金属离子对十二烷基磺酸钠浮选蓝晶石的影响

通过单矿物浮选试验，考察了Na+、K+、Ca²⁺、Mg²⁺、Fe³⁺、Al³⁺这6种金属离子在酸性条件下对十二烷基磺酸钠（SDS）浮选蓝晶石的影响，结果表明：一价离子Na+、K+对蓝晶石的浮选基本没有影响；二价离子Ca2+、Mg2+对蓝晶石的浮选有抑制作用，且Ca2+的抑制能力更强；三价离子Fe³⁺、Al³⁺对蓝晶石的浮选有活化作用，且Al3+的活化能力更强。以Ca²⁺和Fe³⁺分别为二价离子和三价离子的代表，通过溶液化学分析了它们的抑制机理和活化机理，结果表明：钙离子在酸性介质中的主要水解组分为Ca²⁺，Ca²⁺易与SDS中的磺酸基形成难溶物，从而使SDS被消耗大量而产生抑制作用；铁离子在酸性条件下对蓝晶石起活化作用的有效水解组分因pH值不同而变化，pH<2.5时FeOH²⁺和Fe(OH)₂⁺是起活化作用的有效水解组分，pH≥2.5时Fe(OH)_3(s)是起活化作用的有效水解组分。

Effects of Metal Ions on Flotation of Kyanite with Sodium Dodecyl Sulfate

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.