avec une quantité de CaO 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 et présentant 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 ne laisse qu'ensuite solidifier le bain en un bloc.
EP80101984A 1979-05-19 1980-04-14 Procédé pour la fabrication d'agents de désulfurisation de fonte ou d'acier fondus Expired EP0019086B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80101984T ATE2092T1 (de) 1979-05-19 1980-04-14 Verfahren zur herstellung von entschweflungsmitteln fuer roheisen- oder stahlschmelzen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19792920353 DE2920353A1 (de) 1979-05-19 1979-05-19 Verfahren zur herstellung von entschweflungsmitteln fuer roheisen- oder stahlschmelzen
DE2920353 1979-05-19

Publications (3)

Publication Number Publication Date
EP0019086A2 EP0019086A2 (fr) 1980-11-26
EP0019086A3 EP0019086A3 (en) 1981-04-01
EP0019086B1 true EP0019086B1 (fr) 1982-12-22

Family

ID=6071196

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80101984A Expired EP0019086B1 (fr) 1979-05-19 1980-04-14 Procédé pour la fabrication d'agents de désulfurisation de fonte ou d'acier fondus

Country Status (9)

Country Link
US (1) US4318822A (fr)
EP (1) EP0019086B1 (fr)
JP (1) JPS55154519A (fr)
AT (1) ATE2092T1 (fr)
CA (1) CA1141965A (fr)
DE (2) DE2920353A1 (fr)
ES (1) ES8101120A1 (fr)
NO (1) NO151971C (fr)
ZA (1) ZA802943B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107344188A (zh) * 2017-07-28 2017-11-14 靖西天桂铝业有限公司 铝土矿洗选尾泥干法处置及综合利用新工艺

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2952686A1 (de) * 1979-12-29 1981-07-02 Hoechst Ag, 6230 Frankfurt Verfahren zur herstellung von entschwefelungsmitteln fuer roheisen- oder stahlschmelzen
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
DE3535280A1 (de) * 1985-10-03 1987-04-09 Hoechst Ag Entschwefelungsgemisch fuer metallschmelzen, ein verfahren zu seiner herstellung und seine verwendung
US5002733A (en) * 1989-07-26 1991-03-26 American Alloys, Inc. Silicon alloys containing calcium and method of making same
US5397379A (en) * 1993-09-22 1995-03-14 Oglebay Norton Company Process and additive for the ladle refining of steel
US6179895B1 (en) 1996-12-11 2001-01-30 Performix Technologies, Ltd. Basic tundish flux composition for steelmaking processes

Family Cites Families (7)

* Cited by examiner, † Cited by third party
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
DE2326539C3 (de) * 1973-05-24 1975-11-13 Sueddeutsche Kalkstickstoff-Werke Ag, 8223 Trostberg Verfahren zur Herstellung eines Entschwefelungsgemisches für Eisenschmelzen aus Calciumcarbid und mindestens einem wasserhaltigen Stoff
FR2290240A1 (fr) * 1974-11-06 1976-06-04 Unibra Sa Perfectionnements a la desulfuration des gaz
DE2919324A1 (de) * 1979-05-14 1980-12-04 Hoechst Ag Entschweflungsmittel fuer roheisen- und stahlschmelzen sowie ein verfahren zu ihrer herstellung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107344188A (zh) * 2017-07-28 2017-11-14 靖西天桂铝业有限公司 铝土矿洗选尾泥干法处置及综合利用新工艺

Also Published As

Publication number Publication date
NO151971B (no) 1985-04-01
JPS6353245B2 (fr) 1988-10-21
DE3061404D1 (en) 1983-01-27
NO151971C (no) 1985-07-10
NO801468L (no) 1980-11-20
CA1141965A (fr) 1983-03-01
ES491355A0 (es) 1980-12-16
EP0019086A3 (en) 1981-04-01
ES8101120A1 (es) 1980-12-16
US4318822A (en) 1982-03-09
EP0019086A2 (fr) 1980-11-26
DE2920353A1 (de) 1980-11-27
ATE2092T1 (de) 1983-01-15
ZA802943B (en) 1981-06-24
JPS55154519A (en) 1980-12-02

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