Abstract
The study of copper adsorption onto ion exchange resins of anionic type is part of the gold recovery from ammonia-thiosulfate solutions, where copper is the main impurity of the system because it acts as a catalyst of gold dissolution reaction. A study is made of the adsorption and desorption of copper in the form of the complex in an ammonia-thiosulfate media on an ion exchange resin, DOWEX 550A, classified as a strong base, which in its inner structure has a quaternary amine functional group. In the studied pH range copper adsorption increased with increasing pH, while the presence of thiosulfate decreased it, the same as the ammonia content, due to the greater presence of cuprotetramine, . Elution of the copper complexes from the resin was more efficient with sulfite than with perchlorate.
Highlights
The study of copper adsorption on anion exchange resins has to do with the recovery of gold as ( ) Au3− 2 present in the solutions produced by leaching gold ores in an ammonia-thiosulfate media, where copper is the main impurity in the system
The study of copper adsorption onto ion exchange resins of anionic type is part of the gold recovery from ammonia-thiosulfate solutions, where copper is the main impurity of the system because it acts as a catalyst of gold dissolution reaction
Study is made of the adsorption and desorption of copper in the form of the [3− 2] complex in an ammonia-thiosulfate media on an ion exchange resin, DOWEX 550A, classified as a strong base, which in its inner structure has a quaternary amine functional group
Summary
The study of copper adsorption on anion exchange resins has to do with the recovery of gold as ( ) Au. 3− 2 present in the solutions produced by leaching gold ores in an ammonia-thiosulfate media, where copper is the main impurity in the system. The ammonia-thiosulfate system with copper offers high gold leaching rates compared to the cyanide system, because the reaction is catalyzed by cupric ions [1]-[23]. The main reaction in the gold leaching in a thiosulfate-ammonia media is the following: Au0 + ( NH3 + 5S2O23− → 3− 2 )5− 3 + 4NH3 (1)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
