用旋流-静态微泡浮选柱反浮选磁选铁精矿

用旋流-静态微泡浮选柱和浮选机对某铁矿选厂含铁42.00%的低品位混合磁选铁精矿进行了提高精矿品位的反浮选对比小型试验，结果表明，同样是1次粗选，浮选柱精矿品位达67%左右，比浮选机高约3个百分点，但尾矿品位也较高。为此，对浮选柱进行了增设脉动磁系和稳流管的改进。改进后的浮选柱不仅保持了精矿品位高的优势，而且尾矿品位大幅度降低，1次粗选可使精矿品位达到67.85%，回收率为79.22%，而浮选机需经过一粗一精一扫3次选别才能获得与此相近的指标。

Reverse Flotation of the Iron Concentrate from Magnetic Separation by Cyclonic Static Micro-bubble Flotation Column

Comparative laboratory tests of reverse flotation were carried out on improving the 42.00% low grade mixed iron concentrate from magnetic separation of an iron concentrator by cyclonic static micro-bubble flotation column. The results showed that by one roughing, the concentrate grade of the flotation column was about 67%, three percentage points higher than that of flotation cell. However, the tailing had also a higher grade. For this, improvement was made on the flotation column by adding a pulsating magnetic system and flow-stabilizing pipe. The improved flotation column not only keeps the advantage of high concentrate grade but can greatly reduce the tailing grade. One roughing can obtain a concentrate grading 67.85% at a recovery of 79.22%. To achieve the similar indexes, the flotation cell needs one coughing, one cleaning and three scavengings.