Forsterite-rich refractory sand composition

Details Forsterite-rich refractory sand composition Forsterite-rich refractory sand composition

1994-06-08

1995-09-26

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Refractory

501133, 501154, 501 99, 423331, C04B 3516

Patent

active

054534089

ABSTRACT:
A synthetic forsterite-rich refractory sand composition for use as a taphole nozzle refractory sand for a sliding gate system of a steel ladle, the synthetic forsterite-rich sand composition including a mixture, the mixture including: a) a carbon bridging agent, the carbon bridging agent being present in the mixture in a proportion of from 5 to 15 percent by weight of the mixture; and b) a synthetic forsterite-rich sand, the synthetic forsterite-rich sand being free-flowing, having a MgO:SiO.sub.2 weight ratio of at least 1.2, a specific gravity of approximately 3 g/cm.sup.3, a void volume of less than approximately 50 percent by volume of the synthetic forsterite-rich refractory sand, and a fusion point of at least 1610.degree. C. At least 50 percent by weight of the synthetic forsterite-rich sand is forsterite; and from 8 to 27 percent by weight of the synthetic forsterite-rich sand is maghemite.

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