Data from: Mechanism of Ca2+, Mg2+ and Fe3+ in fine cassiterite flotation using octanohydroxamic acid

The existence of metal ion should not be ignored in both hydrometallurgy and flotation. In this study, the effects of Ca2+, Mg2+ and Fe3+ on the flotation performance of cassiterite using octanohydroxamic acid (OHA) as the collector were investigated by the micro-flotation tests, X-ray photoelectron spectroscopy (XPS), fourier transform infrared spectroscopy (FTIR), contact angle, zeta (ζ) potential measurements and atomic force microscopy (AFM) imaging. The results of the flotation and contact angle experiments showed that the addition of Ca2+, Mg2+ and Fe3+ significantly decreased both the recovery and contact angle of cassiterite within pH ranged from 6.0 to 12.0 in the presence of OHA collector. ζ–potential measurements, solution chemistry analysis and FTIR measurements indicated that the flotation recovery of the cassiterite declined due to the CaOH+, MgOH+ and Fe(OH)3 sites on the cassiterite surface. XPS results indicated that the chemisorption of OHA on cassiterite surface and its adsorption combined with calcium ions effects finally changed the chemical properties of cassiterite surface. The AFM images also revealed that new species Fe(OH)3 of Fe3+ formed and adsorbed on the cassiterite surface at pH of 9.0. The adsorption of Fe(OH)3 reduced the adsorption of OHA on the cassiterite surface, thus the hydrophobicity of cassiterite was deteriorated.

湿法冶金与浮选中，金属离子的影响均不容忽视。本研究采用微浮选实验、X射线光电子能谱（X-ray photoelectron spectroscopy, XPS）、傅里叶变换红外光谱（fourier transform infrared spectroscopy, FTIR）、接触角测量、ζ电位（zeta (ζ) potential）测试以及原子力显微镜（atomic force microscopy, AFM）成像等手段，探究了Ca²+、Mg²+、Fe³+对以辛基异羟肟酸（octanohydroxamic acid, OHA）为捕收剂的锡石浮选性能的影响。浮选与接触角实验结果表明，在OHA捕收剂存在下，当pH值处于6.0~12.0区间时，Ca²+、Mg²+、Fe³+的添加会显著降低锡石的浮选回收率与接触角。ζ电位测试、溶液化学分析与FTIR测试结果显示，锡石浮选回收率下降的原因在于其表面形成的CaOH+、MgOH+及Fe(OH)3吸附位点。XPS结果表明，OHA在锡石表面的化学吸附，以及其与钙离子的协同作用，最终改变了锡石表面的化学性质。AFM成像结果还显示，在pH=9.0时，Fe³+会生成Fe(OH)3新物种并吸附于锡石表面。Fe(OH)3的吸附会抑制OHA在锡石表面的吸附，进而劣化锡石表面疏水性。