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Leaching behaviour of low and high Fe-substituted chlorite clay minerals at low pH

机译：低pH和高Fe取代的亚氯酸盐粘土矿物的浸出行为

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摘要

The behaviour of low-Fe and high-Fe substituted chlorite mineral dispersions was investigated under industrially-relevant, atmospheric leaching conditions typical of low grade, uranium-bearing lateritic ore processing. The main focus was on the influential role played by the clay mineral chemistry. Preferential leaching of Al(III), Fe(II/III) and Mg(II) metal ions over tetrahedral Si species was indicated at pH 1 and 70 °C by supernatant speciation, the kinetics of which was faster at high-Fe than at low-Fe substitution. For the low-Fe chlorite, the incongruent leaching behaviour of Al(III), Fe(II/III) and Mg(II) species was substantially similar. In the case of the high-Fe chlorite however, despite its lower Mg(II) content, Al(IIl) and Fe(II/III) species leaching rates were relatively lower than that of Mg(II). Crystallo-chemical (XRD, XRF and EM) and spectroscopic (FT1R and XPS) analyses indicated that the incongruent leaching led to significant bulk particle and interfacial layer structures' modification, impacting dramatically upon pulp chemistry, mineralogy and particle interactions.
机译：在具有工业相关性的，低品位，含铀红土矿石加工的典型大气浸出条件下，研究了低铁和高铁取代的亚氯酸盐矿物分散体的行为。主要重点是粘土矿物化学的影响作用。通过上清液的形成表明，在pH 1和70°C下，四面体Si物种优先浸出Al（III），Fe（II / III）和Mg（II）金属离子，其动力学在高铁时比在高铁时更快。低铁替代。对于低铁亚氯酸盐，Al（III），Fe（II / III）和Mg（II）物种的浸出行为不一致。然而，在高铁亚氯酸盐的情况下，尽管其Mg（II）含量较低，但Al（IIl）和Fe（II / III）的浸出率却相对低于Mg（II）。晶体化学（XRD，XRF和EM）和光谱（FT1R和XPS）分析表明，不均匀的浸出会导致大量的本体颗粒和界面层结构发生改性，从而对纸浆化学，矿物学和颗粒相互作用产生重大影响。

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