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首页> 外文会议>T. T. Chen honorary symposium on hydrometallurgy, electrometallurgy and materials characterization >CHARACTERIZATION OF MEXICAN MAGNETIC CONCENTRATE SAMPLES FOR TRACE ELEMENTS: NI, CU, ZN, S AND P
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CHARACTERIZATION OF MEXICAN MAGNETIC CONCENTRATE SAMPLES FOR TRACE ELEMENTS: NI, CU, ZN, S AND P

机译：墨西哥磁性富集样品中痕量元素：NI，CU，ZN，S和P的表征

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Three samples received from the EAF shop were characterized by chemical, X-ray diffraction (XRD), optical microscopy (OM) and scanning electron microscopy (SEM) methods. The objective of this characterization work was to investigate the occurrence of nickel, copper, zinc, sulfur and phosphorus and to identify their origin and associations with iron minerals in the concentrate samples from the mines. The samples were identified as MINERAL, PELLET, and HRD. The latter is the DRI product. All three samples were received as fine powders. The results indicate that, in the mineral sample, magnetite is the major iron oxide mineral with hematite as a second phase based on the OM and XRD studies. Pyrite [FeS_2], chalcopyrite [CuFeS_2] and bravoite [(Fe,Ni)S_2] are the major sulfide minerals. Trace amounts of apatite [Ca_5(PO_4)_3(F,Cl,OH)], wardite [Na_4CaAl_(12)(P_4)_8(OH)_8 6H_2O], giniite [Fe_5(PO_4)_4(OH)_3 2H_2O] and vivianite [Fe_3(PO_4)_2 8H_2O] were identified by SEM and XRD. Microscopic studies also indicated that most of the sulfide grains in the mineral sample are present either as liberated fine particles (about 10 microns) or as inclusions within the magnetite and hematite grains. XRD studies revealed magnetite as the major mineral with subordinate amounts of hematite and pyrite confirming the microscopic findings. Copper, nickel, and zinc are mainly present as chalcopyrite, bravoite, and franklinite [(Zn,Mn,Fe)(Fe,Mn)_2O_4] in trace amounts in the mineral samples, respectively. Impurities carry over to the pellet and HRD samples. Chemical analyses of the three iron-bearing samples indicate that sulfur and phosphorus in the pellet sample exceeded the specification. Since liberated pyrite and chalcopyrite particles were observed in both the mineral and pellet samples, magnetic and flotation processing routes should be effective for sulfide removal but at the cost of iron losses. The high phosphorus content of all three samples indicates that there are phosphates which are difficult to remove by the current concentrating processes (magnetic separation and flotation).
机译：通过化学，X射线衍射（XRD），光学显微镜（OM）和扫描电子显微镜（SEM）方法对从EAF车间收到的三个样品进行了表征。表征工作的目的是调查镍，铜，锌，硫和磷的存在，并确定其来源以及与矿山精矿样品中铁矿物质的关系。样品鉴定为MINERAL，PELLET和HRD。后者是DRI产品。所有三个样品均以细粉形式接收。结果表明，根据OM和XRD研究，磁铁矿是主要的氧化铁矿物，其中赤铁矿为第二相。黄铁矿[FeS_2]，黄铜矿[CuFeS_2]和黄铜矿[（Fe，Ni）S_2]是主要的硫化物矿物。痕量磷灰石[Ca_5（PO_4）_3（F，Cl，OH）]，方解石[Na_4CaAl_（12）（P_4）_8（OH）_8 6H_2O]，菱铁矿[Fe_5（PO_4）_4（OH）_3 2H_2O]和用电镜和X射线衍射仪鉴定了堇青石[Fe_3（PO_4）_2 8H_2O]。显微镜研究还表明，矿物样品中的大多数硫化物晶粒以释放的细颗粒（约10微米）或磁铁矿和赤铁矿晶粒中的夹杂物形式存在。 XRD研究表明，磁铁矿是主要矿物，其次为赤铁矿和黄铁矿，证实了微观发现。铜，镍和锌分别以矿物样品中的痕量形式主要以黄铜矿，黄铜矿和黄铜矿[[Zn，Mn，Fe）（Fe，Mn）_2O_4]存在。杂质会残留到沉淀物和HRD样品中。对三个含铁样品的化学分析表明，颗粒样品中的硫和磷超过了规格。由于在矿物和颗粒样品中均观察到释放出的黄铁矿和黄铜矿颗粒，因此磁性和浮选工艺路线应能有效去除硫化物，但要以铁损失为代价。所有三个样品中的高磷含量都表明存在一些磷酸盐，这些磷酸盐难以通过当前的浓缩工艺（磁选和浮选）去除。

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