Process for producing heat-insulating material and heat-insulating material with a skeleton bonded with calcium hydrosilicate with great number of pores

摘要

The invention relates to a process for producing heat-insulating material from silicate-containing material, hydrated lime, water, foam and reactive aluminates-containing quick-setting cement, from which a pourable raw mixture is produced. As silicate-containing material, quartz powder with a specific surface area according to BET of at least approximately 3 me2/g, in particular approximately 4 to 5 me2/g, is used. The raw mixture if solid components, foam a water is produced with a weight ratio of water/solids (excluding foam) ranging from 1.25 to 1.85 in dependence on total surface of the solid particles, whereby this raw mixture contains hydrated lime with a surface area according to BET of at least 15 me2/g, in amount being equal to stoichiometric amount that is needful for complete conversion of the quartz powder and the reactive aluminates. Subsequently the mixture is poured into molds in order to form raw products, which are after sufficient setting, demolded with the exception