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 PDF

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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
Application number
EP80107915A
Other languages
German (de)
English (en)
Other versions
EP0031534A1 (fr
Inventor
Albert Braun
Willi Dr. Portz
Georg Dr. Strauss
Hans-Martin Dipl.-Ing. Delhey
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.)
Krupp Stahl AG
Hoechst AG
Original Assignee
Krupp Stahl AG
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
Application filed by Krupp Stahl AG, Hoechst AG filed Critical Krupp Stahl AG
Priority to AT80107915T priority Critical patent/ATE9101T1/de
Publication of EP0031534A1 publication Critical patent/EP0031534A1/fr
Application granted granted Critical
Publication of EP0031534B1 publication Critical patent/EP0031534B1/fr
Expired legal-status Critical Current

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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 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)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Manufacture And Refinement Of Metals (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.
EP80107915A 1979-12-29 1980-12-15 Procédé pour la fabrication d'agents de désulfuration de fonte ou d'acier fondus Expired EP0031534B1 (fr)

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) ES497685A0 (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)

* Cited by examiner, † Cited by third party
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
DE3111510A1 (de) * 1981-03-24 1982-10-07 Hoechst Ag, 6000 Frankfurt Entschwefelungsgemisch und verfahren zu seiner herstellung
DE3111509A1 (de) * 1981-03-24 1982-10-07 Hoechst Ag, 6000 Frankfurt Verfahren zur herstellung von entschwefelungsmitteln fuer roheisen- oder stahlschmelzen
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)

* 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
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
EP0019086A2 (fr) * 1979-05-19 1980-11-26 Hoechst Aktiengesellschaft Procédé pour la fabrication d'agents de désulfurisation de fonte ou d'acier fondus
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

Family Cites Families (3)

* Cited by examiner, † Cited by third party
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

Patent Citations (8)

* 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
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
DK151569C (da) 1988-05-30
DD155527A5 (de) 1982-06-16
ATE9101T1 (de) 1984-09-15
AU6585480A (en) 1981-07-09
ZA808064B (en) 1982-01-27
ES8200146A1 (es) 1981-11-01
IN153342B (fr) 1984-07-07
DK151569B (da) 1987-12-14
BR8008500A (pt) 1981-07-14
AU532989B2 (en) 1983-10-20
SU1269739A3 (ru) 1986-11-07
ES497685A0 (es) 1981-11-01
DK550880A (da) 1981-06-30
JPS6327406B2 (fr) 1988-06-02
PL125648B1 (en) 1983-06-30
US4368071A (en) 1983-01-11
NO153500C (no) 1986-04-02
MX154954A (es) 1988-01-14
JPS5698413A (en) 1981-08-07
DE3069043D1 (en) 1984-09-27
EP0031534A1 (fr) 1981-07-08
NO803924L (no) 1981-06-30
DE2952686A1 (de) 1981-07-02
NO153500B (no) 1985-12-23
PL228751A1 (fr) 1981-09-04

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