@article{MAKHILLJEAS202116519534,
    title = {Designing of Synthesizing High Purity Silica by Decarbonization of Rice Husks by Air Flow
Firing and Subsequently Hot Water Treatment of the Resulting Rice Husk Ash},
    journal = {Journal of Engineering and Applied Sciences},
    volume = {16},
    number = {5},
    pages = {182-185},
    year = {2021},
    issn = {1816-949x},
    doi = {jeasci.2021.182.185},
    url = {https://makhillpublications.co/view-article.php?issn=1816-949x&doi=jeasci.2021.182.185},
    author = {Hidetoshi,Tetsuya,Yuki,Michiko and},
    keywords = {Rice husk,silica,purify,potassium},
    abstract = {Rice husk was fired at 400~1000°C under air
flow and a white color rice husk ash was obtained. IR
spectral data confirmed the absence of water (-OH group)
and organics in the rice husk ash obtained after firing at
low-temperatures (<700&deg;C). XRD spectra revealed that
the rice husk ash obtained at <700&deg;C was amorphous and
that the rice husk ash fired at 1000&deg;C crystallized to the
cristobalite phase. The rice husk ashes fired at 400 and
700&deg;C were treated with ion-exchanged water at 80&deg;C.
Potassium and phosphorus were removed from these rice
husk ashes by the hot water treatment, after which the
potassium content in these rice husk ashes (fired at 400
and 700&deg;C) decreased from 5% (before treatment) to
1.5% (after treatment). Summarizing, it was demonstrated
that the silica in rice husk can be obtained in high purity
by the above-described series of treatments.}
    }