Zinc Extraction from Primary Lead Smelting Slags by Oxidant Alkaline Leaching

The purpose of this work is to obtain the optimum conditions for leaching the zinc contained in an industrial lead smelting slag. In this type of slag, zinc oxide, sulfide, and ferrite are contained. Zinc extraction from these compounds consists of using a single aqueous medium, where oxidant alkali...

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Bibliographic Details
Published in:Processes 2024-07, Vol.12 (7), p.1409
Main Authors: Najera Ibarra, Juana María, Soria-Aguilar, Ma. de Jesus, Martínez-Luevanos, Antonia, Picazo-Rodriguez, Nallely Guadalupe, Almaguer-Guzman, Isaias, Chaidez-Felix, Josue, Carrillo-Pedroza, Francisco Raúl
Format: Article
Language:English
Subjects:
Activation energy
Alkaline leaching
Aqueous solutions
Diffusion rate
Environmental impact
Heavy metals
Iron compounds
Leaching
Lead
Lead industry
Metallurgy
Optimization
Oxidants
Oxidizing agents
Slag
Smelting
Sodium hydroxide
Sodium hypochlorite
Solids
Steel production
Sulfides
Variance analysis
Zinc compounds
Zinc oxide
Zinc oxides
Zinc products
Zinc sulfide
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Summary:The purpose of this work is to obtain the optimum conditions for leaching the zinc contained in an industrial lead smelting slag. In this type of slag, zinc oxide, sulfide, and ferrite are contained. Zinc extraction from these compounds consists of using a single aqueous medium, where oxidant alkaline leaching with NaOH and NaClO was used. The parameters evaluated during the experiment were as follows: percentage of solids, NaOH/NaClO ratio, and temperature. The maximum amount of recovered Zn obtained during the leaching was 58%. This percentage was achieved by using the following optimal conditions: temperature of 60 °C, 0.22 of NaOH/NaClO ratio, 10% of solids, and a reaction time of 40 min. The calculated values of activation energy confirmed that the rate-limiting step of the reaction using the decreasing particle model is diffusion. The maximum percentage of zinc obtained could only have been achieved if the zinc oxide and part of the zinc sulfide (both present in almost equal proportions in the sample) were leached into the alkaline aqueous medium in the presence of NaClO.
ISSN:2227-9717
2227-9717
DOI:10.3390/pr12071409