Split regeneration of chelating resins for the selective recovery of nickel and copper
作者： Laura Ulloa , Marina Martínez-Minchero , Eugenio Bringas , Adolfo Cobo , M. Fresnedo San-Román
DOI: 10.1016/J.SEPPUR.2020.117516
关键词:
摘要: Abstract The management of spent acids containing heavy metals has been traditionally carried out by neutralization-precipitation technologies that often fail to provide the required selectivity for metal recovery. This work proposed a split elution process using H2SO4 and NH4OH solutions regenerate bispicolylamine-based chelating resins (Puromet™ MTS9600) employed in previous separate nickel copper from sulfuric acid effluents. Operation variables namely S/L ratio, concentration regeneration agents configuration were analysed select best conditions optimize unloading their selective recovery independent solutions. It was found 43% eluted resin 2.0 M recovered with purities 98% while 47% desorbed 97%. long-term assessment evidenced removal not affected after 10 adsorption-regeneration cycles, adsorption efficacy decreased about 10%.
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