某菱锰矿石工艺矿物学研究

某低品位难选锰矿石中有用矿物为菱锰矿，锰品位为14.50%。为给该矿石选矿工艺流程制定提供依据，通过光学显微镜、化学分析、X射线衍射等分析手段，对矿石化学成分、矿物组成及嵌布特征等进行了系统研究。结果表明，矿石中主要含锰矿物为菱锰矿、水锰矿、硬锰矿，其中菱锰矿含量为19.17%；脉石矿物主要有石英、白云石和绢云母等，其中石英含量达32.05%。矿石主要呈薄层状构造、片状构造、块状构造、条带状构造和浸染状构造分布；矿石中矿物的结构主要有自形半自形晶结构、他形晶结构、填隙结构等。菱锰矿主要以自形半自形粒状及粒状集合体产出，与石英、白云母、绿泥石等相互嵌布。石英主要以自形半自形粒状产出，粒度细小，与菱锰矿、白云石、绿泥石、白云母相互嵌布。白云石多以细小粒状及粒状集合体产出，与石英、白云母相互嵌布。菱锰矿的嵌布粒度呈两极分化，且在细粒级中分布率较高。研究结果对矿石分选工艺流程的制定具有指导意义，可以为该类难处理锰矿石的开发利用提供借鉴。

Research on Process Mineralogy of a Carbonaceous Rhodochrosite Ore

The useful mineral in a low-grade refractory manganese ore is rhodochrosite， and the manganese grade is 14.50%. In order to provide technique basis for the beneficiation of the ore， the chemical composition， mineral composition and embedding characteristics of the ore were systematically studied by means of optical microscopy， chemical analysis and X-ray diffraction. The results show that the main manganese-bearing minerals in the ore are rhodochrosite， manganite and pyrolusite， of which the content of rhodochrosite is 19.17%； the gangue minerals are mainly quartz， dolomite and sericite， among which the quartz content is 32.05%. The structure characterize of the ore is mainly thin layer structure， flaky structure， massive structure， strip structure and disseminated structure； the structure of minerals in ore is mainly characterized by self-form and semi-self， crystal structure， and the interstitial structure carbonate mineral. The rhodochrosite is mainly occurrences in automorphic， semi-automorphic granular and granular aggregates. Rhodochrosite is produced by fine granular and granular aggregates， interwoven with quartz and muscovite. Quartz is mainly occurrences in the form of automorphic， semi-automorphic with granules in small grain size， intercalated with rhodochrosite， dolomite， chlorite and muscovite.. Dolomite is mainly occurrences in fine granule and granular aggregate， embedded with quartz and mica. The size of the inlaid grain of rhodochrosite is polarized and the distribution rate is higher in the fine fraction. The research results have guiding significance for the formulation of ore sorting process， which can provide reference for the development and utilization of such refractory manganese ore.