Ultrasound-assisted leaching of rare earths from the weathered crust elution-deposited ore using magnesium sulfate without ammonia-nitrogen pollution.

Author(s) Yin, S.; Pei, J.; Jiang, F.; Li, S.; Peng, J.; Zhang, L.; Ju, S.; Srinivasakannan, C.
Journal Ultrason Sonochem
Date Published 2018 Mar
Abstract

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)2SO4 solution. This study reports that magnesium sulfate (MgSO4) as a leaching agent would replace (NH4)2SO4 by ultrasonically assisted leaching to deal with the ammonia-nitrogen pollution problem and enhance leaching process. At leaching conditions of 3wt% MgSO4 concentration, 3:1L/S ratio and 30min, 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.

DOI 10.1016/j.ultsonch.2017.09.028
ISSN 1873-2828
Citation Yin S, Pei J, Jiang F, Li S, Peng J, Zhang L, et al. Ultrasound-assisted leaching of rare earths from the weathered crust elution-deposited ore using magnesium sulfate without ammonia-nitrogen pollution. Ultrason Sonochem. 2018;41:156-162.

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