硫酸渣用磁化焙烧工艺分选铁精矿的研究与应用

Investigation and Application of Magnetization-Roasting Process for Iron Separation from Pyrite Cinder

对硫酸渣回收铁精矿的磁化焙烧工艺进行了试验研究,在焙烧温度800℃、焙烧时间15 min、掺碳量7%的条件下,磁化焙烧较为理想。经一段磨矿、3次磁选可获得精矿品位65.30%、回收率83.54%、产率67.60%的铁精矿。磁化焙烧工艺中试生产线取得了铁精矿品位64.71%、回收率86.85%、产率70.92%、硫含量0.23%的指标。每吨精矿加工成本110元左右,经济效益十分显著。

Investigation was made on the magnetization-roasting process for recovering iron from pyrite cinder.At a roasting temperature of 800 ℃,roasting time of 15 min,and carburizing rate of 7%,the magnetization effect was ideal.An iron concentrate grading 65.03% at a recovery of 83.54% and yield of 67.60% could be obtained by one-stage grinding and three stage magnetic separation.In the test production line adopting the magnetization-roasting process,an iron concentrate grading 64.71% at a recovery of 86.85% and yield of 70.92% and containing 0.23% sulfur was obtained.The per-ton processing cost of concentrate was about RMB 110,very obvious economic benefit.