钛铁矿粗精矿直接还原分离钛铁试验研究

Experimental Study on Separation and Recovery of Iron and Titanium from Ilmenite Rough Concentrate by Direct Reduction

通过直接还原焙烧⁃磁选工艺对钛铁矿粗精矿进行铁、钛分离回收利用,采用单因素实验研究了还原温度、还原时间、煤粉用量、硼砂用量、膨润土用量、磨矿细度、磁场强度对铁精矿和钛精矿品位、回收率的影响,确定了适宜的工艺参数。结果表明,在还原温度1200℃、还原时间2 h、煤粉用量40%、硼砂用量2%、膨润土用量2%、磨矿细度-38μm粒级占84%、磁选磁场强度79.62 kA/m时,采用直接还原焙烧⁃磁选工艺可获得铁品位82.57%、铁回收率83.59%的铁精矿和钛品位49.23%、钛回收率85.18%的钛精矿,选冶指标理想。

A process consisting of direct reduction roasting and magnetic separation was adopted to separate and recover iron and titanium from ilmenite rough concentrate.A single factor experiment was conducted to explore effects of several factors,including reduction temperature,reduction time,coal powder dosage,borax dosage,bentonite dosage,grinding fineness,and magnetic field intensity,on the grades and recovery of iron concentrate and titanium concentrate.Then,the optimal processing parameters were finally determined.A reduction roasting runs at 1200℃for 2 h by adding coal powder at an amount of 40%,borax at 2%and bentonite at 2%,with a grinding fineness of 84%-38μm,followed by a magnetic separation with field intensity of 79.62 kA/m,resulting in an iron concentrate grading 82.57%Fe at 83.59%recovery,and a titanium concentrate approaching 49.23%Ti grade at 85.18%recovery.It is shown that good beneficiation and smelting indicators are obtained.