白云鄂博混合原矿中有害元素的赋存状态研究

Study on the Occurrence State of Harmful Elements in the Bayan Obo Mixed raw Ore

采用主要化学成分分析、自动矿物分析系统、偏反光显微镜、场发射扫描电镜、能谱仪等手段对白云鄂博混合原矿中有害元素的化学成分、矿物组成、元素分布率以及矿物嵌布特征等方面进行研究。结果显示,白云鄂博混合原矿中有害元素的含量较高,P_2O_5为2.98%,F为8.89%,S为1.63%;混合原矿中的有害元素主要以独立矿物形式存在,包括萤石、氟碳铈矿、独居石和磷灰石、重晶石、黄铁矿等,而且元素分布率均高于93%;混合原矿中包含有害元素的矿物在矿区内分布极为广泛,形态产状多种多样,有用矿物粒度细小,矿物共生组合与接触关系复杂,对高质量产品的生产影响较大。研究结果为该矿石今后生产工艺改造升级提供理论研究基础。

The major chemical composition,mineral composition,element distribution rate and mineral dissemination features of harmful elements in the mixed raw ore of Bayan Obo were studied by means of multi-element chemical analysis,automatic mineral analysis system,partial reflection microscope,field emission scanning electron microscope and energy spectrometer.The results shows that the content of harmful elements in the Bayan Obo mixed raw ore is relatively high,with P2O52.98%,F 8.89%and S 1.63%respectively.The harmful elements in the mixed raw ore mainly exist in the form of independent minerals,including fluorite,bastnasite,monazite,apatite,barite,pyrite,etc.,and the element distribution rate is above 93%.The minerals containing harmful elements in the mixed raw ore are widely distributed in the mining area,with diverse morphology and occurrence,small size of useful minerals,complex symbiotic association and contact relationship of minerals,which has a great impact on the production of high-quality products.The research results provides a theoretical basis for the upgrading of the ore production process in the future.