Efficient and cost-effective fluorine recovery from liquid-phase wet-process phosphoric acid via two-step precipitation method

被引：5
作者：
He, Binbin [1 ,2 ]
Zhu, Yuanzhi [1 ,2 ]
Zu, Yun [1 ,2 ]
Nie, Yunxiang [1 ,2 ]
Mei, Yi [1 ,2 ]
机构：
[1] Kunming Univ Sci & Technol, Fac Chem Engn, Kunming 650500, Peoples R China
[2] Yunnan Prov Key Lab Energy Saving Phosphorus Chem, Kunming 650500, Peoples R China
来源：
SEPARATION AND PURIFICATION TECHNOLOGY | 2023年 / 325卷
基金：
中国国家自然科学基金;
关键词：
Wet-process phosphoric acid; Fluorine recovery; Two-step precipitation; Reaction kinetics; Diffusion mechanism; SODIUM FLUOROSILICATE; SOLVENT-EXTRACTION; PURIFICATION; PHOSPHATE; URANIUM;
D O I：
10.1016/j.seppur.2023.124687
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
Fluorine (F) recovery from wet-process phosphoric acid (WPA) is essential for sustainable resource utilization and environmental protection. In this study, we have proposed a two-step precipitation strategy for recovering F from WPA using anhydrous sodium sulfate and activated silica as precipitants. The optimized F recovery yield, product purity, and maximum P2O5 loss were 87.60 %, >98.50 wt%, and 0.030 wt%, respectively. Moreover, the recovery cost was only USD 60.08 per tonne of P2O5. The precipitation reactions followed the second-order reaction model and were controlled by the moving boundary diffusion mechanism. Temperature significantly influenced the reaction process, while temperature, WPA concentration, and Al3+ content significantly influenced the morphology of the precipitated crystal. Under optimized conditions, the sodium fluorosilicate product had a hexagonal cylindrical axis, low solubility in WPA, and high purity. These findings are promising for the utilization of F resources from phosphate rock and other ores, which is of great economic and environmental significance.
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页数：8
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