flocculation of hematite fines by anionic polyacrylamide in saudi arabia

flocculation of hematite fines by anionic polyacrylamide in saudi arabia
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  • How is an anionic polyacrylamide flocculant synthesized?
  • In this study, an anionic polyacrylamide flocculant was synthesized by ultrasonic initiated template copolymerization (USTP), using sodium allylsulfonate (SAS) and acrylamide (AM) as monomers, poly diallyl dimethyl ammonium chloride (polyDADMAC) as template, and 2,2′-azobis [2- (2-imidazolin-2-yl) propane] dihydrochloride (VA-044) as initiator.
  • Does microblock structure improve flocculation performance of hematite particles?
  • The flocculation experiments of hematite particles showed that TPAS with microblock structure had better flocculation performance. The anionic block on TPAS was beneficial to enhance the charge neutralization, electrical patching, and adsorption bridging capability.
  • Does flocculant dosage affect the structure of hematite flocs?
  • The flocculant dosage could affect the structure of hematite flocs, and the Df of PAM, APAS, and TPA were different between 1.25 and 1.53. Only when a proper amount of flocculant acted on hematite colloid particles was a compact floc structure formed.
  • Why do hematite flocculants repulsion if charge neutralization is too strong?
  • Because when the charge neutralization is too strong, the excessive anionic units generate electrostatic repulsion among flocs and make hematite flocs become stable in solution again. Meanwhile, compared with the other two flocculants, the APAM-T showed the best flocculation performance.