Metallurgical Engineering

Metallurgical Engineering

Replacement of the Chloride Washing Process in the Recovery of Zinc FromSteel-MakingDust with an Environmentally Friendly Method Based on Solvent Extraction

Document Type : Research Paper

Authors
Saeid Karimi 1
Pedram Ashtari 2
Mahshad Mahshad Rafatinia 3
Zahra Mohammad Alizadeh 4
Maryam Akbari 4
Samad Ghasemi 1
1 Assistant Professor, Department of Metallurgy and Materials Engineering, Hamedan University of Technology, Hamedan, Iran.
2 Assistant Professor, Department of Mining, Hamedan University of Technology, Hamedan, Iran.
3 Master of Science Student, Department of Metallurgy and Materials Engineering, Hamedan University of Technology, Hamedan, Iran.
4 Bachelor of Science Student, Department of Metallurgy and Materials Engineering, Hamedan University of Technology, Hamedan, Iran.
10.22076/me.2023.560065.1358
Abstract
The recycling of steel-making dust was investigated using the leaching process in sulfuric acid and the separation of zinc ions by solvent extraction method. Due to the high chloride content of steel-making dust, the spent used in the experiments after the completion of the processes in the first cycle was returned to the beginning of the steel-making furnace dust recycling process to investigate the effect of chloride ions on the extraction of zinc metal. Aqueous solution was prepared by dissolving steel-making dust in sulfuric acid and followed by precipitation of iron in hydroxide form. To separate zinc from aqueous solution, D2EHPA agent was used at a constant temperature of 25 ºC and the ratio of aqueous to organic phase was 1:1. The effect of pH parameter in the range of 1-5 and volume concentration of extractant 5-30% on the extraction of zinc in three cycles of return spent were investigated. According to the results, an increase in pH up to about 3, the extraction of zinc increased enormousely, and the extraction was almost complete at higher than 3. Also, an increment in D2EHPA concentrationenhanced the zinc extraction and the optimum extraction was found to be 30%. Thermodynamic calculations showed that the main active ion of zinc in the leaching solution is Zn2+ and in the first cycles, it controls the absorption mechanism by the D2EHPA extractant. The fitting of thermodynamic data for the 10th cycle also showed that the molar percentage of ZnCl+ species changes from 2.05 % to 12.86%.
Keywords
Steel-Making Dust
Zinc Recycling
Solvent Extraction (SX)
Separation of chloride ion
Thermodynamic Calculation
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  • Receive Date 12 August 2022
  • Revise Date 25 December 2022
  • Accept Date 01 January 2023