Recovery of zinc, manganese and lead from pyrometallurgical sludge by hydrometallurgical processing - Université de Lorraine Access content directly
Conference Papers Year : 2016

Recovery of zinc, manganese and lead from pyrometallurgical sludge by hydrometallurgical processing

Abstract

Huge amounts of smoke sludge have been generated during ferromanganese manufacturing by blast furnace. These residues have been historically deposited in ponds near steel making plants. They are very rich in zinc, manganese and lead (5 to 40 %) and also contain aluminum and iron. In view of the market value of the metals, these brownfield sites can now be considered as secondary resources. Also, to meet the environmental regulations, these ponds have to be cleaned up. We have developed a hydrometallurgical process to recover Zn, Mn and Pb in order to produce compounds of Mn and Zn pure enough to be economically valuable and a residue rich in Pb. Batch laboratory tests were carried out to determine suitable leaching conditions, using design of experiments. The investigated operating conditions were acid concentration, pulp density and temperature. Optimal conditions were found, to maximize zinc extraction (100 %) and manganese extraction (95.9 %) with sulfuric acid and sodium metabisulfide. The final residue contained 14.8 to 23.8 % of Pb. Then, Zn was recovered in the form of ZnO or ZnS by precipitation and Zn metal by electrowinning, while Mn was recovered as MnCO3 with a fairly acceptable concentration of impurities. Feasibility was assessed by an economic evaluation.
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hal-03610045 , version 1 (16-03-2022)

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  • HAL Id : hal-03610045 , version 1

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Marie-Odile Simonnot, Julien Mocellin, Guy Mercier, Jean François Blais, Patrick Charbonnier, et al.. Recovery of zinc, manganese and lead from pyrometallurgical sludge by hydrometallurgical processing. IMPC 2016: XXVIII International Mineral Processing Congress, Sep 2016, Quebec, Canada. pp 2481-2489 - Paper #311. ⟨hal-03610045⟩
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