Chalcopyrite (CuFeS₂) is the most abundant copper-bearing mineral in nature. Large amounts of low-grade chalcopyrite ores cannot easily be utilized due to technical and economic limitations, which lead to an enormous waste of resources. Bioleaching is one of the most common methods to treat low-grade copper ores. However, the low leaching efficiency limits the industrial application of bioleaching chalcopyrite. In this study, polyvinyl pyrrolidone (PVP) was used to intensify the bioleaching of chalcopyrite with Acidithiobacillus ferrooxidans. The bioleaching results showed that PVP increased the bioleaching efficiency and the maximal effect was achieved by adding PVP after 6 days of experimental time. The solid leach residues were investigated using X-ray diffraction (XRD), Raman spectroscopy, and X-ray photoelectron spectrometry (XPS) analyses to elucidate the role of PVP. Elemental sulfur and jarosite were detected on the chalcopyrite surface. These compounds may have formed a “passivation” layer, thereby hindering bioleaching as described in the literature. Moreover, PVP inhibited the generation of elemental sulfur and weakened the stability of the “passivation” layer. Additionally, PVP may have improved the surface hydrophilicity of chalcopyrite, which probably lead to an enhanced solid-liquid mass transfer.

黄铜矿 (CuFeS ₂ ) 是自然界中含量最丰富的含铜矿物。大量的低品位黄铜矿矿石受技术和经济的限制，难以利用，造成资源的极大浪费。生物浸出是处理低品位铜矿石的最常用方法之一。然而，低浸出效率限制了生物浸出黄铜矿的工业应用。在本研究中，聚乙烯吡咯烷酮 (PVP) 被用于强化氧化亚铁硫杆菌对黄铜矿的生物浸出. 生物浸出结果表明，PVP 提高了生物浸出效率，并且在实验 6 天后加入 PVP 达到了最大效果。使用 X 射线衍射 (XRD)、拉曼光谱和 X 射线光电子能谱 (XPS) 分析来研究固体浸出残留物，以阐明 PVP 的作用。在黄铜矿表面检测到元素硫和黄钾铁矾。这些化合物可能形成了“钝化”层，从而阻碍了文献中所述的生物浸出。此外，PVP 抑制了元素硫的生成，削弱了“钝化”层的稳定性。此外，PVP 可能改善了黄铜矿的表面亲水性，这可能会导致固液传质增强。