Refractory compound and binder therefor, method for the production and use thereof
AssigneeIntocast AG
InventorsManfred Knoll, Natalie Fröse
Life of this patent
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Abstract
The invention relates to an unshaped refractory compound, in particular, a casting compound, gunning compound and/or free-flowing compound, comprising a bond system which forms upon addition of water, and a dry micro-scale amorphous SiO2- binder as the sole binder, which is mixed in a proportion of ≤1% by weight of the total mass with the solid components to be bonded and forms the bond system after additional of 1-30% by weight of water. The invention further relates to a method for producing refractory compounds and a use of microcrystalline amorphous silicon dioxide in the production of refractory compounds.
Claims18
An unshaped refractory mass comprising:
- Al2O3;
- said Al2O3 constitutes up to 99.5 wt. % of said unshaped refractory mass;
- a source of said Al2O3 includes a source selected from one or more of fused corundum, tabular alumina, andalusite, fireclay, bauxite, mullite, quartz, and olivine;
- plasticizer;
- said plasticizer constitutes up to 5% by weight of said unshaped refractory mass;
- curing accelerator;
- said curing accelerator constitutes up to 15% by weight of said unshaped refractory mass;
- curing retardant;
- said curing retardant constitutes up to 15% by weight of said unshaped refractory mass;
- microscale amorphous powdered SiO2;
- said microscale amorphous powdered SiO2 constitutes up to 1% by weight of said unshaped refractory mass;
- said microscale amorphous powdered SiO2 has a purity of 90-99.9% by weight (in a dry state), a mean grain size of 1-50 μm, and a specific surface area of 50-350 m2/g;
- and a binder comprising microscale amorphous powdered SiO2 and water, wherein said microscale amorphous powdered SiO2 and water are the only binders for said unshaped refractory mass and
- additional additive;
- said additional additive includes two or more compounds selected from the group consisting of spinel, MgO, synthetic polyelectrolyte and PE fibers.
An unshaped refractory mass comprising:
- 80-99.5 wt. % Al2O3;
- 0.1-1 wt. % microscale amorphous SiO2;
- up to 5 wt. % plasticizer;
- up to 15 wt. % curing accelerator;
- up to 15 wt. % curing retardant;
- and
- additional additive;
- said additional additive includes spinel and one or more compounds selected from the group consisting of, MgO, synthetic polyelectrolyte and PE fibers;
- and
- a binder comprising microscale amorphous SiO2 and water, wherein said microscale amorphous SiO2 and water are the only binders for said unshaped refractory mass.
An unshaped refractory mass comprising 80-99.5 wt. % Al2O3;
- 0.1-1 wt. % microscale amorphous SiO2, said microscale amorphous SiO2 has a mean grain size of 1-50 μm and a specific surface area of 50-350 m2/g;
- up to 5 wt. % plasticizer;
- up to 15 wt. % curing accelerator;
- up to 15 wt. % curing retardant;
- and additional additive;
- said additional additive includes spinel and one or more compounds selected from the group consisting of a) MgO and wherein a maximum content of said MgO is 1 wt. % of said unshaped refractory mass, b) synthetic polyelectrolyte and wherein a maximum content of said synthetic polyelectrolyte is up to 1 wt. % of said unshaped refractory mass, and c) PE fibers and wherein a maximum content of said PE fibers is up to 1 wt. % of said unshaped refractory mass, and wherein a maximum content of said spinel is up to 20 wt. % of said unshaped refractory mass;
- and a binder comprising microscale amorphous SiO2 and water, wherein said microscale amorphous SiO2 and water are the only binders for said unshaped refractory mass.
A refractory mass composition that is formulated to be combined with water to form a binding system;
- said refractory mass composition comprises:
- 80-99.5 wt. % Al2O3;
- 0.1-1 wt. % microscale amorphous SiO2, said microscale amorphous SiO2 has a mean grain size of 1-50 μm and a specific surface area of 50-350 m2/g;
- and
- additional additive;
- said additional additive includes two or more compounds selected from the group consisting of a) MgO and wherein a maximum content of said MgO is 1 wt. % of said refractory mass composition, b) synthetic polyelectrolyte and wherein a maximum content of said synthetic polyelectrolyte is up to 1 wt. % of said refractory mass composition, c) PE fibers and wherein a maximum content of said PE fibers is up to 1 wt. % of said refractory mass composition, and d) spinel and maximum content of said spinel is up to 20 wt. % of said refractory mass composition;
- and a binder comprising microscale amorphous SiO2 and water, wherein said microscale amorphous SiO2 and water are the only binders for said unshaped refractory mass.
Dependencies are inferred from the claim text.