东鞍山微细粒铁矿选择性絮凝-强磁选技术研究

东鞍山铁矿石有用矿物嵌布粒度微细,强磁选作业回收率较低.本研究基于絮凝-磁选理论,开展强化细粒铁矿资源回收利用新技术研究.在研究赤铁矿和石英单矿物絮凝-沉降性能的基础上,通过絮凝-磁选试验考察了药剂种类及用量、矿浆pH值和搅拌转速等因素对微细粒铁矿絮凝-磁选行为的影响.结果表明:在适宜条件下,添加药剂可强化赤铁矿的絮凝...

Study on Selective Flocculation-High Gradient High Intensity Magnetic Separa-tion Technology in Donganshan Iron Ore

Donganshan iron ore has a fine disseminated grain size of useful minerals in it, so recovery of strong magnetic separation operations is low. This research is based on the theory of flocculation and separation to carry out research on new technologies for strengthening the recycling of fine-grained iron ore resources. On the basis of studying the sedimentation performance of hematite and quartz single minerals, the effects of the types and dosage of reagents, the pH value of the slurry, the stirring speed and other factors on the separation behavior of fine-grained iron ore were studied through flocculation-magnetic separation experiments. The results show that under suitable conditions, the addition of chemicals can help strengthen the flocculation of hematite and increase the sedimentation rate of hematite, but has little effect on the flocculation effect and sedimentation rate of quartz. With DLZ as the additive agent, under the conditions of stirring speed of 900 r/min, stirring time of 5 min, slurry pH of 10.0, and magnetic field strength of 0.9 T, 47.15% of the iron grade of magnetic separation concentrate and 71.24% of iron recovery can be obtained. Compared with the conventional magnetic separation process, the iron grade of the magnetic separation concentrate has decreased by 0.52%, the iron recovery has increased by 3.67%, and the beneficiation efficiency has increased by 1.54%.