Selective silver electroseparation from ammoniacal thiosulfate leaching solutions using a rotating cylinder electrode reactor (RCE)

The use of a rotating cylinder electrode to selective recover palladium from acid solutions used to manufacture automotive catalytic converters

“…the volume of electrolyte which could be treated in a unit volume reactor with a ten-fold reduction in metal ion concentration, was 1.35 9 10 -4 dm 3 dm -3 s -1 which is the same order of magnitude of values reported for the recovery of 100 mg dm -3 of silver using a titanium RCE at 100 rpm, from solutions simulating concentrated minerals (10 9 10 -4 s -1 [39]). Also values of 0.5-3.3 9 10 -4 s -1 were reported for the recovery of 500 mg dm -3 of cadmium on a stainless steel 316 RCE at 500 rpm at electrolysis between 0.8 and 1.4 V versus SCE [39].…”

“…the volume of electrolyte which could be treated in a unit volume reactor with a ten-fold reduction in metal ion concentration, was 1.35 9 10 -4 dm 3 dm -3 s -1 which is the same order of magnitude of values reported for the recovery of 100 mg dm -3 of silver using a titanium RCE at 100 rpm, from solutions simulating concentrated minerals (10 9 10 -4 s -1 [39]). Also values of 0.5-3.3 9 10 -4 s -1 were reported for the recovery of 500 mg dm -3 of cadmium on a stainless steel 316 RCE at 500 rpm at electrolysis between 0.8 and 1.4 V versus SCE [39]. In the present work, the mass of palladium removed during the 3 h electrolysis was 2,267 mg which is considerably larger than the amount removed in the previous work [34,36] and shows the great flexibility of the RCER to deal with such effluents in a short period of time.…”

Electrochemical reclamation of silver from silver-plating wastewater using static cylinder electrodes and a pulsed electric field

“…Alejandro et al have designed reactors with RCE for the recovery of silver from ammoniacal thiosulfate leaching solution. These reactors exhibit a recovery rate of 80% and produce deposits containing 90% silver [19]. Chatelut et al designed a reactor with RCE for the recovery of silver from photographic wastewater with Ag(I) concentrations as high as 10 g L −1 , and achieved a recovery rate higher than 95% [20].…”

The rotating cylinder electrode for studies of corrosion engineering and protection of metals—An illustrated review

“…While many RCE corrosion studies have been targeted to the oil and gas industry, particularly the evaluation of inhibitors, increasing use of RCE electrode and cell designs are being implemented into other sectors, including monitoring of metal release to monitor water quality in closed loop systems [27], selective recovery of Ag from Cu-containing mining streams [28], conversion of sulfur dioxide [29] …”