Magnesia aggregate for refractory article and method for manufac

Details Magnesia aggregate for refractory article and method for manufac Magnesia aggregate for refractory article and method for manufac

1986-09-04

1988-04-05

Swisher, Nancy

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

428703, 4273761, 4273762, C04B 3332, C04B 3504

Patent

active

047358599

ABSTRACT:
A magnesia aggregate for a refractory article, which comprises: a core portion comprising magnesia; a covering layer excellent in slag penetration resistance, which comprises a refractory material excellent in slag penetration resistance and covers the surface of said core portion; and an intermediate layer excellent in slag penetration resistance, formed between said core portion and said covering layer through combination thereof. Said magnesia aggregate is manufactured by: forming, on the surface of a core portion which comprises magnesia and has a particle size of from 40 .mu.m to 10 mm, a covering layer which comprises a powdery refractory material excellent in slag penetration resistance and has a covering thickness of from 20 .mu.m to 2.0 mm, to prepare a green aggregate; and firing said green aggregate at a temperature of from 1,700.degree. to 2,200.degree. C. for a period of time of 4 to 10 hours, to form an intermediate layer excellent in slag penetration resistance between said core portion and said covering layer through combination thereof, thereby manufacturing a magnesia aggregate comprising said core portion, said covering layer and said intermediate layer.

REFERENCES:
patent: 3069292 (1962-12-01), Alexander et al.
patent: 3322515 (1967-05-01), Dittrich et al.
patent: 3987135 (1976-10-01), Eigner et al.
patent: 4593007 (1986-06-01), Novinski
patent: 4632876 (1986-12-01), Laird et al.

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