Yunnan Bao Zipu Hematite Beneficiation Process

Hematite iron ore resources in China account for more than half of total reserves, Usually the ore content low iron, iron minerals disseminate fine grain size, which need to fine grinding to the basic dissociation, and mineral composition is complex, magnetic is weak, dressing is difficult. Hematite resource development in China and use of the building for domestic and foreign steel industry related industries provide a solid material foundation. With fewer and fewer resources of high-grade ore, the technology research of low-grade hematite mineral processing is more and more important.Dongchuan, Yunnan Bao Zipu hematite as the experimental study of this thesis content 38.10% iron, availability of iron minerals are hematite and limonite, in which the iron content of hematite is 77.8% of the iron content in the total iron, whose main gangue mineral is quartz. Harmful sulfur, arsenic content is lower, excessive phosphorus is the serious harmful element,91% of the phosphorus occurs in hematite and limonite, the use of mechanical methods is difficult to be elected.Test first we determined magnetic separation of ore pre-cast by gravity and concentrate-magnetic test, then do further reduce the phosphorus and the reduction rest to concentrate have been rough pre-selected, and mixed in proportion to the 200 mesh grinding fineness of 80% to the middlings after the pre-ore and dressed directly by intensity magnetic separation to achieve a better throwing tail effect of middlings. The relative recovery rate to the ore of the concentrates (Fe 57.11%) and middlings (Fe 49.67%) is 33.04%.After series of experiments on rough concentrate got by pre-selecting, two circuits are determined finally, that is high intensity magnetic separation-regrinding rough concentrate-magnetic separation and high intensity magnetic separation-regrinding rough concentrate-floatation circuit. Under regrinding fineness of 80%-74 u m, excitation current of 18A and magnetic matrices of 1/2 conditions, it could get a concentrate with Fe grade of 61.35%, recovery of 14.58% and second concentrate with Fe grade of 58.5% and relative recovery of 17.12%. And it also got a concentrate with Fe grade of 61.16% and recovery of 33.17% through flotation process in regrinding fineness of 80%-45μm, sodium carbonate for regulator of 1 kg/t, sodium silicate for dispersant of 200g/t, starch for depressant and flocculant agent of 4 kg/t and lurylamine for collector of 150 g/t situations. However the phosphorus grade of concentrate got by high intensity magnetic separation-regrinding rough concentrate-floatation circuit was higher than that got by high intensity magnetic separation-regrinding rough concentrate-magnetic separation circuit. A series of tests shows that it is still an important issue to research on this ores in future due to get better data and more reasonable technological process, meanwhile providing favorable experimental criterion for fine particle hematite processing.