The flotation reagents used in this work were
obtained from Sigma-Aldrich (≥99% purity) and were
used without further purification. Table 1 gives the
properties of the poly(ethylene glycol) alkyl ethers
(CnH2n+1O(C2H4O)mH, CnEm) family including the
numbers of alkyl (n) and ethylene glycol (m) groups,
hydrophilic-lipophilic balance (HLB), relative molecular
mass (M) and critical coalescence concentration (CCC95).