MAGNETIC ROASTING-MAGNETIC SEPARATION TESTS ON RECOVERING IRON FROM TAILINGS OF BAOGANG DRESSING PLANT

There are a large amount of useful resources such as iron,rare earth,niobium in the tailings of Baogang Dressing Plant,however,the iron content is just approximately 16.1%and exists as hematite.Magnetic roasting followed by magnetic separation is an effective way to recover iron from the tailings.Test results of magnetic roasting and magnetic separation show that the optimal roasting conditions are:dosage of reducing agent 8%,temperature 700 ℃ and roasting time 60 min,the roasted ore is then ground to 86%passing 0.045 mm.The optimal magnetic intensity is 111.5 kA/m.On the basis of these results,a processing test of magnetic roasting—grinding roughing—cleaning is carried out,and a final concentrate with iron content 63.49%,iron recovery 67.05%can be obtained.To provide reference for similar tailings comprehensive utilization.