refractory sand

refractory sand

[ri′frak·trē ¦sand]
(materials)
Sand used for refractory which is capable of resisting high temperatures.
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References in periodicals archive ?
The counter-current rotating action of the mixing arms can produce a homogenous batch of refractory sand, conditioned waste dust and other materials in as time as 60 seconds.
Special refractory sands such as zircon or chromite are recommended for breaker cores on feeders greater than 8-in.