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Development of the Hawsons Low-Grade Magnetite

机译：霍森斯低品位磁铁矿的开发

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摘要

The rediscovery and recognition of the magnetite potential of the iron mineralisation at thernHawsons Project area 60 km south of Broken Hill has the potential for the development of arnnew series of magnetite iron-ore operations across the Braemar Iron Formation in New SouthrnWales and South Australia. Despite the low-grade of 16 per cent magnetite, the Hawsons projectrnfeasibility studies are indicating a positive business case for a large-scale 20 Mt/a of magnetiternproject for the following reasons:rn1. The mineralisation is on a huge scale, with a major potential for increases beyond the alreadyrnvery large established resource of 1.4 Bt.rn2. The mineralisation is particularly soft for crushing and grinding, with a Bond work indexrnof 6.3 and an overall comminution power requirement of 6.7 kWh/t of ore. This equates torn39 kWh/t of concentrate which is signifi cantly less than for similar projects.rn3. The mineralisation fractures easily, preferentially along grain boundaries.rn4. Location is close to mining infrastructure and a skilled workforce at Broken Hill, 60 km to thernnortheast.rn5. It is close to road and rail infrastructure for access to the resource.rn6. A high-grade, clean magnetic concentrate can be produced, with the only contaminant beingrnsilica.rnThe deposit is a sedimentary siltstone which is considerably different to other known magnetiterndeposits. This caused signifi cant differences in Davis Tube Recovery (DTR) results betweenrnlaboratories so that the softness of the ore has required a close focus on, and changes to thernlaboratory procedures. A DTR procedure has been developed to provide consistent results acrossrnthe deposit.rnCrushing and grinding test work has established a clear advantage in the use of the high-pressurerngrinding rolls (HPGR) crushing and grinding circuit for this particular ore. The power required forrncomminution using the HPGR crushing circuit is about half the power required for the Autogenousrnmilling circuit.rnTherefore, despite the low magnetite grades, the Braemar Iron Formation in New South Walesrnand South Australia has the potential be a new magnetite iron ore province.
机译：在Broken Hill以南60公里处的thernHawsons项目区重新发现并认识到铁矿化的磁铁矿潜力，有可能在新南威尔士州和南澳大利亚州的Braemar铁组中开发arnnew系列磁铁矿铁矿作业。尽管磁铁矿品位低至16％，但霍森斯（Hawsons）项目的可行性研究表明，由于以下原因，大规模20 Mt / a磁铁矿项目具有积极的商业前景：矿化规模巨大，其潜在的增长潜力已经超出已经非常庞大的1.4 Bt.rn2的既定资源。矿化对破碎和磨碎特别柔软，邦德工作指数为6.3，总粉碎功率要求为6.7千瓦时/吨矿石。这等于39千瓦时/吨精矿，比同类项目要少得多。矿化容易破裂，优先沿晶界断裂。位置靠近thernnortheast.rn5的Broken Hill，靠近采矿基础设施和熟练的劳动力。它靠近公路和铁路基础设施以获取资源。可以生产出高质量，清洁的磁精矿，唯一的污染物是二氧化硅。该矿床是沉积粉砂岩，与其他已知的磁粉矿床有很大不同。这导致了实验室之间戴维斯管回收（DTR）结果的显着差异，因此矿石的柔软性需要密切关注，并需要改变实验室程序。已经开发出一种DTR程序，以在整个矿床中提供一致的结果。粉碎和磨碎测试工作为该特定矿石使用高压粉碎辊（HPGR）粉碎和磨碎回路建立了明显的优势。使用HPGR破碎回路进行粉碎所需的功率约为自生碾磨回路所需功率的一半。因此，尽管磁铁矿品位较低，但新南威尔士州和南澳大利亚州的Braemar铁组仍有可能成为新的磁铁矿产区。

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  • 来源
    《Iron ore 2011》|2011年|p.633-638|共6页
  • 会议地点 Perth(AU)
  • 作者

    R L Koenig; K T Broekman;

  • 作者单位

    Hawsons Iron Ore Project, Carpentaria Exploration Pty Ltd, 345 Ann Street, Brisbane Qld 4000. Email: ray.koenig@capex.net.au;

    Carpentaria Exploration Pty Ltd, 345 Ann Street, Brisbane Qld 4000. Email: keith.broekman@capex.net.au;

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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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