ABSTRACT A vertical tubular reactor is used for the oxidative leaching process in the mineral processing industry, especially sphalerite. Oxygen could oxidise ferrous ions (Fe2+), and ferric ions (Fe3+) are generated as the principal oxidation agent in the reactor afterward. The partial pressure of oxygen is an instrumental parameter that could change according to reactor height. Despite the extensive studies on Fe(II) oxidation in the high-pressure reactor, there is no published work on its oxidation behaviour in the tubular reactor. Hence, the Fe3+ ion's oxidation in sulfuric acid solutions was investigated in atmospheric condition. The effects of the FeSO4, H2SO4, ZnSO4 concentration, and pressure in the reactor bottom were studied on the rate of ferrous oxidation at different temperatures, i.e. T = 70, 87 and 95°C. Sulfuric acid drops the kinetic of ferrous oxidation, whereas temperature and pressure of the reactor bottom increase this criterion. The apparent activation energy obtained was 67.22 kJ/mol, and an empirical equation for the oxidation rate of Fe2+ by air is as follows:

中文翻译：

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立式管式反应器中 Fe(II) 氧化动力学：中试规模

摘要 立式管式反应器用于矿物加工业，尤其是闪锌矿的氧化浸出工艺。氧气可以氧化亚铁离子（Fe2+），然后在反应器中生成铁离子（Fe3+）作为主要氧化剂。氧分压是一个仪器参数，可根据反应器高度而变化。尽管对高压反应器中的 Fe(II) 氧化进行了广泛的研究，但没有关于其在管式反应器中的氧化行为的已发表工作。因此，在大气条件下研究了硫酸溶液中 Fe3+ 离子的氧化。研究了反应器底部的 FeSO4、H2SO4、ZnSO4 浓度和压力对不同温度下亚铁氧化速率的影响，即 T = 70、87 和 95°C。硫酸会降低亚铁氧化的动力学，而反应器底部的温度和压力会增加该标准。得到的表观活化能为67.22 kJ/mol，Fe2+被空气氧化的经验公式如下：