EP0346415A1 - Procede de melange de laitier de ferrochrome destine a produire une fibre ignifuge et chimiquement resistante - Google Patents

Procede de melange de laitier de ferrochrome destine a produire une fibre ignifuge et chimiquement resistante

Info

Publication number
EP0346415A1
EP0346415A1 EP19880910414 EP88910414A EP0346415A1 EP 0346415 A1 EP0346415 A1 EP 0346415A1 EP 19880910414 EP19880910414 EP 19880910414 EP 88910414 A EP88910414 A EP 88910414A EP 0346415 A1 EP0346415 A1 EP 0346415A1
Authority
EP
European Patent Office
Prior art keywords
slag
mixing
resistant
ferrochromium
sio
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Withdrawn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
EP19880910414
Other languages
German (de)
English (en)
Inventor
Frans Heikki Tuovinen
Aarno Taneli Salervo
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.)
Outokumpu Oyj
Original Assignee
Outokumpu Oyj
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 Outokumpu Oyj filed Critical Outokumpu Oyj
Publication of EP0346415A1 publication Critical patent/EP0346415A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C1/00—Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels
    • C03C1/002—Use of waste materials, e.g. slags
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C13/00—Fibre or filament compositions
    • C03C13/06—Mineral fibres, e.g. slag wool, mineral wool, rock wool

Definitions

  • the present invention relates to a method for preparing ferrochromium slag, by adding SiO 2 and A1 2 O 3 bearing mixing agents, into a slag melt which can be defibrated into fibers resistant to high temperatures and highly alkaline conditions mainly for industrial use.
  • Ferrochromium slag is chromium-bearing magnesium-aluminiumsilicate, which is a by product from the process of metallic ferrochromium. It is typical of this slag that it is created in extremely reductive conditions in electric furnace smelting. Therefore it contains hardly any metal oxides that are reduced more easily than chromium oxide, nor does it contain easily evaporable components.
  • Ferrochromium slag is suited to be used as a raw material for special fibers resistant to high temperatures and alkaline conditions for the following reasons, among others:
  • the slag is homogeneous, once smelted and in the s o l i d state partly glazed material
  • the slag is an economically advantageous raw material.
  • ferrochromium slag used in the production of fibers is known from the Finnish patent application 845115.
  • the said application discloses two methods for mixing ferrochromium slag, with silicon oxide and aluminium oxide.
  • the purpose of mixing the ferrochromium slag is to change the physical properties of the slag melt so that the melt can be processed into fibers by means of generally known defibration methods.
  • the purpose of the mixing is to make sure that the desired properties for the end product are achieved. Therefore the defibration capacity of the slag melt cannot be improved for instance at the cost of the heat resistance of the end product fibers.
  • the present invention introduces an improved method for mixing ferrochromium slag, whereby it is possible to prepare such slag melt that the fibers produced thereof are resistant to high temperatures and alkaline conditions.
  • the fibers are mechanically strong and easily processible, which is of crucial importance with respect to their usability.
  • the mixing method of the present invention differs essentially from the one described in the FI patent application 845115 as for the mixing ratios and amounts of the employed agents.
  • the chemical composition of the slag melt to be defibrated, and naturally that of the end product fibers as well, is different and its properties better.
  • ferrochromium slag there are mixed SiO 2 , and A1 2 O 3 bearing mixing agents (such as quartz, anorthosite, kyanite, andalusite, bauxite etc.) so that the total SiO 2 /A1 2 O 3 ratio of the mixing agents is 0.8-1.85, and the MgO content of the mixed slag, reduced to the system MgOA1 2 O-SiO 2 , is 10-20% by weight.
  • the MgO, A1 2 O 3 and SiO 2 contents of the real multicomponent slag are accumulated up to 100% by maintaining the mutual relations of the contents.
  • the reduced MgO content of the slag melt to be defibrated is limited to below 20% by weight in order to ensure the defibrating capacity of the slag melt and above 10% by weight in order to prevent excessive increases in the defibration temperature of the slag melt.
  • the SiO 2 /A1 2 O 3 ratio between the mixing agents it is determined in order to secure the mechanical strength of the fiber.
  • the invention is also illustrated with reference to the appended drawing, which is a phase diagram of the system MgO -A1 2 O 3 -SiO 2 .
  • the drawing describes a composition of the FeCr slag, and the corresponding content range which falls within the scale of the present invention is shaded. If the composition of the FeCr slag is changed, the shaded area also changes, but the ratio between the mixing agents is maintained the same.
  • the amount of mixing agents added to the ferr ochromi um slag is 33-60% of the amount of the final slag.
  • the mixing takes place in a smelting furnace where the temperature and outflow of the melt are easily adjusted.
  • a suitable smelting furnace is for instance an electric furnace.
  • the ferrochromium slag mixed according to the method of the present invention can, by applying generally known defibration methods, be produced into special fiber with a better fire-resistance than with the known mineral or slag fibers. As for strength and processibility, this fiber is comparable to them or better. Its alkaline resistance is better as well.
  • the slag melt itself has a strong inclination for glazing.
  • the slag forms a completely glass like structure.
  • the created glass has a deep blue colour, and the fiber made thereof is light blue.
  • the chemical composition of a typical ferrochromium slag is: Fe 4.9%, Cr 9.0%, SiO 2 29.6%, CaO 3.1%, MgO 25.9% and A1 2 O 3 22.7% (percentages by weight).
  • the composition is: MgO 33.1%, A1 2 O 3 29.0% and SiO 2 37.9%.
  • the obtained composition range for the mixed slag is the shaded area of figure 1.
  • the initial composition of the ferrochromium slag is also indicated in the drawing.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Glass Compositions (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Inorganic Fibers (AREA)

Abstract

La présente invention se rapporte à un procédé servant à préparer un laitier de ferrochrome, en ajoutant du SiO2 et de l'Al2O3 porteurs d'agents de mélange dans du laitier en fusion, lequel peut subir un défibrage pour former des fibres résistantes à des températures et à des conditions alcalines. On obtient des fibres mécaniquement résistantes lorsque le rapport SiO2/Al2O3 des agents de mélange ajoutés et compris entre 0,8 et 1,85 et lorsque la teneur en MgO du laitier mélangé, tel qu'il est réduit au système MgO-Al2O3-SiO2, est comprise entre 10 et 20% en poids.
EP19880910414 1987-11-27 1988-11-18 Procede de melange de laitier de ferrochrome destine a produire une fibre ignifuge et chimiquement resistante Withdrawn EP0346415A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI875238A FI78447C (fi) 1987-11-27 1987-11-27 Tillsaettning av ferrokromslagg foer framstaellning av eldfasta och kemiskt bestaendiga fibrer.
FI875238 1987-11-27

Publications (1)

Publication Number Publication Date
EP0346415A1 true EP0346415A1 (fr) 1989-12-20

Family

ID=8525485

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880910414 Withdrawn EP0346415A1 (fr) 1987-11-27 1988-11-18 Procede de melange de laitier de ferrochrome destine a produire une fibre ignifuge et chimiquement resistante

Country Status (4)

Country Link
EP (1) EP0346415A1 (fr)
JP (1) JPH02502372A (fr)
FI (1) FI78447C (fr)
WO (1) WO1989004813A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5045506A (en) * 1989-07-31 1991-09-03 Alcan International Limited Process for producing mineral fibers incorporating an alumina-containing residue from a metal melting operation and fibers so produced
DE98965734T1 (de) * 1997-12-02 2007-01-18 Rockwool International A/S Briketts für die mineralfaserherstellung und deren verwendung
ATE235428T1 (de) * 1997-12-02 2003-04-15 Rockwool Int Verfahren zur herstellung von glasartigen kunstfasern
WO2013179330A1 (fr) * 2012-05-28 2013-12-05 ニチアス株式会社 Fibre inorganique à base de si-mg et composition la contenant

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8904813A1 *

Also Published As

Publication number Publication date
FI78447C (fi) 1989-08-10
WO1989004813A1 (fr) 1989-06-01
JPH02502372A (ja) 1990-08-02
FI78447B (fi) 1989-04-28
FI875238A0 (fi) 1987-11-27

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