EP0038417B1 - Agent de désulfuration - Google Patents

Agent de désulfuration Download PDF

Info

Publication number
EP0038417B1
EP0038417B1 EP81101765A EP81101765A EP0038417B1 EP 0038417 B1 EP0038417 B1 EP 0038417B1 EP 81101765 A EP81101765 A EP 81101765A EP 81101765 A EP81101765 A EP 81101765A EP 0038417 B1 EP0038417 B1 EP 0038417B1
Authority
EP
European Patent Office
Prior art keywords
agent according
lime
quicklime
desulfurization
weight
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
EP81101765A
Other languages
German (de)
English (en)
Other versions
EP0038417A1 (fr
Inventor
Alfred Dr. Freissmuth
Werner Dr. Gmöhling
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 AT81101765T priority Critical patent/ATE10650T1/de
Publication of EP0038417A1 publication Critical patent/EP0038417A1/fr
Application granted granted Critical
Publication of EP0038417B1 publication Critical patent/EP0038417B1/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
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising
    • C21C1/025—Agents used for dephosphorising or desulfurising

Definitions

  • the invention relates to an agent for the desulfurization of pig iron.
  • hot metal or steel can be desulfurized by adding quicklime to the molten iron.
  • quicklime for example, when steel is produced in the oxygen inflation converter, lime is added to bind sulfur.
  • the object of the invention is therefore to provide a highly effective desulfurization agent which can be introduced with a smaller amount of conveying gas 1n, the pig iron to be treated and thus enables lower material losses and considerable energy savings due to less cooling of the pig iron to be desulfurized.
  • the agent according to the invention for the desulfurization of pig iron or crude steel, which is characterized by a mixture of quicklime (CaO) and diamide lime and as an aid up to 10% by weight fluorspar.
  • the aid can also be missing.
  • the agent according to the invention consists of 50-90% by weight of quicklime and 10-50% by weight of diamide lime.
  • the agent according to the invention is preferably in powder form, which is obtained by grinding the components.
  • the agent according to the invention preferably has a particle size suitable for pneumatic conveying.
  • the diamide lime used as a component for the agent according to the invention is a chemically produced, precipitated calcium carbonate which has a carbon content of 5 to 50% by weight.
  • the mixture of the desulfurization agent according to the invention preferably consists of 50 to 90% by weight, in particular 60 to 85% by weight of quicklime and 10 to 50% by weight, in particular 15 to 40% by weight of diamide lime.
  • the desulfurization agent according to the invention with a diamide lime content of about 40% by weight (with a carbon content of 40 to 50% by weight) in a mixture is particularly suitable for hot metal desulfurization in torpedo pans.
  • the desulphurization agent according to the invention preferably has a diamide lime content of 15 to 25% by weight in the mixture.
  • the diamide lime contained in the desulfurization agent according to the invention has a carbon content of 5 to 50% by weight and preferably 10 to 40% by weight.
  • the desulfurization agent according to the invention requires a significantly smaller amount of conveying gas than the quicklime used hitherto for the same purpose.
  • the agent according to the invention can thus be evenly conveyed with a conveying gas quantity of only 7 NI per kg.
  • the calcium carbonate portion of the diamide lime suddenly decomposes after it emerges from the lance through which the agent is introduced into the pig iron to be desulfurized, thereby ensuring intensive mixing of the solid desulfurizing agent with the iron melt to be treated.
  • the calcium carbonate portion of the diamide lime initially becomes highly reactive because freshly burned lime (CaO). Because this mixture produces gas in the molten iron, a large number of small gas bubbles with a very small diameter are formed.
  • the desulfurization agent according to the invention has the considerable advantage of a significantly improved reactivity compared to the lime used conventionally. So when using the agent according to the invention to produce the same desulfurization effect, it is surpassing Schenderend only necessary to add only about half the amount that would be necessary with the treatment with quicklime.
  • the agent according to the invention which had been produced by grinding 60% by weight of quicklime and 40% by weight of diamide lime with a carbon content of 20% by weight, was then used in the same plant in order to desulfurize the same pig iron.
  • To achieve the same desulfurization effect only 4.8 kg of the desulfurization agent per ton of pig iron was required.
  • the mixture could be pumped with little gas.
  • For uniform, trouble-free blowing in only 7 NI conveying gas per kg of the desulfurizing agent was necessary.
  • the conveyor speed could therefore be increased to 100 kg per minute. Even at this higher blowing rate, only 700 NI of conveying gas per minute were required. This corresponds to only about a fifth of the amount per unit of time that was necessary to convey the lime. This resulted in a correspondingly lower turbulence of the melt.
  • the pan was well filled, no ejection occurred.
  • Another advantage of the desulphurization agent according to the invention which can only be used in a smaller amount, and the possible higher conveying speed, is that the treatment of the 160 t of pig iron was finished after about 10 minutes, while the desulphurization treatment with quicklime lasts practically 1 hour. Such a long time is normally not available for desulfurization. A consequence of the lengthy treatment using large quantities when blowing in quicklime is still a strong cooling of the pig iron melt. For example, the temperature of the hot metal that was desulphurized with burnt lime dropped by 42 ° C, while the temperature loss when using the desulfurization agent according to the invention was only 8 ° C.
  • the desulfurizing agent according to the invention has surprising advantages compared to the commonly used quicklime.

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)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
  • Tea And Coffee (AREA)
  • Soy Sauces And Products Related Thereto (AREA)
  • Fats And Perfumes (AREA)
  • Catalysts (AREA)

Claims (8)

1. Produit pour la désulfuration de la fonte, caractérisé par un mélange de chaux vive et de diamide-chaux et, en tant que produit auxiliaire, jusqu'à 10% en poids de spath-fluor.
2. Produit selon la revendication 1, caractérisé en ce que le mélange consiste en:
50 à 90% en poids de chaux vive et
10 à 50% en poids de diamide-chaux.
3. Produit selon les revendications 1 ou 2, caractérisé en ce que le mélange consiste en:
60 à 85% en poids de chaux vive et
15 à 40% en poids de diamide-chaux.
4. Produit pour la désulfuration de la fonte, caractérisé en ce qu'il est exempt de produit auxiliaire et consiste en:
50 à 90% en poids de chaux vive et
10 à 50% en poids de diamide-chaux.
5. Produit selon la revendication 4, caractérisé en ce qu'il consiste en:
60 à 85% en poids de chaux vive et
15 à 40% en poids de diamide-chaux.
6. Produit selon l'une des revendications 1 à 5, caractérisé en ce que la diamide-chaux contenue a une teneur en carbone de 5 à 50% en poids.
7. Produit selon la revendication 6, caractérisé en ce que la diamide-chaux contenue a une teneur en carbone de 10 à 40% en poids.
8. Produit selon l'une des revendications 1 à 7, caractérisé en ce qu'il est à une dimension de particule convenant pour le transport pneumatique.
EP81101765A 1980-04-18 1981-03-10 Agent de désulfuration Expired EP0038417B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81101765T ATE10650T1 (de) 1980-04-18 1981-03-10 Entschwefelungsmittel.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3015024 1980-04-18
DE3015024A DE3015024C2 (de) 1980-04-18 1980-04-18 Entschwefelungsmittel für Roheisen

Publications (2)

Publication Number Publication Date
EP0038417A1 EP0038417A1 (fr) 1981-10-28
EP0038417B1 true EP0038417B1 (fr) 1984-12-05

Family

ID=6100415

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81101765A Expired EP0038417B1 (fr) 1980-04-18 1981-03-10 Agent de désulfuration

Country Status (6)

Country Link
EP (1) EP0038417B1 (fr)
JP (1) JPS56158807A (fr)
AT (1) ATE10650T1 (fr)
CA (1) CA1171663A (fr)
DE (2) DE3015024C2 (fr)
ES (1) ES501153A0 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56158827A (en) * 1980-05-10 1981-12-07 Nippon Carbide Ind Co Ltd Powdered composition for desulfurizing agent
JPS58204119A (ja) * 1982-05-25 1983-11-28 Nippon Carbide Ind Co Ltd 融鉄の脱硫剤
DE3474568D1 (en) * 1984-06-28 1988-11-17 Thyssen Stahl Ag Method for desulfurizing pig iron
LU86689A1 (fr) * 1985-12-03 1987-05-04 Centro Speriment Metallurg Procede d'epuration continue de fonte en fusion
DE4242328C2 (de) * 1992-12-15 1995-06-08 Alfred Dipl Ing Dr Freissmuth Mittel zur Entschwefelung, Entphosphorung, Entsilicierung und Entstickung von Roheisen- und Gußeisenschmelzen
US6989040B2 (en) 2002-10-30 2006-01-24 Gerald Zebrowski Reclaimed magnesium desulfurization agent
JP5653741B2 (ja) 2010-12-15 2015-01-14 タカタ株式会社 バックルおよびこれを備えたシートベルト装置
DE102011116501C5 (de) * 2011-10-20 2018-05-24 Almamet Gmbh Bitumen enthaltendes Entschwefelungsmittel

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1583268B1 (de) * 1967-12-29 1971-08-05 Konink Nl Hoogovens En Staalfa Mittel zur Entschwefelung von fluessigem Eisen auf der Basis von technischem Kalkstickstoff und Verfahren zur Entschwefelung von Eisen

Also Published As

Publication number Publication date
JPS56158807A (en) 1981-12-07
DE3015024A1 (de) 1981-10-29
CA1171663A (fr) 1984-07-31
EP0038417A1 (fr) 1981-10-28
ATE10650T1 (de) 1984-12-15
ES8205867A1 (es) 1982-07-01
ES501153A0 (es) 1982-07-01
DE3015024C2 (de) 1982-12-23
DE3167539D1 (de) 1985-01-17

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