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采用油酸钠作捕收剂对萤石、菱镁矿和赤铁矿所进行的浮选试验确认了取得良好浮选结果的酸性和碱性范围。酸性介质中的浮选结果与调浆时间的相关性很强,延长调浆时间可使浮选效果得到很大的改善,而碱性介质的浮选试验未表现出与调浆之间有明显相关性。所观察到的这种调节的效应进一步证实了弱电解质型表面活性剂(如脂肪酸)的酸性溶液中胶体物质的作用。油酸钠在酸性pH范围的浮选特性取决于沉淀油酸的特性,此类胶体物质向矿物表面的缓慢扩散控制着浮选的动态特性。另一方面,在碱性介质中捕收剂以离子形式出现,吸附平衡可迅速建立。在此条件下的浮选效果与调浆时间几乎没有什么相关性。这类浮选系统的重要特点之一是,浮选回收率-pH曲线中的最大值与调浆相关。调浆时间增加,最大值则向更强酸性的pH值移动。
Flotation tests of fluorite, magnesite and hematite using sodium oleate as a collector confirmed the acidic and basic ranges for good flotation results. The flotation results in acid medium have strong correlation with the mixing time, and the flotation effect can be greatly improved by prolonging the mixing time, whereas the flotation test in alkaline medium did not show obvious contrast with mixing time Correlation. The observed effect of this modulation further confirms the effect of colloidal substances in acidic solutions of weak electrolyte type surfactants (such as fatty acids). The flotation behavior of sodium oleate in the acidic pH range depends on the nature of the precipitated oleic acid. The slow diffusion of such colloids to the mineral surface controls the dynamics of flotation. On the other hand, collectors appear in ionic form in alkaline media and adsorption equilibrium can be quickly established. In this condition, the flotation effect and slurry time almost no relevance. One of the important features of this type of flotation system is that the flotation recovery-the maximum in the pH curve is related to slurrying. Mixing time increases, the maximum is to move to a more acidic pH.