EngineeringEnvironmental EngineeringMining EngineeringMetallurgyMineral ProcessingResource RecoveryMine Water TreatmentNutrient RecoveryFluorination ProcessesOptimum TemperatureOre-forming Processes Of Rare Earth ElementsRecycling Of Mineral ResourcesTemperature OptimumX-ray Diffraction Analysis
A process for recovery of RE from Baotou rare earth concentrate was developed by fixing the fluorine and chlorinating RE with ammonium chloride in the ore. The optimum conditions were determined as follows: fixing the fluorine of the ore 80min with the MgO dosage m(ore)/m(MgO)=3∶1 at 600℃; chlorinating the fixed fluorine calcine 80min, with NH4Cl dosage m(NH4Cl)/m(ore)=2∶1 at 500℃. The RE recovery reaches 85% under optimum conditions. The products of fixing fluorine with MgO were determined by X-ray diffraction, and the mechanism of fixing fluorine was also discussed.