Abstract A significant proportion of invisible gold is hosted by pyrite and the successful recovery of this gold requires a high recovery of pyrite in flotation. In the industry, the flotation of gold-bearing pyrite is operated in a broad range of pH and collector concentration with different types of grinding media. Following the previous study at pH 5.0 and 7.0, the current study investigated the interaction of grinding media with collector and its effect on pyrite flotation at pH 8.5. It was interesting to find that at the same xanthate dosage the highest pyrite flotation was achieved when forged steel, instead of 30% chrome steel, was used as the grinding media although it produced the highest quantity of iron contamination. Pulp chemistry measurement, surface analysis and electrochemical study revealed that pyrite oxidation prevailed over xanthate oxidation at pH 8.5 and pulp potential played a dominant role in pyrite flotation. At this pH, the high pulp potential generated by high chrome steel grinding media facilitated pyrite oxidation instead of xanthate oxidation, but the low pulp potential generated by forged steel grinding media still allowed xanthate oxidation, thus promoting pyrite flotation.

中文翻译：

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碱性pH条件下黄铁矿浮选研磨介质与捕收剂的相互作用

摘要 很大比例的隐形金以黄铁矿为主体，成功回收这种金需要在浮选中回收高回收率的黄铁矿。在工业中，含金黄铁矿的浮选在广泛的 pH 值和捕收剂浓度范围内使用不同类型的研磨介质进行操作。继先前在 pH 5.0 和 7.0 下的研究之后，当前的研究调查了研磨介质与捕收剂的相互作用及其在 pH 8.5 下对黄铁矿浮选的影响。有趣的是，在相同的黄药剂量下，当使用锻钢而不是 30% 铬钢作为研磨介质时，黄铁矿浮选率最高，尽管它产生的铁污染量最高。纸浆化学测量，表面分析和电化学研究表明，在 pH 8.5 时，黄铁矿氧化优于黄药氧化，矿浆电位在黄铁矿浮选中起主导作用。在此 pH 值下，高铬钢研磨介质产生的高矿浆电位促进了黄铁矿氧化而不是黄药氧化，但锻钢研磨介质产生的低矿浆电位仍然允许黄药氧化，从而促进黄铁矿浮选。