Removal of arsenic and sulfur from a refractory gold concentrate by microwave heating

Microwave-assisted arsenic removal and the magnetic effects of typical arsenopyrite-bearing mine tailings

“…3(a)-2). In addition, the poor S-removal efficiencies studied here were similar to those studies in previous reports under an oxygen-free atmosphere [31,49].…”

“…3). Thus, this phenomenon indicates that the arsenopyrite-bearing tailings studied here were unlike those of the previously reported arsenic-bearing ores, for which As could be easily heated and removed via microwave irradiation [31,32]. optimized MAMs, which not only promoted the As-removal efficiency of the tailings, but also significantly enhanced the magnetic effect of the reaction residuals.…”

“…Consequently, As-contamination threatens the ecological environment and human microwave treatment [31], which significantly improves the As-removal efficiency and shortens the processing time. Moreover, As can be removed from ores in the As 2 O 3 product [32].…”

Microwave Heating Applications in Mineral Processing

“…Ma et al, 2008 58 , investigated removal of sulfur and arsenic from refractory flotation gold concentrates, bearing with 14.95% of As and 27.85% of S, by microwave roasting. Cooling patterns of the roasted products obviously affected the removal effects under oxygen-free roasting atmosphere.…”

Microwave Pretreatment for Thiourea Leaching for Gold Concentrate

“…Huang and Rowson [11] treated pure pyrite and marcasite using microwaves in a mid-temperature (50 • C) nitric acid solution. Ma et al [12] studied the microwave treatment for the removal of sulfur and arsenic in Au concentrate. Amankwah and Pickles [13] reported the use of microwaves as a pretreatment process for gold recovery from carbonaceous sulfide concentrate by cyanide leaching.…”