关键词: 铁矿石, 嵌布特征, 解离度, 工艺矿物学

Abstract: China's domestic iron ore resources cannot meet the market demand， and a large amount of iron ore is imported from Mongolia. In order to realize the rational development and utilization of this ore， comprehensive detection methods such as chemical analysis， phase analysis， XRD analysis and scanning electron microscopy are adopted to conduct systematic technological mineralogy research on this ore. The results show that iron grade is 45.53%， copper can be recovered synthetically and the content of impurity sulphur is high. The main iron-bearing ore is magnetite and a small amount of hematite. The other metallic minerals are mainly pyrite， and small amount of chalcopyrite， a small amount of covellite， digenite， chalcopyrite， and rutile， etc. The ore structure is mainly block structure， disseminated structure， followed by reticulate and striate structure. The ore is mainly composed of semi-automorphic granular texture， metasomatic residual texture， pseudomorphic texture， crushing texture and idiomorphic crystal texture. The magnetite is mostly semi-automorphic granular grain and its aggregation are distributed in the gangue mineral. In the aggregate， the gangue mineral is granular or fine-veined along the gap of magnetite grains. The destributed grain size of magnetite is mainly medium grain， and the distribution rate of coarse grain， medium grain and fine grain is 32.43%， 39.63% and 27.03%， respectively. The results of monomer dissociation statistics of magnetite under different grinding fineness show that most magnetite is easy to be liberatured and magnetite is easy to be recycled. According to the properties of ore， the technology process of coarse grinding， magnetic separation and tailings casting， regrinding and then removing sulfur， silicon and other impurities is proposed. The test results can provide technical basis for rational exploitation and utilization of the ore.

Key words: Iron ore, Dissemination characteristics, Liberation degree, Process mineralogy