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Effects of multivalent metallic cations, such as Ca2+ and Fe3+, on the flotation of spodumene and beryl were studied. The results show that Fe3+ and Ca2+ exhibit efficient activation on the flotation of spodumene and beryl. The ac- tivation of Fe3+ happens quite well within a pH range of 6-9 while the concentration of Fe3+ is 35 mg/L. Efficient acti- vation of Ca2+ takes place over at a pH over 11.6 at a concentration of 140 mg/L. The zeta potential of beryl and spo- dumene shifts slightly to positive values when activated by Ca2+, but markedly by Fe3+. New stretching frequencies of 1594.24 cm-1 and 1587.13 cm-1 have been found in the FTIR spectra of the two minerals after their interaction with Fe3+ and the collector. These new stretching frequencies are the asymmetric stretching frequencies of COO-(carboxyl anion), so thecollector may be chemically absorbed on the surface of Fe3+-activated beryl and spodumene.
Effects of multivalent metallic cations, such as Ca2 + and Fe3 +, on the flotation of spodumene and beryl were studied. The results show that Fe3 + and Ca2 + exhibit excellent activation on the flotation of spodumene and beryl. The ac- tivation of Fe3 + happens quite well within a pH range of 6-9 while the concentration of Fe3 + is 35 mg / L. Efficient acti- vation of Ca2 + takes place over at pH-11.6 at a concentration of 140 mg / L. The zeta potential of beryl and spo- dumene shifts slightly to positive values when activated by Ca2 + but markedly by Fe3 +. New stretching frequencies of 1594.24 cm-1 and 1587.13 cm-1 have been found in the FTIR spectra of the two minerals after their interaction with Fe3 + and the collector. These new stretching frequencies are the asymmetric stretching frequencies of COO- (carboxyl anion), so the collector may be chemically absorbed on the surface of Fe3 + -activated beryl and spodumene.