2034 Leaching Characteristic of Cerium and Yttrium from Non-magnetic Solid Waste Coal Fly Ash after Silicate Digestion using Acetic Acid
DOI:
https://doi.org/10.17159/Abstract
The leaching kinetics of Cerium (Ce) and Yttrium (Y) in sodium-hydroxide-digested non-magnetic coal fly ash using acetic acid was investigated. The variables analyzed were pH, solid to liquid ratio (S/L), and temperature. The results show that Cerium and Yttrium's maximum recovery was 57.33 % and 58.36 %, respectively, under leaching temperature of 90 0C for Ce and 60 0C for Y at pH of 1,74 and 10 g/mL solid-liquid ratio in 240 min. Increasing leaching time to more than 120 minutes did not significantly improve. After the magnetic separation process, the ICP-MS analysis shows a slight increase in the concentration of Cerium and Yttrium on non-magnetic components. The XRD and ICP-EOS analysis for the sample before and after silicate digestion shows that 40% silicate was dissolved. The calculation of apparent activation energies of leaching using Arrhenius law for the leaching of Cerium and Yttrium gives 22.72 kJ/mol and 35.84 kJ/mol, respectively. The kinetic leaching model of Cerium and Yttrium all fitted in Dickinson's new model of the shrinking core model. The calculation results show that the leaching reaction is controlled by combining interface transfer and diffusion across the product layer.
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