Recovery of RE from Weishan Rare Earth Concentrate with Chlorination Roasting after Fluorine-fixing Treatment
微山稀土精矿经固氟后采用氯化铵法回收稀土

A process for recovery of RE from the Weishan rare earth concentrate was developed by incorporation of fluorine-fixing and RE concentrate chlorinating with ammonium chloride. The suitable conditions were determined as follows: Fluorine-fixing time of 50 min, MgO dosage mMgO/more=1:20 at 550oC. Chlorinating the fluorine-fixed calcine by 60 min, with NH4Cl dosage mNH4Cl/more=1.2:1 at 480oC, the leaching recovery of RE reaches 87.8% under the above conditions. The possible reactions in the fluorine-fixing process were discussed with the X-ray diffraction spectrum.