Process for producing heat-insulating material

Details Process for producing heat-insulating material Process for producing heat-insulating material

C - Chemistry, Metallurgy

04

B

C04B 28/22 (2006.01) C04B 28/06 (2006.01) C04B 28/18 (2006.01)

Patent

CA 2125364

The invention relates to a process for producing heat-insulating material from silicate-containing material, hydrated lime, water, foam and a reactive aluminates-containing quick-setting cement, from which a pourable raw mixture is produced which is poured into moulds, the green mouldings formed in the moulds being demoulded and autoclaved after sufficient setting. To achieve very low bulk densities, it is provided that, as silicate-containing material, a quartz powder with a specific surface area according to BET of at least approx. 3 m2/g, in particular approx. 4 to 5 m2/g. is used, the raw mixture is produced with a weight ratio of water/solids (excluding foam) of at least approx. 1.25 and an essentially stoichiometric amount, with respect to the virtually complete reaction o~ the quartz powder and the reactive aluminates, of hydrated lime with a surface area according to BET of at least approx. 15 m2/g and the green mouldings poured into moulds are, after sufficient setting, demoulded with the exception of a mould base and are autoclaved disposed on the mould base.

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