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首页> 外文会议>Iron ore 2011 >Geometallurgy and Ore Processing of the Hibbing Taconite Lake Superior- Type Magnetite Taconite Deposit, Mesabi Iron Range, Minnesota, USA
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Geometallurgy and Ore Processing of the Hibbing Taconite Lake Superior- Type Magnetite Taconite Deposit, Mesabi Iron Range, Minnesota, USA

机译：美国明尼苏达州梅萨比铁矿区的希宾塔康特湖苏必利尔湖型磁铁矿塔康石矿床的矿物冶金和矿石加工

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摘要

Hibbing Taconite is a Lake Superior-type granular magnetite taconite deposit occurring within thernBiwabik Iron Formation along Minnesota's central Mesabi Iron Range. The deposit is situated onrnthe northern margin of the Proterozoic Animikie Basin. The deposit strikes northeast, dips gentlyrnsoutheast, and occupies 10 km of strike length. Mining focuses on 50 m of granular cherty andrnlaminated slaty taconite within the Lower Cherty member.rnOres generally consist of a quartz, magnetite, siderite, ankerite, minnesotaite, stilpnomelane, andrnhaematite mineral assemblage. Processing is optimised by exploiting the physical and chemicalrnvariations that exist between three major ore types. Taconite ore averages 20 per cent magnetic ironrn(MagFe), 27 per cent weight recovery (WtRec) and produces a fi nal concentrate with 4.5 per centrnsilica (SiO_2). Since 1976, production has totalled approximately 237 million long tons (Mlt) ofrnpellets (8 Mlt per year rated capacity).rnOre processing uses a simple fl ow sheet of autogenous grinding (<0.044 mm) followed by twornphases of wet magnetic separation, fi ltering, limestone/bentonite addition, balling, and fi ring torncreate pellets averaging 66 per cent total iron. A Liberation Index (LIS) is used as a primary guidernfor ore grading and metallurgical control. Grind requirements, magnetite liberation and silicarngrade are closely monitored to ensure plant optimisation and product quality.rnA recent program of benefi ciation of low-grade ores by in-pit crushing and dry magnetic cobbingrnhas demonstrated that low-grade ores (<17 per cent MagFe, <25 per cent WtRec) can achieve arnsignifi cant metallurgical upgrade (up to 25 per cent MagFe and 40 per cent WtRec). This operationrnrecovers 60 per cent of the total crushed volume, and has a calculated effi ciency factor (magneticrniron recovery) of 79 per cent. This paper discusses the benefi ts of this upgrading and its effects onrnore blending and processing.
机译：Hibbing Taconite是一种苏必利尔湖型粒状磁铁矿水辉石矿床，位于明尼苏达州中部Mesabi铁矿床的rnBiwabik铁矿层内。该矿床位于元古代Animikie盆地的北边缘。该矿床向东北走向，向东南缓慢倾斜，走向长度为10 km。采矿主要集中在下切尔蒂成员内的50 m颗粒状的钙质和层状片状水滑石上。矿石通常由石英，磁铁矿，菱铁矿，方铁矿，明尼苏铁矿，stimelnomelane和赤铁矿矿物组合组成。通过利用三种主要矿石类型之间存在的物理和化学变化来优化加工过程。 con石矿石平均含铁量为20％，回收铁含量为27％（重量百分比），最终精矿含4.5％的二氧化硅（SiO_2）。自1976年以来，共生产了约2.37亿长吨（Mlt）的球团矿（每年8 Mlt的额定能力）。矿石加工使用简单的自流磨片（<0.044 mm）然后进行湿法磁选，过滤的两个阶段，石灰石/膨润土的添加，球化和环网撕裂会产生平均含铁量为66％的球团。解放指数（LIS）用作矿石分级和冶金控制的主要指南。严格监控研磨要求，磁铁矿的释放和硅的品位，以确保工厂优化和产品质量。rn最近的一项通过坑内破碎和干磁选矿选矿低品位矿石的计划rn表明低品位矿石（<17％MagFe ，<25％的WtRec）可以实现无意义的冶金升级（高达25％的MagFe和40％的WtRec）。该操作可回收总压碎体积的60％，计算出的效率因数（电磁铁回收率）为79％。本文讨论了这种升级的好处及其对混合和加工的影响。

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  • 来源
    《Iron ore 2011》|2011年|p.271-280|共10页
  • 会议地点 Perth(AU)
  • 作者

    J D Lubben; P K Jongewaard; M E Young;

  • 作者单位

    Hibbing Taconite Company–Cliff s Natural Resources, 4950 County Highway 5 North, Hibbing MN 55746, USA. Email: jared.lubben@cliff snr.com;

    Cliff s Technical Group–Cliff s Natural Resources, 1200 West County Road 16, Forbes MN 55738, USA. Email: peter.jongewaard@cliff snr.com;

    Cliff s Natural Resources, 200 Public Square, Suite 3300, Cleveland OH 44114, USA. Email: michael.young@cliff snr.com;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 铁矿石;
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