SUMMARY
Polymer conformation/orientation plays an important role in polymeric solid-liquid separation processes. However, very little information is available on the mechanisms by which conformation/orientation of polymers determines the flocculation/dispersion of fines, and on the means for controlling polymer configuration to achieve the desired state of colloidal stability. In this study, attempts were made to alter the conformation/orientation of polyacrylic acid by a number of methods, eg., (i) sequential pH-shifting (pH 10 to 4), (ii) interaction between polyacrylic acid and polydimethylallylarnmonium chloride, and (iii) complexation of polyacrylic acids with dissolved mineral species. Changes in the polyacrylic acid conformation/orientation were then correlated with the stability of the suspensions, the charge on the particles and the extent of polymer adsorption on alumina. Results obtained, showed that manipulation of polymer conformation/orientation of polyacrylic acid in-situ or prior to adsorption can significantly improve solid/liquid separation.