关键词: 磁选尾矿, 再选, 螺旋柱

Abstract: Anshan Xiaolingzi iron ore belongs to the sedimentary metamorphic iron deposits with characteristics of fine iron minerals and low magnetic rate, and it is a refractory iron ore.After re-concentration of tailings from magnetic separation, more than 65% of iron concentrate grade and a higher recovery rate were obtained.So a breakthrough and innovation in process technology are required.The new re-concentration process which did not adopt the traditional disc magnetic separator but the “rinse water” medium intensity magnetic separator at pre-concentration stage can greatly improve the Fe grade and recovery.This new process gave up the technical line of entirely depending on the monomer dissociation degree of iron minerals and adopted the spiral columns to show its high productivity advantages.Obtaining high quality concentrate under coarse particle size can not only reduce grinding stage and separation times, but also improve the follow-up operation condition.Hence, the traditional magnetic separation process has been further optimized.

Key words: Tailings after magnetic separation, Re-concentration, Spiral column