3.1. The effect of the treatment with DAA or PVA wetting reagent on the floatability of
polymers
The aqueous solution was treated with DAA or PVA of concentrations of up to 0.1
kg/m3. The MIBC frother concentration was 0.06 kg/m3 and the pH of the solution was 7.
Fig. 4 shows the floatability of PET, PE and PP as the concentration of DAA was
varied. The floatabilities of the PE and PP flakes are roughly similar, whereas that of PET
is much lower. A possible explanation for the behaviour of the PE and PP is the formation
of coating layers. As the concentration of DAA increased up to 0.005 kg/m3, the
hydrophobicity, and consequently the buoyancy, of the PE and PP flakes increased since
the first coating layer was created. As the concentration of DAA-reagent is increased
further, the PE and PP flakes’ floatability decreased. It is assumed that when the reagent
3.1. The effect of the treatment with DAA or PVA wetting reagent on the floatability of
polymers
The aqueous solution was treated with DAA or PVA of concentrations of up to 0.1
kg/m3. The MIBC frother concentration was 0.06 kg/m3 and the pH of the solution was 7.
Fig. 4 shows the floatability of PET, PE and PP as the concentration of DAA was
varied. The floatabilities of the PE and PP flakes are roughly similar, whereas that of PET
is much lower. A possible explanation for the behaviour of the PE and PP is the formation
of coating layers. As the concentration of DAA increased up to 0.005 kg/m3, the
hydrophobicity, and consequently the buoyancy, of the PE and PP flakes increased since
the first coating layer was created. As the concentration of DAA-reagent is increased
further, the PE and PP flakes’ floatability decreased. It is assumed that when the reagent
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