Redox potential control during flotation of a sulphide mineral ore
Redox potential control during flotation of a sulphide mineral ore
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DOI：
10.1016/j.mineng.2017.04.011
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发表时间：
2017-08-15
影响因子：
4.8
通讯作者：
O'Connor, C. T.
中科院分区：
文献类型：
--
作者：
Chimonyo, W.;Corin, K. C.;O'Connor, C. T.
氧化还原电位（Eh）控制可以通过影响矿物表面的反应从而影响浮选行为而在硫化矿物浮选过程中发挥关键作用。这种控制通常是溶解氧和pH控制的组合功能，但也可以通过使用适当的化学改性剂来实现。进行使用次氯酸钠（NaClO）作为氧化剂的分批浮选试验以研究其作为改变典型Merensky PGM矿石的矿浆中的氧化还原电位的替代手段的效果。pH从天然矿石pH 9-11的变化将Eh从平均值140 mV降低到0 - 100 mV之间的值，并导致回收的固体量减少。另一方面，在恒定pH下增加Eh导致固体和水回收率的显着增加。据观察，对于铜，在本研究中研究的所有条件下，回收率均无显著变化。最终，该研究表明，使用NaClO来改变Merensky矿石浮选中的氧化还原电位对回收率没有任何影响，但确实导致固体和水的回收率显著增加。
Redox potential (Eh) control can play a critical role during sulphide mineral flotation by influencing the reactions on the surface of the minerals and consequently the flotation behaviour. Such control is usually a combined function of dissolved oxygen and pH control but can also be achieved by using appropriate chemical modifiers. Batch flotation tests using sodium hypochlorite (NaCIO) as an oxidant were conducted to investigate its effect as an alternative means of varying redox potential in the pulp of a typical Merensky PGM ore. A change of pH from the natural ore pH of 9-11 lowered the Eh from an average value of 140 mV to values between 0 and 100 mV and resulted in a decrease in the amount of solids recovered. On the other hand increasing the Eh at constant pH resulted in a significant increase in solids and water recovery. It was observed that for copper there was no significant change in recovery for all the conditions investigated in this study. Ultimately this study has shown that using NaCIO to vary the redox potential in the flotation of a Merensky ore did not have any effect on recoveries but did result in a significant increase in the recoveries of solids and water.