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  • Are coagulants used in coal slurry flocculation?
  • As there is no detailed review paper regarding coal slurry treatment by coagulation/flocculation, this paper aims to review the recent studies on the use and application of different coagulants and polymeric flocculants in the coal slurry flocculation process.
  • Can cationic flocculants be used in coal tailing slurry?
  • Flocculation experimental results of coal tailing slurry using cationic flocculants show that a high dosage of cationic flocculants is needed to obtain a high settling rate. For this reason, these flocculants are not extensively used in coal preparation plants for solid-liquid separation purposes.
  • Can flocculants be used in wastewater treatment?
  • The potential application of conventional flocculants, bio-flocculants and grafted flocculants in wastewater treatment has been verified and well investigated.
  • How do cationic flocculants affect the surface charge of coal tailings?
  • Since the colloidal particles in coal tailings carry a negative charge at a neutral to slightly alkaline pH range, the adsorption of cationic flocculants onto their surfaces reduces their surface charge and decreases the repulsive electrical force between suspended areas particles [ 93 ].