This work reports the use of PAA/PEG polymer as a dispersing medium for slurry compaction of HAp powders. Poly(acrylic acid) (PAA) modified with poly(ethylene glycol) (PEG) was used as dispersant in preparation of hydroxyapatite aqueous suspensions. HAp was natural origin, obtained from bone sludge via two-step procedure. The effect of dispersant structure on particle stabilization were investigated through physicochemical properties of suspensions. A novel HAp dispersions were characterized using pH, viscosity, rheology and sedimentation measurements.