Abstract Kinetics of iron removal from quartz under the ultrasound-assisted leaching was explored in this paper, and the effects of temperature, leaching time, stirring speed and ultrasonic input power on iron removal were studied. The results revealed that the reaction kinetics followed the shrinking core model and the product layer internal diffusion was the rate-determining step in the ultrasound-assisted leaching process. The activation energy of the ultrasonic-assisted leaching reaction was 27.72 kJ/mol, which was 7.28 kJ/mol higher than that of the regular method. Moreover, the kinetic equation and mathematical model of iron removal from quartz were established. Compared with the regular leaching, only 40 min were required for the ultrasound-assisted leaching process to achieve an iron removal rate of up to 74%. Under the optimal parameters, SiO2 content of concentrate increased from 99.5828% to 99.9047%, and Fe2O3 content reduced from 0.0857% to 0.0223%. Additionally, it was found that the iron removal rate increased with increasing temperature, stirring speed or ultrasonic power.

中文翻译：

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超声辅助浸出石英除铁动力学研究

摘要 研究了超声波辅助浸出石英除铁动力学，研究了温度、浸出时间、搅拌速度和超声波输入功率对除铁效果的影响。结果表明，反应动力学遵循收缩核心模型，产物层内部扩散是超声辅助浸出过程中的速率决定步骤。超声辅助浸出反应的活化能为27.72 kJ/mol，比常规方法提高7.28 kJ/mol。建立了石英除铁动力学方程和数学模型。与常规浸出相比，超声辅助浸出过程仅需 40 分钟即可实现高达 74% 的除铁率。在最优参数下，精矿SiO2含量由99.5828%提高到99.9047%，Fe2O3含量从0.0857%降低到0.0223%。此外，还发现除铁率随着温度、搅拌速度或超声功率的增加而增加。