Article(id=1185887583579025493, tenantId=1146029695717560320, journalId=1185652524569653253, issueId=1185882038939825058, articleNumber=1009-5438(2025)03-0020-06, orderNo=null, doi=null, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1730390400000, receivedDateStr=2024-11-01, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1760667232650, onlineDateStr=2025-10-17, pubDate=1750780800000, pubDateStr=2025-06-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1760667232650, onlineIssueDateStr=2025-10-17, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1760667232650, creator=13701087609, updateTime=1760667232650, updator=13701087609, issue=Issue{id=1185882038939825058, tenantId=1146029695717560320, journalId=1185652524569653253, year='2025', volume='51', issue='3', pageStart='1', pageEnd='98', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=0, createTime=1760665910706, creator=13701087609, updateTime=1764316917348, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1201195470770102709, tenantId=1146029695717560320, journalId=1185652524569653253, issueId=1185882038939825058, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1201195470770102710, tenantId=1146029695717560320, journalId=1185652524569653253, issueId=1185882038939825058, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=20, endPage=25, ext={EN=ArticleExt(id=1187122782950273851, articleId=1185887583579025493, tenantId=1146029695717560320, journalId=1185652524569653253, language=EN, title=Industrial Application Practices on Beneficiation Technology of Niobium Ore in Main and East Mines of Bayan Obo, columnId=1187100781414069182, journalTitle=Science & Technology of Baotou Steel, columnName=Production Practices and Management, runingTitle=null, highlight=null, articleAbstract=
After the separation of iron and rare earth for ore in Main and East Mines of Bayan Obo, the content of Nb2O5 in rare earth flotation tailings is enriched from 0.14% to 0.19%. The bulk flotation is adopted to separate easy-floating minerals in advance so as to reduce the impacts of easy-floating minerals in desilting on subsequent niobium flotation as well as the combined process of flotation and magnetic separation that bulk flotation of tailings-selective flotation of sulfur-flotation of iron-niobium flotation of iron tailings-high intensity magnetic separation of niobium concentrate is adopted to separate niobium industrially aiming at the high content of easy-floating minerals as well as close paragenesis and inclusions of niobium minerals and iron minerals. The bulk flotation is carried out under the conditions that the proportion of size fraction of -0.043 mm for grind fineness is 90%, dosage of TD-V collecting agent is 1.0 kg/t and dosage of depressor, the sodium silicate is 2.0 kg/t, sulfur flotation is carried out under the condition that dosage of butyl xanthate is 1.4 kg/t, iron flotation is carried out under the conditions that dosage of ammonium fluosilicate is 8.5 kg/t and dosage of collecting agent, the SZ fatty acid sodium salts is 0.5 kg/t as well as niobium roughing is carried out under the condition that dosages of CMC, C5-9 and alum are 1.2 kg/t, 2.2 kg/t and 0.72 kg/t respectively. The niobium concentrate of flotation with grade of Nb2O5 of 2.21% is obtained by adopting the niobium flotation process of one roughing and one concentration as well as the niobium concentrate with grade of Nb2O5 of 4.41% and sub-niobium concentrate with grade of Nb2O5 of 0.96% are obtained through high intensity magnetic separation of 1.7 T so that recovery rate of niobium metal is 34.85% with the combination process of flotation and magnetic separation.
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白云鄂博主、东矿矿石经选铁、选稀土后,稀土浮选尾矿Nb2O5含量由0.14%富集到0.19%。针对易浮矿物含量高、铌矿物与铁矿物紧密共生且连生包裹,采用混合浮选预先将易浮矿物选出,降低沉沙中易浮矿物对后续选铌的影响,采用混合浮选尾矿-优先浮硫-浮铁-铁尾矿铌浮选-铌精矿强磁选的浮磁联合工艺进行工业选铌。在磨矿细度-0.043 mm粒级占比为90%、TD-V捕收剂用量为1.0 kg/t、抑制剂水玻璃用量为2.0 kg/t条件下进行混合浮选,在丁基黄药用量为1.4 kg/t的条件下进行硫浮选,在氟硅酸铵用量为8.5 kg/t、SZ脂肪酸钠盐类捕收剂用量为0.5 kg/t的条件下进行铁浮选,在CMC用量为1.2 kg/t、C5-9用量为2.2 kg/t、明矾用量为0.72 kg/t的条件下进行铌粗选。采用一粗一精的铌浮选流程,获得Nb2O5品位为2.21%的浮选铌精矿,再经过1.7 T强磁选,获得Nb2O5品位为4.41%的铌精矿和0.96%的次铌精矿,浮-磁联合作业铌金属回收率为34.85%。
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陈宏超(1971-),男,河南省舞阳市人,高级工程师,现从事矿产资源综合利用产业化研究工作。
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陈宏超(1971-),男,河南省舞阳市人,高级工程师,现从事矿产资源综合利用产业化研究工作。
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陈宏超(1971-),男,河南省舞阳市人,高级工程师,现从事矿产资源综合利用产业化研究工作。
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journalId=1185652524569653253, articleId=1185887583579025493, language=CN, orderNo=3, keyword=选铌), Keyword(id=1188161392306700858, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1185887583579025493, language=CN, orderNo=4, keyword=强磁选)], refs=[Reference(id=1188161394710037083, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1185887583579025493, doi=null, pmid=null, pmcid=null, year=2022, volume=42, issue=5, pageStart=659, pageEnd=668, url=null, language=null, rfNumber=[1], rfOrder=0, authorNames=罗晓锋, 杨占峰, 王振江, journalName=矿物学报, refType=null, unstructuredReference=罗晓锋, 杨占峰, 王振江, 等. 白云鄂博东矿萤石型铌-稀土-铁矿石中铌的赋存状态及分布规律[J].
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42(5):659-668., articleTitle=白云鄂博东矿萤石型铌-稀土-铁矿石中铌的赋存状态及分布规律, refAbstract=null), Reference(id=1188161394768757340, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1185887583579025493, doi=null, pmid=null, pmcid=null, year=2021, volume=null, issue=2, pageStart=120, pageEnd=126, url=null, language=null, rfNumber=[2], rfOrder=1, authorNames=黎洁, 谢贤, 吕晋芳, journalName=金属矿山, refType=null, unstructuredReference=黎洁, 谢贤, 吕晋芳, 等. 铌矿资源概述及选矿技术研究进展[J].
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2021(2):120-126., articleTitle=铌矿资源概述及选矿技术研究进展, refAbstract=null), Reference(id=1188161394831671901, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1185887583579025493, doi=null, pmid=null, pmcid=null, year=2021, volume=41, issue=3, pageStart=144, pageEnd=149, url=null, language=null, rfNumber=[3], rfOrder=2, authorNames=秦玉芳, 王其伟, 金海龙, journalName=矿产保护与利用, refType=null, unstructuredReference=秦玉芳, 王其伟, 金海龙, 等. 白云鄂博矿霓石型稀土矿石中铌的赋存状态与分布规律研究[J].
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41(3):144-149., articleTitle=白云鄂博矿霓石型稀土矿石中铌的赋存状态与分布规律研究, refAbstract=null)], funds=null, companyList=[AuthorCompany(id=1188161390473789970, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1185887583579025493, xref=null, ext=[AuthorCompanyExt(id=1188161390482178579, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1185887583579025493, companyId=1188161390473789970, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=Baotou Steel Group Baoshan Mining Co., Ltd., Baotou 014010,Inner Mongolia Autonomous Region, China), AuthorCompanyExt(id=1188161390498955796, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1185887583579025493, companyId=1188161390473789970, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=包钢集团宝山矿业有限公司,内蒙古 包头 014010)])], figs=[ArticleFig(id=1188161392457695803, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1185887583579025493, language=EN, label=null, caption=null, figureFileSmall=Y7qEseZ/WXrM5i3mK00hYQ==, figureFileBig=LsZPEQVFfY4oDLiZzy5/FQ==, tableContent=null), ArticleFig(id=1188161392512221756, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1185887583579025493, language=CN, label=图1, caption=
强磁铌精矿面扫描(Mapping)下铌矿物总览, figureFileSmall=Y7qEseZ/WXrM5i3mK00hYQ==, figureFileBig=LsZPEQVFfY4oDLiZzy5/FQ==, tableContent=null), ArticleFig(id=1188161392575136317, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1185887583579025493, language=EN, label=null, caption=null, figureFileSmall=qcDcHQ7DOlLX6CWtoyMJCQ==, figureFileBig=AjOAQHEqXGoYY5x0m7wsXg==, tableContent=null), ArticleFig(id=1188161392646439486, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1185887583579025493, language=CN, label=图2, caption=
选铌全流程图, figureFileSmall=qcDcHQ7DOlLX6CWtoyMJCQ==, figureFileBig=AjOAQHEqXGoYY5x0m7wsXg==, tableContent=null), ArticleFig(id=1188161392709354047, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1185887583579025493, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 粒度/mm | 产率 | 化学成分 | | 分布率 |
| TFe | REO | S | Nb2O5 | CaF2 | TFe | REO | S | Nb2O5 | CaF2 |
| >0.074 | 17.09 | 9.5 | 3.80 | 0.848 | 0.19 | 24.18 | | 11.14 | 20.83 | 9.44 | 17.25 | 18.09 |
| 0.043~0.074 | 23.05 | 12.7 | 4.85 | 1.614 | 0.19 | 23.25 | | 20.08 | 35.86 | 24.23 | 23.10 | 23.46 |
| 0.038~0.043 | 7.25 | 14.7 | 3.70 | 1.653 | 0.17 | 19.72 | | 7.31 | 8.61 | 7.81 | 6.77 | 6.26 |
| 0.030~0.038 | 13.51 | 14.5 | 2.80 | 1.521 | 0.17 | 19.34 | | 13.44 | 12.13 | 13.38 | 11.99 | 11.44 |
| <0.030 | 39.10 | 17.9 | 1.80 | 1.773 | 0.20 | 23.81 | | 48.02 | 22.58 | 45.15 | 40.89 | 40.76 |
| 加权平均值 | | 14.57 | 3.12 | 1.540 | 0.19 | 22.84 | | | | | | |
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稀土尾矿化学成分及粒度分析(质量分数) %
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| 粒度/mm | 产率 | 化学成分 | | 分布率 |
| TFe | REO | S | Nb2O5 | CaF2 | TFe | REO | S | Nb2O5 | CaF2 |
| >0.074 | 17.09 | 9.5 | 3.80 | 0.848 | 0.19 | 24.18 | | 11.14 | 20.83 | 9.44 | 17.25 | 18.09 |
| 0.043~0.074 | 23.05 | 12.7 | 4.85 | 1.614 | 0.19 | 23.25 | | 20.08 | 35.86 | 24.23 | 23.10 | 23.46 |
| 0.038~0.043 | 7.25 | 14.7 | 3.70 | 1.653 | 0.17 | 19.72 | | 7.31 | 8.61 | 7.81 | 6.77 | 6.26 |
| 0.030~0.038 | 13.51 | 14.5 | 2.80 | 1.521 | 0.17 | 19.34 | | 13.44 | 12.13 | 13.38 | 11.99 | 11.44 |
| <0.030 | 39.10 | 17.9 | 1.80 | 1.773 | 0.20 | 23.81 | | 48.02 | 22.58 | 45.15 | 40.89 | 40.76 |
| 加权平均值 | | 14.57 | 3.12 | 1.540 | 0.19 | 22.84 | | | | | | |
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| TFe | FeO | SiO2 | P | S | F | K2O | Na2O | CaO | MgO |
| 25.10 | 1.90 | 40.41 | 0.12 | 1.569 | 1.09 | 0.41 | 6.18 | 2.00 | 2.52 |
| Al2O3 | MnO | TiO2 | Zn | BaO | Sc2O3 | Nb2O5 | ThO2 | REO | Ig |
| 0.88 | 0.83 | 0.90 | 0.031 | 0.36 | 0.034 662 | 0.26 | 0.020 | 1.31 | 2.81 |
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混合沉沙多元素分析结果及烧损(质量分数) %
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| TFe | FeO | SiO2 | P | S | F | K2O | Na2O | CaO | MgO |
| 25.10 | 1.90 | 40.41 | 0.12 | 1.569 | 1.09 | 0.41 | 6.18 | 2.00 | 2.52 |
| Al2O3 | MnO | TiO2 | Zn | BaO | Sc2O3 | Nb2O5 | ThO2 | REO | Ig |
| 0.88 | 0.83 | 0.90 | 0.031 | 0.36 | 0.034 662 | 0.26 | 0.020 | 1.31 | 2.81 |
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| 铁矿物 | 萤石 | 白云石、方解石 | 硅酸盐矿物 | 稀土矿物 | 重晶石、磷灰石 | 石英、长石 | 铌矿物 | 其他 |
| 25.73 | 2.96 | 2.01 | 43.01 | 2.45 | 0.93 | 20.1 | 0.96 | 1.85 |
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混合沉沙矿物组成分析结果(体积分数) %
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| 铁矿物 | 萤石 | 白云石、方解石 | 硅酸盐矿物 | 稀土矿物 | 重晶石、磷灰石 | 石英、长石 | 铌矿物 | 其他 |
| 25.73 | 2.96 | 2.01 | 43.01 | 2.45 | 0.93 | 20.1 | 0.96 | 1.85 |
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| TFe | Fe-磁铁矿 | Fe-赤/褐铁矿 | Fe-硅酸铁 | Fe-黄铁矿 | Fe-菱铁矿 |
| 25.10 | 1.3 | 12.5 | 9.64 | 1.26 | 0.4 |
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混合沉沙铁物相分析结果(质量分数) %
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| TFe | Fe-磁铁矿 | Fe-赤/褐铁矿 | Fe-硅酸铁 | Fe-黄铁矿 | Fe-菱铁矿 |
| 25.10 | 1.3 | 12.5 | 9.64 | 1.26 | 0.4 |
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| TFe | FeO | SiO2 | P | S | F | K2O | Na2O | CaO | MgO |
| 19.04 | 1.85 | 48.46 | 0.12 | 0.18 | 1.13 | 0.37 | 6.14 | 2.12 | 2.46 |
| Al2O3 | MnO | TiO2 | Zn | BaO | Sc2O3 | Nb2O5 | ThO2 | REO | Ig |
| 0.9 | 0.81 | 0.94 | 0.016 | 0.33 | 0.034 834 | 0.28 | 0.022 | 0.65 | 0.849 |
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硫浮选尾矿多元素分析结果及烧损(质量分数) %
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| TFe | FeO | SiO2 | P | S | F | K2O | Na2O | CaO | MgO |
| 19.04 | 1.85 | 48.46 | 0.12 | 0.18 | 1.13 | 0.37 | 6.14 | 2.12 | 2.46 |
| Al2O3 | MnO | TiO2 | Zn | BaO | Sc2O3 | Nb2O5 | ThO2 | REO | Ig |
| 0.9 | 0.81 | 0.94 | 0.016 | 0.33 | 0.034 834 | 0.28 | 0.022 | 0.65 | 0.849 |
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| 铁矿物 | 萤石 | 白云石、方解石 | 硅酸盐矿物 | 稀土矿物 | 重晶石、磷灰石 | 石英、长石 | 铌矿物 | 其他 |
| 22.13 | 3.12 | 2.78 | 46.42 | 0.96 | 0.5 | 22.09 | 0.5 | 1.5 |
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硫浮选尾矿矿物组成分析结果(体积分数) %
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| 铁矿物 | 萤石 | 白云石、方解石 | 硅酸盐矿物 | 稀土矿物 | 重晶石、磷灰石 | 石英、长石 | 铌矿物 | 其他 |
| 22.13 | 3.12 | 2.78 | 46.42 | 0.96 | 0.5 | 22.09 | 0.5 | 1.5 |
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| TFe | FeO | SiO2 | P | S | F | K2O | Na2O | CaO | MgO |
| 17.35 | 1.10 | 52.86 | 0.053 | 0.042 | 1.14 | 0.62 | 7.63 | 1.39 | 3.11 |
| Al2O3 | MnO | TiO2 | Zn | BaO | Sc2O3 | Nb2O5 | ThO2 | REO | Ig |
| 1.21 | 0.77 | 0.30 | 0.011 | 0.19 | 0.041 177 | 0.31 | 0.041 | 0.28 | 1.06 |
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铁尾矿多元素分析结果及烧损(质量分数) %
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| TFe | FeO | SiO2 | P | S | F | K2O | Na2O | CaO | MgO |
| 17.35 | 1.10 | 52.86 | 0.053 | 0.042 | 1.14 | 0.62 | 7.63 | 1.39 | 3.11 |
| Al2O3 | MnO | TiO2 | Zn | BaO | Sc2O3 | Nb2O5 | ThO2 | REO | Ig |
| 1.21 | 0.77 | 0.30 | 0.011 | 0.19 | 0.041 177 | 0.31 | 0.041 | 0.28 | 1.06 |
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| 铁矿物 | 萤石 | 白云石、方解石 | 硅酸盐矿物 | 稀土矿物 | 重晶石、磷灰石 | 石英、长石 | 铌矿物 | 其他 |
| 22.55 | 1.83 | 1.26 | 55.94 | 0 | 0 | 15.55 | 1.12 | 1.4 |
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铁尾矿矿物组成分析结果(体积分数) %
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| 铁矿物 | 萤石 | 白云石、方解石 | 硅酸盐矿物 | 稀土矿物 | 重晶石、磷灰石 | 石英、长石 | 铌矿物 | 其他 |
| 22.55 | 1.83 | 1.26 | 55.94 | 0 | 0 | 15.55 | 1.12 | 1.4 |
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| TFe | FeO | SiO2 | P | S | F | K2O | Na2O | CaO | MgO |
| 51.10 | 4.25 | 9.13 | 0.093 | 0.221 | 1.40 | 0.14 | 1.58 | 1.46 | 0.71 |
| Al2O3 | MnO | TiO2 | Zn | BaO | Sc2O3 | Nb2O5 | ThO2 | REO | Ig |
| 0.94 | 0.47 | 3.89 | 0.014 | 0.32 | 0.022 05 | 2.21 | 0.11 | 2.17 | 1.00 |
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铌浮精矿多元素分析结果及烧损(质量分数) %
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| TFe | FeO | SiO2 | P | S | F | K2O | Na2O | CaO | MgO |
| 51.10 | 4.25 | 9.13 | 0.093 | 0.221 | 1.40 | 0.14 | 1.58 | 1.46 | 0.71 |
| Al2O3 | MnO | TiO2 | Zn | BaO | Sc2O3 | Nb2O5 | ThO2 | REO | Ig |
| 0.94 | 0.47 | 3.89 | 0.014 | 0.32 | 0.022 05 | 2.21 | 0.11 | 2.17 | 1.00 |
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| 铁矿物 | 萤石 | 白云石、方解石 | 硅酸盐矿物 | 稀土矿物 | 磷灰石、重晶石 | 石英、长石 | 其他(包括铌矿物) |
| 67.8 | 0.1 | 2.5 | 18.9 | 3.3 | 0.5 | 0.6 | 6.3 |
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铌浮精矿矿物组成分析结果(体积分数) %
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| 铁矿物 | 萤石 | 白云石、方解石 | 硅酸盐矿物 | 稀土矿物 | 磷灰石、重晶石 | 石英、长石 | 其他(包括铌矿物) |
| 67.8 | 0.1 | 2.5 | 18.9 | 3.3 | 0.5 | 0.6 | 6.3 |
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| TFe | FeO | SiO2 | P | S | F | K2O | Na2O | CaO | MgO |
| 52.72 | 5.98 | 3.36 | 0.070 | 0.544 | 0.40 | 0.12 | 0.30 | 1.12 | 0.37 |
| Al2O3 | MnO | TiO2 | Zn | BaO | Sc2O3 | Nb2O5 | ThO2 | REO | Ig |
| 0.58 | 1.17 | 6.07 | 0.046 | 0.21 | 0.012 93 | 4.41 | 0.21 | 3.70 | 0.10 |
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强磁铌精矿多元素分析结果及烧损(质量分数) %
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| TFe | FeO | SiO2 | P | S | F | K2O | Na2O | CaO | MgO |
| 52.72 | 5.98 | 3.36 | 0.070 | 0.544 | 0.40 | 0.12 | 0.30 | 1.12 | 0.37 |
| Al2O3 | MnO | TiO2 | Zn | BaO | Sc2O3 | Nb2O5 | ThO2 | REO | Ig |
| 0.58 | 1.17 | 6.07 | 0.046 | 0.21 | 0.012 93 | 4.41 | 0.21 | 3.70 | 0.10 |
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| 铁矿物 | 萤石 | 白云石、方解石 | 硅酸盐矿物 | 稀土矿物 | 磷灰石、重晶石 | 石英、长石 | 其他(包括铌矿物) |
| 67.6 | 1.2 | 0.5 | 7.7 | 5.4 | 0.3 | 6.8 | 10.5 |
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强磁铌精矿矿物组成分析结果(体积分数) %
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| 铁矿物 | 萤石 | 白云石、方解石 | 硅酸盐矿物 | 稀土矿物 | 磷灰石、重晶石 | 石英、长石 | 其他(包括铌矿物) |
| 67.6 | 1.2 | 0.5 | 7.7 | 5.4 | 0.3 | 6.8 | 10.5 |
), ArticleFig(id=1188161394387075671, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1185887583579025493, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 赤铁矿 | 黄铁矿 | 磁黄铁矿 | 其他 |
| 53 | 0.8 | 0.7 | 45.5 |
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强磁铌精矿铁物相分析(质量分数) %
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| 赤铁矿 | 黄铁矿 | 磁黄铁矿 | 其他 |
| 53 | 0.8 | 0.7 | 45.5 |
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| 名称 | Nb2O5含量 | 铌金属回收率 |
| 稀土尾矿 | 0.19 | 100 |
| 混合沉沙 | 0.26 | 92.21 |
| 硫尾矿 | 0.28 | 68.76 |
| 铁尾矿 | 0.31 | 23.05 |
| 铌浮选精矿 | 2.21 | 7.98 |
| 强磁铌精矿 | 4.41 | 3.76 |
| 强磁铌次精矿 | 0.96 | 4.22 |
), ArticleFig(id=1188161394575819354, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1185887583579025493, language=CN, label=表14, caption=
选铌全流程数质量指标(质量分数) %
, figureFileSmall=null, figureFileBig=null, tableContent=
| 名称 | Nb2O5含量 | 铌金属回收率 |
| 稀土尾矿 | 0.19 | 100 |
| 混合沉沙 | 0.26 | 92.21 |
| 硫尾矿 | 0.28 | 68.76 |
| 铁尾矿 | 0.31 | 23.05 |
| 铌浮选精矿 | 2.21 | 7.98 |
| 强磁铌精矿 | 4.41 | 3.76 |
| 强磁铌次精矿 | 0.96 | 4.22 |
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