Refractory sand composition

Details Refractory sand composition Refractory sand composition

1995-09-13

1996-11-19

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

501101, 501108, 501155, 423331, C04B 3504, C04B 3516

Patent

active

055762557

ABSTRACT:
Compositions for refractory materials and methods for providing the compositions are described. A synthetic forsterite-rich refractory sand composition includes a mixture. The mixture includes: a) a carbon bridging agent, the carbon bridging agent being present in the mixture in a proportion of from approximately 5 to approximately 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 approximately 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 sand, and a fusion point of at least approximately 1610.degree. C., wherein i) at least approximately 50 percent by weight of the synthetic forsterite-rich sand is forsterite, and ii) from approximately 3 to approximately 27 percent by weight of the synthetic forsterite-rich sand is maghemite. The compositions and methods provide advantages in that the resulting refractory product have suitable characteristics with respect to size distribution, packing ability, thermal resistance and sintering properties for utilization as ladle sand or for similar refractory uses.

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