Study on Process Mineralogy of a Hematite Ore in China
In order to provide a basis for the beneficiation test of a hematite ore in China,a process mineralogy study was carried out.The iron grade of the ore is 34.16%,the main useful iron mineral hematite content is 40.66%,and the secondary iron mineral limonite content is 9.90%.The ore texture mainly in-cludes block texture,disseminated texture and banded texture.The ore structure mainly includes needle structure,mesh structure,inclusion structure,granular structure,disseminated structure,porphyritic struc-ture and metasomatic structure.The hematite is mainly needle-like and fibrous aggregates symbiotically em-bedded with gangue minerals,with an embedded particle size of 5～30 μm.Limonite is mainly colloidal or porphyritic,and the disseminated particle size is less than 0.07 mm.The distribution rates of hematite and li-monite in the-0.01 mm fraction are 46.48%and 27.14%,respectively.This part of fine-grained iron miner-als is difficult to be dissociated completely.The dissemination size of quartz is uneven,and the distribution rate of-0.07 mm particle size is 53.91%.This part of quartz is clastic and fine-grained disseminated in iron minerals,which is hard to liberate from iron minerals.According to the analysis results,the stage grinding stage separation process is recommended.
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