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EP0353265A1 - Procede de reduction de silicate de fer en fusion destine a produire une fibre ignifuge et chimiquement resistante ainsi que du metal de fond - Google Patents

Procede de reduction de silicate de fer en fusion destine a produire une fibre ignifuge et chimiquement resistante ainsi que du metal de fond

Info

Publication number
EP0353265A1
EP0353265A1 EP88910413A EP88910413A EP0353265A1 EP 0353265 A1 EP0353265 A1 EP 0353265A1 EP 88910413 A EP88910413 A EP 88910413A EP 88910413 A EP88910413 A EP 88910413A EP 0353265 A1 EP0353265 A1 EP 0353265A1
Authority
EP
European Patent Office
Prior art keywords
slag
iron silicate
iron
resistant
well
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Withdrawn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
EP88910413A
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 EP0353265A1 publication Critical patent/EP0353265A1/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Withdrawn legal-status Critical Current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 ulitilizing iron silicate slag in order to produce fibers resistant to high temperatures and severe chemical conditions, as well as bottom metal.
  • Metallurgical slags as such are not suitable for fibration.
  • the previously known methods for utilizing these slags in fiber production are based on the mixing of the slags with additives. These mixing agents are used to change the physical properties of the slag melt so as to be suitable for the fibration.
  • Industrial production uses almost exclusively blast furnace slags which are smelted in a cupola furnace and defibrated with a four-wheel centrifugal machine. The most generally produced end products are building insulation materials.
  • Electric furnace smelting which during the past years also has been assumed to fiber production, is now changing the situation and has enabled the utilization of new raw materials.
  • the use of an electric furnace is known for instance from the FI patent 72502.
  • the present invention is based on a different outlook.
  • the idea of this invention is to change the chemical composition of the iron silicate slag so as to be suitable for fibration by removing iron oxide from the slag.
  • Iron is present in the slag mainly as bivalent and bound in oxygen, in the form of FeO.
  • iron oxide - FeO - is an alkaline component which prevents the acidic slag components from forming continuous net structures, the existence of which is necessary for the defibration of the slag melt.
  • the slag composition is changed towards a more acidic direction, so that the SiO 2 and Al 2 O 3 contents in the slag are increased and the physical properties of the slag are changed to be favourable for defibration.
  • the removal of iron oxide is carried out by making use of the tendency to reduction of the iron oxide, which tendency is already known from cupola furnace smelting.
  • the iron oxide content of the slag is reduced by oxidizing iron from the slag for example by means of fine grounded coke or coal dust.
  • the metal obtained as the reduction product is separated from the slag and settles onto the bottom of the smelting furnace to form bottom metal.
  • the precious metals contained in the slag such as copper, nickel and cobalt, are also concentrated in the bottom metal.
  • the Fe content of the slag, as well as the amount of created metal is controlled by means of the amount of the reductive agent fed into the furnace. As a result from the reduction reactions, there is also created exhaust gas containing CO and CO 2 .
  • the reduction of iron silicate slag according to the present invention is carried out in a suitable furnace unit, for instance in an electric furnace.
  • the iron silicate slag can be fed into the furnace either in solid or in molten state.
  • the reductive agent for instance fine grounded coke, can be fed into the molten slag for instance by injecting through a lance or through electrodes. This also brings about a mixing in the molten slag, which is necessary for the reduction reactions. The mixing is also needed for enhancing the separation of the created metal drops from the slag.
  • the tapping of slag for defibration is arranged to be continuous. As for the metal, it is removed from the furnace discontinuously through a particularly arranged tapping hole.
  • the slag melt can be processed into fibers resistant to high temperatures and severe chemical conditions according to generally known defibration methods.
  • the composition of the created metal is essentially dependent on the amount of reductible metal oxides contained in the slag.
  • the Fe content of the bottom metal is generally over 90%, while the rest metals are among others precious metals such as copper, nickel and cobalt.
  • iron silicate slag renders two valuable end products: fiber and metal
  • iron silicate slag can be fed into the reduction furnace in molten state, so that the thermal energy contained by the slag is also made use of.
  • iron silicate slag As a by-product from the nickel process we obtain iron silicate slag, its typical chemical composition being: Fe 41.5%, SiO 2 29.5%, CaO 1.5%, MgO 6.5% and Al 2 O 3 4.1%.
  • defibratable slag With 75% of the iron contained in the slag is reduced according to the invention, we obtain defibratable slag with the following composition: Fe 17.6%, Sio 2 51.0%, CaO 2.6%, MgO 11.1% and Al 2 O 3 7.5%. All percentages are percentages by weight.
  • the molar alkalinity of the slag is 0.69. Per each consumed ton of iron silicate, the yield of defibratable slag mixture is roughly 590 kg and that of metal roughly 325 kg.

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)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Glass Compositions (AREA)

Abstract

La présente invention se rapporte à un procédé d'utilisation de laitier de silicate de fer pour produire des fibres résistantes à des températures élevées et à des conditions chimiques rigoureuses, ainsi que du métal de fond contenant des métaux précieux. Les propriétés de la fibre produite à partir du laitier en fusion sont bonnes lorsque l'alcalinité molaire (FeO+CaO+MgO)/(SiO2+Al2O3) du laitier destiné au défibrage est comprise entre 0,5 et 8.
EP88910413A 1987-11-27 1988-11-18 Procede de reduction de silicate de fer en fusion destine a produire une fibre ignifuge et chimiquement resistante ainsi que du metal de fond Withdrawn EP0353265A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI875239A FI86409C (fi) 1987-11-27 1987-11-27 Reducering av jaernsilikatslagg foer framstaellning av eldfast och kemiskt bestaendig fiber och bottenmetall.
FI875239 1987-11-27

Publications (1)

Publication Number Publication Date
EP0353265A1 true EP0353265A1 (fr) 1990-02-07

Family

ID=8525486

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88910413A Withdrawn EP0353265A1 (fr) 1987-11-27 1988-11-18 Procede de reduction de silicate de fer en fusion destine a produire une fibre ignifuge et chimiquement resistante ainsi que du metal de fond

Country Status (4)

Country Link
EP (1) EP0353265A1 (fr)
JP (1) JPH02502373A (fr)
FI (1) FI86409C (fr)
WO (1) WO1989004814A1 (fr)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1088861B (de) * 1955-08-13 1960-09-08 Hoerder Huettenunion Ag Verfahren zum Herstellen von Schlackenwolle

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8904814A1 *

Also Published As

Publication number Publication date
FI86409C (fi) 1992-08-25
FI86409B (fi) 1992-05-15
FI875239L (fi) 1989-05-28
FI875239A0 (fi) 1987-11-27
WO1989004814A1 (fr) 1989-06-01
JPH02502373A (ja) 1990-08-02

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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