Article(id=1311360850858967163, tenantId=1146029695717560320, journalId=1146123346816638986, issueId=1311360814477575028, articleNumber=null, orderNo=null, doi=10.13426/j.cnki.yky.2025.12.19, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1767110400000, receivedDateStr=2025-12-31, revisedDate=1769702400000, revisedDateStr=2026-01-30, acceptedDate=null, acceptedDateStr=null, onlineDate=1790582390750, onlineDateStr=2026-09-28, pubDate=1787155200000, pubDateStr=2026-08-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1790582390750, onlineIssueDateStr=2026-09-28, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1790582390750, creator=13701087609, updateTime=1790582390750, updator=13701087609, issue=Issue{id=1311360814477575028, tenantId=1146029695717560320, journalId=1146123346816638986, year='2026', volume='45', issue='3', pageStart='1', pageEnd='172', issueExtLink='null', onlineDate='null', pubDate='1787155200000', pubDateStr='2026-08-20', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=1, specialIssue=null, createTime=1790582382077, creator='13701087609', updateTime=1790583873531, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1311367070160355561, tenantId=1146029695717560320, journalId=1146123346816638986, issueId=1311360814477575028, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1311367070160355562, tenantId=1146029695717560320, journalId=1146123346816638986, issueId=1311360814477575028, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=131, endPage=138, ext={EN=ArticleExt(id=1311360851144179837, articleId=1311360850858967163, tenantId=1146029695717560320, journalId=1146123346816638986, language=EN, title=Migration Behavior and Radiological Impact Characteristics of Thorium-232 in Beneficiation and Smelting Processes of Monazite, columnId=1175805042197152439, journalTitle=Uranium Mining and Metallurgy, columnName=Safety and Environment Protection, runingTitle=null, highlight=null, articleAbstract=

This study investigated typical enterprises engaged in the integrated beneficiation and smelting of monazite, with a focus on characterizing the behavior of thorium-232 throughout the production chain. Through systematic analysis of activity concentrations in various raw materials and products from different manufacturers, the pathways and final distribution of thorium-232 across the entire technological process were traced. Workplace monitoring of thoron concentrations was carried out to assess inhalation hazards, collectively revealing the distinct migration and enrichment patterns of thorium-232 and its associated radiological exposure risks. Through the analysis of the chemical composition in monazite ore, it is found that the REO content is the key factor influencing the activity concentration of thorium-232. The monazite dressing process primarily involves stages such as shaking table gravity separation, drying, and electromagnetic separation, while the smelting process includes magnetic separation, alkali decomposition, and hydrochloric acid preferential dissolution. Thorium-232 exhibits a pronounced tendency for selective enrichment within these sequences. Comprehensive data on chemical composition and radionuclide activity from multiple enterprises in Hainan Province demonstrate that about 92.15% of thorium-232 is concentrated into the monazite product during electromagnetic separation. Further analysis based on material chemistry and activity measurements from a smelting enterprise in Hunan Province indicates that about 96.56% of the thorium-232 is subsequently transferred and further enriched in the residue generated from the hydrochloric acid preferential dissolution stage. It is noteworthy that emissions of thorium-232 in waste gases and process waters throughout both dressing and smelting operations are negligible relative to the total inventory.

, authors=Sirong TIAN^{1, 2, 3}, Hongbo FAN^{2, 3}, Xiang GAO^{2, 3}, Jie GAO⁴, authorsList=Sirong TIAN, Hongbo FAN, Xiang GAO, Jie GAO, authorCompany=null, correspAuthors=null, 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=1311360851374866558, articleId=1311360850858967163, tenantId=1146029695717560320, journalId=1146123346816638986, language=CN, title=独居石选冶过程中钍-232迁移规律与放射性影响特征, columnId=1175805042343953080, journalTitle=铀矿冶, columnName=安全·环保, runingTitle=null, highlight=null, articleAbstract=

以典型独居石选冶企业为研究对象，通过分析不同企业原料和产品中钍-232的比活度，了解钍-232在整个工艺流程中的分布迁移规律，并对工作场所钍射气浓度进行监测，揭示钍-232在工艺过程中的分布迁移特性。研究表明，国外进口独居石矿的矿物学组成，特别是其中稀土氧化物（REO）的含量，是影响钍-232比活度水平的关键因素。分选过程仅涉及物理方法（如重选、磁选和电选），未发生化学转化，钍-232的分布主要受其在原料中的赋存状态控制。电磁选分选过程中，约92.15%的钍-232富集于独居石精矿产品中；冶炼阶段，盐酸优溶工序是钍-232的主要迁移富集工序，约96.56%的钍-232通过此工序被浓缩于产生的优溶渣中。选冶过程中，生产场所内钍射气浓度较高的场所主要为储存独居石和尾渣的封闭场所。对其采取实体屏蔽后，库外钍射气浓度显著降低。

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