Journal
MINERALS ENGINEERING
Volume 150, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.mineng.2020.106254
Keywords
Diglycolamic acid extractant; Precious metals; Recyclability; Separation; Solvent extraction
Funding
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry [1685(2014)]
- Science and Technology Projects of Xiamen [3502Z20142010, 3502Z20152016]
- Science and Technology Major Projects of Fujian Province [2014HZ01120004, 2015HZ0001-3]
- Science and Technology Service Network Initiative [2017T3002, 2018T3025]
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The type of diglycolamic acid extractantN,N-di-2-ethylhexyldiglycolamic acid (D2EHDGAA) was examined for selective extraction and separation of Au(III) in acidic chloride solutions containing Pd(II), Pt(IV), Rh(III), and Cu(II). The separation factor beta(Au/)(pt) = 959.3 was observed in 7 M hydrochloric acid. The extraction of Au(III) was quick, and extraction equilibrium was reached in less than 5 min. The n-dodecane and kerosene diluents had a notable effect on the extraction of Au(III) with the D2EHDGAA, and the D2EHDGAA had excellent capacity in n-dodecane and kerosene. However, the selectivity coefficient of Au(III) and Pd(II) was better in n-dodecane (beta(Au/)(Pd )= 1070) than in kerosene (beta(Au/)(Pd) < 0.1) of 4 M hydrochloric acid. The extraction mechanisms of the Au(III) and Pt(IV) were investigated, and the results suggest that one metals ion is extracted with two and one extractants in 1 M HCl concentration. The D2EHDGAA-based n-dodecane extracting phase was easily activated using a low-concentration thiourea aqueous solution (0.01 M). The recyclability of D2EHDGAA for five cycles was investigated, and its efficiency decreased less than 4%.
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