Physical and chemical characterization of precipitated magnesium silicate from rice hull ash silica

摘要

Formation of synthetic magnesium silicate by precipitation from sodium silicate produced from rice hull ash silica and MgCl_(2) and MgSO_(4) solutions was investigated at four different reactant feed rate and two different temperatures (25 and 50 deg C). The final product was characterized by scanning Electron Microscopy (SEM), X-Ray diffraction (XRD) and TG/DTA analysis. Crystal size distribution (CSD) and filtration rate measurements were done. In order to define adsorptive properties of studied magnesium silicates isotherms of nitrogen adsorption/desorption on their surface were established. Brauner-Emmett-Teller (BET) surface area of magnesium silicate produced at investigated conditions were determined as 397 +- 10 m~(2)/g and 342 +- 5 m~(2)/g at 25 and 50 deg C respectively.