This work aims to establish the quantitative relationship between the surface oxidation state of pyrite and flotation performance. In this paper, an efficient method was proposed to prepare pyrite with different oxidation degrees. Flotation tests show that the floatability of pyrite decreased with prolonging the oxidation time. Tof-SIMS results reveal that the main component on the oxidized pyrite surface is Fe hydroxides or oxides. XPS analysis confirms that Fe(OH)₂ and FeOOH are the main formula of Fe species, and the ratio of Fe²⁺/Total Fe agrees well with the floatability of pyrite with different oxidation degrees, which can be taken as an index to develop the flotation performance of pyrite. DFT simulation calculation further demonstrates the reliability of Fe(OH)₂ as the active site. This study provides essential surface chemistry evidence for correlating the surface species with the floatability of pyrite with different oxidation states through quantitative analysis of various intermediate products.

本工作旨在建立黄铁矿表面氧化态与浮选性能之间的定量关系。本文提出了一种制备不同氧化程度黄铁矿的有效方法。浮选试验表明，黄铁矿的可浮性随着氧化时间的延长而降低。Tof-SIMS 结果表明，氧化黄铁矿表面的主要成分是 Fe 氢氧化物或氧化物。XPS分析证实Fe(OH) ₂和FeOOH是Fe物种的主要分子式，Fe ²⁺ /Total Fe之比与不同氧化程度黄铁矿的可浮性吻合较好，可作为发展指标黄铁矿的浮选性能。DFT模拟计算进一步证明了Fe(OH) _{2的可靠性}作为活动站点。本研究通过对各种中间产物的定量分析，为将表面物质与具有不同氧化态的黄铁矿的可浮性相关联提供了必要的表面化学证据。