Patent ID: 11905218
Assignee: REFRACTORY INTELLECTUAL PROPERTY GMBH & CO. KG
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  F | IPC C  F

Claim 10:
11. A refractory product comprising the following features:
the refractory product has a chemical composition according to which the following oxides are present in the following proportions:
MgO: at least 92% by mass;
Al2O3: 1.5 to 7% by mass;
Fe2O3: less than 3% by mass;
CaO+SiO2: 1 to 3% by mass;
the refractory product comprises coated grains having the following features:
the coated grains have a grain size of at least 2 mm;
the coated grains consist of magnesia, the surface of which has a coating of magnesia spinel at least in sections; and
the coating of magnesia spinel having a thickness in the range from 10 to 500 μm, wherein the refractory product is produced based upon a batch comprising the following features:
a first raw material component, consisting of grains of magnesia;
a second raw material component, consisting of batch coated grains, comprising the following features:
the batch coated grains have a grain size of at least 2 mm;
the batch coated grains consist of magnesia, the surface of which has a coating of alumina at least in sections.