岩矿测试2026，Vol.45Issue(2)：382-396,15.DOI:10.15898/j.ykcs.202501020002
稀土元素赋存形态对风化壳淋积型稀土矿提取率的影响
Influence of Rare Earth Occurrence States on Extraction Rate in Weathered Crust Elution-Deposited Rare Earth Ores
摘要
Abstract
The occurrence of rare earth elements(REEs)in weathered crust elution-deposited rare earth ore is very complicated,and only the exchangeable adsorption state REEs can be utilized by the current extraction process,demonstrating that the REE resources have not been effectively utilized.Two samples from weathered crust elution rare earth ore in southern China were selected.Total REE contents in samples were analyzed by mixed acid digestion-inductively coupled plasma-mass spectrometry(ICP-MS),occurrence states of REEs were analyzed by ammonium sulfate leaching and sequential extraction,and the relationship between ammonium sulfate leaching rates and REE occurrence states was preliminarily discussed.The results were as follows in three aspects:(1)Grinding altered the occurrence state of REEs;the ammonium sulfate leaching rates of REEs in the two samples after grinding decreased by 21.5%and 51.6%,respectively.The ion-exchange REEs in the samples decreased significantly,while the carbonate-bound state increased significantly.The iron-manganese oxide-bound state and humic acid-bound state increased slightly.(2)The occurrence states of cerium(Ce)exhibit special enrichment-depletion characteristics,mainly existing in iron-manganese oxide-bound and residual states.Its enrichment order is significantly different from that of other REEs,which also leads to differences in the ammonium sulfate leaching rate of Ce and the changes in its occurrence state before and after grinding compared with other REEs.(3)The leaching rate of REEs other than Ce is positively correlated with the sum content of the ion-exchange state and iron-manganese oxide-bound state,and negatively correlated with the sum content of the carbonate-bound state and residual state.The ion-exchange state and iron-manganese oxide-bound state REEs are important sources for exchangeable adsorption of REEs.The carbonate bound state and residual state do not contribute to the exchangeable adsorption of REEs,and extraction methods other than ion exchange should be considered.This study provides technical support for establishing evaluation standards for weathered crust elution-deposited rare earth ores and improving the utilization rate of rare earth resources.The BRIEF REPORT is available for this paper at http://www.ykcs.ac.cn/en/article/doi/10.15898/j.ykcs.202501020002.关键词
风化壳淋积型稀土矿/稀土赋存状态/混合酸消解/硫酸铵浸取/顺序提取Key words
weathered crust elution-deposited rare earth/occurrence states of rare earth elements/mixed acid digestion/ammonium sulfate leaching/sequential extraction分类
化学化工引用本文复制引用
朱云,张磊,芦苒,郭琳,于汀汀,施意华,马生凤..稀土元素赋存形态对风化壳淋积型稀土矿提取率的影响[J].岩矿测试,2026,45(2):382-396,15.基金项目
广东省地质勘查与城市地质专项项目(2023-1) （2023-1）
国家重点研发计划项目专题(2021YFC2903001) （2021YFC2903001）
