摘要
白云鄂博云母型铁矿石中TFe品位为17.48%,稀土REO品位为2.46%。矿石中矿物组成复杂,含铁矿物主要是磁铁矿和赤铁矿,含有少量铌铁矿、黄铁矿等,稀土矿物以氟碳铈矿和独居石为主。矿石构造主要由黑云母定向排列而成的片状构造、斑杂状构造及浸染状构造;矿物主要为自形-半自形粒状结构、他形粒状结构、尖角状结构、交代残余结构、细脉状结构。磁铁矿多呈半自形至他形粒状变晶结构形式出现,部分呈角砾状集合体与云母共生;赤铁矿多呈半自形和他型粒状结构,也有部分赤铁矿呈微细粒粒状嵌布在脉石矿物中;氟碳铈矿和独居石呈粒状,与周边其它矿物紧密共生、镶嵌关系复杂。磁铁矿和赤铁矿的嵌布粒度不均,氟碳铈矿和独居石的嵌布粒度较细,部分细粒铁矿石和稀土矿物嵌布在脉石矿物中,部分铁矿石中也含有细粒稀土矿物。磨矿细度-0.074 mm占90%下磁铁矿、赤铁矿、氟碳铈矿和独居石的单体解离度仅为51.54%、58.36%、52.27%和63.64%。因此,强化矿石细磨和微细粒高效分选是解决精矿品位和回收率低的有效途径。
The grade of TFe and REO in Bayan Obo mica type iron ore is 17.48%and 2.46%,respectively.The mineral composition of the ore is complex.The iron minerals are mainly magnetite and hematite,with a small amount of niobium,pyrite,etc.The rare-earth minerals are mainly bastnaesite and monazite.The ore structure is mainly composed of schistose structure,patchy structure and disseminated structure formed by directional arrangement of biotite.The minerals are mainly automorphic and semi automorphic granular structure,allomorphic granular structure,angular structure,metasomatic residual structure and veinlet structure.The magnetite is mostly in the form of semi automorphic to allomorphic granular crystalloblastic structure,some of which are in the form of breccia aggregate and mica.The hematite is mostly in the form of half automorphic and other granular structure,and some of hematite is embedded in gangue minerals in the form of fine grains.The bastnaesite and monazite are granular,which are closely associated with other surrounding minerals and have complex inlaying relationship.The distribution granularity of magnetite and hematite is uneven.The distribution granularity of bastnaesite and monazite is finer.Some fine-grained iron ores and rare-earth minerals are embedded in gangue minerals.Some iron ores also contain fine-grained rare-earth minerals.When the grinding fineness of-0.074 mm accounts for 90%,the monomer dissociation of magnetite,hematite,bastnaesite and monazite is only 51.54%,58.36%,52.27%and 63.64%,respectively.Therefore,it is an effective way to solve the problem of low concentrate grade and recovery rate by strengthening fine grinding and high efficiency separation of fine particles.
作者
王维维
李二斗
候少春
郭春雷
WANG Weiwei;LI Erdou;HOU Shaochun;GUO Chunlei(Baotou Research Institute of Rare Earths, State Key Laboratory of Bayan Obo Rare Earth Resource Researches and Comprehensive Utilization, Baotou 014030, China;National Engineering Research Centre of Rare Earth Metallurgy and Functional Materials Co., Ltd, Baotou 014030, China)
出处
《矿产保护与利用》
2020年第5期44-48,共5页
Conservation and Utilization of Mineral Resources
基金
内蒙古自然科学基金(2020MS05001)
内蒙古自然基金重大专项(2019ZD11)。
关键词
白云鄂博矿
云母型
铁
稀土
赋存状态
Bayan Obo
mica type
iron
rare earth
occurrence state
