风化壳淋积型稀土尾矿中残留浸矿剂及主要共存离子分布规律研究  

Distribution of Residual Leaching Agent and Main Co⁃existing Ions in Weathered Crust Elution Deposited Rare Earth Tailings

作　　者：李小菊 余军霞 汪荣 欧阳泽 刘洋 胡庆梓 陈施宇 周芳 池汝安 LI Xiaoju;YU Junxia;WANG Rong;OUYANG Ze;LIU Yang;HU Qingzi;CHEN Shiyu;ZHOU Fang;CHI Ru′an(School of Chemical and Environmental Engineering,Wuhan Institute of Technology,Wuhan 430200,Hubei,China;Xingfa Mining College,Wuhan Institute of Technology,Wuhan 430000,Hubei,China)

机构地区：[1]武汉工程大学化学与环境工程学院,湖北武汉430200 [2]武汉工程大学兴发矿业学院,湖北武汉430000

出　　处：《矿冶工程》2023年第4期103-109,共7页Mining and Metallurgical Engineering

基　　金：国家自然科学基金面上项目(52274267);国家重点研发计划项目(2018YFC1801801)。

摘　　要：以风化壳淋积型稀土矿采用硫酸铵原地浸出后的闭矿场尾矿为研究对象,研究了尾矿样品的含水率、pH值、Zeta电位随采样深度的变化趋势,分析了总氮、硝态氮、铵态氮和主要共存离子在矿体中的含量及分布。结果表明,稀土尾矿样品均呈酸性,其含水率和Zeta电位均随采样深度增加而逐渐降低。残留铵盐主要以铵态氮中的水溶态铵(11%~33%)和离子交换态铵(59%~87%)赋存在矿体中,并且其在中层矿体中的含量最高、表层矿体中的含量最低。XRD分析结果表明,尾矿中黏土矿物含量与残留铵含量呈正相关。因表层矿体中有机质含量高,共存阳离子Al^(3+)和RE^(3+)在表层含量最高;随着矿体深度增加,阳离子Al^(3+)和RE^(3+)含量明显降低,共存阴离子SO_(4)^(2-)、Cl^(-)含量则呈相反变化趋势。After an in⁃situ leaching of weathered crust elution⁃deposited rare earth ores with ammonium sulfate,the obtained tailings were taken to explore the variation of water content,pH value,Zeta potential with sampling depth,and then the total nitrogen content,nitric nitrogen,ammonium nitrogen and the main co⁃existing ions were also analyzed.The results indicate that the tailings samples were all acidic,and both water content and Zeta potential decreased with increasing of sampling depth.The residual ammonium salt in the ore body mainly exists in the form of water⁃soluble ammonium(11%-33%),and ion⁃exchange ammonium(59%-87%)in ammonium nitrogen,presenting the highest content in middle layer and the lowest content in surface layer.XRD analysis reveals that the content of clay minerals in the rare earth tailings positively correlated with the content of residual ammonium.In addition,high content of organic matter in the surface layer of the ore body leads to the highest content of co⁃existing cations Al 3+and RE 3+in the surface layer;while as for the ore body at deeper position,the content of co⁃existing cations Al^(3+)and RE^(3+)decreases obviously,and the co⁃existing anions SO_(4)^(2-)and Cl^(-)present an opposite variation trend.

关 键 词：浸矿剂 氨氮去除 硫酸铵 原地浸出 稀土 稀土尾矿 残留铵盐 离子分布规律 环境污染 

分 类 号：TQ09[化学工程]