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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