Article(id=1321866394237514208, tenantId=1146029695717560320, journalId=1225396423026438145, issueId=1321866297609146910, articleNumber=null, orderNo=null, doi=null, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1746460800000, receivedDateStr=2025-05-06, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1793087107475, onlineDateStr=2026-10-27, pubDate=1779638400000, pubDateStr=2026-05-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1793087107475, onlineIssueDateStr=2026-10-27, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1793087107475, creator=13701087609, updateTime=1793087107475, updator=13701087609, issue=Issue{id=1321866297609146910, tenantId=1146029695717560320, journalId=1225396423026438145, year='2026', volume='46', issue='5', pageStart='1', pageEnd='312', issueExtLink='null', onlineDate='null', pubDate='1779638400000', pubDateStr='2026-05-25', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1793087084438, creator='13701087609', updateTime=1793094562481, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1321897662853533805, tenantId=1146029695717560320, journalId=1225396423026438145, issueId=1321866297609146910, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1321897662853533806, tenantId=1146029695717560320, journalId=1225396423026438145, issueId=1321866297609146910, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=242, endPage=250, ext={EN=ArticleExt(id=1321866394967323105, articleId=1321866394237514208, tenantId=1146029695717560320, journalId=1225396423026438145, language=EN, title=Experimental and Mechanism Research on Ionic Rare Earth Extraction Using Ammonia-Free High-Activity Magnesium Oxide Precipitation, columnId=null, journalTitle=Mining Research and Development, columnName=null, runingTitle=null, highlight=null, articleAbstract=

The precipitation extraction process of rare earths from ionic rare earth ore by ammonium salt leads to eutrophication of receiving water bodies and disruption of aquatic ecological balance. It also triggers cascading ecological issues such as soil acidification and compaction in surrounding areas, as well as threats to human health. To address this ammonia nitrogen pollution problem, the leachate from an ionic rare earth mine in Longnan was taken as the research object. A light-burned, ammonia-free, high-activity magnesium oxide precipitant was prepared, and its influence on the rare earth precipitation behavior was investigated. Meanwhile, XRD, SEM, and TG-DTG characterization techniques were employed to systematically compare and analyze the precipitation products derived from different magnesium oxide systems. The results show that the reactivity of the prepared magnesium oxide is significantly higher than that of industrial magnesium oxide. Using active magnesium oxide slurry as the precipitant under the optimal precipitation condition (molar ratio of 8, reaction temperature of 90 ℃, and reaction time of 4 h), a precipitation product with a purity of 37.45% and a precipitation rate of 96.17% can be obtained. In contrast, when industrial magnesium oxide slurry is used as the precipitant, the product purity is 32.07% and the precipitation rate is 90.17%, both of which are significantly lower than those achieved in the active magnesium oxide system. The mixed rare earth oxides from the active magnesium oxide system exhibit distinct diffraction peaks for Y₂O₃ and Dy₂O₃. Furthermore, the crystallinity of the products is superior to that of the industrial magnesium oxide system, characterized by a dense and smooth surface, clear contours, and uniform particles. The research results can provide new theoretical and technical support for the green chemical extraction of ionic rare earth ores.

, authors=Jiangfeng Guo^{1, 2}, Fanxin Xie², Lei Gong², Hepeng Zhou^{1, 2}, Yongbing Zhang^{1, 2}, Meifen Lei², Xianping Luo¹, authorsList=Jiangfeng Guo, Fanxin Xie, Lei Gong, Hepeng Zhou, Yongbing Zhang, Meifen Lei, Xianping Luo, authorCompany=null, correspAuthors=Hepeng Zhou, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1321866395898458594, articleId=1321866394237514208, tenantId=1146029695717560320, journalId=1225396423026438145, language=CN, title=无氨高活性氧化镁沉淀提取离子型稀土试验及机理研究, columnId=1226462297560892399, journalTitle=矿业研究与开发, columnName=选矿与资源综合利用, runingTitle=null, highlight=null, articleAbstract=

离子型稀土矿铵盐沉淀提取稀土过程会导致受纳水体富营养化、水生态平衡破坏，引发周围土壤酸化板结、威胁人类健康等连锁生态问题。针对此类氨氮污染问题，以龙南某离子型稀土矿浸出液为研究对象，制备了轻烧无氨高活性氧化镁沉淀剂，研究其对稀土沉淀行为的影响；同时采用XRD、SEM、TG-DTG表征技术，对不同氧化镁体系的沉淀产物进行了系统对比分析。结果表明：所制备氧化镁反应活性显著高于工业氧化镁。采用活性氧化镁浆液作沉淀剂，在最佳沉淀条件（摩尔比为8、反应温度为90 ℃、反应时间为4 h）下可获得纯度为37.45%、沉淀率为96.17%的沉淀产物；以工业氧化镁浆液作沉淀剂时，沉淀产物纯度为32.07%，沉淀率为90.17%，均显著低于活性氧化镁体系。活性氧化镁体系的稀土混合氧化物出现明显的Y₂O₃、Dy₂O₃等衍射峰，且产物结晶性能优于工业氧化镁体系，具有表面致密光滑、轮廓清晰、颗粒均匀的特征。研究结果为离子型稀土矿绿色化学提取提供了新的理论与技术支撑。

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郭江凤（2000—），女，河北邯郸人，硕士研究生，主要研究方向为战略关键金属高效提取。E-mail: 18331883454@163.com

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郭江凤（2000—），女，河北邯郸人，硕士研究生，主要研究方向为战略关键金属高效提取。E-mail: 18331883454@163.com

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