| 摘要 |
The present invention relates to a compacted sodium silicate is provided having a molar ratio SiO2:Na2O from 1.6 to 3.3, characterized in that the silicate has the following properties:a bulk density of above 500 g/l,a porosity of above 190 ml/kg, anda mechanical strength corresponding to a dust percentage of below 40 wt %.Also provided is a process for preparing such silicate comprising the steps of:spray-drying an aqueous solution of sodium silicate with a molar ratio SiO2:Na2O from 1.6 to 3.3, applying an outlet temperature above 114° C.,applying a water glass solution to the spray-dried powder,subjecting the water glass treated powder to a compacting step, applying a pressure below 100 bar, andcrushing the resulting flakes having a thickness of above 4 mm to obtain the compacted sodium silicate.
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