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The finely disseminated hematite-magnetite ore with a TFe grade of 34.31% from Hunan was taken in a research, and a process of rough grinding followed by low intensity magnetic separation (LIMS) was adopted to separate magnetite from hematite. The roughing concentrate was then subjected to regrinding and two-stage cleaning to obtain magnetite concentrate. And the obtained LIMS tailings were then subjected to regrinding, high intensity magnetic separation (HIMS) and reverse flotation for purification, generating hematite concentrate. Based on condition tests, a whole-process test was carried out, producing a magnetite concentrate grading 62.08% TFe at 22.75% recovery, and a hematite concentrate grading a 65.22% TFe at 47.87% recovery. The total iron concentrate was obtained grading 64.17% TFe at 70.62% recovery, and the contents of harmful elements P and S were lower than 0.05%. It is shown that this processing technique can achieve comprehensive recovery of hematite and magnetite through staged grinding and the separation between magnetite and hematite. The produced concentrate has its indicators up to the follow-up requirements for iron-making raw materials.

, authors=Dayong SUN^{1, 2}, authorsList=Dayong SUN, 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=1314907889857295030, articleId=1314907887399432883, tenantId=1146029695717560320, journalId=1235980550691926019, language=CN, title=某难选赤铁矿-磁铁矿混合矿分相分步高效回收试验研究, columnId=1236276107125780707, journalTitle=矿冶工程杂志, columnName=选矿, runingTitle=null, highlight=null, articleAbstract=

以湖南某地TFe品位34.31%的微细粒嵌布赤铁矿-磁铁矿混合矿石为研究对象，采用粗磨-弱磁选分离磁铁矿和赤铁矿，粗精矿经再磨和两段精选得到磁铁矿精矿，弱磁选尾矿经再磨-强磁选-反浮选提纯获得赤铁矿精矿。在条件试验基础上，开展了全流程试验，获得了TFe品位62.08%、回收率22.75%的磁铁矿精矿以及TFe品位65.22%、回收率47.87%的赤铁矿精矿，总铁精矿TFe品位64.17%，总回收率达70.62%，有害元素P、S含量均低于0.05%。本工艺通过阶段磨矿与磁铁矿-赤铁矿分选实现了赤铁矿与磁铁矿协同回收，精矿指标满足炼铁原料要求。

, authors=孙大勇^{1, 2}, authorsList=孙大勇, authorCompany=null, correspAuthors=null, authorNote=, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=vsKCin4KS/IiuB/T1S2nRQ==, magXml=L0OHeHSNAjG2FHwaJbF+kA==, pdfUrl=null, pdf=PRg6BCc7PxS2AgGaMQ6/Vw==, pdfFileSize=507296, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=cNFJWYaN3syjYEDCU8z1sg==, mapNumber=null, fund=null)}, authors=[Author(id=1314907890499023550, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1314907887399432883, orderNo=0, firstName=null, middleName=null, lastName=null, nameCn=null, orcid=null, stid=null, country=null, authorPic=null, dead=0, email=2418361338@qq.com, emailSecond=null, emailThird=null, correspondingAuthor=0, authorType=1, ext={EN=AuthorExt(id=1314907890578715329, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1314907887399432883, authorId=1314907890499023550, language=EN, stringName=Dayong SUN, firstName=Dayong, middleName=null, lastName=SUN, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=^{1, 2}, address=^1.Changsha Institute of Mining Research Co., Ltd., Changsha 410012, Hunan, China
^2.Central South University, Changsha 410083, Hunan, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1314907890721321666, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1314907887399432883, authorId=1314907890499023550, language=CN, stringName=孙大勇, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=^{1, 2}, address=^1．长沙矿山研究院有限责任公司，湖南 长沙 410012
^2．中南大学，湖南 长沙 410083, bio={"content":"

孙大勇（1989-），男，河北唐山人，硕士，高级工程师，主要从事选矿工艺及药剂研发工作。E-mail：2418361338@qq.com

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孙大勇（1989-），男，河北唐山人，硕士，高级工程师，主要从事选矿工艺及药剂研发工作。E-mail：2418361338@qq.com

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