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首页> 外文期刊>ISIJ international >Slag/Metal Separation from H2-Reduced High Phosphorus Oolitic Hematite
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Slag/Metal Separation from H2-Reduced High Phosphorus Oolitic Hematite

机译：H 2 还原的高磷沸石赤铁矿的渣/金属分离

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A process of H_(2) reduction followed by the slag/metal separation for the utilization of high-phosphorus oolitic hematite has been proposed. The H_(2) reduction was conducted at 1073 K in a horizontal rotary electric resistance furnace, which significantly promotes the metallization ratio of reduced ore fines. Thermodynamic calculation of H_(2) reduction for apatite and XRD analysis of ore samples before and after H_(2) reduction confirmed that gangue minerals containing P, Al and Si in oolitic hematite hardly be reduced. The slag/metal separation was carried out in an induction furnace at 1873 K. After separation, metal block and slag were obtained, and most of gangue minerals combined with lime and calcium fluoride formed the slag, but some impurities remained in the form of slag inclusions in the metal. Based on the SEM-EDS examination of P-containing slag inclusions and ternary phase diagram of Fe–P–O system computed by FactSage~(TM) 6.4 at 1873 K, phosphorus in the metal product can be precipitated as iron phosphate or iron phosphide, and the evolution of P-containing slag inclusions is Fe_(2)P(l) + Fe_(3)(PO_(4))_(2)(l)→Fe_(3)(PO_(4))_(2)(l)→FeO(l) along with the increase of slag basicity, melt separation time and additive CaF_(2). A satisfactory metal product with 99.80 wt% T. Fe, 0.027 wt% P, 0.0013 wt% Si, 0.004 wt% Al and 0.05 wt% O was achieved by the slag/metal separation under the optimum conditions: slag basicity of 2, melt separation time of 10 min, CaF_(2) mixing ratio of 4 wt% and metallization ratio of reduced fines of 85.9%.
机译：提出了一种还原H_（2），然后进行渣/金属分离的方法，以利用高磷橄榄岩赤铁矿。在水平旋转电阻炉中于1073 K进行H_（2）还原，这显着提高了还原矿粉的金属化率。磷灰石还原H_（2）的热力学计算以及还原H_（2）前后的矿石样品XRD分析证实，硬质赤铁矿中含有P，Al和Si的脉石矿物几乎不会还原。炉渣/金属的分离在感应炉中于1873 K进行。分离后，得到金属块和炉渣，大多数石矿物与石灰和氟化钙结合形成炉渣，但一些杂质仍以炉渣的形式保留金属中的夹杂物。根据SEM-EDS对含P渣夹杂物的检查以及FactSage〜（TM）6.4在1873 K下计算的Fe-P-O体系的三元相图，金属产物中的磷会沉淀为磷酸铁或磷化铁，并且含P渣夹杂物的演化为Fe_（2）P（l）+ Fe_（3）（PO_（4））_（2）（l）→Fe_（3）（PO_（4））_（ 2）（l）→FeO（l）随炉渣碱度，熔体分离时间和添加剂CaF_（2）的增加而增加。通过在最佳条件下进行炉渣/金属分离，可得到令人满意的金属产品，其中铁，铁含量分别为99.80％，磷0.027％，硅0.0013％，硅0.004％，铝0.054％。分离时间为10分钟，CaF_（2）的混合比例为4 wt％，还原粉的金属化率为85.9％。

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