氯化铵焙烧法从混合型稀土精矿中回收稀土

Recovery of Re from Rare Earth Concentrate with Ammonium Chloride Roasting

用氯化铵焙烧法分解包头混合型稀土精矿回收稀土 .实验确定了矿物固氟和氯化焙烧的最佳条件 :固氟温度为 6 0 0℃ ,固氟剂用量为m(ore) /m(MgO) =3∶1,固氟时间 80min ;氯化剂用量为m (NH4 Cl) /m(ore) =2∶1,氯化焙烧温度 5 0 0℃ ,氯化时间 80min .在优化条件下 ,稀土的回收率在 85 %以上 .

A process of recovery of RE from the Baotou rare earth concentrate was developed by fixing the fluorine and chlorinating the RE with ammonium chloride in the ore. The optimum conditions were determined as follows: fixing the fluorine of the ore 80 min, with the MgO dosage m(ore)/m(MgO)=3∶1 at 600℃; chlorinating the fixed fluorine calcine 80 min. With NH 4Cl dosage m(NH 4Cl)/m(ore)=2∶1 at 500℃, the RE recovery reaches 85% at optimum condition.