Synergistic mechanism and decopperization kinetics for copper anode slime via an integrated ultrasound-sodium persulfate process

Fe Foam/Electroactivated Peroxydisulfate: A Highly Efficient Method to Remove Elemental Mercury

“…As depicted in Figure d, the Al foam presented a weak Hg 0 removal activity in the Al foam/EA/PDS system, indicating that the Al foam did not contribute to improved PDS activation. However, the Ni foam, Ti foam, and Cu foam could remove about 80% of Hg 0 , suggesting that Ni, Ti, and Cu foams were useful for electroactivation of PDS. , By comparison, the introduction of the Fe foam could greatly facilitate the removal efficiency of Hg 0 up to 92.5% in 10 min, which was attributed to the presence of zero-valent iron (Fe 0 ) and EA persulfate …”

“…However, the Ni foam, Ti foam, and Cu foam could remove about 80% of Hg 0 , suggesting that Ni, Ti, and Cu foams were useful for electroactivation of PDS. 12,31 By comparison, the introduction of the Fe foam could greatly facilitate the removal efficiency of Hg 0 up to 92.5% in 10 min, which was attributed to the presence of zero-valent iron (Fe 0 ) and EA persulfate. 32 3.2.…”

“…Wang et al reported that • OH oxidation absorption technology could efficiently oxidize Hg 0 into Hg 2+ . Nevertheless, in comparison with • OH, sulfate radicals (SO 4 •– ) innately possess much stronger redox potential ( E 0 = 2.5–3.1 V) and a longer lifespan ( t 1/2 = 30–40 μs). − Moreover, SO 4 •– presented high oxidation reactivity to some contaminants with the aid of ultrasound (US), ultraviolet (UV), heat, and transition metals, ,− as shown in Figure . For instance, Bian et al reported that US-activated peroxydisulfate (PDS) could enhance sludge dewaterability and revealed that the water content from the dewatered sludge cake was reduced to 16.5% .…”

A comprehensive review on the ultrasound-enhanced leaching recovery of valuable metals: Applications, mechanisms and prospects

“…Ultrasound-assisted leaching technology has been extensively applied to extract valuable metals from metal ores, such as vanadium-bearing shale [16] , [19] , chalcopyrite [26] , [49] , scheelite [25] , [50] , [51] , zinc oxide ore [30] , [52] , [53] , nickel laterite ore [17] , rare earth ore [29] , refractory gold ore [27] , [54] , [55] , [56] , [57] , [58] , uranium ore [59] , [60] , K-feldspar [31] , copper-bearing biotite [43] , refractory silver ore [61] , eudialyte [62] , quartz sand [63] , [64] , [65] , [66] , [67] , [68] , poly-metallic sulfide ore [13] , deep-sea nodules [69] , phosphorus-potassium associated ore [21] , sphalerite [32] , and magmatic rocks [70] . In addition, ultrasound-assisted leaching has also been developed with successful enhancement in the leaching efficiency of metals from secondary resources, including metallurgical residues [3] , [15] , [35] , [38] , [39] , [42] , [48] , [71] , [72] , [73] , [74] , [75] , [76] , [77] , [78] , [79] , [80] , [81] , [82] , [83] , [84] , [85] , [86] , spent catalysts [33] , [37] , …”

“…The outcomes showed that the optimum leaching ratio of Cu (93%) and minimum of Fe (3%) were realized with ultrasound, indicating the selective leaching of Cu from Fe. Liu et al [84] proposed an eco-friendly cooperative decopperization technique from copper anode slime via ultrasound-enhanced leaching with sodium persulfate. It was demonstrated that the combination of ultrasound and Na 2 S 2 O 8 induced the transformation of insoluble copper into copper sulfate, which increased the total leaching recovery of Cu from 66.64% to 98.11%.…”