KEPCO Journal on Electric Power and Energy

Korea Electric Power Corporation (한국전력공사)
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Simultaneous Extraction of Yttrium and Neodymium from Fly Ash by Two-Step Leaching Process with Aid of Ultrasonic Wave

2단계 침출 과정에서 발생되는 비산회로부터 초음파 활용하여 이트륨과 네오디뮴의 동시 추출

  • Kim, Jae-Kwan (KEPCO Research Institute, Korea Electric Power Corporation) ;
  • Park, Seok-Un (KEPCO Research Institute, Korea Electric Power Corporation)
  • Received : 2020.12.09
  • Accepted : 2021.02.16
  • Published : 2021.06.30
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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

Acknowledgement

This research was conducted in 2013 with support from the Energy Technology Development Project [20132510100040] of the Korea Institute of Energy Technology Evaluation and Planning, financed by the Ministry of Trade, Industry and Energy.

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