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Novel approach for removing iron-cyanide complex ions and cesium ions from solutions using hydrogel-like beads.
- Source :
-
Hydrometallurgy . Aug2023, Vol. 221, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
-
Abstract
- In the process of recycling cyanide leaching solutions, the presence of iron-cyanide complex ions in gold leaching solutions leads to increased cyanide consumption and competition with gold for adsorption onto activated carbon. Consequently, the removal of iron- cyanide complex ions from cyanide leaching solutions is crucial. This study presents a novel strategy for the treatment of metal ions in leaching solutions, achieving effective waste treatment using hydrogel-like beads. To remove iron-cyanide complex ions from cyanide leaching solutions, we synthesized carboxymethyl cellulose‑iron (CMC Fe) hydrogel through a crosslinking method. The adsorbent, carboxymethyl cellulose-Prussian blue (CMC-PB) hydrogel, obtained after iron-cyanide complex ion adsorption, can directly remove Cs+ ions from solution without the need for desorption and regeneration. Notably, the CMC-Fe hydrogel exhibits exceptional adsorption performance and high selectivity toward iron-cyanide complex ions. The adsorption process of the CMC-Fe hydrogel follows a pseudo-second-order kinetic model, while the Freundlich isotherm model is more suitable for describing the adsorption equilibrium. Additionally, the CMC-PB hydrogel efficiently adsorbs 83.1% of Cs+ ions at a dosage of 86.5 μg, and desorption and regeneration studies reveal that its adsorption efficiency remains high even after three cycles. Furthermore, the proposed adsorption mechanism of CMC-PB for Cs+ ions involves a combination of chemisorption (K+/Na+ exchange) and physisorption (hole channels of hydrogels). [Display omitted] • The CMC-Fe hydrogel was applied to adsorption for iron cyanide complex ions. • The CMC-PB hydrogel adsorption cesium was developed. • The CMC-Fe exhibited excellent adsorption efficiency for iron cyanide complex ions. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0304386X
- Volume :
- 221
- Database :
- Academic Search Index
- Journal :
- Hydrometallurgy
- Publication Type :
- Academic Journal
- Accession number :
- 170412805
- Full Text :
- https://doi.org/10.1016/j.hydromet.2023.106155