摘要
为了研究霓石表面溶出离子Fe~(3+)、Na~+对十二胺体系中镜铁矿和霓石可浮性的影响,以0.044~0.074 mm粒级镜铁矿和霓石单矿物为研究对象,进行单矿物浮选试验,并通过Zeta电位测量和溶液化学计算研究其作用机理。结果表明:十二胺对镜铁矿和霓石均具有较好的捕收作用;Fe~(3+)对镜铁矿的抑制效果强于霓石,Na~+对2种矿物可浮性均无明显影响;加入Fe~(3+)、Na~+均能使镜铁矿和霓石矿物表面电位发生右移,表面电位升高减弱了十二胺在矿物表面的静电吸附;Fe~(3+)主要以亲水性Fe(OH)_3沉淀形式吸附在矿物表面,使矿物亲水性增大,从而对矿物产生抑制作用。
In order to research the effect of Fe~(3+) and Na~+ dissolved from aegirite on the flotation of specularite and aegirite in dodecylamine system,single mineral flotation experiment was carried out with 0.044~0.074 mm size fraction minerals of specularite and aegirite. The mechanism was analyzed from views of Zeta potential measurement and solution chemical calculation. The results showed that dodecylamine had a good effect on the collection of specularite and aegirite,while Fe~(3+) showed a stronger inhibitory effect on specularite than that of aegirite,and Na+had no significant depression effect on the floatability of these two minerals. The added Fe~(3+) and Na~+ right shifted the surface potential of these two minerals,which wakened the electrostatic adsorption of dodecylamine. Fe~(3+) adsorbed on the surface of these two minerals mainly in the form of hydrophilic hydroxide precipitation,which increased the hydrophilicity of specularite and aegirite and inhibited their floatability.
引文
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