EP0387580A1 - Mittel und Verfahren zum Entschwefeln von Metallschmelzen - Google Patents

Mittel und Verfahren zum Entschwefeln von Metallschmelzen Download PDF

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Publication number
EP0387580A1
EP0387580A1 EP90103671A EP90103671A EP0387580A1 EP 0387580 A1 EP0387580 A1 EP 0387580A1 EP 90103671 A EP90103671 A EP 90103671A EP 90103671 A EP90103671 A EP 90103671A EP 0387580 A1 EP0387580 A1 EP 0387580A1
Authority
EP
European Patent Office
Prior art keywords
cac2
weight
gas
magnesium
cao
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.)
Withdrawn
Application number
EP90103671A
Other languages
German (de)
English (en)
French (fr)
Inventor
Hermann Dr. Schrödter
Albert Braun
Harald Dr. Scholz
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
Application filed by Hoechst AG filed Critical Hoechst AG
Publication of EP0387580A1 publication Critical patent/EP0387580A1/de
Withdrawn legal-status Critical Current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

Definitions

  • the present invention relates to an agent for the desulfurization of molten metals, in particular molten iron, on the basis of CaC2-CaO crystal mixtures obtained in the melt flow and to methods for desulfurizing molten metals using this agent.
  • the agent for the desulfurization of pig iron or steel melts according to US Pat. No. 4,323,392, which contains 20 to 55% by weight of CaC2 and 45 to 80% by weight of CaO, is prepared by using a calcium carbide melt obtained in a known manner with a CaO- Content of up to 45% by weight at temperatures up to 2000 ° C, finely divided calcium oxide in a total amount of 48 to 95% by weight, based on the end product.
  • the fine-grained agent for desulfurizing molten iron according to EP-OS 226 994 essentially consists of technical calcium carbide (containing 65 to 85% by weight CaC2) and dried coal with at least 15% by weight of volatile components, the carbon content being 2 to 50% by weight. can be. Furthermore, the fine grain Some agents also contain magnesium.
  • a disadvantage of the last-mentioned fine-grained agent is that it contains a high proportion of CaC2, which has a negative effect on the economy of the desulfurization of molten iron.
  • This is achieved according to the invention in that it consists of the components CaC2-CaO crystal mixture with a maximum of 62% by weight, in particular a maximum of 60% by weight of CaC2, gas-releasing substances and 0 to 44% by weight of metallic magnesium.
  • both of these are fluidized mixture consisting of CaC2-CaO crystal mixture and gas-releasing substances as well as the magnesium separately and combines both fluidates immediately before they enter the melt or the three components CaC2-CaO crystal mixture, gas-releasing substances and magnesium are fluidized together and bring the fluidate into the Melt down. Dry air, nitrogen, noble gases or their mixtures can be used for fluidization.
  • the agent according to the invention has grain sizes of at least 90% by weight ⁇ 100 ⁇ m, preferably 85% by weight ⁇ 63 ⁇ m.
  • a flow improver 0.01 to 0.7% by weight of a flow improver can be added to the agent according to the invention.
  • a carbon dioxide-releasing substance for example dolomite or calcium carbonate, can also be added to the agent according to the invention.
  • the desulfurization effect is improved compared to the prior art when using the agent according to the invention.
  • the amount of desulphurising agent to be used per ton of pig iron melt is calculated from the initial sulfur content and the target final sulfur content in the desulfurization of pig iron melts:
  • Desulphurization agents which are known from EP-OS 226 994, were used for experiments A and C, while desulphurization agents according to the invention were used for experiments B, D, E and F. Finally, in experiment E, the desulfurization agent was introduced into the pig iron melt by co-injection of CaC2 / CaO flame-coal mixture on the one hand and magnesium on the other hand (cf. claims 7 and 9).
  • Desulphurization agents which are known from EP-OS 226 994 were used for experiments G and I, while desulphurization agents according to the invention were used for experiments H, J and K. TABLE 1 attempt Desulfurizing agent RE [t] Mean [kg / tRE] Mean [kg / min] Gas [NL / kg] S A S E B [min] K A 95% carbide ( ⁇ 65% CaC2) air 5% brown coal 135 1.95 40 7.0 0.033 0.012 6.6 4.43 B 85% CaC2 / CaO (54% CaC2) air 15% flame coal 300 2.83 70 6.8 0.037 0.008 12.1 4.25 C.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
EP90103671A 1989-03-13 1990-02-26 Mittel und Verfahren zum Entschwefeln von Metallschmelzen Withdrawn EP0387580A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3908071 1989-03-13
DE3908071A DE3908071A1 (de) 1989-03-13 1989-03-13 Mittel und verfahren zum entschwefeln von metallschmelzen

Publications (1)

Publication Number Publication Date
EP0387580A1 true EP0387580A1 (de) 1990-09-19

Family

ID=6376200

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90103671A Withdrawn EP0387580A1 (de) 1989-03-13 1990-02-26 Mittel und Verfahren zum Entschwefeln von Metallschmelzen

Country Status (9)

Country Link
US (1) US4988387A (ja)
EP (1) EP0387580A1 (ja)
JP (1) JPH02282411A (ja)
CA (1) CA2011380A1 (ja)
DD (1) DD292478A5 (ja)
DE (1) DE3908071A1 (ja)
NO (1) NO901142L (ja)
PT (1) PT93412A (ja)
ZA (1) ZA901876B (ja)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5078784A (en) * 1990-03-14 1992-01-07 Elkem Metals Company Desulfurization agent
US5149364A (en) * 1990-03-14 1992-09-22 Elkem Metals Company Desulfurization agent
US5358550A (en) * 1992-10-26 1994-10-25 Rossborough Manufacturing Company Desulfurization agent
DE4242328C2 (de) * 1992-12-15 1995-06-08 Alfred Dipl Ing Dr Freissmuth Mittel zur Entschwefelung, Entphosphorung, Entsilicierung und Entstickung von Roheisen- und Gußeisenschmelzen
AT406690B (de) * 1994-12-09 2000-07-25 Donau Chemie Ag Mittel zur behandlung von roheisen- und gusseisenschmelzen zum zweck der entschwefelung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1935567B2 (de) * 1969-07-12 1971-05-13 Knapsack AG, 5033 Hurth Knapsack Verfahren zur herstellung von calciumkarbid bestimmter qualitaet
DE2907069B2 (de) * 1979-02-23 1981-04-02 Krupp Stahl Ag, 4630 Bochum Mittel zur Entschwefelung von Metallschmelzen
EP0019087B1 (de) * 1979-05-14 1983-07-20 Hoechst Aktiengesellschaft Entschweflungsmittel für Roheisen- und Stahlschmelzen sowie ein Verfahren zu ihrer Herstellung
EP0164592A1 (de) * 1984-05-16 1985-12-18 SKW Trostberg Aktiengesellschaft Feinkörniges Entschwefelungsmittel für Eisenschmelzen und Verfahren zur Entschwefelung von Roheisenschmelzen
EP0226994A1 (de) * 1985-12-17 1987-07-01 SKW Trostberg Aktiengesellschaft Mittel zur Entschwefelung von geschmolzenem Eisen sowie Verfahren zur Herstellung des Mittels

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3885956A (en) * 1974-05-21 1975-05-27 Rheinische Kalksteinwerke Method and composition for the treatment of ferrous melts and process for making the treating composition
ES8200147A1 (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
DE3544562C2 (de) * 1985-12-17 1998-07-30 Sueddeutsche Kalkstickstoff Feinkörniges Mittel zur Entschwefelung von Eisenschmelzen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1935567B2 (de) * 1969-07-12 1971-05-13 Knapsack AG, 5033 Hurth Knapsack Verfahren zur herstellung von calciumkarbid bestimmter qualitaet
DE2907069B2 (de) * 1979-02-23 1981-04-02 Krupp Stahl Ag, 4630 Bochum Mittel zur Entschwefelung von Metallschmelzen
EP0019087B1 (de) * 1979-05-14 1983-07-20 Hoechst Aktiengesellschaft Entschweflungsmittel für Roheisen- und Stahlschmelzen sowie ein Verfahren zu ihrer Herstellung
EP0164592A1 (de) * 1984-05-16 1985-12-18 SKW Trostberg Aktiengesellschaft Feinkörniges Entschwefelungsmittel für Eisenschmelzen und Verfahren zur Entschwefelung von Roheisenschmelzen
EP0226994A1 (de) * 1985-12-17 1987-07-01 SKW Trostberg Aktiengesellschaft Mittel zur Entschwefelung von geschmolzenem Eisen sowie Verfahren zur Herstellung des Mittels

Also Published As

Publication number Publication date
NO901142D0 (no) 1990-03-12
DE3908071A1 (de) 1990-09-20
CA2011380A1 (en) 1990-09-13
JPH02282411A (ja) 1990-11-20
DD292478A5 (de) 1991-08-01
NO901142L (no) 1990-09-14
ZA901876B (en) 1990-12-28
US4988387A (en) 1991-01-29
PT93412A (pt) 1990-11-07

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