Monosodium Glutamate as Selective Lixiviant for Alkaline Leaching of Zinc and Copper from Electric Arc Furnace Dust

Abstract

The efficacy of monosodium glutamate (MSG) as a lixiviant for the selective and sustainable leaching of zinc and copper from electric arc furnace dust was tested. Batch leaching studies and XRD, XRF and SEM-EDS characterization confirmed the high leaching efficiency of zinc (reaching 99%) and copper (reaching 86%) leaving behind Fe, Al, Ca and Mg in the leaching residue. The separation factor (concentration ratio in pregnant leach solution) between zinc vs. other elements, and copper vs. other elements in the optimum condition could reach 11,700 and 250 times, respectively. The optimum conditions for the leaching scheme were pH 9, MSG concentration 1 M and pulp density 50 g/L. Kinetic studies (leaching time and temperature) revealed that the saturation value of leaching efficiency was attained within 2 h for zinc and 4 h for copper. Modeling of the kinetic experimental data indicated that the role of temperature on the leaching process was minor. The study also demonstrated the possibility of MSG recycling from pregnant leach solutions by precipitation as glutamic acid (>90% recovery).

Iron in leaves: chemical forms, signalling, and in-cell distribution

“… Value is corrected according to Martell and Hancock (1996) , due to different ionic strength. References are identified with letters: a Goldberg et al , 2002 ; b Lide, 2004 ; c O’Neil, 2013 ; d Hider and Kong, 2011 ; e Hider et al , 2004 ; f von Wirén et al ., 1999 ; g Silverstein and Heller, 2017 ; h Martell and Smith, 1977 ; i Silva et al , 2009 ; j Murphy et al , 2020 ; k Prasetyo et al , 2020 ; l Anderegg and Ripperger, 1989 ; m Martell and Hancock, 1996 ; n Hanikenne et al , 2021 ; o Hider et al , 2021 . Asp, aspartate; Cit, citrate; Cys, cysteine; Glu, glutamate; GSH, glutathione; His, histidine; Mal, malate; NA, nicotianamine; n.d., not detectable.…”

Advances in Mineral Processing and Hydrometallurgy

“…Prasetyo et al [25] provide novel research in "Monosodium Glutamate as Selective Lixiviant for Alkaline Leaching of Zinc and Copper from Electric Arc Furnace Dust". The efficacy of monosodium glutamate (MSG) as a lixiviant for the selective and sustainable leaching of zinc and copper from electric arc furnace dust was tested.…”

Application of a Simple Pretreatment in the Process of Acid Leaching of Electric Arc Furnace Dust

“…Generally, during the production of one ton of crude steel, about 10-20 kg of EAF dust is generated [27]. To a large extent, the composition of EAF dust depends on the electric arc furnace operating conditions, the characteristics of the scrap iron charged to the furnace, the operating period, and the specification of the produced steel, and it is also specific to each plant [1,12,17,18,[23][24][25][27][28][29][30][31][32][33][34].…”

“…The dust from an electric arc furnace contains significant amounts of zinc and solid iron oxides, as well as variable amounts of lead, calcium, manganese, nickel, copper, cadmium, magnesium, silicon, chromium, fluorine, chlorine, etc. [6,7,9,12,25,[29][30][31][35][36][37]. The zinc content of EAF dust varies between 2 and 40% [5,22,26,27].…”

“…Because of the fact that it contains heavy metals, EAF dust is a toxic product. In many countries of the world, it is considered a hazardous solid industrial waste, and therefore, it represents a problem for disposal in an environmentally friendly way because it has the potential to cause long-term environmental pollution [21,24,29,[31][32][33][35][36][37].…”