| 摘要 |
Porous silicate granulate contains glass and a glassy crystalline component consisting of (in wt. %) 45-85 SiO2, 5-20 alkali oxide, 5-30 alkaline earth oxide and 2-30 other oxides such as Al2O3 and/or Fe2O3. The glassy crystalline component is the sintered reaction product of a mixture containing ground quartz and/or other pure finely ground SiO2 carrier, ground clay, Portland clay, sodium hydroxide solution and an expanding agent as additive. An independent claim is also included for a process for the production of the silicate granulate comprising agglomerating a mixture of ground glass, ground quartz and/or other pure finely ground SiO2 carrier, ground clay, Portland clay, sodium hydroxide solution and an expanding agent as additive at 20-150 [deg]C, crushing the intermediate product, heating the intermediate product at 700-1,250 [deg]C, and expanding.
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