Extraction of high-purity silica from rice husk via hydrochloric acid leaching treatment

Authors

SEITKHAN AZAT
ZHANAR SARTOVA
KALAMPYR BEKSEITOVA
KYDYR ASKARULY

DOI

10.3906/kim-1903-53

Abstract

The present paper aimed at the investigation of the effect of preliminary acid treatment on the structure and purity of extracted silica. In this study, the acid leaching of rice husk (RH) in 2 M hydrochloric acid solution before the calcination process at 600 $^{\circ}$C was proposed to achieve completely white silica with high specific surface area and low content of impurities. RH, selected from the Almaty Region, Kyzylorda Region, and Turkestan Region was used as the main silica source. The results confirmed that the highest purity (98.2%-99.7%) amorphous silica with a specific surface area between 120 and 980 m$^{2}$ g$^{-1}$ could be extracted during acid treatment and controlled calcination. The structure is amorphous, porosity diameter decreased from 26.4 nm to 0.9 nm, and specific pore volume increased from 0.5 to 1.2 cm$^{3}$ g$^{-1}$.

Keywords

Rice husk, rice husk ash, silica, hydrochloric acid leaching

First Page

1258

Last Page

1269

Recommended Citation

AZAT, SEITKHAN; SARTOVA, ZHANAR; BEKSEITOVA, KALAMPYR; and ASKARULY, KYDYR (2019) "Extraction of high-purity silica from rice husk via hydrochloric acid leaching treatment," Turkish Journal of Chemistry: Vol. 43: No. 5, Article 4. https://doi.org/10.3906/kim-1903-53
Available at: https://journals.tubitak.gov.tr/chem/vol43/iss5/4