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US 9,593,048 B2Granted
Alumina-magnesia product for gasifier or for metallurgical furnace
AssigneeSaint-Gobain Centre De Recherches Et D'Etudes Europeen
InventorsEric Jorge, Olivier Francy
Life of this patent
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Abstract
The invention relates to a melted and cast refractory product having a chemical composition such that, in mass percentages on the basis of the oxides: AI2O3: complement up to 100%; MgO: 26% to 50%; ZrO2: 0.5% to 10.0%; B2O3: <1.5%; SiO2: ≦0.5%; Na2O+K2O: ≦0.3%; CaO: ≦1.0%; Fe2O3+TiO2: <0.55%; other oxide species: <1.0%. In said product, the elementary mass ratio R of the zirconium content to the total boron, fluorine and silicon content is between 2 and 80.
Claims19
A fused-cast refractory product having a chemical composition such that, in percentages by weight on the basis of the oxides:
- Al2O3:
- balance to 100%;
- MgO:
- 26% to 50%;
- ZrO2:
- 0.5% to 10.0%;
- B2O3:
- ≦1.5%;
- SiO2:
- ≦0.5%;
- Na2O+K2O:
- ≦0.3%;
- CaO:
- ≦1.0%;
- Fe2O3+TiO2:
- <0.55%;
- other oxide species:
- <1.0%;
- provided that an elementary weight ratio R of the content of zirconium Zr to the total content of boron B. fluorine F and silicon Si is between 2 and 80.
16 more elements
Dependencies are inferred from the claim text.