关键词: 含铁矿废石, 预选, 阶段磨矿阶段磁选, 浮选

Abstract: Aiming at the problems of large volume，low iron grade，fine disseminated，difficult to be separated，process of pre-separation-stage grinding stage magnetic separation magnetic separation-anionic reverse flotation process was put forward on iron waste rock from Sijiaying of Hebei Province.Results show that waste rock with iron grade of 18.79% via discarding by permanent magnet dry magnetic separator-middle and fine wet high gradient high intensity magnetic separator separation，pre-concentrate with iron grade of 29.25% and recovery of 59.61% was obtained，pre-concentrate via two stage grinding stage magnetic separation operation，magnetic mixed concentrate with iron grade of 52.71% and recovery of 48.50% was obtained，using NaOH as pH regulator，starch as depressor，CaO as activator，MF as reverse flotation collector，via one roughing-one cleaning-two scavenging reverse flotation，qualified concentrate with iron grade of 65.97%，yield recovery of 89.21%，the ore recovery rate is 43.27% was obtained，can provide reference for the recycle of the waste rock resources.

Key words: Waste rocks containing iron, Pre-concentration, Stage grinding stage magnetic separation, Flotation