摘要
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 Ca^2＋ and Fe^3＋, on the flotation of spodumene and beryl were studied. The results show that Fe^3＋ and Ca^2＋ exhibit efficient activation on the flotation of spodumene and beryl. The activation of Fe^3＋ happens quite well within a pH range of 6-9 while the concentration of Fe^3＋ is 35 mg/L. Efficient activation of Ca^2＋ takes place over at a pH over 11.6 at a concentration of 140 mg/L. The zeta potential of beryl and spodumene shifts slightly to positive values when activated by Ca^2＋, but markedly by Fe^3＋. 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 Fe^3＋ 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 Fe^3＋-activated beryl and spodumene.
基金
Project 2005CB623701 supported by the National Key Basic Research & Development Program (973) of China
