东鞍山铁矿强化细粒铁矿物回收新技术研究

Research on New Technology of Enhanced Separation Recovery of Fine-grained Iron Minerals in Donganshan Iron Mine

针对东鞍山烧结厂强磁选作业尾矿铁品位偏高,现有的强磁设备不能有效回收细粒铁矿物的问题,在强磁给矿样品工艺矿物学研究基础上,基于聚团分选理论,通过聚团强磁选试验详细考察了分散剂及淀粉用量、强磁分选参数等因素对微细粒铁矿强磁分选效果的影响,通过混磁精矿反浮选试验考察了选择性聚团预处理对反浮选分选指标的影响。聚团强磁选试验结果表明:在水玻璃用量为500 g/t、DLA用量为250 g/t,搅拌转速为900 r/min、搅拌时间为5 min、矿浆pH值为10.0、冲次为170次/min、矿浆流速为120 mL/s、磁选背景磁感应强度为1.0 T的条件下,可获得铁品位为47.65%、铁回收率为71.54%的磁选指标,与不添加药剂调浆相比,磁选作业铁回收率提高了4.58个百分点,选矿效率提高了2.42个百分点。混磁精矿反浮选试验结果表明:与常规高梯度强磁选—反浮选工艺相比,采用选择性聚团—高梯度强磁选—反浮选工艺最终获得的精矿品位变化不大,而混磁精矿铁回收率提高了2.05个百分点,最终浮选精矿铁回收率提高了4.37个百分点。

In order to solve the problem of the high grade of high intensity magnetic tailing in Donganshan,and the existing high intensity magnetic equipment cannot effectively recover fine iron ore.Based on the process mineralogy of samples and the theory of agglomeration separation,the effects of reagent dosage and magnetic separation parameters on the magnetic separation index were investigated through agglomeration-magnetic separation test,and the effects of selective agglomeration pretreatment on reverse flotation index were also investigated through reverse flotation test.The agglomeration-magnetic separation test results indicated that under the conditions of sodium silicate dosage of 500 g/t,DLA dosage of 250 g/t,stirring speed of 900 r/min,stirring time of 5 min,pulp pH value of 10.0,frequency of 170 times/min,pulp flow rate of 120 mL/s and magnetic separation background field strength of 1.0 T,the magnetic separation index with iron grade of 47.65%and iron recovery of 71.54%can be obtained.Compared with non-additive agent,the magnetic separation recovery was increased by 4.58 percentage points,and the beneficiation efficiency was increased by 2.42 percentage points.The reverse flotation test results of mixed magnetic concentrate show that:compared with the conventional high gradient high intensity magnetic separation reverse flotation process,the final concentrate grade obtained by selective agglomeration high gradient high intensity magnetic separation reverse flotation process has little change,while the iron recovery of mixed magnetic concentrate has increased by 2.05 percentage points,and the iron recovery of final flotation concentrate has increased by 4.37 percentage points.