Solvent extraction of silver from nitric acid solutions by calix[4]arene amide derivatives

Recovery of high-purity silver directly from dilute effluents by an emulsion liquid membrane-crystallization process

“…For total recovery of Ag + from the external phase, the amount of H 3 PO 2 in the internal phase should exceed the stoichiometric amount of Ag + based on Eq. (3). Under the present conditions, the volume of the external phase in each experiment was 250 mL and contained 12.83 mg of Ag + , which needed at least 3.92 mg of H 3 PO 2 to capture all Ag + .…”

“…The concentration of silver in these effluents varies widely, in spent developing and fixing solutions, the concentration of silver may be as high as several g/L, but in waste rinse water it may be as low as a few mg/L. Methods such as solvent extraction, adsorption, electrochemical deposition, and chemical precipitation have been investigated for recovering silver from developing and fixing solutions [3][4][5][6]. Waste rinse water from the photographic industry is often discharged after being treated to reach the national emission standard (<0.5 mg/L) and seldom considered the recovery of silver, which inevitably results in loss of silver.…”

Extraction of palladium(II) from nitric acid solutions with diglycolthioamide

“…It can be seen that high extraction percentages, over 80% by mono-TODGTA and nearly 100% when using di-TODGTA, are achieved at C TODGTA /C Pd b 0.5 for mono-TODGTA and C TODGTA /C Pd b 1.1 for di-TODGTA. The intersection projection values can reflect relation between the number of moles of extractant and that of metal ion at saturation according to previous work (Stankovic et al, 2008). The experimental data in Fig.…”

Recovery of Silver from the Nitrate Leaching Solution of a Spent Ag/α-Al₂O₃ Catalyst by Solvent Extraction and Reduction

“…Recovery of Ag from nitrate solution is mainly studied at low acid concentrations, typically above a pH of 1, while that at high acid concentration solutions is limit. [13][14][15][16][17][18][19] 5, 8-diethyl-7-hydroxy-dodecan-6-oxime (LIX63) has been used in research and industrial settings to extract many metals, including cobalt, nickel, palladium, gallium, and molybdenum. [20][21][22][23] In our previous study, 24) LIX63 was used to selectively extraction of silver from the nitrate leaching solution of spent Ag/α-Al 2 O 3 catalyst, which contains Ag 7.08, Al 0.07, Si 0.04, Ca 0.007, and Re 0.016 g/dm 3 .…”