EP0042033A1 - Agent de désulfuration - Google Patents

Agent de désulfuration Download PDF

Info

Publication number
EP0042033A1
EP0042033A1 EP81101764A EP81101764A EP0042033A1 EP 0042033 A1 EP0042033 A1 EP 0042033A1 EP 81101764 A EP81101764 A EP 81101764A EP 81101764 A EP81101764 A EP 81101764A EP 0042033 A1 EP0042033 A1 EP 0042033A1
Authority
EP
European Patent Office
Prior art keywords
diamide lime
diamide
lime
calcium carbide
desulfurization
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.)
Granted
Application number
EP81101764A
Other languages
German (de)
English (en)
Other versions
EP0042033B1 (fr
Inventor
Alfred Dr. Freissmuth
Werner Dr. Gmöhling
Walter Meichsner
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.)
Evonik Operations GmbH
Original Assignee
SKW Trostberg 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 SKW Trostberg AG filed Critical SKW Trostberg AG
Priority to AT81101764T priority Critical patent/ATE13694T1/de
Publication of EP0042033A1 publication Critical patent/EP0042033A1/fr
Application granted granted Critical
Publication of EP0042033B1 publication Critical patent/EP0042033B1/fr
Expired legal-status Critical Current

Links

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
    • 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
    • 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

  • this object is achieved by a desulfurization agent based on calcium carbide and.
  • Diamide lime characterized in that it contains a diamide lime aftertreated by flotation or wind sifting.
  • Diamide lime is essentially a mixture of calcium carbonate and carbon. Such mixtures occur, for example, in the case of dicyandiamide products, in the course of which aqueous calcium cyanamide suspensions are treated with carbon dioxide, and then contain about 70 to 85% calcium carbonate and about 8 to 12% carbon in addition to impurities, in particular iron oxide, aluminum oxide and silicon dioxide.
  • the precipitated diamide lime is either subjected to flotation or else first dried and then subjected to an air screening process.
  • the flotation and the wind sifting can be carried out in a known manner and with the usual equipment (see, for example, Ullmann's Encyklo ubendie der Technischen Chemie, Verlag Chemie, Weinheim, 4th edition, volume 2, pages 110 to 142 and 57 to 69).
  • the post-treated diamide lime contains about 17 to 36% CO 2 corresponding to 38 to 82% calcium carbonate, 18 to 55% free carbon and about 5 to 10% residual impurities such as calcium oxide, calcium hydroxide, iron oxide, aluminum oxide and silicon dioxide .
  • a post-treated diamide lime can also be mixed with an untreated diamide lime, for example in a weight ratio of 50/50, and this "waste" can be used to produce the mixture according to the invention.
  • a diamide lime with 18 to 40%, in particular 25 to 30%, free carbon is preferably used.
  • Such diamide lime has, for example, the following analytical values: 25 to 30% free carbon, 28 to 30% CO 2 corresponding to 64 to 68% calcium carbonate, and 5 to 10% calcium oxide, calcium hydroxide and impurities such as iron oxide, aluminum oxide and silicon dioxide.
  • the aftertreatment enriches in particular the carbon content, the calcium carbonate particles adhering to the carbon and the very fine content of the diamide lime. While the untreated diamide lime has an average particle size of approx. 35 ⁇ m, where 10%> approx. 75 ⁇ m and 10% ⁇ approx. 10 ⁇ m, these data have been shifted to significantly smaller particle sizes for the after-treated diamide lime: the average particle size of an after-treated diamide lime with about 40% carbon is only 5 ⁇ m, with 10% above about 15 ⁇ m and 10% below about 2 ⁇ m. Depending on the intensity of the after-treatment, these values can be shifted up or down.
  • the desulfurization mixtures according to the invention are prepared by combining calcium carbide with the dried post-treated diamide lime together in a mill, e.g. in a tube mill, ground.
  • the grinding process in particular the duration of the grinding, is of course of great importance for the production of a mixture which is optimal with regard to flowability and desulfurization.
  • the minimum grinding time is usually about 5 minutes, and the time required to achieve optimal results is usually between 10 and 30 minutes.
  • the mixture according to the invention can also contain other conventional additives, such as e.g. finely divided silicon dioxide to further improve the flowability, or else additions of carbon, e.g. in the form of fatty, hard or flame coal, anthracite, and in particular in the form of graphite.
  • additives such as e.g. finely divided silicon dioxide to further improve the flowability, or else additions of carbon, e.g. in the form of fatty, hard or flame coal, anthracite, and in particular in the form of graphite.
  • the application therefore also relates to the use of the agents according to the invention for the desulfurization of molten iron, such as pig iron, cast iron and steel melts.
  • the post-treated diamide lime used in mixture 4) has the following analysis values: 25% free carbon, 30% CO 2 corresponding to 68% calcium carbonate and 7% calcium oxide, calcium hydroxide and impurities such as iron oxide, aluminum oxide and silicon dioxide. Average particle size 15 ⁇ m, 10%> 35 ⁇ m, 10% ⁇ 5 ⁇ m.,

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)
  • Treating Waste Gases (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Processing Of Solid Wastes (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
EP81101764A 1980-06-18 1981-03-10 Agent de désulfuration Expired EP0042033B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81101764T ATE13694T1 (de) 1980-06-18 1981-03-10 Entschwefelungsmittel.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19803022752 DE3022752A1 (de) 1980-06-18 1980-06-18 Entschwefelungsmittel
DE3022752 1980-06-18

Publications (2)

Publication Number Publication Date
EP0042033A1 true EP0042033A1 (fr) 1981-12-23
EP0042033B1 EP0042033B1 (fr) 1985-06-05

Family

ID=6104856

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81101764A Expired EP0042033B1 (fr) 1980-06-18 1981-03-10 Agent de désulfuration

Country Status (7)

Country Link
US (1) US4430118A (fr)
EP (1) EP0042033B1 (fr)
JP (1) JPS5726116A (fr)
AT (1) ATE13694T1 (fr)
CA (1) CA1161650A (fr)
DE (2) DE3022752A1 (fr)
ES (1) ES8305047A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0226994A1 (fr) * 1985-12-17 1987-07-01 SKW Trostberg Aktiengesellschaft Agent de désulfuration d'une fonte liquide ainsi que procédé de fabrication
EP0279894A1 (fr) * 1987-02-13 1988-08-31 Cyanamid Canada Inc. Méthode de désulfuration du fer
EP0110508B1 (fr) * 1982-09-22 1988-11-09 Kawasaki Steel Corporation Procédé pour la désulfuration de la fonte en fusion par injection

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58204119A (ja) * 1982-05-25 1983-11-28 Nippon Carbide Ind Co Ltd 融鉄の脱硫剤
JPS6169911A (ja) * 1985-09-06 1986-04-10 Kawasaki Steel Corp 融鉄の脱硫剤及びその製法
US5002733A (en) * 1989-07-26 1991-03-26 American Alloys, Inc. Silicon alloys containing calcium and method of making same
JPH0731691Y2 (ja) * 1992-03-16 1995-07-26 俊雄 今中 ワッペン
DE19724913A1 (de) * 1997-06-12 1998-12-17 Almamet Gmbh Mittel zur fluorfreien Behandlung von Stahlschmelzen in der Gießpfanne, Verfahren zu seiner Herstellung und seine Verwendung
JP4133318B2 (ja) * 2000-06-14 2008-08-13 Ｊｆｅミネラル株式会社 再生脱硫剤の製造方法及び低硫溶銑の製造方法
US6989040B2 (en) * 2002-10-30 2006-01-24 Gerald Zebrowski Reclaimed magnesium desulfurization agent

Citations (4)

* 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
DE2741588A1 (de) * 1977-09-15 1979-03-29 Sueddeutsche Kalkstickstoff Mittel zum entschwefeln von eisenschmelzen
DE2835872A1 (de) * 1978-08-16 1980-02-28 Sueddeutsche Kalkstickstoff Verfahren zur verminderung der staubund flammenbelaestigung bei der handhabung der schlacken nach der roheisenentschwefelung und hierfuer geeignetes entschwefelungsgemisch
FR2432550A1 (fr) * 1978-08-04 1980-02-29 Sueddeutsche Kalkstickstoff Procede pour la fabrication d'un melange de desulfuration pulverulent facilement fluidifiable

Patent Citations (4)

* 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
DE2741588A1 (de) * 1977-09-15 1979-03-29 Sueddeutsche Kalkstickstoff Mittel zum entschwefeln von eisenschmelzen
FR2432550A1 (fr) * 1978-08-04 1980-02-29 Sueddeutsche Kalkstickstoff Procede pour la fabrication d'un melange de desulfuration pulverulent facilement fluidifiable
DE2835872A1 (de) * 1978-08-16 1980-02-28 Sueddeutsche Kalkstickstoff Verfahren zur verminderung der staubund flammenbelaestigung bei der handhabung der schlacken nach der roheisenentschwefelung und hierfuer geeignetes entschwefelungsgemisch

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0110508B1 (fr) * 1982-09-22 1988-11-09 Kawasaki Steel Corporation Procédé pour la désulfuration de la fonte en fusion par injection
EP0226994A1 (fr) * 1985-12-17 1987-07-01 SKW Trostberg Aktiengesellschaft Agent de désulfuration d'une fonte liquide ainsi que procédé de fabrication
EP0279894A1 (fr) * 1987-02-13 1988-08-31 Cyanamid Canada Inc. Méthode de désulfuration du fer

Also Published As

Publication number Publication date
ES501368A0 (es) 1983-04-01
EP0042033B1 (fr) 1985-06-05
CA1161650A (fr) 1984-02-07
JPS5726116A (en) 1982-02-12
DE3170808D1 (de) 1985-07-11
US4430118A (en) 1984-02-07
DE3022752A1 (de) 1982-01-14
ATE13694T1 (de) 1985-06-15
ES8305047A1 (es) 1983-04-01

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