摘要
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。
The beneficiation of cangsha with low iron grade was investigated in the present paper. Waste pre-discarding was adopted to increase the magnetite iron grade. Stage grinding and magnetic separation were used subsequently. Recovery processes were developed for the beneficiation of refractory ores, which could achieve the aims of upgrading, reducing cost and the comprehensive recovery of iron from lean magnetite iron ores. Two technical routes were adopted to carry on the beneficiation experiments. Route 1 included dry magnetic separation, corase-grained wet magnetic separation, stage grinding and low intensity magnetic separation. Route 2 included dry magnetic separation, corase-grained wet magnetic separation, grinding, low intensity magnetic separation, sieving, grinding and separation of oversize particles. The productive rate and iron grade of ball-milling feedings were 77.62% and 36.20%, respectively, after dry magnetic separation and corase-grained wet magnetic separation of raw ores. The productive rate and iron grade of qualified waste were 22.38% and 13.40%, respectively, and only 9.65% total iron and 1.88% magnetic iron were lost during the magnetic separation process. The effect of waste discarding is very significant. Iron ore concentrates could be obtained by the two technical routes. The productive rate, grade of iron ore concentrates and recovery rate of iron were about 35%, 65.6% and 74%, respectively.
出处
《计算机与应用化学》
CAS
2017年第3期188-194,共7页
Computers and Applied Chemistry
基金
国家高技术研究发展计划(863)资助项目(2011AA06A104)
关键词
苍山铁矿
选矿
铁精矿
cangshan iron ores
beneftciation
iron ore concentrates
