Hydrochloric Acid Leaching of Rare Earth from REO-SiO2-Al2O3 Slag
Received:January 20, 2017  Revised:January 20, 2017
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DOI:doi:10.3969/j.issn.1007-7545.2017.06.008
KeyWord:REO-SiO2-Al2O3-FeO-B2O3; rare earth; leaching; hydrochloric acid
           
AuthorInstitution
Jiang yin-ju 内蒙古科技大学 材料与冶金学院
Deng Yong-chun 内蒙古科技大学 材料与冶金学院
Wang Yong-qiang 内蒙古科技大学 材料与冶金学院
Xin Wen-bin 内蒙古科技大学 材料与冶金学院
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Abstract:
      Effects of hydrochloric acid dosage, temperature, and time on leaching rate of rare earth (RE) were investigated applying REO-SiO2-Al2O3-FeO-B2O3 multicomponent slag recovered from NdFeB scrap as raw material. Comparative experiments were conducted at low temperature-atmospheric pressure (LTAP) and high temperature-high pressure (HTHP) respectively. Leaching rate of RE of LTAP is 96% under the optimum conditions including dosage of hydrochloric acid of 1.45 times of theoretical amount, temperature of 85 ℃, and time of 60 min. Leaching rate of RE of HTHP is 98% under the optimum conditions including dosage of hydrochloric acid of 1.05 times of theoretical amount, temperature of 110~120 ℃, and time of 30 min. Compared with LTAP, HTHP consumes less hydrochloric acid and takes shorter time to obtain the same level of leaching rate of RE.
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