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

Claim 0:
1. A refractory product comprising the following features:
1.1 the product has a chemical composition according to which the following oxides are present in the following proportions:
1.1.1 MgO: at least 92% by mass;
1.1.2 Al2O3: 1.5 to 7% by mass;
1.1.3 Fe2O3: less than 3% by mass;
1.1.4 CaO+SiO2: 1 to 3% by mass;

1.2. the product comprises coated grains having the following features:
1.2.1 the coated grains have a grain size of at least 2 mm;
1.2.2 the coated grains consist of magnesia, the surface of which has a coating of magnesia spinel at least in sections; and
1.2.3 the coating of magnesia spinel having a thickness in the range from 10 to 500 μm.