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The occurrence state of key elements of niobium, rare earths, and titanium in Bayan Obo niobium concentrate samples was characterized before and after hydrogen reduction, and effect of hydrogen reduction condition on iron metallization rate was also explored. After 90 min reduction with flow rate of hydrogen at 300 mL/min, and reduction temperatures of 800 ℃, 850 ℃, 900 ℃, 950 ℃, 1 000 ℃, and 1 050 ℃ respectively, the corresponding metallization rates are 89.22%, 85.79%, 82.50%, 80.52%, 72.15%, and 70.64%. It is found that during hydrogen reduction process, most of iron minerals can be reduced to metallic iron, but with temperature rise, the reduction rate of iron minerals decreases due to effect of mineral powder bonding. Niobite, as the main niobium-containing phase, is easily reduced, while aeschynite and niobium-iron rutile are difficult to be reduced; bastnasite, the main rare earth-containing phase, doesn't change, while monazite can undergo thermal decomposition at 1 050 ℃; ilmenite, niobium-iron rutile and aeschynite, as the main titanium-containing phases, are difficult to be reduced.
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对白云鄂博铌精矿氢还原前后铌、稀土、钛等关键元素的赋存状态进行了表征,研究了氢还原条件对铁金属化率的影响。结果表明,氢气流量300 mL/min、还原时间90 min条件下,还原温度800 ℃、850 ℃、900 ℃、950 ℃、1 000 ℃、1 050 ℃时的金属化率分别为89.22%、85.79%、82.50%、80.52%、72.15%、70.64%。氢还原过程中,大部分铁矿物会被还原成金属铁,但随着还原温度升高,受矿粉黏结影响,铁矿物还原率降低;主要含铌矿相铌铁矿易被还原,易解石和铌铁金红石难被还原;主要含稀土矿相氟碳铈矿未发生变化,独居石在1 050 ℃下可发生热分解反应;主要含钛物相钛铁矿、铌铁金红石和易解石难被还原。
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1.Key Laboratory of Ecological Metallurgy of Multimetallic Minerals, Ministry of Education, Northeastern University, Shenyang 110819, Liaoning, China
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1.东北大学 多金属共生矿生态化冶金教育部重点实验室,辽宁 沈阳 110819
2.东北大学 冶金学院,辽宁 沈阳 110819, bio={"content":"
赵燕鲁(1996—),男,山东济宁人,硕士研究生,主要研究方向为复杂共伴生矿产资源综合回收利用。E-mail:z19862510309@163.com
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赵燕鲁(1996—),男,山东济宁人,硕士研究生,主要研究方向为复杂共伴生矿产资源综合回收利用。E-mail:z19862510309@163.com
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1.Key Laboratory of Ecological Metallurgy of Multimetallic Minerals, Ministry of Education, Northeastern University, Shenyang 110819, Liaoning, China
2.School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China
3.State Key Laboratory of Research and Comprehensive Utilization of Bayan Obo Rare Earth Resource, Baotou Research Institute of Rare Earths, Baotou 014030, Inner Mongolia, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1241406726579221109, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241406716487725135, authorId=1241406726231093845, language=CN, stringName=张波, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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1.东北大学 多金属共生矿生态化冶金教育部重点实验室,辽宁 沈阳 110819
2.东北大学 冶金学院,辽宁 沈阳 110819
3.包头稀土研究院 白云鄂博稀土资源研究与综合利用国家重点实验室,内蒙古 包头 014030, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null)}, companyList=[AuthorCompany(id=1241406725488701957, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241406716487725135, xref=1., ext=[AuthorCompanyExt(id=1241406725501284871, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241406716487725135, companyId=1241406725488701957, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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3.包头稀土研究院 白云鄂博稀土资源研究与综合利用国家重点实验室,内蒙古 包头 014030)])]), Author(id=1241406726721827461, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241406716487725135, orderNo=2, firstName=null, middleName=null, lastName=null, nameCn=null, orcid=null, stid=null, country=null, authorPic=null, dead=0, email=null, emailSecond=null, emailThird=null, correspondingAuthor=0, authorType=1, ext={EN=AuthorExt(id=1241406726885405329, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241406716487725135, authorId=1241406726721827461, language=EN, stringName=Chengjun LIU, firstName=Chengjun, middleName=null, lastName=LIU, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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1.Key Laboratory of Ecological Metallurgy of Multimetallic Minerals, Ministry of Education, Northeastern University, Shenyang 110819, Liaoning, China
2.School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1241406727011234461, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241406716487725135, authorId=1241406726721827461, language=CN, stringName=刘承军, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
1, 2, address=
1.东北大学 多金属共生矿生态化冶金教育部重点实验室,辽宁 沈阳 110819
2.东北大学 冶金学院,辽宁 沈阳 110819, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null)}, companyList=[AuthorCompany(id=1241406725488701957, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241406716487725135, xref=1., ext=[AuthorCompanyExt(id=1241406725501284871, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241406716487725135, companyId=1241406725488701957, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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1, 2, address=
1.Key Laboratory of Ecological Metallurgy of Multimetallic Minerals, Ministry of Education, Northeastern University, Shenyang 110819, Liaoning, China
2.School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1241406727304835772, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241406716487725135, authorId=1241406727099314852, language=CN, stringName=姜茂发, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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1.东北大学 多金属共生矿生态化冶金教育部重点实验室,辽宁 沈阳 110819
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H2/H2O气氛下铁氧化物相稳定区域图, figureFileSmall=JDf4HG+3wpgFiieSFwZlug==, figureFileBig=H+RDQMT8YR8T9nphnP9EoQ==, tableContent=null), ArticleFig(id=1241406731209733013, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241406716487725135, language=EN, label=null, caption=null, figureFileSmall=E3SyEu6cyDxRuwTSyGtHIQ==, figureFileBig=vQ9t4w1LG3sNw5T+tJT8pA==, tableContent=null), ArticleFig(id=1241406731285230497, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241406716487725135, language=CN, label=图4, caption=
H2/H2O气氛下铌氧化物相稳定区域图, figureFileSmall=E3SyEu6cyDxRuwTSyGtHIQ==, figureFileBig=vQ9t4w1LG3sNw5T+tJT8pA==, tableContent=null), ArticleFig(id=1241406731444614056, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241406716487725135, language=EN, label=null, caption=null, figureFileSmall=2JmhtrJoRXVGOf0IgDbB/w==, figureFileBig=K85NxM0d95eyROyR4KCbeA==, tableContent=null), ArticleFig(id=1241406731528500139, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241406716487725135, language=CN, label=图5, caption=
不同温度下氢还原白云鄂博铌精矿的金属化率, figureFileSmall=2JmhtrJoRXVGOf0IgDbB/w==, figureFileBig=K85NxM0d95eyROyR4KCbeA==, tableContent=null), ArticleFig(id=1241406731641746357, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241406716487725135, language=EN, label=null, caption=null, figureFileSmall=bEll3++LgX0sGJR5CMhrhw==, figureFileBig=CCD7fYj9WWi4RCW/6vVRCA==, tableContent=null), ArticleFig(id=1241406731754992570, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241406716487725135, language=CN, label=图6, caption=
不同温度下氢还原白云鄂博铌精矿微观形貌及Fe元素面扫描图片, figureFileSmall=bEll3++LgX0sGJR5CMhrhw==, figureFileBig=CCD7fYj9WWi4RCW/6vVRCA==, tableContent=null), ArticleFig(id=1241406731859850178, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241406716487725135, language=EN, label=null, caption=null, figureFileSmall=oQ/J7/RMvW/sB8Rq6KJ0IQ==, figureFileBig=GdgX0yfD3u6XzEAPKpewtA==, tableContent=null), ArticleFig(id=1241406731981485007, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241406716487725135, language=CN, label=图7, caption=
不同温度下氢还原白云鄂博铌精矿矿相组成SEM图, figureFileSmall=oQ/J7/RMvW/sB8Rq6KJ0IQ==, figureFileBig=GdgX0yfD3u6XzEAPKpewtA==, tableContent=null), ArticleFig(id=1241406732086342616, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241406716487725135, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| TFe | Nb2O5 | REO | TiO2 | SiO2 | MgO | CaO |
| 45.95 | 1.21 | 1.92 | 3.66 | 17.12 | 1.75 | 1.71 |
| MnO | Al2O3 | Na2O | P2O5 | K2O | SO3 | F |
| 0.64 | 0.51 | 0.26 | 0.20 | 0.19 | 0.08 | 0.76 |
), ArticleFig(id=1241406732199588832, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241406716487725135, language=CN, label=表1, caption=
白云鄂博铌精矿化学成分分析结果(质量分数)
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| TFe | Nb2O5 | REO | TiO2 | SiO2 | MgO | CaO |
| 45.95 | 1.21 | 1.92 | 3.66 | 17.12 | 1.75 | 1.71 |
| MnO | Al2O3 | Na2O | P2O5 | K2O | SO3 | F |
| 0.64 | 0.51 | 0.26 | 0.20 | 0.19 | 0.08 | 0.76 |
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| 物相 | Fe | Nb | Ti | Ce | La | O | Si | Ca | Na | Mg | Al | C | P | F | Mn |
|---|
| 铌铁矿 | 6.90 | 44.58 | — | — | — | 41.86 | 0.79 | — | — | — | — | — | 1.14 | — | 4.73 |
| 赤铁矿 | 49.37 | — | — | — | — | 50.63 | — | — | — | — | — | — | — | — | — |
| 石英 | — | — | — | — | — | 66.62 | 33.38 | — | — | — | — | — | — | — | — |
| 钠辉石 | 11.63 | — | — | — | — | 53.20 | 20.02 | — | 15.15 | — | — | — | — | — | — |
| 氟碳铈矿 | 9.92 | — | — | 30.60 | 19.77 | 27.21 | — | — | — | — | — | 1.16 | — | 11.34 | — |
| 云母 | 11.16 | — | 1.05 | — | — | 52.48 | 16.07 | — | — | 7.85 | 5.64 | — | — | — | — |
| 独居石 | — | — | — | 27.10 | 10.65 | 47.73 | — | — | — | — | — | — | 14.52 | — | — |
| 钛铁矿 | 17.20 | — | 23.22 | — | — | 58.35 | 1.24 | — | — | — | — | — | — | — | — |
| 易解石 | — | 20.53 | 11.71 | 9.00 | — | 58.76 | — | — | — | — | — | — | — | — | — |
| 铌铁金红石 | 3.90 | 18.36 | 9.54 | — | — | 61.66 | 2.98 | 2.25 | — | — | — | — | 1.31 | — | — |
), ArticleFig(id=1241406733831173103, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241406716487725135, language=CN, label=表2, caption=
白云鄂博铌精矿EDS数据(质量分数)
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| 物相 | Fe | Nb | Ti | Ce | La | O | Si | Ca | Na | Mg | Al | C | P | F | Mn |
|---|
| 铌铁矿 | 6.90 | 44.58 | — | — | — | 41.86 | 0.79 | — | — | — | — | — | 1.14 | — | 4.73 |
| 赤铁矿 | 49.37 | — | — | — | — | 50.63 | — | — | — | — | — | — | — | — | — |
| 石英 | — | — | — | — | — | 66.62 | 33.38 | — | — | — | — | — | — | — | — |
| 钠辉石 | 11.63 | — | — | — | — | 53.20 | 20.02 | — | 15.15 | — | — | — | — | — | — |
| 氟碳铈矿 | 9.92 | — | — | 30.60 | 19.77 | 27.21 | — | — | — | — | — | 1.16 | — | 11.34 | — |
| 云母 | 11.16 | — | 1.05 | — | — | 52.48 | 16.07 | — | — | 7.85 | 5.64 | — | — | — | — |
| 独居石 | — | — | — | 27.10 | 10.65 | 47.73 | — | — | — | — | — | — | 14.52 | — | — |
| 钛铁矿 | 17.20 | — | 23.22 | — | — | 58.35 | 1.24 | — | — | — | — | — | — | — | — |
| 易解石 | — | 20.53 | 11.71 | 9.00 | — | 58.76 | — | — | — | — | — | — | — | — | — |
| 铌铁金红石 | 3.90 | 18.36 | 9.54 | — | — | 61.66 | 2.98 | 2.25 | — | — | — | — | 1.31 | — | — |
), ArticleFig(id=1241406733952807927, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241406716487725135, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 样品 | 含铌物相组成 |
|---|
| 还原前 | 铌铁矿、易解石、铌铁金红石 |
| 850 ℃还原后 | 易解石、铌铁金红石 |
| 950 ℃还原后 | 易解石、铌铁金红石 |
| 1 050 ℃还原后 | 易解石、铌铁金红石 |
), ArticleFig(id=1241406734070248448, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241406716487725135, language=CN, label=表3, caption=
不同温度下氢还原白云鄂博铌精矿典型含铌物相组成
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| 样品 | 含铌物相组成 |
|---|
| 还原前 | 铌铁矿、易解石、铌铁金红石 |
| 850 ℃还原后 | 易解石、铌铁金红石 |
| 950 ℃还原后 | 易解石、铌铁金红石 |
| 1 050 ℃还原后 | 易解石、铌铁金红石 |
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