© Journal Of Chemical Society Of Nigeria (jcsn) . 2011. Vol. 36 No. 1
Publisher: Chemical Society of Nigeria
Determination of Silica Content of Rice Husk Ash At Various Combustion Temperatures and Time Using Particle Induced Xray Emission (PIXE) Spectrometric Technique
C. D. Igwebike- Ossi, J. A. Ibemesi
KEYWORDS: rice husk, rice husk ash, silica, combustion, PIXE
ABSTRACT:Rice husks were subjected to controlled incineration in a muffle furnace at varied temperatures and time in the range 400 - 10000C and 1-6hrs respectively, to obtain rice husk ash (RHA) samples. The silica contents of the ash samples were determined using the relatively new, and highly sensitive analytical technique, particle – induced X -ray emission (PIXE) spectrometry. The silica (SiO2) content of the ash was found to be in the range of 68-91%. The results indicate lower silica contents at lower incineration temperatures (400 to 6000C) at shorter combustion time of 1 to 4hrs while higher silica contents were found at increased combustion time of 5 to 6hrs and at higher temperatures (700 to 9000C). Above 7000C, prolonged combustion time of 5 – 6hrs had little or no effect on the silica yield.
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