Investigations of chromium(III) oxide removal from the aqueous suspension using the mixed flocculant composed of anionic and cationic polyacrylamides.

•Cr2O3 suspension stability in ionic PAMs presence was determined using turbidimetry.•Mixed adsorption layers of AN PAM + CT PAM are formed at interface.•Mixture of adsorbates causes increase in removal efficiency of Cr2O3.•Dual-polymer flocculation occurs in suspensions containing both form of ionic PAM.•AN PAM + CT PAM complexes adsorption affects electrokinetic properties of particles.