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Coagulation/flocculation of a suspension of silica SiO2 was carried out with the use of macromlecular organic polymers which supported the action of two inorganic coagulants – PACl and Al₂(SO₄)₃. The results indicate the exceptional effectiveness of cationic and anionic flocculants in coagulation with Al₂(SO₄)₃ and an anionic polymer P 2540 in combination with PACl. They also show the correlation...