Precipitated Silica from Pumice and Carbon Dioxide Gas (Co₂) in Bubble Column Reactor

Precipitated silica from silica and carbon dioxide gas has been studied successfully. The source of silica was obtained from pumice stone while precipitation process was carried out with carbon dioxide gas (CO₂). The sodium silicate solution was obtained by extracting the silica from pumice stone with sodium hydroxide (NaOH) solution and heated to 100 °C for 1 h. The carbon dioxide gas is injected into the aqueous solution of sodium silicate in a bubble column reactor to form precipitated silica. m²/g. The results indicate that the products obtained are precipitate silica have surface area in the range of 100 – 227 m²/g, silica concentration more than 80%, white in appearance, and silica concentration reached 90% at pH 7.