Leaching kinetics of copper and valuable metal extraction from copper-cadmium residues of zinc hydrometallurgy by oxidation acid leaching
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Jihao Guo
,
Yonggang Wei
Abstract
Multiple purification of zinc sulfate solution is an important process for zinc hydrometallurgy, and large quantities of copper-cadmium residues are generated as byproducts in this process. Copper-cadmium residues contain a large number of valuable metals that must be recovered. A comprehensive extraction process has been proposed using sulfuric acid as the leaching reagent and hydrogen peroxide as the oxidizing reagent. The effects of acid concentration, leaching temperature, leaching time, liquid-to-solid ratio, hydrogen peroxide dosage and stirring speed on the leaching efficiency were investigated. The optimum conditions were determined as an acid concentration of 150 g/L, liquid-to-solid ratio of 4:1, hydrogen peroxide amount of 20 mL, time of 60 min, temperature of 30 °C, particle size of −d75 μm, and agitation rate of 300 r/min. It was concluded that the leaching efficiency of copper and cadmium reached 97%, but because of the existence of zinc sulfide in the residues, a lower leaching efficiency of zinc was obtained. Furthermore, the leaching kinetics of copper was also studied based on the shrinking core model. The activation energy for copper leaching was 5.06 kJ/mol, and the leaching process was controlled by the diffusion through the product layer.
Funding source: National Natural Science Foundation of China
Award Identifier / Grant number: 51764035
Funding source: Natural Science Foundation of Yunnan Province http://dx.doi.org/10.13039/501100005273
Award Identifier / Grant number: 2018FB089
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: Financial support for this study was supplied from the National Natural Science Foundation of China (Project No. 51764035) and the Natural Science Foundation of Yunnan province (Project No. 2018FB089).
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Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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Articles in the same Issue
- Frontmatter
- Articles
- Tribological characterization of graphene oxide by laser ablation as a grease additive
- Hydro-liquefaction of asphaltene catalyzed by molybdenum-nickel bimetallic catalysts in slurry bed
- Leaching kinetics of copper and valuable metal extraction from copper-cadmium residues of zinc hydrometallurgy by oxidation acid leaching
- Numerical investigation on optimization of wall jet to reduce high temperature corrosion in 660 MW opposed wall fired boiler
- Kinetics of catalytic treatment of coking wastewater (COD, phenol and cyanide) using wet air oxidation
- Controllable oxidation of cyclohexanone to produce sodium adipate in an electrochemical reactor with a Pt NPs/Ti membrane electrode
- Numerical study on key issues in the Eulerian-Eulerian simulation of fluidization with wide particle size distributions
- Dynamics investigation on methane hydrate formation process with combined promotion methods
