Mineralogical and physical studies of low-grade tantalum-tin ores from selected areas of Rwanda
Mineralogical and physical studies of low-grade tantalum-tin ores from selected areas of Rwanda
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对卢旺达选定地区的低品位钽锡矿石进行矿物学和物理研究
DOI：
10.1016/j.rineng.2021.100248
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发表时间：
2021
影响因子：
5
通讯作者：
Onwualu, Azikiwe P.
中科院分区：
文献类型：
--
作者：
Habinshuti, Jean Baptiste;Munganyinka, Jeanne Pauline;Adetunji, Adelena R.;Mishra, Brajendra;Ofori-Sarpong, Grace;Komadja, Gbetoglo Charles;Tanvar, Himanshu;Mukiza, Janvier;Onwualu, Azikiwe P.
在这项工作中，使用各种技术对卢旺达恩通加和卡莫尼的低品位钽锡矿石样品进行了矿物学和物理特性分析。矿石中Ta_2O_5、Nb_2O_5含量均小于0.1%，放射性氧化物含量低于0.5%的临界值，属低品位无放射性矿石。通过电感耦合等离子体发射光谱法检测和定量的与钽相关的特征元素，并表示为天然存在的氧化物，包括Ta 2 O 5、Nb 2 O 5、Fe 2 O3、MnO、SnO 2、MgO、TiO 2、U3 O 8和ThO 2等。对原始样品的分析表明，存在有价值的矿物：铌铁矿（0.067%-0.469%）、铌铁矿（0.050%-0.062%）和铁铁矿（0.194%-0.769%）、钽铁矿（0.039%-0.063%）和锰铁矿（0.080%-0.186%）。粗选后，矿样得到的精矿成分为66.14%SnO2、7.66%Ta2O5和7.70%Nb2O5。这些矿物大多数粒径为125 μm，嵌布在伟晶岩的铝硅酸盐基质中。所有样品显示出几乎相似的矿物组成，XRD结果强烈支持这一观察结果，衍射图显示出相同的特征峰，主要与高岭石，白云母和石英矿物相匹配。钽铁矿、铌铁矿和钽铁矿的峰并不强烈和可见，但在浓缩后，它们变得清晰、尖锐和强烈。这些结果将作为选择和设计适当的处理技术，以有效地利用这种矿产资源的基线。
In this work, mineralogical and physical characterization of low-grade tantalum-tin ore-samples from Ntunga and Kamonyi of Rwanda were carried out using various techniques. The ore-samples were classified as low-grade and non-radioactive ores as they contained less than 0.1% Ta2O5and Nb2O5, and the percentage of radioactive oxides were below the critical value of 0.5%. The characteristic elements associated with tantalum as detected and quantified by Inductively Coupled Plasma-Optical Emission Spectroscopy and expressed as oxides for their natural occurrence included Ta2O5, Nb2O5, Fe2O3, MnO, SnO2, MgO, TiO2, U3O8, and ThO2, among others. Analysis of samples in raw form showed presence of valuable minerals of cassiterite (0.067%–0.469%), and columbite-(Fe) with Nb2O5(0.050%–0.062%) and Fe2O3(0.194%–0.769%), and tantalite-(Mn) with Ta2O5(0.039%–0.063%) and MnO (0.080%–0.186%). Upon a rough gravity concentration, the ore-samples resulted in concentrate with compositions of 66.14%SnO2, 7.66%Ta2O5and 7.70%Nb2O5. These minerals with most particle sizes of 125 μm were disseminated within the alumino-silicate matrix of the pegmatite rock. All samples showed nearly similar mineralogical compositions, and the XRD results strongly supported this observation, with diffractograms showing identical characteristic peaks which matched mainly with kaolinite, muscovite, and quartz minerals. Peaks of cassiterite, columbite and tantalite were not strong and visible but upon concentration, they became clear, sharp, and strong. These results will serve as a baseline for selecting and designing appropriate processing technique to effectively harness this mineral resource.
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DOI：
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影响因子：
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