Removal of arsenic in acidic wastewater using Lead–Zinc smelting slag: From waste solid to As-stabilized mineral

Utilization of Lead Slag as In Situ Iron Source for Arsenic Removal by Forming Iron Arsenate

“…No diffraction peaks of scorodite or iron arsenate were detected in XRD analysis, probably because the low crystallinity of the iron arsenate precipitate or the weaker signal of amorphous iron arsenate were shielded by gypsum. These findings are consistent with the results of Duan and Li [ 26 , 43 ]. The difference is that the diffraction peaks of scorodite were observed in the precipitation of the reaction for 12 h by Li et al, indicating that the formation of scorodite crystals takes some time; however, in our study, the formation of scorodite was not observed, which may be caused by the different reaction conditions.…”

“…However, its high iron content and strong alkalinity make it acceptable for use as an in situ iron source for the treatment of acidic arsenic-containing wastewater. Li et al [ 26 ] used LZSS (Lead–Zinc smelting slag) as an in situ Fe donor and neutralizer to remove arsenic from wastewater in the form of scorodite under 90 °C, and a 98.42% removal efficiency of arsenic was achieved with an initial As concentration of 7530 mg/L and H 2 SO 4 concentration of 53,420 mg/L. In addition, we successfully obtained 99.95% As removal efficiency at room temperature with an initial As concentration of 6500 mg/L and H 2 SO 4 concentration of 56,000 mg/L.…”

Effective removal of As from a high arsenic-bearing ZnSO4 solution by ultrasonic enhanced ozonation in a one-pot method

“…2 d, the FT-IR spectrum of the arsenic-containing precipitate is presented. The band observed at 834 cm −1 is associated with the tensile vibration of As(V)-O-Fe in amorphous iron arsenate [45] . Additionally, the band at 562 cm −1 corresponds to the vibration induced by Fe-O coordination, such as Fe-O-As(V) [46] .…”

Characteristics of solid waste from common generation source in nonferrous smelting industry reveal a new classification method

“…The sulfur dioxide flue gas produced in the smelting process was washed by acid in the purification procedure with a strongly acidic environment, and acid mud was produced after precipitation. In contrast, sodium hydride sulfide was added to As containing waste acid produced during the purification procedure to remove As impurities, and then As was produced [ 32 ]. After removing the As, the waste acid entered a neutralization procedure by adding carbide slag, which was composed of calcium hydroxide with strong alkalinity.…”