某难选闪石型原生矿超细磨矿磁选工艺试验

Experimental Study on Ultra-fine Grinding Magnetic Separation Process of a Refractory Amphibole Primary Ore

某低品位闪石型原生矿具有磁性铁占比低、嵌布粒度极细、硅酸铁含量高等特点,导致选矿比大、成本高、精矿品位提升困难,为了对该类型铁矿石进行高效开发利用,在工艺矿物学性质研究的基础上,进行了详细的磨矿磁选条件试验研究。试验结果表明:采用细碎—干式抛尾—辊磨超细碎—湿式预选—粗精矿四段磨矿—四段弱磁选—淘洗磁选流程,获得了产率21.98%、TFe品位65.45%、铁回收率49.91%的铁精矿,为该闪石型磁铁矿资源的开发利用提供了技术依据。

A low-grade amphibole-type primary ore has the characteristics of low proportion of mag⁃netic iron,very fine dissemination size and high content of iron silicate,which leads to large beneficiation ratio,high cost and difficulty in improving concentrate grade.In order to develop and utilize this type of iron ore efficiently,based on the study of process mineralogy,a detailed experimental study on grinding magnet⁃ic separation conditions is carried out.The test results show that the iron concentrate with yield of 21.98%,TFe grade of 65.45%and iron recovery of 49.91%is obtained by using the process of fine crushing-dry tail⁃ings discarding-roller mill ultra-fine crushing-wet pre-concentration-rough concentrate four stage grind⁃ing-four stage low intensity magnetic separation-elutriation magnetic separation,which provides a technical basis for the development and utilization of the amphibole magnetite resources.