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Distribution, Separation and Characterisation of Valuable Heavy Minerals from the Brahmaputra River Basin, Kurigram District, Bangladesh
Minerals ( IF 2.5 ) Pub Date : 2021-07-20 , DOI: 10.3390/min11070786
Aminur Rahman , Mark I. Pownceby , James Tardio , Graham J. Sparrow , Nawshad Haque , Fuad Hasan

Bangladesh’s heavy minerals deposits in river systems remain largely unexplored with past research restricted to beach placer deposits along the south-eastern coastline of the country. In this study, 64 samples were collected from stable sand bars from the northern Brahmaputra River. The average total heavy minerals (THM) from all sample sites was 10.73 wt%, with the THM concentrations generally highest at the outermost edges of the river and lowest within the mid-channel regions. There was no variation in THM content from north (upstream) to south (downstream). Valuable heavy minerals (VHMs) magnetite, ilmenite, garnet and zircon made up around 25–30 wt% of the THM content, with other heavy minerals including amphibole, pyroxene, kyanite, sillimanite, monazite, apatite and xenotime making up the remaining 70–75 wt%. A VHM distribution map showed that the upstream division of the studied area appeared to be the most prospective for valuable heavy minerals. A bench scale heavy mineral sands beneficiation flowsheet involving unit processes employing gravity, magnetic and electrostatic properties was designed and based on a detailed characterisation and phase analysis of the resulting fractions, it was determined that VHMs made up ~2 wt% of the material recovered. Of these, garnet and ilmenite made up the bulk of the VHMs at levels of 0.88 and 0.51 wt%, respectively, with recoveries of >83%. Characterisation of the concentrates showed that further refinement of the processing conditions is required to generate concentrates that are potentially suitable for commercial applications.

中文翻译:

孟加拉国库里格拉姆区布拉马普特拉河流域有价值重矿物的分布、分离和表征

孟加拉国河流系统中的重矿物矿床在很大程度上仍未被勘探,过去的研究仅限于该国东南海岸线的海滩砂矿矿床。在这项研究中,从雅鲁藏布江北部的稳定沙洲收集了 64 个样品。来自所有样本点的平均总重矿物 (THM) 为 10.73 wt%,其中 THM 浓度通常在河流最外缘最高,在河道中部地区最低。从北(上游)到南(下游),THM 含量没有变化。有价值的重矿物 (VHMs) 磁铁矿、钛铁矿、石榴石和锆石约占 THM 含量的 25-30%,其他重矿物包括角闪石、辉石、蓝晶石、硅线石、独居石、磷灰石和磷钇矿占剩余的 70- 75 重量%。VHM 分布图显示,研究区域的上游分区似乎最有可能发现有价值的重矿物。设计了涉及采用重力、磁性和静电特性的单元工艺的小规模重矿砂选矿流程,并基于对所得馏分的详细表征和相分析,确定 VHM 占回收材料的约 2 wt%。其中,石榴石和钛铁矿分别占 VHM 的 0.88 和 0.51 重量%,回收率 > 83%。浓缩物的表征表明,需要进一步改进加工条件以产生可能适用于商业应用的浓缩物。
更新日期:2021-07-20
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