THE EFFECT OF NANO-SIZED Fe2O3 ADDITION ON DENSIFICATION AND HYDRATION RESISTANCE OF MgO‒CaO REFRACTORIES

S. G. Kahrizsangi; A. Nemati; A. Shahraki

doi:10.17073/1683-4518-2016-5-49-53

THE EFFECT OF NANO-SIZED Fe2O3 ADDITION ON DENSIFICATION AND HYDRATION RESISTANCE OF MgO‒CaO REFRACTORIES

S. G. Kahrizsangi, A. Nemati, A. Shahraki

https://doi.org/10.17073/1683-4518-2016-5-49-53

Full Text:

Abstract

In this work the effect of nano-sized Fe₂O₃ on densification and hydration resistance of MgO‒CaO refractories was investigated. Nano-sized Fe₂O₃ were added to MgO‒CaO refractories with 2, 4, 6 and 8 wt. % as additives. The hydration resistance was measured by changing the weight of samples after 72 hrs in 25 ℃ and 95 % relative humidity. Results showed that when the amount of the added nano-sized Fe₂O₃ increased to 8 wt. % the bulk density increased to 3,14 g/cm³ and apparent porosity decreased to 8,20 %. For sample without addition, the mass gain after 72 hours was 1,68 %, which was sharply decreased to 1,27 % by increasing the amount of nanosized Fe₂O₃. Nano-sized Fe₂O₃ addition led to the formation of some low melting phases such as C₂F (2CaO· Fe₂O₃), CF (CaO·Fe₂O₃) and C₃A (3CaO·Al₂O₃). The formation of these low melting point phases surrounded the CaO and MgO grain, grain boundaries and thus promoted densification of MgO‒ CaO refractories.

Keywords

MgO‒CaO refractories, hydration, densification, nano-sized Fe2O3, liquid phase,

About the Authors

S. G. Kahrizsangi

Шарифский университет технологии, Тегеран
Iran, Islamic Republic of

A. Nemati

Шарифский университет технологии, Тегеран
Iran, Islamic Republic of

A. Shahraki

Шарифский университет технологии, Тегеран
Iran, Islamic Republic of

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Supplementary files

For citation: Kahrizsangi S.G., Nemati A., Shahraki A. THE EFFECT OF NANO-SIZED Fe2O3 ADDITION ON DENSIFICATION AND HYDRATION RESISTANCE OF MgO‒CaO REFRACTORIES. NOVYE OGNEUPORY (NEW REFRACTORIES). 2016;1(5):49-53. https://doi.org/10.17073/1683-4518-2016-5-49-53

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