关键词: 微细嵌布铁矿石, 磁赤铁矿, 磁铁矿, 粗磨抛尾, 粗精矿再磨精选, 中矿再磨再选

Abstract: A iron ore from Sichuan in China is sedimentary deposit containing 39.93% of iron.The major occurrence of iron ore is maghemite, accompanied with a small amount of magnetite.The disseminated grain size of iron minerals is ultra-fine, and iron minerals are associated closely with clay minerals such as chlorite in group.The full liberation of maghemite is extremely hard to be obtained and iron content in single minerals is lower.In order to provide the basis for the development of the iron ore resources, and on the basis of multi-program comparison, with the grinding fineness of -0.074 mm 55.37%, iron concentrate with the yield of 54.22%, Fe grade of 61.02%, and Fe recovery of 82.86% was obtained through the process of tailing discarding by one rounding and one scavenging, regrinding of rough concentrate to -0.074 mm 95.02% and then cleaning, regrinding of joint of scavenging concentrate and cleaning tailings to -0.045 mm 95.27% and then re-concentration.

Key words: Fine disseminated iron ore, Maghemite, Magnetite, Tailing discarding by primary grinding, Regrinding of rough concentrate, Regrinding and re-concentration of middling