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针对苍山含铁较低的贫磁铁矿,开展了预先抛废技术,使矿石磁性铁品位富集,再利用阶段磨矿、粗磨抛尾及粗磨提精工艺,回收苍山贫磁铁矿中的铁,从而形成了难处理铁矿中铁的回收工艺,以达到提质降耗、实现贫磁铁矿中铁综合回收的目的。采用两个方案进行了选矿试验,分别为:干式磁选-粗粒湿式磁选-阶段磨矿-弱磁选、干式磁选-粗粒湿式磁选-磨矿-弱磁选-细筛-筛上再磨再选。原矿经干式磁选与粗粒湿式磁选后可以获得产率为77.62%、铁品位36.20%的球磨给矿。该作业可以抛出产率22.38%、含铁13.40%的合格废石,全铁损失率9.65%,磁性铁损失仅1.88%,抛废效果明显。两个试验方案均可获得产率约为35%、铁品位约为65.6%、铁回收率约为74%的铁精矿。
In view of the low lean magnetite in Cangshan, a pre-abandonment technology was carried out to enrich the grade of magnetic iron ore, re-use the stage of grinding, coarse grinding and tailing, and coarse grinding and refining to recover Cangshan Lean Magnetite In the iron, which formed a refractory iron ore iron recovery process, in order to achieve quality and reduce consumption, to achieve the comprehensive recovery of lean magnetite iron purposes. The beneficiation tests were carried out by two schemes: dry magnetic separation - coarse wet magnetic separation - stage grinding - weak magnetic separation, dry magnetic separation - coarse wet magnetic separation - grinding - weak magnetic separation - fine Sieve - sieve and then grinding again. Raw ore by dry magnetic separation and coarse wet magnetic separation can obtain a yield of 77.62%, iron grade 36.20% of the ball mill to the mine. The operation can throw the qualified rate of 22.38% and 13.40% of iron, the loss rate of all-iron is 9.65%, the loss of magnetic iron is only 1.88%, and the rejecting effect is obvious. Both experimental schemes yield iron concentrates with a yield of about 35%, an iron grade of about 65.6% and an iron recovery of about 74%.