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首页> 外文会议>International Conference on Alternative Routes of Iron and Steelmaking ICARISM'99, Sep 15-17, 1997, Perth, WA >Ore Characterisation and Davis Tube Testing in Upgrading Magnetite Iron Ore for DRI Feed
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Ore Characterisation and Davis Tube Testing in Upgrading Magnetite Iron Ore for DRI Feed

机译：DRI提纯磁铁矿铁矿石的矿石表征和戴维斯管测试

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Davis tube tests were conducted on a Koolanooka magnetite iron ore sample, supplied by Kingstream Steel Ltd, to determine the optimum grind size, maximum iron recovery and the cleanness of the products from low intensity magnetic separation (LIMS). The ore sample contained 38.6 per cent iron, 37.8 per cent silica, 6.5 per cent magnesia and 0.54 per cent alumina. XRD and microscopic examination showed that the main minerals in the ore were amphibole (42 per cent), magnetite (39 per cent), and quartz (14 per cent). Amphibole, (Mg, Ca, Fe)_7Si_8O_(22)@2(OH), containing 50.3 per cent SiO_2, 35 per cent FeO and 11.5 per cent MgO is the main gangue mineral in the ore, and about 30 per cent of the total iron in the ore is contained in the amphibole. Heavy liquid separation tests showed that it is very difficult to separate iron from silica by gravity separation to obtain a high quality iron concentrate. Three grind sizes were initially tested, ie 45, 38 and 20 (μm. It was found that grinding to 100 per cent -38 μm (P80 of 29 μm) appeared to be the best option for liberating the magnetite from gangue minerals. The iron recovery to the LIMS magnetic product for the 100 per cent -38 μm sample reached 73 per cent and the iron content was 65 per cent. Further test work suggested that the optimum grind size was a P_(80) of 25 μm.
机译：在由Kingstream Steel Ltd提供的Koolanooka磁铁矿样品上进行了戴维斯管测试，以确定最佳研磨尺寸，最大铁回收率和低强度磁选（LIMS）产品的清洁度。矿石样品中铁含量为38.6％，二氧化硅为37.8％，氧化镁为6.5％，氧化铝为0.54％。 X射线衍射和显微镜检查表明，矿石中的主要矿物为闪石（42％），磁铁矿（39％）和石英（14％）。闪石（（Mg，Ca，Fe）_7Si_8O_（22）@ 2（OH），包含50.3％的SiO_2、35％的FeO和11.5％的MgO是矿石中的主要mineral石矿物，约占矿石的30％闪石中含有矿石中的总铁。重液分离测试表明，通过重力分离很难从二氧化硅中分离铁以获得高质量的铁精矿。最初测试了三种研磨尺寸，即45、38和20（μm。发现研磨至100％-38μm（P80为29μm）似乎是从脉石矿物中释放磁铁矿的最佳选择。 100％-38μm样品的LIMS磁性产品回收率达到73％，铁含量为65％，进一步的测试工作表明，最佳研磨尺寸为P_（80）为25μm。

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