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若能使热氧化了的Nkomati致密块状硫化矿石硫化得以成功,就会恢复氧化了的硫化矿物(其中包括镍黄铁矿)的浮选可浮性。氧化了的镍黄铁矿不容易被硫化。XPS光谱分析未鉴定出在镍黄铁矿表面上有任何硫化表面组分的存在。提出了氧化了的镍黄铁矿的硫化机理:通过硫化物的沉淀或被吸附的铁和铜的氢氧化物转换为硫化物,使氧化了的Nkomati矿石中的铁和铜组分在氧化了的镍黄铁矿表面上形成了硫化物,从而提高了镍黄铁矿的可浮性。为此研究了在镍黄铁矿单矿物硫化过程中贱金属离子的作用。试验发现,在硫化过程中添加铁离子可有效地提高矿物下一步的浮选回收率,并且在硫离子电极电位为-650mV(相对标准氢电极电位为-315mV)时镍黄铁矿的回收率最高。研究结果表明,在氧化了的Nkomati矿石中的镍黄铁矿的硫化过程中,硫化后的镍黄铁矿的浮选速度比镍黄铁矿单矿物的浮选速度要快。铁离子的硫化效果比铜离子的效果要好,这可能是由于矿浆中的铁离子浓度比铜离子浓度高得多。在较低的硫氢根离子浓度下,硫化电位的意义与硫氢根离子的可利用性有关,而在较高的硫化电位下,硫化电位可能与被吸附的贱金属硫氢化物离子的络合有关。建议在硫化过程中添加贱金属离子,以提高难选硫化矿物,如镍黄铁矿的浮选回收率。
Fossil flotation of oxidized sulfide minerals, including pentlandite, can be restored if the successful oxidation of the thermally oxidized Nkomati compact massive sulfide ores results. Oxidized pentlandite is not easily sulfidized. XPS spectral analysis did not identify the presence of any sulfide surface components on the surface of the pentlandite. The mechanism of sulfidation of oxidized pentlandite is proposed: the iron and copper components in the oxidized Nkomati ore are oxidized by the precipitation of sulfides or the adsorption of adsorbed iron and copper hydroxides to sulfides Of the pentlandite formed sulfide on the surface, thereby increasing the flotation of pentlandite. Therefore, the role of base metal ions during the single-mineral sulfation of pentlandite was studied. It was found that the addition of ferric ions during the vulcanization process effectively increased the flotation recovery of the mineral in the next step and that the pentlandite recovery at a sulfide ion potential of -650 mV (vs. the standard hydrogen electrode potential of -315 mV) highest. The results show that during the sulfidation of pentokinite in oxidized Nkomati ore, the sulfided pentokitrite flotation rate is faster than the flotation of pentoketanite single mineral. Iron ionization is more effective than copper ionization, probably due to the much higher iron ion concentration in the slurry than the copper ion concentration. At lower concentrations of hydrogen sulfide ions, the significance of the sulfurization potential is related to the availability of the hydrogen sulfide ions. At higher sulfurization potentials, the potential of the sulfurization potential may be related to the adsorption of the base metal hydride ions Related. It is advisable to add base metal ions during the vulcanization to increase flotation recovery of refractory sulphide minerals, such as pentlandite.