FIELD: chemistry.
SUBSTANCE: invention relates to the technology of processing mineral material and can be used to produce amorphous silicon dioxide from rice husks. The method producing amorphous silicon dioxide from rice husks involves washing rice husks with deionised water in an ultrasonic field in cavitation mode while heating to 90°C, for 10 minutes at frequency of 20 kHz and 20 minutes at frequency of 35-60 kHz, respectively. Carbonisation is then carried out, as well as grinding the ash and oxidising roasting in a reactor lined with quartz glass, while constantly stirring in a current of cleaned air and raising temperature at not more than 10°C/min.
EFFECT: invention enables to obtain, using an ecologically clean method, amorphous silicon dioxide with purity of up to 99,99%, specific surface area of up to 420 m2/g and particle size of 10-80 nm.
3 cl, 5 ex
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|---|---|---|---|
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|
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