FIELD: chemistry.
SUBSTANCE: invention can be used in chemical industry and in processing of the industrial and agriculture waste materials. The rice hulls undergo the treatment with aqueous alkaline solution in ratio rice hulls : solid NaOH : water =1:(0.4÷1.0):(5÷10) at temperature 120-250°C. The rice hulls can undergo the preliminary acid treatment at temperature 100-250°C.
EFFECT: claimed invention allows to separate for further use silicon dioxide and organic parts of rice hulls.
2 ex
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