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Reactivity of coke ash on aluminosilicate blast furnace hearth refractories

Journal Article


Abstract


  • Blast furnace hearth refractories are a key component in achieving long furnace lives. These refractories

    can be degraded by among other things reactions with coke ash products. Recent studies have shown

    that these coke ash products could be calcium aluminate based. To understand and characterize the

    effects of these calcium aluminates on hearth refractories a study has been carried out that investigates

    the reaction kinetics of CaO.Al2O3, CaO.2Al2O3 and CaO.6Al2O3 in contact with an aluminosilicate blast furnace

    hearth refractory. The experimental program covered the temperature range 1 450° to 1 550°C. The

    temperatures were chosen to represent the hot face temperatures of the hearth refractories.

    From this study it was found that the rate of reaction with the aluminosilicate refractory and CaO.6Al2O3

    was much slower than that of CaO.Al2O3 and CaO.2Al2O3. The prevailing kinetics of the aluminosilicate

    refractory with CaO.Al2O3 and CaO.2Al2O3 was found to be consistent with the linear rate law. The slow

    rate of reaction of the refractory with CaO.6Al2O3 prohibited identification of the prevailing kinetic regime.

    In characterizing the reaction interface between the aluminosilicate and the calcium aluminates it was

    found that there was significant reaction between the refractory and CaO.Al2O3 and CaO.2Al2O3 but little

    reaction with the CaO.6Al2O3. The reaction layers formed at the interface between the couples were found

    to consist of CaO.2Al2O3, CaO.6Al2O3, corundum (Al2O3), plagioclase (CaO.Al2O3.2SiO2) and melilite

    (2CaO.Al2O3.SiO2). The formation of a layer with these phases could result in spalling/wear of the hearth

    refractory.

UOW Authors


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

Publication Date


  • 2014

Citation


  • Monaghan, B., Drain, P., Chapman, M. W. & Nightingale, R. (2014). Reactivity of coke ash on aluminosilicate blast furnace hearth refractories. ISIJ International, 54 (4), 810-819.

Scopus Eid


  • 2-s2.0-84903269274

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2801

Number Of Pages


  • 9

Start Page


  • 810

End Page


  • 819

Volume


  • 54

Issue


  • 4

Place Of Publication


  • https://www.jstage.jst.go.jp/browse/isijinternational

Abstract


  • Blast furnace hearth refractories are a key component in achieving long furnace lives. These refractories

    can be degraded by among other things reactions with coke ash products. Recent studies have shown

    that these coke ash products could be calcium aluminate based. To understand and characterize the

    effects of these calcium aluminates on hearth refractories a study has been carried out that investigates

    the reaction kinetics of CaO.Al2O3, CaO.2Al2O3 and CaO.6Al2O3 in contact with an aluminosilicate blast furnace

    hearth refractory. The experimental program covered the temperature range 1 450° to 1 550°C. The

    temperatures were chosen to represent the hot face temperatures of the hearth refractories.

    From this study it was found that the rate of reaction with the aluminosilicate refractory and CaO.6Al2O3

    was much slower than that of CaO.Al2O3 and CaO.2Al2O3. The prevailing kinetics of the aluminosilicate

    refractory with CaO.Al2O3 and CaO.2Al2O3 was found to be consistent with the linear rate law. The slow

    rate of reaction of the refractory with CaO.6Al2O3 prohibited identification of the prevailing kinetic regime.

    In characterizing the reaction interface between the aluminosilicate and the calcium aluminates it was

    found that there was significant reaction between the refractory and CaO.Al2O3 and CaO.2Al2O3 but little

    reaction with the CaO.6Al2O3. The reaction layers formed at the interface between the couples were found

    to consist of CaO.2Al2O3, CaO.6Al2O3, corundum (Al2O3), plagioclase (CaO.Al2O3.2SiO2) and melilite

    (2CaO.Al2O3.SiO2). The formation of a layer with these phases could result in spalling/wear of the hearth

    refractory.

UOW Authors


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

Publication Date


  • 2014

Citation


  • Monaghan, B., Drain, P., Chapman, M. W. & Nightingale, R. (2014). Reactivity of coke ash on aluminosilicate blast furnace hearth refractories. ISIJ International, 54 (4), 810-819.

Scopus Eid


  • 2-s2.0-84903269274

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2801

Number Of Pages


  • 9

Start Page


  • 810

End Page


  • 819

Volume


  • 54

Issue


  • 4

Place Of Publication


  • https://www.jstage.jst.go.jp/browse/isijinternational