Mg2+对油酸钠捕收石英的活化机理研究

石英矿物中常伴生有Mg²⁺，为了解Mg²⁺对油酸钠浮选石英的影响，进行了石英纯矿物浮选试验，并采用Zeta电位测试、溶液化学计算和红外光谱分析方法对Mg²⁺活化石英的机理进行了研究。结果表明：①在没有Mg²⁺存在的情况下，油酸钠对石英没有捕收能力；当矿浆pH=10.5，Mg²⁺浓度为3.75×10^-4 mol/L，油酸钠浓度为6.25×10^-4 mol/L时，石英的浮选回收率可达92.40％。②Zeta电位分析表明，吸附在石英表面的Mg2+是油酸钠吸附的活性位点，因而Mg²⁺对油酸钠浮选石英有活化作用。③溶液化学分析表明，Mg²⁺活化石英的有效成分为MgOH⁺。④红外光谱分析表明，有Mg²⁺存在的情况下，油酸钠才能吸附到石英颗粒表面。

Activation Mechanism of Magnesium Ions to Sodium Oleate Capture Quartz

Magnesium ions are often associated with quartz minerals. In order to research the effect of magnesium ion on the quartz flotation by sodium oleate， the flotation tests of pure quartz minerals were carried out. The mechanism of magnesium ion activating quartz was studied by Zeta potential test， solution chemistry calculation and infrared spectroscopy analysis. The results showed that: ①sodium oleate can not float quartzwithout magnesium ion； The flotation recovery rate of quartz can reach 92.40% under the condition that the pulp pH=10.5， the concentration of magnesium ion is 3.75×10^-4 mol/L， and the concentration of sodium oleate is 6.25×10^-4 mol/L. ②Zeta potential analysis shows that magnesium ion adsorbed on the surface of quartz is the active site of sodium oleate adsorption， so magnesium ion has an activation effect on sodium oleate flotation of quartz. ③Solution chemical analysis showed that the main active composion in the process of magnesium ion activation of quartz was MgOH⁺. ④Infrared spectroscopy analysis showed that sodium oleate can adsorb to the surface of quartz particles with the help of magnesium ion.