ABSTRACT The oxygen pressure leaching of sphalerite in sulphuric acid solutions is a slow process in the absence of iron because of the limitations of the oxygen delivery carrier (redox couple: Fe3+/Fe2+). Herein, the artificial sphalerite with 25.70%, 15.20%, 5.75% iron contents and non-iron was prepared via the sintering of ZnS and FeS and used in the kinetic oxygen pressure leaching experiment. The results indicated that the zinc leaching rate of non-iron sphalerite was significantly lower than those of sphalerite with 25.70%, 15.20%, and 5.75% iron contents. This ratio decreased from 90 to 98% to approximately 65% at a temperature of 403 K, sulphuric acid concentration of 110 g L−1, oxygen partial pressure of 0.8 MPa, and leaching time of 70 min. Furthermore, when compared to the artificial sphalerite with 25.70%, 15.20%, 5.75% iron contents, the activation energy decreased from 32.31 kJ mol−1 for non-iron sphalerite to 29.02, 26.30, and 21.60 kJ mol−1, respectively. The leaching reaction process followed a shrinking unreacted core model that gradually shifted from surface reaction control to diffusion control. The orders of reaction for the sulphuric acid concentration and oxygen partial pressure were also obtained. Finally, artificial sphalerite leaching kinetics model equations with different iron contents were established.

中文翻译：

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氧压浸出不同含铁量人造闪锌矿中锌溶出动力学模型

摘要 由于氧输送载体（氧化还原对：Fe3+/Fe2+）的限制，在没有铁的情况下，硫酸溶液中闪锌矿的氧压浸出是一个缓慢的过程。在此，通过硫化锌和硫化铁的烧结制备了含铁量分别为 25.70%、15.20%、5.75% 和非铁的人造闪锌矿，并用于动态氧压浸出实验。结果表明，非铁闪锌矿的锌浸出率明显低于含铁量为25.70%、15.20%和5.75%的闪锌矿。在 403 K 的温度、110 g L-1 的硫酸浓度、0.8 MPa 的氧分压和 70 分钟的浸出时间下，该比率从 90% 到 98% 下降到大约 65%。此外，与含铁量分别为 25.70%、15.20%、5.75% 的人造闪锌矿相比，活化能从非铁闪锌矿的 32.31 kJ mol-1 分别降低到 29.02、26.30 和 21.60 kJ mol-1。浸出反应过程遵循收缩未反应核心模型，逐渐从表面反应控制转向扩散控制。还得到了硫酸浓度和氧分压的反应顺序。最后，建立了不同铁含量下人工闪锌矿浸出动力学模型方程。还得到了硫酸浓度和氧分压的反应顺序。最后，建立了不同铁含量下人工闪锌矿浸出动力学模型方程。还得到了硫酸浓度和氧分压的反应顺序。最后，建立了不同铁含量下人工闪锌矿浸出动力学模型方程。