ABSTRACT

To expound the relationship between bioleaching behaviors and mineralogical properties of pristine pyrite samples, chemical compositions, semiconductive properties, surface morphologies, and chemical species of synsedimentary pyrite (SSP) and mesothermal pyrite (MTP) were compared, accompanying with bioleaching behaviors analysis by three thermophiles. Mineralogical characterizations showed that both pyrites belonged to p-type semiconductors with an S/Fe ratio higher than 2, and the arsenic content in MTP was as high as 0.6%. The fractured surface of SSP had more kinks and steps, and higher concentrations of S^2- and oxides, as compared with that of MTP. Bioleaching results indicated that SSP was leached faster than MTP. The more kinked and stepped structures and the larger contents of S^2- and oxides on pyrite surfaces were the dominant reasons for the faster bioleaching kinetics of SSP. The high arsenic content in MTP limiting the cell growth was another cause for its slower leaching.

摘要

为了阐明原始黄铁矿样品的生物浸出行为与矿物学性质之间的关系，比较了同沉积黄铁矿（SSP）和中温黄铁矿（MTP）的化学成分、半导体性质、表面形态和化学种类，并结合三种嗜热菌的生物浸出行为分析. 矿物学表征表明，这两种黄铁矿都属于p型半导体，S/Fe比大于2，MTP中砷含量高达0.6%。SSP的断口处扭结和台阶较多，S ^{2-浓度较高}和氧化物，与 MTP 相比。生物浸出结果表明，SSP 的浸出速度比 MTP 快。更多的扭结和阶梯结构以及黄铁矿表面上更大的S ^2-和氧化物含量是SSP更快的生物浸出动力学的主要原因。MTP 中的高砷含量限制了细胞生长是其浸出速度较慢的另一个原因。