Bonded fused grain basic refractory and batch therefor
US3930874A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 17, 1974 |
| Grant date | Jan 6, 1976 |
| Priority date | — |
| Expiry date | Jun 17, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/0435
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Basic refractory batch of coarse and intermediate sized fused or dead-burned dolomitic grain with 20-35% of a fine fraction of dead-burned magnesia and an effective amount of a compound yielding not more than 4% by weight (preferably 0.5-2.5%) zirconia, silica, or mixtures thereof. The dolomitic grain is separated into 2 size fractions (both collectively in the range of -4+65 Tyler mesh) while the magnesite is all -100 Tyler mesh and preferably at least 75% -325 Tyler mesh. The zirconia and silica yielding materials are preferably substantially all -325 Tyler mesh. Formed shape made from the batch and burned at 1600.degree.C is characterized by a modulus of rupture at 1340.degree.C (hot strength) consistently above 1800 psi and occasionally approaching 3000 psi without a significant loss in corrosion resistance to molten basic oxygen furnace slags.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.