| 摘要 |
<p>The present invention provides a method for dewatering dispersions of suspended solids by flocculation using a polymeric flocculant, comprising the steps of sequentially adding to the dispersions: - At least one water soluble, anionic linear polymer having a molecular weight of at least 1x106 g/mol, - A blend of a water-soluble, cationic structured first polymer having a molecular weight of at least 1x 106 g/mol, and a water-soluble, cationic linear second polymer having a molecular weight of at least 1 x 1 0^6g/mol. It has now unexpectedly been found that adding to a dispersion an anionic flocculant followed by a blend formed of structured, high molecular weight cationic polymers with linear, high molecular weight cationic polymers renders possible to achieve a better level of dewatering performance than the prior art.</p> |
