离子型稀土原地浸矿废弃地中残存稀土分布规律及配分特征

Study on Distribution Law and Distribution Characteristics of Residual Rare Earth in Ion-type Rare Earth In-situ Leaching Wasteland

以定南县某原地浸矿废弃地为研究对象,采集不同空间位置、不同深度的土壤样品,分析了废弃地中残存稀土元素的垂直分布规律及稀土配分特征。研究结果显示,废弃地中残存稀土及其配分在矿体内部的空间变异性及空间分布差异性很大,废弃地的腐殖层和残坡积层稀土元素丰度较高,局部区域浓度达1821.54 mg/kg,全风化层稀土丰度受成土母岩与矿层风化程度共同耦合作用影响。对废弃地稀土配分研究分析,发现浸取后残存稀土配分整体上仍呈现分馏效应,且Ce的配分值较未开采原生矿床出现显著增加。对某采样点样品与原生矿床样品对比分析,发现重稀土配分随着深度的增加,在整体上呈现下降的趋势。

Taking a certain in-situ leaching and abandoned land in Dingnan County,Jiangxi Province,as the research object,the soil samples with different spatial locations and different depths were collected,and the vertical distribution of rare earth elements and the characteristics of rare earth elements in the abandoned land were analyzed.The results show that the spatial variability and spatial distribution of residual rare earth in the abandoned land are very different.The abundances of rare earth elements in the humus layer and residual slope layer of the abandoned land are higher than those in other layers,with the highest concentration of 1821.54 mg/kg.The abundance of rare earth in the fully weathered layer is affected by the coupling between the parent rock and the weathering degree of the ore layer.According to the analyses of the rare earth partitions in the abandoned land,it is found that the residual rare earth components still have a fractionation effect after leaching,and the distribution value of Ce is significantly higher than that of the original deposit.Comparing the samples with the original deposit,it is found that the heavy rare earth component has a decreasing trend with the increase of depth.