EP0582970B1 - Produit pour désulfuration des fontes et des aciers liquides et procédé de désulfuration - Google Patents

Produit pour désulfuration des fontes et des aciers liquides et procédé de désulfuration Download PDF

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Publication number
EP0582970B1
EP0582970B1 EP93112545A EP93112545A EP0582970B1 EP 0582970 B1 EP0582970 B1 EP 0582970B1 EP 93112545 A EP93112545 A EP 93112545A EP 93112545 A EP93112545 A EP 93112545A EP 0582970 B1 EP0582970 B1 EP 0582970B1
Authority
EP
European Patent Office
Prior art keywords
magnesium
iron
weight
desulfurization
additive
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 - Lifetime
Application number
EP93112545A
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German (de)
English (en)
Other versions
EP0582970A1 (fr
Inventor
Alfred Dr. Freissmuth
Eugen Ing. Wieser
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.)
Freissmuth Alfred Dr-Ing
Original Assignee
Freissmuth Alfred Dr-Ing
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 Freissmuth Alfred Dr-Ing filed Critical Freissmuth Alfred Dr-Ing
Publication of EP0582970A1 publication Critical patent/EP0582970A1/fr
Application granted granted Critical
Publication of EP0582970B1 publication Critical patent/EP0582970B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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 invention relates to means and methods for the Desulphurization of molten iron, especially pig iron and cast iron melting.
  • the magnesium has a so-called post-desulfurization property. After the desulfurization treatment has ended with conventional mixtures can still magnesium-sulfur particles are excreted, the final sulfur value the melt change further.
  • the invention has for its object an improved Desulfurizing agent for desulfurizing pig iron and To create cast iron melts, which the disadvantages of Does not have the prior art.
  • At least one naturally occurring silicate mineral with ribbon, leaf or spatial network structure contain.
  • silicate minerals Montmorillonite, e.g. Pearlite (band structure), kaolinite (Leaf structure) or those from the feldspar group (spatial network structure), like albite (sodium feldspar), potash feldspar or anorthite (lime feldspar) or syenite (with contents on alkali feldspar) or rhyolite with sprinklers from Plagio glass and biotite as well as nepheline (a sodium aluminum silicate) used.
  • feldspar group spatial network structure
  • albite sodium feldspar
  • potash feldspar or anorthite lime feldspar
  • syenite with contents on alkali feldspar
  • rhyolite with sprinklers from Plagio glass and biotite as well as nepheline (a sodium aluminum silicate) used.
  • the desulfurization agent from a mixture of magnesium, silicate mineral and optionally calcium carbide and / or calcium oxide.
  • the magnesium with the silicate minerals and the other components envelops. This is done by a normal circulation process in a suitable mixer, provided the silicate Minerals brought to approximately the same grain size have been like the magnesium. Under this condition the silicate minerals envelop the fine-grained magnesium bowl-shaped.
  • the other components such as Calcium carbide and / or calcium oxide installed at the same time will. However, these components can also be used in one additional shell applied to the silicate cover will.
  • the magnesium grain is about the same Flowability imparted like the mineral components of the desulfurizing agent. So that becomes a pneumatic receive well-funded funds that span the entire Blowing duration evenly in the pre-calculated Allow quantity to be introduced into the molten iron.
  • the magnesium also loses through this coating its metallic surface, with which its segregation tendency not only reduced during transport and handling, but is practically avoided. You can with such Desulphurization mixtures according to the invention which are technological avoid complex blowing technique of co-injection.
  • the silicates with their alkali content such as in particular the nepheline, but also the potash and soda feldspars in turn contribute to desulfurization by by splitting off their alkali portion alkali sulfides form, which are deposited in the slag.
  • these feldspars together with the Alkali sulfur compounds and other additives of the desulfurizing agent liquefaction of the slag and thereby reducing their absorption capacity for iron granules.
  • silicate minerals e.g. of the rhyolite
  • the iron slowly rises in the molten iron while doing so absorbs the unwanted sulfur-containing components, Surprisingly, the effect of back desulfurization is eliminated; the final sulfur content once reached changes no further.
  • the silicates used according to the invention influence the components contained in the mixture as diluents in that they liquefy them (or at least convert to a viscous state), with which favors the uptake of sulfidic products and their Separation behavior is improved.
  • the desulfurization agent has a proportion of 3 to 95% by weight of feldspar or nepheline syenite in addition to magnesium as a further desulfurizing component. Furthermore, a proportion of a mixture consisting of 5 to 50% by weight rhyolite / montmorillonite can be added to the magnesium as a further desulfurizing component.
  • the blowing rate was 1.46 kg desulfurizing agent per ton, which results in a magnesium consumption of 0.36 kg per ton calculated.
  • the blowing time was about 7 minutes.
  • a granulated mixture consisting of 25% by weight Magnesium, 45% by weight calcium oxide and 30% by weight feldspar used with nine melts of approx. 115 t.
  • the initial sulfur content was approx. 0.040% by weight the final sulfur content after treatment is less than 0.005 % By weight.
  • the blowing time was about 7 minutes.
  • the slag contained Granules in the range of 10-20% by weight. She was without one Running along / pulling the iron melt away very well.
  • the fine-grained magnesium component (0.2-0.9 mm) was mixed with 20% by weight rhyolite; the calcium carbide component was mixed with 40 wt .-% feldspar.
  • the relationship of the two co-injection components was approximately 3.5: 1.
  • a magnesium requirement of 0.35 kg / t was determined, against a magnesium requirement of 0.47 kg / t a working method according to the state of the art.
  • the low content of Iron granules of less than 15 wt .-% determined. The Slag continued to run after long periods of treatment still perfectly off the torpedo pan.

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)

Claims (6)

  1. Un agent de désulfuration de la fonte d'affinage et de moulage, par injection pneumatique, basé sur le magnésium, où le magnésium, est introduit, le cas échéant, avec un enrobage à base de silicates alcalins et de carbure de calcium et/ou de chaux, et, où l'agent de désulfuration contient:
    5 % à 92 % de magnésium,
    10 % à 60 % de feldspath, de nepheline-syenite ou de rhyolite ou de montmorillonite,
    5 % à 92 % de carbure de calcium et/ou de chaux.
  2. Un agent suivant le revendication 1, caractérisé de telle sorte qu'il contienne 25 - 92 % de magnésium.
  3. Un agent suivant les revendications 1 à 2, caractérisé de telle sorte qu'il contienne 50 - 92 % de magnésium.
  4. Un agent suivant les revendications 1 à 3, caractérisé de telle sorte que le magnèsium soit enrobé de silicate.
  5. Un procédé pour la désulfuration de fonte liquide avec l'agent selon les revendications 1 à 4, caractérisé de telle sorte que cet agent soit introduit pneumatiquement, par une lance, dans la fonte liquide.
  6. Un procédé, suivant la revendication 5, caractérisé de telle sorte que le magnésium fluidifié séparément des autres composants, soit co-injecté dans la lance avec ceux-ci.
EP93112545A 1992-08-13 1993-08-05 Produit pour désulfuration des fontes et des aciers liquides et procédé de désulfuration Expired - Lifetime EP0582970B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4226833A DE4226833A1 (de) 1992-08-13 1992-08-13 Entschwefelungsmittel für Roheisen und Gußeisen
DE4226833 1992-08-13

Publications (2)

Publication Number Publication Date
EP0582970A1 EP0582970A1 (fr) 1994-02-16
EP0582970B1 true EP0582970B1 (fr) 1998-04-08

Family

ID=6465490

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93112545A Expired - Lifetime EP0582970B1 (fr) 1992-08-13 1993-08-05 Produit pour désulfuration des fontes et des aciers liquides et procédé de désulfuration

Country Status (4)

Country Link
US (1) US5336293A (fr)
EP (1) EP0582970B1 (fr)
AT (1) ATE164887T1 (fr)
DE (2) DE4226833A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATA115194A (de) * 1994-06-08 1997-07-15 Donau Chemie Ag Entschwefelungsmittel für roheisen- und gusseisenschmelzen
AT412477B (de) * 2003-07-14 2005-03-25 Donau Chemie Ag Mittel zur entschwefelung von metallschmelzen
CN103911484B (zh) * 2014-01-27 2016-05-11 内蒙古机电职业技术学院 一种钢铁冶炼用钝化颗粒镁的制备方法
US10151534B2 (en) 2015-05-14 2018-12-11 Larry J Epps Method for slag removal during metal processing
WO2016205312A1 (fr) 2015-06-17 2016-12-22 Epps Larry J Lance d'agitation de matériau coaxiale et son procédé d'utilisation
US10344343B2 (en) 2016-06-15 2019-07-09 Larry J Epps Multiple chamber material-stirring lance and method
CN115612788A (zh) * 2021-07-13 2023-01-17 郑州富斯鼎新材料有限公司 一种钢铁铸造用除渣剂及其制备方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1415150A (en) * 1972-11-16 1975-11-26 Magnesium Elektron Ltd Addition of magnesium to molten metal
US3929464A (en) * 1973-08-31 1975-12-30 Union Carbide Corp Desulfurization of molten ferrous metals
US3998625A (en) * 1975-11-12 1976-12-21 Jones & Laughlin Steel Corporation Desulfurization method
DE3000927C2 (de) * 1980-01-11 1983-07-21 Foseco International Ltd., Birmingham Entschwefelung von Eisenmetallen
DE3121089A1 (de) * 1981-05-27 1982-12-16 Metallgesellschaft Ag, 6000 Frankfurt Drahtfoermiges mittel zum behandeln von metallschmelzen
IT1201506B (it) * 1985-12-03 1989-02-02 Giovanni Crespi Miscela fondente per scorie d'acciaierie in forni ad arco,forni a ossigeno tipo ld, o.b.m.,kaldo e altri similari
GB8712168D0 (en) * 1987-05-22 1987-06-24 Foseco Int Metallurgical treatment agents
DE3831831C1 (fr) * 1988-09-20 1989-11-02 Skw Trostberg Ag, 8223 Trostberg, De

Also Published As

Publication number Publication date
EP0582970A1 (fr) 1994-02-16
DE4226833A1 (de) 1994-02-17
DE59308374D1 (de) 1998-05-14
US5336293A (en) 1994-08-09
ATE164887T1 (de) 1998-04-15

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