Extraction silica from rice husk with naoh leaching agent with temperature variation burning rice husk

Abstract

Silica can obtain by utilizing rice husk (RH). This study uses NaOH leaching agents with temperature variations of 600, 700, 800, 900oC at burning RH. Rice husk ash (RHA) reacted with NaOH 10% at 90°C at 240 rpm for 2 h, then the addition of HCl until pH 7 and drying to become SiO2. Extracted silica characterization using FTIR showed silanol and siloxy groups, XRD showed that silica dominates by quartz and calcite, XRF showed components of SiO2 and Si. Variation temperatures of 600, 700, 800, 900oC at burning RH made different components SiO2 and Si.