Recovery of RE from Baotou rare earth concentrate with chlorination roasting
(1. Institute of Nuclear Energy Technology,
Tsinghua University, Beijing 102201， China;
2. Chemistry Department, Zhumadian Teacher＇s College, Zhumadian 463000, China;
3. Department of Chemistry and Chemical Engineering,
Yueyang Normal University, Yueyang 414000, China)
Tsinghua University, Beijing 102201， China;
2. Chemistry Department, Zhumadian Teacher＇s College, Zhumadian 463000, China;
3. Department of Chemistry and Chemical Engineering,
Yueyang Normal University, Yueyang 414000, China)
Abstract: 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 dosagem(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.
Key words: rare earth concentrate; fixing fluorine; chlorinating; rare earth