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Open AccessFeature PaperArticle

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

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Research Unit for Mineral Technology, Indonesian Institute of Sciences, Jl. Ir. Sutami km. 15 Tanjung Bintang, Lampung Selatan 35361, Indonesia
2
George Ansell Department of Metallurgical and Materials Engineering, Kroll Institute for Extractive Metallurgy, Mining Engineering Department, Colorado School of Mines, 1500 Illinois St, Golden, CO 80401, USA
*
Author to whom correspondence should be addressed.
Metals 2020, 10(5), 644; https://doi.org/10.3390/met10050644
Received: 27 April 2020 / Revised: 11 May 2020 / Accepted: 12 May 2020 / Published: 15 May 2020
(This article belongs to the Special Issue Advances in Mineral Processing and Hydrometallurgy)
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). View Full-Text
Keywords: electric arc furnace dust; monosodium glutamate; leaching; zinc; copper electric arc furnace dust; monosodium glutamate; leaching; zinc; copper
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MDPI and ACS Style

Prasetyo, E.; Anderson, C.; Nurjaman, F.; Al Muttaqii, M.; Handoko, A.S.; Bahfie, F.; Mufakhir, F.R. Monosodium Glutamate as Selective Lixiviant for Alkaline Leaching of Zinc and Copper from Electric Arc Furnace Dust. Metals 2020, 10, 644.

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