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Blast furnace hearth refractory and coke ash mineral interactions

Conference Paper


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Abstract


  • In the blast furnace hearth the calcium aluminate by-products

    of coke dissolution can react with the hearth refractories.

    Reactions between these coke ash minerals and the

    aluminosilicate and alumina-carbon hearth refractories may

    result in increased refractory wear reducing the blast furnace

    campaign life. Hence improved understanding of these

    interactions may have implications for the campaign life of the

    blast furnace hearth refractory materials.

    The interactions between the coke ash minerals and

    aluminosilicate hearth refractory have been assessed by

    heating samples of calcium aluminates (CA, CA2 & CA6)

    coupled with aluminosilicate refractory to temperatures

    representative of the blast furnace hearth (1450°C to 1550°C)

    in an inert atmosphere over a range of reaction times (4 - 24

    hours).

    It was found that there was significant reaction between the

    refractory, CA and CA2 but little reaction with the CA6. The

    reaction layers formed at the interface between the couples

    were found to consist of CA2, CA6, corundum, plagioclase

    and melilite. The formation of a layer with these phases is

    likely to cause refractory wear due to reduced mechanical

    strength at highest operating temperatures and by spalling

    induced by volume changes and changes in thermal expansion

    characteristics.

    From assessment of the kinetics of the system it was found

    that the aluminosilicate refractory followed the linear rate law

    for reactions with CA and CA2. Given the lack of reaction of

    the refractory with CA6 little comment can be made on the

    kinetics other than they are slow.

UOW Authors


  •   Drain, Phillip (external author)
  •   Chapman, Michael W. (external author)
  •   Nightingale, Bob J. (external author)
  •   Monaghan, Brian

Publication Date


  • 2013

Citation


  • Drain, P. B., Chapman, M. W., Nightingale, R. J. & Monaghan, B. J. (2013). Blast furnace hearth refractory and coke ash mineral interactions. Chemeca 2013: Challenging Tomorrow (pp. 270-277). Australia: Institution of Engineers Australia.

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2700&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/1691

Start Page


  • 270

End Page


  • 277

Place Of Publication


  • http://search.informit.com.au/documentSummary;dn=880503612355455;res=IELENG

Abstract


  • In the blast furnace hearth the calcium aluminate by-products

    of coke dissolution can react with the hearth refractories.

    Reactions between these coke ash minerals and the

    aluminosilicate and alumina-carbon hearth refractories may

    result in increased refractory wear reducing the blast furnace

    campaign life. Hence improved understanding of these

    interactions may have implications for the campaign life of the

    blast furnace hearth refractory materials.

    The interactions between the coke ash minerals and

    aluminosilicate hearth refractory have been assessed by

    heating samples of calcium aluminates (CA, CA2 & CA6)

    coupled with aluminosilicate refractory to temperatures

    representative of the blast furnace hearth (1450°C to 1550°C)

    in an inert atmosphere over a range of reaction times (4 - 24

    hours).

    It was found that there was significant reaction between the

    refractory, CA and CA2 but little reaction with the CA6. The

    reaction layers formed at the interface between the couples

    were found to consist of CA2, CA6, corundum, plagioclase

    and melilite. The formation of a layer with these phases is

    likely to cause refractory wear due to reduced mechanical

    strength at highest operating temperatures and by spalling

    induced by volume changes and changes in thermal expansion

    characteristics.

    From assessment of the kinetics of the system it was found

    that the aluminosilicate refractory followed the linear rate law

    for reactions with CA and CA2. Given the lack of reaction of

    the refractory with CA6 little comment can be made on the

    kinetics other than they are slow.

UOW Authors


  •   Drain, Phillip (external author)
  •   Chapman, Michael W. (external author)
  •   Nightingale, Bob J. (external author)
  •   Monaghan, Brian

Publication Date


  • 2013

Citation


  • Drain, P. B., Chapman, M. W., Nightingale, R. J. & Monaghan, B. J. (2013). Blast furnace hearth refractory and coke ash mineral interactions. Chemeca 2013: Challenging Tomorrow (pp. 270-277). Australia: Institution of Engineers Australia.

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2700&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/1691

Start Page


  • 270

End Page


  • 277

Place Of Publication


  • http://search.informit.com.au/documentSummary;dn=880503612355455;res=IELENG