SE463499B - Covering agent for a metal smelt - Google Patents

Covering agent for a metal smelt

Info

Publication number
SE463499B
SE463499B SE8703857A SE8703857A SE463499B SE 463499 B SE463499 B SE 463499B SE 8703857 A SE8703857 A SE 8703857A SE 8703857 A SE8703857 A SE 8703857A SE 463499 B SE463499 B SE 463499B
Authority
SE
Sweden
Prior art keywords
perlite
burnt
covering agent
coating
grains
Prior art date
Application number
SE8703857A
Other languages
Swedish (sv)
Other versions
SE8703857L (en
SE8703857D0 (en
Inventor
B Olson
Original Assignee
Ssab Svenskt Stal Ab
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 Ssab Svenskt Stal Ab filed Critical Ssab Svenskt Stal Ab
Priority to SE8703857A priority Critical patent/SE463499B/en
Publication of SE8703857D0 publication Critical patent/SE8703857D0/en
Publication of SE8703857L publication Critical patent/SE8703857L/en
Publication of SE463499B publication Critical patent/SE463499B/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D7/00—Casting ingots, e.g. from ferrous metals
    • B22D7/06—Ingot moulds or their manufacture
    • B22D7/10—Hot tops therefor

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mold Materials And Core Materials (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

A covering agent which is intended to be applied to the surface of an open metal smelt in order to reduce the loss of heat from the smelt, which consists of a mixture of pearlite and burnt dolomite or burnt magnesite. Preferably, the pearlite grains have been expanded by means of heating, and, furthermore, the covering agent consists of a mechanical mixture. The pearlite grains can also be provided with a coating which consists of quicklime, and/or magnesium oxide, and/or calcium aluminate.

Description

15 20 25 30 35 êßš 499 blandning av silikatmaterialet perlit, bränd dolomit, CaO + MgO, eller bränd magnesit, MgO och att perlitkornen expanderats genom upphettning. Därvid har kristallvatten avgått och perlitens sammansättning kan t ex bli följande uttryckt 1 viktsprocent sioz 71-75 % A12o3 12,5-18 % Kzo H-5 % Nazo 2,9-u % CaO 0,5-2 % Fe2o3 0,5-1,5 % Mgo 0,1-ø,5 % Tioz 0,003-0,2 % S och C 0 övriga kännetecken framgår av patentkraven 2-3. Êßš 499 mixture of the silicate material perlite, burnt dolomite, CaO + MgO, or burnt magnesite, MgO and that the perlite grains have been expanded by heating. In this case, crystalline water has left and the composition of the perlite can, for example, be as follows, expressed as 1% by weight of 71-75% Al 2 O 3 12.5-18% K 2O H-5% -1.5% Mgo 0,1-ø, 5% Tioz 0,003-0,2% S and C 0 other characteristics appear from claims 2-3.

I ett alternativt utförande av uppfinningen kan man även förse de expanderande perlitkornen med en be- läggning av kalk, CaO och/eller magnesiumoxid, MgO och/eller kalciumaluminat, CaO Al2O3 och/eller bränd dolomit, CaO + MgO. En fördel med den lätta perliten är att det är mycket lätt att åstadkomma exakta blandnings- förhâllanden vid inblandning av andra ämnen, i synnerhet genom att låta dessa ämnen utgöra beläggning på perlit- kornen. ' En beläggning som saknar alkali ger perlitkornet som helhet en högre smältpunkt. Vid en temperaturhöjning över perlitens smältpunkt bildar beläggningen ett eldfast skal som medför att perlitkornet inte faller ihop trots att perliten i kornet blivit flytande. Genom den kemiska t reaktion som därvid äger rum mellan den flytande perliten och beläggningen blir perliten allt mindre alkalisk var- vid dess smältpunkt höjes så att kornet till sist stel- nar. Detta förhållande höjer täckmedlets smältpunkt som helhet vilket är särskilt fördelaktigt vid smältor av stål där temperaturen uppgår till_§ 1600°C. 10 15 20 25 30 35 463 499 Den expanderade perliten utgör ett glasigt ma- terial varigenom den kan användas som täckmedel utan risk för att personer som vistas i närheten vid dess använd- ning skall drabbas av silikos. Den expanderade perliten har vidare en skrymdensitet av 30-150 kg/m3 vilket medför att den i säckad form är mycket lätt att hantera. För att de lätta perlitkornen inte skall medfölja den termiska luftströmningen vid metallsmältans yta kan den expandera- de perliten vara förpackad i säckar, i synnerhet av po- lyeten, som medger ett lugnt spridningsförlopp under det att säckmaterialet genom värmen från smältan upplöses i vatten och koldioxid. När den expanderade perliten pâ- föres metallsmältans yta smälter den del av perlitskiktet som ligger närmast i kontakt med smältan medan övriga de- lar intar tillstånd från begränsad sintring, vilken ger önskade elasticiteten, till opåverkad kornform, som ger en god värmeisolation.In an alternative embodiment of the invention, the expanding perlite grains can also be provided with a coating of lime, CaO and / or magnesium oxide, MgO and / or calcium aluminate, CaO Al2O3 and / or burnt dolomite, CaO + MgO. An advantage of the light perlite is that it is very easy to achieve exact mixing conditions when mixing in other substances, in particular by allowing these substances to form a coating on the perlite grains. A coating that lacks alkali gives the perlite grain as a whole a higher melting point. When the temperature rises above the melting point of the perlite, the coating forms a refractory shell which means that the perlite grain does not collapse despite the perlite in the grain becoming liquid. Due to the chemical reaction that takes place between the liquid perlite and the coating, the perlite becomes less and less alkaline, whereby its melting point is raised so that the grain eventually solidifies. This ratio raises the melting point of the coating agent as a whole, which is particularly advantageous in steel melts where the temperature is 1600 ° C. 10 15 20 25 30 35 463 499 The expanded perlite constitutes a glassy material whereby it can be used as a covering agent without the risk of persons staying in the vicinity during its use being affected by silicosis. The expanded perlite also has a bulk density of 30-150 kg / m3, which means that it is very easy to handle in sacked form. In order for the light perlite grains not to accompany the thermal air flow at the surface of the molten metal, the expanded perlite can be packed in bags, in particular of the polyethylene, which allows a smooth spreading process while the bag material dissolves in water and carbon dioxide through the heat of the melt. . When the expanded perlite is applied to the surface of the molten metal, the part of the perlite layer which is closest in contact with the melt melts, while other parts take states from limited sintering, which gives the desired elasticity, to unaffected grain form, which provides good thermal insulation.

Claims (3)

10 15 20 25 30 35 1-3 O' \ LM! -F"~ 'xD UD PATENTKRAV10 15 20 25 30 35 1-3 O '\ LM! -F "~ 'xD UD PATENTKRAV 1. Täckmedel, avsett för att anbringas på ytan av en öppen metallsmälta för att minska värmeförlusten från denna, k ä n n e t e c k n a t av att det utgörs av en blandning av perlit, bränd dolomit eller bränd magne- sit, och att perlitkornen expanderats genom upphettning.Coatings intended to be applied to the surface of an open molten metal to reduce the heat loss therefrom, characterized in that it is a mixture of perlite, burnt dolomite or burnt magnetite, and that the perlite grains are expanded by heating. 2. Täckmedel enligt krav 1, k ä n n e t e c k - n a t av att det utgörs av en mekanisk blandning.Coating composition according to Claim 1, characterized in that it consists of a mechanical mixture. 3. Täckmedel enligt krav 1, k ä n n e t e c k - n a t av att perlitkornen är försedda med en beläggning som består av bränd magnesiumoxid, och/eller bränd dolo- mit och/eller kalciumaluminat.Coating agent according to Claim 1, characterized in that the perlite grains are provided with a coating consisting of burnt magnesium oxide, and / or burnt dolomite and / or calcium aluminate.
SE8703857A 1987-10-07 1987-10-07 Covering agent for a metal smelt SE463499B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SE8703857A SE463499B (en) 1987-10-07 1987-10-07 Covering agent for a metal smelt

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8703857A SE463499B (en) 1987-10-07 1987-10-07 Covering agent for a metal smelt

Publications (3)

Publication Number Publication Date
SE8703857D0 SE8703857D0 (en) 1987-10-07
SE8703857L SE8703857L (en) 1989-04-08
SE463499B true SE463499B (en) 1990-12-03

Family

ID=20369774

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8703857A SE463499B (en) 1987-10-07 1987-10-07 Covering agent for a metal smelt

Country Status (1)

Country Link
SE (1) SE463499B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2695334A1 (en) * 1992-09-09 1994-03-11 Veitsch Radex Ag Feuerfeste Dry basic coating mass for molten metal product.
WO2000061319A1 (en) * 1999-04-14 2000-10-19 Styromagnesit Steirische Magnesitindustrie Gmbh Alkaline covering agent for melting bath surfaces and method for its production
CN103551536A (en) * 2013-10-17 2014-02-05 河南通宇冶材集团有限公司 Spray granulation covering agent for tundish and production method of spray granulation covering agent

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2695334A1 (en) * 1992-09-09 1994-03-11 Veitsch Radex Ag Feuerfeste Dry basic coating mass for molten metal product.
BE1007447A3 (en) * 1992-09-09 1995-07-04 Veitsch Radex Ag Mass collection basic product for dry metal fusion.
WO2000061319A1 (en) * 1999-04-14 2000-10-19 Styromagnesit Steirische Magnesitindustrie Gmbh Alkaline covering agent for melting bath surfaces and method for its production
CN103551536A (en) * 2013-10-17 2014-02-05 河南通宇冶材集团有限公司 Spray granulation covering agent for tundish and production method of spray granulation covering agent
CN103551536B (en) * 2013-10-17 2016-05-25 河南通宇冶材集团有限公司 A kind of tundish mist projection granulating coverture and production method thereof

Also Published As

Publication number Publication date
SE8703857L (en) 1989-04-08
SE8703857D0 (en) 1987-10-07

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