Bonded fused grain basic refractory and batch therefor

Details Bonded fused grain basic refractory and batch therefor Bonded fused grain basic refractory and batch therefor

1974-06-17

1976-01-06

Poer, J.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 58, 106 63, C04B 3502, C04B 3504, C04B 3548

Patent

active

039308740

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.

REFERENCES:
patent: 2572688 (1951-10-01), Austin
patent: 3141784 (1964-07-01), King et al.
patent: 3262795 (1966-07-01), Davies et al.
patent: 3715222 (1973-02-01), Hieb

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