Process Mineralogical Investigation Of SiJiaYing Iron Ore

Sijiaying iron ore is a super large red iron ore, which belongs to Anshan type of irondeposit, and now is under construction. The main composition in its superficial layer ishematite quartzite, and the deep layer gradually turns into magnetite quartzite. Thebeneficiation indexes fluctuate frequently since the plant went into operation onSeptember2007. The main reason is because of the variation of the ore properties, whichlead to the iron ore concentration going up and down, high intensity magnetic separatorstailings grade, and low metallic recovery.Samples from different open-pit mine sites are taken systematic study on elements,phase, minerals, texture, structure, granularity and so on have been conducted. Inaccordance to microscopic analysis for open-pit mine, the valuable minerals arehematite，martite, magnetite, half-martite and limonite; the gangue minerals are quartz,biotite, chlorite, feldspar, hornblende, carbonate mineral and so on. Martite, half-martiteand magnetite have regular crystal shapes. The main texture of hematite is xenomorphicgranular texture; most of the limonite fill in the middle of iron band, and have irregularcrystal. Banded and compacted blocky shapes are the main ore structures, and wrinklyshaped structure ore also exists. Substance compositions and embedded features of Sijiaying Iron Mine oxidized ore are systematically studied, and the ore can be classifiedinto three types, those easy to disintegrate and easy to selection, those easy to disintegrateand hard to beneficiate, and those hard to disintegrate and hard to beneficiate. Theblending tests have been carried out between the types of those easy to disintegrate andeasy to selection and those hard to disintegrate and hard to beneficiate, which are basedon the actual practice. The results show that when the proportion of typeⅢ ore is below36.3%, the technical index will be better. The result offers some bases for blending theores, stabilizing the production and using existing resource reasonably and efficiently bythe studies of this subject.