SELECTIVE DETACHMENT OF SILICA FROM COATTACHED SILICA AND HEMATITE PARTICLES ON GLASS-BEADS

The detachment of fine particles of silica (0.12 mu m) and hematite (0 .10 mu m) coattached on glass beads (80 mu m) in aqueous solution were studied as a function of pH and electrolyte concentration. Detachment occurs at alkaline conditions wherein the surface potentials of the p articles and collector are negative. The selective separation of silic a particles being governed by the balance of short range forces, which are affected by increasing the pH and electrolyte concentration.