Niğde Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

Yazarlar: Vildan ÖNEN, Muhammed GÖÇER, Hasan Ali TANER

Konular:Mühendislik, Ortak Disiplinler

DOI:10.28948/ngumuh.386810

Anahtar Kelimeler:Kaolin,Dewatering,Polymer,Metal salts,Zeta potential

Özet:    Kaolin tailings are commonly generated in the mineral industry. They are invariably negatively charged and consequently tend to form stable dispersions with poor flocculation characteristics. Coagulation–flocculation treatments are suitable methods for removing colloidal particles from wastewater. In this study, the effects of mono/multivalent ions (coagulants) and polymers (flocculants) on the sedimentation and electrokinetic behaviours of kaolin have been investigated. In experimental studies, Al2(SO4)3, FeCl3, MgCl2, CaCl2, NaCl were used as coagulant, while as flocculant anionic (A150), cationic (C521) and nonionic (N100) polymers were used. Isoelectric point of kaolin was determined as pH 4.2. The effectiveness of coagulants increased with the increase in the ionicity degree of the metal ions. Among the coagulants, FeCl3 provided the highest efficiency (91%). Low sedimentation velocities (6.3-12.2 mm/min) were obtained with coagulants. The highest sedimentation efficiency (94%) was achieved with anionic flocculants and the same sedimentation velocity (58 mm/min) was reached with all flocculants. 

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