Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 8, Issue 28, Pages 10369-10379Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.0c01484
Keywords
Rice husk; Combustion; Biogenic silica; Impurities behaviors; Surface and bulk analyses; Ash melting
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Funding
- German Federal Ministry of Food and Agriculture (BMEL) based on a decision of the Parliament of the Federal Republic of Germany via the Federal Office of Agriculture and Food (BLE)
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Highly pure biogenic silica can be obtained from rice husk ash if agglomeration and ash melting during combustion can be avoided. In the present study, the effects of fuel pretreatment and combustion temperature on the properties of the ash samples from rice husk combustion were investigated. In this respect, the chemical compositions of the bulk and outer surface and morphology of the obtained rice husk ash were evaluated. Compositions of the bulk ashes were analyzed with X-ray fluorescence and inductively coupled plasma with optical emission spectroscopy, while surface compositions were obtained from X-ray photoelectron spectroscopy. Images from a scanning electron microscope were used to evaluate the morphologies of the ash samples. Results showed that the concentrations of metal impurities on the surfaces of the ashes were higher than in the bulks. In pretreated rice husk ash samples, the levels of metal impurities decreased considerably on the surfaces. Consequently, ash melting was obviated, and powdery ashes without any agglomeration were obtained.
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