Fluidization Behavior of Cohesive Ca(OH)2 Powders Mixed with Hydrophobic Silica Nanoparticles. Issue 2 (6th December 2018)

• Record Type: Journal Article
• Authors: Amjadi, Omid; Tahmasebpoor, Maryam; Aghdasinia, Hassan
• Is Part Of: Chemical engineering & technology. Volume 42:Issue 2(2019)
• Page Start: 287
• Page End: 296
• Publication Date: 2018-12-06
• Subjects: Ca(OH)2 fluidization -- Fractal analysis -- Silica nanoparticles; Chemical engineering -- Periodicals; Chemical processes -- Periodicals; 660.05
• DOI: 10.1002/ceat.201800007
• Languages: English
• ISSNs: 0930-7516

Abstract

Abstract: Dry mixing with hydrophobic silica nanopowders was used to improve the fluidization quality of Ca(OH)2 particles which belong to the Geldart C group and, thus, normally cannot be fluidized. Three parameters, i.e., sieved size of Ca(OH)2 particles and sieved size and weight percentage of SiO2 nanoparticles were selected for experiments. A direct proportionality was found between the coverage quality of materials over each other and the fluidization behavior of their corresponding adsorbents. Optimum SiO2 size and concentration values were determined for the improvement of Ca(OH)2 fluidizability. The sieved size of Ca(OH)2 powder had no consequential effect on the coverage quality. The Richarson‐Zaki equation and fractal analysis combined with a modified Richardson‐Zaki approach were proposed for prediction of the fluidization quality and agglomerate size. Abstract : Ca(OH)2 particles, which are considered as important candidates for CO2 sorption, belong to the Geldart C group and, thus, normally cannot be fluidized. Dry mixing with hydrophobic silica nanopowders was successfully applied to improve the fluidization quality of such particles. By means of this purely physical treatment, the Ca(OH)2 powders were provided with fluidizable carriers.