PROCESS FOR THE PREPARATION, PREFERABLY FROM WASTE MATERIALS, OF SILICATE FOAM WITH CLOSED PORES,

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The process of the invention characterised in that to 100 parts by weight of a silicate powder having 2000-8000 m2/g specific surface; 1-10 parts by weight of gas-forming material with particle size of 10-100 pm and 0.5-15 parts by weight of montmorillonite, 0.5-2 parts by weight of alkali hydrogen phosphate or alkali dihydrogen phosphate or a mixture of alkali metal phosphate and sodium silicate in form of aqueous solution, 0.01-5 parts by weight of rare earth metal oxide or a mixture of such oxides were added, then the mixture obtained is homogenised, pro-dried, coated with 1-5 parts by weight of titanium oxide and/or titanium oxide hydroxide and/or aluminium oxide hydroxide, then subjected to heat treatment at .720-1000°C, and the mixture obtained is moulded. The subject of the invention : also the product of the above process.