Journal
ULTRASONICS SONOCHEMISTRY
Volume 41, Issue -, Pages 156-162Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ultsonch.2017.09.028
Keywords
Rare earths; Leaching; MgSO4; Ultrasound leaching
Categories
Funding
- National Natural Science Foundation of China [51504116]
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The in situ leaching process of China's unique ion-adsorption rare earth ores has caused severe environmental damages due to the use of (NH4)(2)SO4 solution. This study reports that magnesium sulfate (MgSO4) as a leaching agent would replace (NH4)(2)SO4 by ultrasonically assisted leaching to deal with the ammonia-nitrogen pollution problem and enhance leaching process. At leaching conditions of 3 wt% MgSO4 concentration, 3:1 L/S ratio and 30 min, the total rare earth leaching efficiency reaches 75.5%. Ultrasound-assisted leaching experiments show that the leaching efficiency of rare earths is substantially increased by introducing ultrasound, and nearly completely leached out after two stage leaching process. Thus, ultrasonic-assisted leaching process with MgSO4 is not only effective but also environmentally friendly, and beneficial to leach rare earths at laboratory scale.
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