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Mineralogical, geochemical, and processing characteristics of heavy minerals sand deposits of Bangladesh and their commercial aspects

机译：孟加拉国重型矿物砂矿床的矿物学，地球化学和加工特性及其商业方面

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摘要

Systematic exploration in the southeastern coastal belt of Bangladesh for heavy minerals has resulted in the discovery of a number of heavy mineral sand (HMS) deposits in the coastal beaches and offshore islands. The mineralogical, geochemical, and mineral processing characteristics of the heavy mineral sands and their economic potential are presented in this paper. The HMS deposits contain on average 23% total heavy minerals (THM). Heavy mineral sand deposits together contain 1.76 Mt of economically important heavy minerals, comprising ilmenite (1.025 Mt), garnet (223 kt), zircon (158 kt), leucoxene (97 kt), kyanite (91 kt), rutile (70 kt, magnetite (81 kt), and monazite (17 kt). In the heavy fraction the average economic minerals content is zircon 4.20%, rutile 2.04%, ilmenite 26.03%, garnet 6.45%, kyanite 3.92%, leucoxene 2.30%, magnetite 1.87%, and monazite 0.31%. A large deposit of economic heavy minerals has been reported recently in the Bay of Bengal islands in the Bhola and Patuakhali districts and in the river sand bars of the Brahmaputra. Processing of bulk samples has been carried out at the pilot plant of BAEC at Cox's Bazar to test the separation characteristics of individual heavy minerals using gravity, magnetic, and electrostatic separation. Geochemical studies on separated minerals show that the TiO_2 content in rutile is around 90% and ZrO_2 in zircon is around 65%, which are quite satisfactory in respect of commercial grade. The ilmenite contains a low level of titanium dioxide (around 43%) and higher levels of chromium, manganese, and iron. Beneficiation and upgrading will be required to make the ilmenite a marketable commodity.
机译：孟加拉国东南沿海腰带为重型矿产的系统勘探导致了许多重型矿物沙（HMS）沉积物在沿海海滩和近海岛屿。本文提出了重型矿物砂的矿物学，地球化学和矿物加工特性及其经济潜力。 HMS沉积物平均含有23％的总重矿物（THM）。重型矿物砂沉积在一起含有1.76亿吨经济上重要的重型矿物质，包括ilmenite（1.025mt），石榴石（223 kt），锆石（158 kt），白昔氧乙烯（97 kt），kyanite（91 kt），金红石（70 kt，磁铁矿（81 kt）和monazite（17 kt）。在沉重的零件中，普通经济矿物质含量为锆石4.20％，金红石2.04％，石榴石6.45％，kyanite 3.92％，白氧酮2.30％，磁铁矿1.87％和Monazite 0.31％。最近在Bhhea和Patuakhali区的孟加拉群岛海湾和Brahmaputra的河砂杆上举行了大量经济重型矿物存款。在飞行员中进行了散装样品的加工BAEC植物在Cox的Bazar使用重力，磁性和静电分离测试各个重矿物的分离特性。分离矿物的地球化学研究表明金红石中的TiO_2含量约为90％，锆石ZrO_2约为65％，约为65％我很令人满意n尊重商业级。 Ilmenite含有低水平的二氧化钛（约43％）和更高水平的铬，锰和铁。将需要私人和升级来使Ilmenite成为可销售商品。

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