人工磁铁矿和天然磁铁矿在十二胺捕收剂体系中浮选行为及机理研究

Research on Flotation Behavior and Its Mechanism of Artificial and Natural Magnetite with DDA as Collector

对人工磁铁矿和天然磁铁矿在十二胺捕收剂体系中的浮选行为进行了研究,并对其行为机理进行了探讨。浮选试验表明,人工磁铁矿的可浮性比天然磁铁矿差,人工混合矿浮选分离时,人工磁铁矿所需十二胺用量较大。机理研究表明,十二胺与人工磁铁矿和天然磁铁矿均呈物理吸附;与天然磁铁矿相比,人工磁铁矿的多孔状结构使其吸附能力强、吸附密度小、单个矿物颗粒质量较轻,从而导致两者的浮选行为出现差异,其中尤以吸附密度对可浮性影响大;此外,人工磁铁矿吸附能力强是其人工混合矿分离时十二胺用量较大的主要原因。

The flotation behavior and its mechanism of artificial and natural magnetite by using dodecylamine （DDA） as collector were investigated. It is shown from the flotation tests that floatability of artificial magnetite is lower than natural magnetite. Thus a higher dosage of dodecylamine is required for artificial magnetite during the flotation of mixed ore. The investigation of its mechanism showed that dodecylamine is physically adsorbed on the surface of both artificial and natural magnetite. Compared with natural magnetite, artificial magnetite is characterized with strong adsorbability, low adsorption density and lighter single particle weight due to its porous structure, resulting in the difference in floatation behavior between both minerals which is principally influenced by adsorption density. Furthermore, the strong adsorbability of artificial magnetite also principally contributes to the higher dosage of dodecylamine in the separation of mixed ore.