Abstract: There are 22.39% iron in specularite tailing from Gansu.Iron mainly exists in form of specularite,and then siderite.In order to provide technical basis for comprehensive utilization of the tailing,the process of magnetizing roast-low intensity magnetic separation was carried out with half coking coal produced by a coking plant in Gansu Province as reductant.The results indicated that: with coal fines to raw tailings mass ratio of 1.5%,roasting at 750 ℃ for 60 min,most of specularite and siderite in tailings were converted to magnetite.With the roast product grinding at 87.36% passing 0.074 mm,and through the process of one rough low intensity magnetic separation,one scavenging low intensity magnetic separation,and mixed rough concentrate screened by 0.045 mm size,one cleaning low intensity magnetic separation for underflows,and concentrate mixed with the overflows,the iron concentrate with iron grade of 54.57% and recovery of 78.97% was achieved finally.

Key words: Specularite tailing, Magnetizing roast, Low intensity magnetic separation, Rough concentrate screening