Preparation of Ultrafine SiO2 from Acid Leaching Residue of Zinc Oxide Ore

Abstract

Ultrafine SiO2 powder was successfully obtained by carbonating the NaOH leaching solution of the acid leaching residue of zinc oxide ore. The influences of flow rate of CO2 and carbonation temperature on the properties of SiO2 were discussed. Ultrafine SiO2 powder was characterized using XRD, SEM and FT-IR. The thermal analysis of ultrafine SiO2 powder was also investigated from room temperature to 1000 ℃ . The results showed that the ultrafine SiO2 powder was amorphous, uniformly spherical particles and distributed in a narrow range.