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http://dx.doi.org/10.18770/KEPCO.2021.07.01.153

Simultaneous Extraction of Yttrium and Neodymium from Fly Ash by Two-Step Leaching Process with Aid of Ultrasonic Wave  

Kim, Jae-Kwan (KEPCO Research Institute, Korea Electric Power Corporation)
Park, Seok-Un (KEPCO Research Institute, Korea Electric Power Corporation)
Publication Information
KEPCO Journal on Electric Power and Energy / v.7, no.1, 2021 , pp. 153-159 More about this Journal
Abstract
A two-step process for increasing the leaching efficiency of yttrium and neodymium from coal fly ash were investigated at solid loadings of 5.0 g ash ~1,000 g ash/l of 1.0 N~10.0 N H2SO4, temperature ranging from 30℃ to 90℃, ultrasonic leaching time of 1~10 hours, and ultrasonic power of 25~200 W. The yttrium and neodymium from coal fly ash were effectively leached into ion phases by step change of the first conventional dissolution at room temperature and then the second heating process with the aid of ultrasonic wave, and maximum leaching efficiency of yttrium and neodymium obtained were 66 % and 63 %, respectively. The activation energies for the leaching reaction of yttrium and neodymium at second heating process dependent on leaching time and temperature were derived to be 41.540 kJmol-1 and 507.92 kJmol-1, respectively. The optimum conditions for the maximum leaching of yttrium and neodymium were found to be the solid loading of 250 g ash/l of H2SO4, solvent concentration of 2.0 N H2SO4, and second step process of temperatures of 30℃ for 3 hours and then 90℃ for 4 hours with ultrasonic intensity of 100 W.
Keywords
Fly Ash; Leaching; Yttrium; Neodymium; Sulfuric Acid; Ultrasonic Wave;
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Times Cited By KSCI : 3  (Citation Analysis)
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