三产品永磁立式精选机的研制与应用试验

Development and Application of Vertical Permanent Magnetic Separator for Cleaning with Three Products

针对传统湿式弱磁选机所存在的磁性夹杂和机械夹杂问题,研制了一种三产品永磁立式精选机。该机主要由上部给矿系统,立式外筒,带旋转磁系的立式弱磁内筒,立于内外筒之间、筛面垂直于圆筒表面的格筛,位于外筒上部的溢流槽,位于外筒下部的反冲洗水管、中矿排放口、精矿排放口,机架,传动与控制系统等组成,其分选原理是:在旋转磁系的作用下,处于内外筒之间分选区内的物料将进行离心圆周运动,磁性夹杂和机械夹杂的聚团在撞击格筛时被打散,磁铁矿单体颗粒在磁力和重力的作用下朝磁系方向运动并逐渐进入精矿槽,连生体颗粒在离心力和重力的作用下背离磁系方向运动并逐渐进入中矿槽,非磁性脉石颗粒在反冲洗水的作用下进入溢流槽成为尾矿。采用该机对南芬选矿厂铁品位为65.35%的磁选柱给矿进行精选试验,所获最终铁精矿的铁品位达68.78%,与现场所用磁选柱所获最终铁精矿的铁品位相当,同时可获得作业产率为10.89%、铁品位为49.08%的中矿和作业产率为2.97%、铁品位为25.54%的尾矿。试验结果说明三产品永磁立式精选机的设计思路是可行的,但尾矿铁品位偏高,需要通过进一步研究加以改进。

Aiming at the magnetic and mechanical inclusions existing in the traditional wet low intensity magnetic separa-tor,a vertical permanent magnetic separator with three products is developed. The machine is mainly composed of the upper feeding system,outer vertical tube,vertical weak magnetic inner drum with rotating magnetic system,the grizzly setting between outer and inner cylinder,the surface of which is perpendicular to the cylinder surface,overflow tank located in the upper part of the outer barrel,back-wash water pipe and outlet discharge of both middlings and concentrate located at the bottom of outer barrel,racks,drive system,and control system i. e. Its separation principle is：with the effect of rotating magnetic system,mate-rials in sorting area,between outer and inner cylinder,will conduct centrifugal circular motion,polyethylene formed by magnetic or mechanical inclusions will be scattered when impacting with the grizzly. Single magnetite particles move to the magnetic sys-tem and gradually enter into the concentration tank with the impact of magnetism and gravity. Locked particles move departure the magnet system and gradually into the middlings slot with the impact of centrifugal and gravity force. Nonmagnetic gangue particles flow into the overflow tank as tailings with the impact of back-washing water. Cleaning tests were conducted on the feeding of magnetic column in Nanfen Dressing Plant with 65. 35% iron. Iron grade of final iron concentrate obtained is 68. 78%,fairly with the concentrate gained from the on-site magnetic column,at the same time,middlings with yield of 10. 86%and iron grade of 49. 08% and tailings with yield of 2. 97% and iron grade of 25. 54% are achieved. The results indicate that, the design principle of vertical permanent magnetic separator for cleaning with three products is feasible,but the Fe grade of tailing is a bit higher. Further research and improvement should be continued.