Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9632991 | International Journal of Mineral Processing | 2005 | 10 Pages |
Abstract
The separation of fine-grained titania from silica is an important industrial problem as the demand for titania continues. In this study we demonstrate how high-purity, synthetic, micron and sub-micron silica and titania particles may be separated by selective aggregation from an aqueous suspension. Specific electrolyte concentration and suspension pH were chosen through a colloid stability analysis. High-efficiency (up to 99.6 wt.%) separation of titania from a mixed silica-titania suspension (50%Â :Â 50%) was achieved over a wide range of solid concentrations (0.03-2 wt.%) with an electrolyte concentration of 20 mM at pH 8. Analysis of the data revealed that separation efficiency improved as the solid concentration increased. The latter behaviour was attributed to a transition from 'free' to hindered settling of the flocs, which impacted on the entrapment of silica particles within titania flocs.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
David R.E. Snoswell, Jinming Duan, Daniel Fornasiero, John Ralston,