GU Jie, LIU Bin, FANG Fang, et al. Extraction and characterization of SiO2 from rice-husk-char[J]. CIESC Journal, 2014, (8): 3277-3282. DOI: 10.3969/j.issn.0438-1157.2014.08.058.
GU Jie, LIU Bin, FANG Fang, et al. Extraction and characterization of SiO2 from rice-husk-char[J]. CIESC Journal, 2014, (8): 3277-3282. DOI: 10.3969/j.issn.0438-1157.2014.08.058.DOI:
The objective of this study is to develop a simple and green procedure for preparing SiO2 from rice husk char. The raw material
rice husk char from downdraft fixed bed gasification was used to extract SiO2 by adding K2CO3. To find the influence of extraction and aging conditions on SiO2 yield
the experiments were conducted. The results showed that the optimum conditions were as follows: the impregnation ratio of K2CO3 solution (mass fraction of 20%) to rice husk char was 3.0
the extraction time 3.5 h. The temperature and time of aging was 3℃ and 3 h
respectively. At these conditions
SiO2 yield was 25.89% and purity 97.02% after acid treatment. The structure and property of SiO2 were analyzed using SEM
EDX
and XRD. The results indicated that it could be a practical way for the high efficiency
environmental-friendly and resource utilization of rice husk char.