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

Claim 13:
14. A method comprising:
using a refractory product for lining of cement rotary kilns, where the refractory product comprises 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.