EVALUASI PENGARUH KONSENTRASI NAOH TERHADAP RENDEMEN DAN KETERBATASAN PROSES EKSTRAKSI SILIKA DARI ABU KERAK BOILER PABRIK KELAPA SAWIT
DOI:
https://doi.org/10.47199/jaf.v8i1.432Keywords:
Boiler ash, Silica, NaOH, Palm oil mill waste.Abstract
Palm oil mill boiler ash is a biomass waste with significant potential as a silica (SiO2) source; however, its utilization remains limited. This study aims to evaluate the effect of sodium hydroxide (NaOH) concentration on silica yield and to identify the limitations of the extraction process. The novelty of this study lies in its evaluative approach, which not only examines yield trends but also systematically assesses process constraints. Silica was extracted using a solid–liquid extraction method with varying NaOH concentrations (1 M, 3 M, and 5 M) at approximately 75°C for 60 minutes, followed by precipitation using HCl and drying. Composition analysis was conducted using X-Ray Fluorescence (XRF), while statistical analysis was performed using ANOVA. The results showed an increasing trend in silica yield from 20.93% to 54.97% with higher NaOH concentration. However, ANOVA results indicated that this effect was not statistically significant, suggesting process variability within the extraction system. XRF analysis also detected residual chlorine, indicating limitations in the purification stage. These findings suggest that silica extraction is influenced not only by NaOH concentration but also by operational factors such as material homogeneity and washing efficiency, highlighting the need for further process optimization.
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