Improving the Yield of Sonochemical Precipitated Aragonite Synthesis by Scaling up Intensified Conditions. Issue 12 (1st December 2016)

• Record Type: Journal Article
• Authors: Santos, Rafael M.; Thijs, Jolien; Georgakopoulos, Evangelos; Chiang, Yi Wai; Creemers, Ann; Van Gerven, Tom
• Is Part Of: Chemical engineering communications. Volume 203:Issue 12(2016)
• Page Start: 1671
• Page End: 1680
• Publication Date: 2016-12-01
• Subjects: Aragonite -- Intensified process -- Particle morphology -- Polymorph -- Precipitated calcium carbonate -- Ultrasound; Chemical engineering -- Periodicals; 660.205
• DOI: 10.1080/00986445.2016.1230105
• Languages: English
• ISSNs: 0098-6445

Abstract

Abstract : Precipitated aragonite can be synthesized at relatively low temperatures by combining the application of low-frequency sonication with the use of magnesium chloride additive, as demonstrated by our prior study. In the present study, new process conditions were found that promote aragonite formation while accelerating and increasing the reaction yield. It was found that Mg-to-Ca molar ratio of 3:1, together with higher slurry concentration (74 g/L Ca(OH)2 ) and higher power-to-volume ratio (800 W/L gross, achieved by reducing slurry volume), promoted the aragonite formation while working at a higher CO2 flow rate (2.0 NL/min), and consequently higher precipitated calcium carbonate production rate (1 g/(L · min) CaCO3 ). The yield was thus improved while conserving the desired product properties as follows: high polymorph purity (95.7 wt%), small and narrow particle size distribution ( D [3, 2] = 0.74 µm), and unique shape (hubbard squash-like) .