Abstract: Through single mineral flotation test,the effects of Na+,K+,Ca²⁺,Mg²⁺,Fe³⁺,Al³⁺ six metal ions on flotation system of kyanite-sodium dodecyl sulfate (SDS) were studied.The results showed that monovalent ions Na+,K+ have no effect on flotation behavior of kyanite-SDS; Divalent ions C^a2+,Mg²⁺ exhibit inhibition effects on flotation of kyanite-SDS,and Ca²⁺ has more intensity; Trivalent ions Fe³⁺,Al³⁺ exhibit activation on flotation of kyanite-SDS,and Al³⁺ owns more activating ability.The mechanism of inhibition and activation of divalent ions (representative by Ca²⁺) and trivalent ions (representative by Fe³⁺) is analyzed by solution chemistry.The results showed that in the acidic medium the main component of calcium ion is Ca²⁺,which is easy to form the insoluble matter together with the sulfonic acid group of SDS,consuming large amounts of pharmacy and exhibiting inhibition.Iron ion has the different active ingredients on playing the role of activation in kyanite-SDS system at different pH.When pH<2.5,FeOH²⁺ and Fe(OH)₂⁺ were the effective components on playing the role of activation,when pH≥2.5,Fe(OH)_3(s) was the effective component on playing the role of activation.

Key words: Metal ions, Kyanite, Sodium dodecyl sulfate, Flotation, Solution chemistry