磷石膏
浸出(土壤学)
钇
化学
金属
盐酸
氧化物
浸出剂
铅冶炼
矿物学
无机化学
冶炼
硫酸
地质学
土壤水分
原材料
有机化学
土壤科学
作者
Qingjun Guan,Ying Sui,Chufeng Liu,Yongjie Wang,Chuxiong Zeng,Weijian Yu,Zhiyong Gao,Zhenyue Zang,Ruan Chi
出处
期刊:Minerals
[Multidisciplinary Digital Publishing Institute]
日期:2022-05-31
卷期号:12 (6): 703-703
被引量:17
摘要
The characterization and leaching mechanism of REEs from phosphogypsum (PG) in HCl was studied in-depth. REEs contained in the PG were 208 ppm, of which Y, La, Ce, and Nd were the four most abundant elements. The modes of occurrence of rare earth elements (REEs) in the PG were quantified using the sequential chemical extraction (SCE) method. Among the five REE occurrence species, the metal oxide form accounted for the largest proportion, followed by the residual, organic matter, and ion-exchangeable fractions, and REEs bound to carbonates were the least. From the comparison of the distributions of REEs and calcium in different occurrence states, it can be determined that REEs contained in the PG were mainly present in the residue state (existed in the gypsum lattice) and the metal oxide state (easily leached). The leaching results show that the suitable leaching conditions were acid concentration of 1.65 mol/L, S/L ratio of 1/10, and reaction temperature of 60 °C. At the condition, the maximum leaching efficiency for ∑REE was 65.6%, of which the yttrium leaching rate was the highest and reached 73.8%. Importantly, A new kinetic equation based on the cylindrical shrinking core model (SCM) was deduced and could well describe REE leaching process from PG. The apparent activation energy for ∑REE leaching was determined to be 20.65 kJ·mol−1.
科研通智能强力驱动
Strongly Powered by AbleSci AI