白云鄂博东矿白云石型矿石特征分析

Analysis on Characteristics of Dolomite Type Ore in East Mine of Bayan Obo

白云鄂博超大型铌、稀土、铁矿床是目前世界上发现新矿物种类最多的矿区之一。白云石型铌稀土矿石是本区分布最为广泛的一种矿石类型,对其开展矿物学等特征研究具有重要的意义。通过野外工作采集白云鄂博东矿白云石型矿石,并进行岩相学鉴定以及工艺矿物学分析。结果表明:白云石以半自形—他形粒状分布于萤石之间,颗粒大小均匀,粒径一般为0.1~0.3 mm;磁铁矿多以半自形集合体浸染状分布于萤石以及白云石之间,颗粒大小一般为0.3~1.0 mm。矿石主要氧化物是CaO和MgO,白云石在该类型矿石中含量可高达70%。

The super large deposit of Nb, rare earth and iron in Bayan Obo is currently one of the mines with the most varieties of new minerals discovered in the world. The dolomite type ore with Nb and rare earth is the most widely distributed ore type in this area as well as it is with significant meanings to research its characteristics such as mineralogy. The dolomite type ore in East Mine of Bayan Obo is collected through field work as well as the petrographic identification and process mineralogy analysis are carried out. The results showed that the dolomite was distributed in subidiomorphic-xenomorphic granular form among fluorite, its particle size was uniform and generally 0.1~0.3 mm;the magnetite was mostly disseminated in subidiomorphic aggregation among fluorite and dolomite and its particle size was generally 0.3~1.0 mm. The main oxides of ore are CaO and MgO as well as the content of dolomite in this type of ore could reach 70%.