某低品位铌矿石工艺矿物学特征及可选性研究

Study on process mineralogical characteristics and processability of a certain low grade niobium ore

通过对某低品位铌矿石进行详细的工艺矿物学研究,发现该矿石结构复杂,主要为斑状结构和粗面结构,特点是岩石由长石和辉石微晶组成,金属矿物与脉石矿物间交织共存,并存在互为包裹体的形态;有价元素铌未见独立矿物,分散存在于辉石、长石、磁铁矿、角闪石等矿物中;辉石是选矿回收铌的主体矿物。选矿试验最终确定推荐“磁选预富集—粗精矿浸出”联合流程提取矿石中的有价元素铌;流程可获得浸出液产品含铌87.44 mg/L,铌的选冶回收率为63.12%。

Through the detailed process mineralogical study of a certain low grade niobium ore,it can be found that the ore has complex structure,dominated by porphyritic structure and trachytic texture.It has such characteristics that the rock is composed of feldspar and pyroxene microlite;metal minerals and gangue minerals coexist and are mutually inclusive;the valuable element niobium is not found as an independent mineral but dispersed in pyroxene,feldspar,magnetite,amphibole,etc.;pyroxene is the main mineral for niobium recovery.Through beneficiation tests,the combined process of“magnetic separation for pre-concentration-rough concentrate leaching”was recommended for extracting the valuable element niobium from the ore;The leachate containing 87.44 mg/L niobium can be obtained from this process and the recovery rate of niobium is 63.12%.