Zhao Hang, Zhang Xiaoguang, Chen Mengjun, Shu Jiancheng, Mu Panpan, Yang Feihua, Yan Haile, Pan De'an
College of Materials Science and Engineering, Beijing University of Technology, No. 100, Pingleyuan Street, Chaoyang District, Beijing 100124, P.R. China.
Solid Waste Reuse for Building Materials State Key Laboratory, Beijing Building Materials Academy of Science Research, Beijing 100038, P.R. China.
ACS Omega. 2025 May 8;10(19):19912-19921. doi: 10.1021/acsomega.5c01584. eCollection 2025 May 20.
This work proposes a novel and direct alkaline leaching process for extracting and recovering fluorine from fluorine slag, designed to overcome the current limitations in research on fluorine slag and the unclear leaching mechanisms. 80.40% of fluorine can be leached from the fluorine slag to the solution under optimal leaching conditions (NaOH 3.0 mol/L, temperature 80 °C, time 2 h, liquid-to-solid ratio 18 mL/g, and speed 800 r/min). The leaching kinetics of fluorine from fluorine slag in a concentrated NaOH solution was analyzed using multiple models, and key kinetic parameters, including activation energy and reaction order, were determined. The factors limiting fluorine leaching were identified through density functional theory calculations. Additionally, the economic feasibility of the process was evaluated, providing important insights into its potential for industrial application. This research aims to establish a foundation for optimizing processes and conducting mechanistic studies on the recovery of fluorine resources by leaching fluorine slag.
本研究提出了一种从氟渣中提取和回收氟的新型直接碱性浸出工艺，旨在克服目前氟渣研究的局限性以及浸出机理不明确的问题。在最佳浸出条件（氢氧化钠3.0摩尔/升、温度80℃、时间2小时、液固比18毫升/克、转速800转/分钟）下，80.40%的氟可从氟渣中浸出至溶液中。采用多种模型分析了氟渣在浓氢氧化钠溶液中氟的浸出动力学，并确定了包括活化能和反应级数在内的关键动力学参数。通过密度泛函理论计算确定了限制氟浸出的因素。此外，还评估了该工艺的经济可行性，为其工业应用潜力提供了重要见解。本研究旨在为优化工艺以及对通过浸出氟渣回收氟资源进行机理研究奠定基础。
