Przemysl Chemiczny, Vol.96, No.11, 2284-2290, 2017
Recovery of rare earth elements from fly ash. Part 2. Precipitation
The soln. of rare earth elements (454.1 ppm) prepd. by leaching the fly ash-Na2CO3 sinters with aq. HCl) (S. Zelazny et al., 2017) was neutralized with aq. NH3 and treated with oxalic acid to ppt. the resp. oxalates. The produced concentrate contained more than 1% of rare earth elements.