Article(id=1236330607706435964, tenantId=1146029695717560320, journalId=1235980550691926019, issueId=1236330603000418795, articleNumber=null, orderNo=null, doi=10.3969/j.issn.0253-6099.2023.04.023, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1675612800000, receivedDateStr=2023-02-06, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1772693786788, onlineDateStr=2026-03-05, pubDate=1690819200000, pubDateStr=2023-08-01, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1772693786788, onlineIssueDateStr=2026-03-05, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1772693786788, creator=13701087609, updateTime=1772693786788, updator=13701087609, issue=Issue{id=1236330603000418795, tenantId=1146029695717560320, journalId=1235980550691926019, year='2023', volume='43', issue='4', pageStart='1', pageEnd='189', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1772693785667, creator=13701087609, updateTime=1772696855253, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1236343477835985022, tenantId=1146029695717560320, journalId=1235980550691926019, issueId=1236330603000418795, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1236343477835985023, tenantId=1146029695717560320, journalId=1235980550691926019, issueId=1236330603000418795, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=103, endPage=109, ext={EN=ArticleExt(id=1236330608033591699, articleId=1236330607706435964, tenantId=1146029695717560320, journalId=1235980550691926019, language=EN, title=Distribution of Residual Leaching Agent and Main Co-existing Ions in Weathered Crust Elution Deposited Rare Earth Tailings, columnId=1236276106727321817, journalTitle=Mining and Metallurgical Engineering, columnName=METALLURGY, runingTitle=null, highlight=null, articleAbstract=

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 Al³⁺ and RE³⁺ in the surface layer; while as for the ore body at deeper position, the content of co-existing cations Al³⁺ and RE³⁺ decreases obviously, and the co-existing anions SO₄^2- and Cl^- present an opposite variation trend.

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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Al³⁺和RE³⁺在表层含量最高；随着矿体深度增加，阳离子Al³⁺和RE³⁺含量明显降低，共存阴离子SO₄^2-、Cl^-含量则呈相反变化趋势。

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李小菊（1988—），女，甘肃天水人，博士研究生，讲师，主要研究方向为矿山环境修复。

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李小菊（1988—），女，甘肃天水人，博士研究生，讲师，主要研究方向为矿山环境修复。

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