polyacrylamide flocculation of chromite ore at ireland

polyacrylamide flocculation of chromite ore at ireland
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  • Does flocculant dosage affect settling rate of chromite ore tailings?
  • Effect of flocculant dosage on settling rate Batch sedimentation studies were carried out to measure the settling rate of chromite ore tailings using anionic, cationic and non-ionic polyacrylamide flocculants (Alstafloc 40, 60, 107, 155,155X, 155XX and 50) of different ionicity and molecular mass.
  • Does cationic polyacrylamide improve flocculation properties?
  • The results showed that the flocculation properties improved for the anionic flocculants having the low anionic strength and molecular weight, whereas, cationic flocculants performed better at the higher cationic strength and molecular weight. The non-ionic polyacrylamide is ineffective to flocculate the tailings particle.
  • Are cationic and ionic flocculants suitable for sedimentation of chromite tailings?
  • Both ionic and cationic flocculants are suitable for the sedimentation of chromite tailings. The results showed that the flocculation properties improved for the anionic flocculants having the low anionic strength and molecular weight, whereas, cationic flocculants performed better at the higher cationic strength and molecular weight.
  • Why do polyacrylamide solutions age?
  • The ageing of polyacrylamide solutions was first reported as a change in solution viscosity over a period of weeks or months. Narkis and Rebhun (1966) explained this in terms of a disentanglement of polyacrylamide molecules that were agglomerated during the polymerisation process.