Comprehensive Recycling of Metallurgical Solid Waste and Mineral Resources (2nd Volume)

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Extractive Metallurgy".

Deadline for manuscript submissions: 30 June 2026 | Viewed by 606

Special Issue Editor

Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
Interests: pyrometallurgy; hydrometallurgy; extractive metallurgy; recovery and separation; secondary resources; mineral extraction
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Special Issue Information

Dear Colleagues,

Metallurgy is the basic industry of modern industrial development, providing basic raw materials for the development of most industries. With the rapid development of industry and the sharp increase in resource exploitation around the world, a lot of smelting solid waste is generated. The accumulation of smelting solid waste not only occupies a large area of land but also causes dust and heavy metals to seep into the ground, polluting the environment. Therefore, it is particularly important for the sustainable development of modern industry to carry out research on resource exploitation, smelting and the harmless recycling of solid waste.

Strengthening the research of basic science is the key to break through the exploitation of resources, smelting and recycling of solid waste. Through the research of basic scientific problems and the research and development of new theories, new processes and new products can promote the exploitation of mineral resources, smelting and industrial solid waste resource application to a new stage and new heights, and can realize the sustainable development of mineral resource smelting and solid waste resources harmlessly.

For this Special Issue, we welcome articles that focus on the exploitation of resources, smelting and recycling of solid waste. Research on new processes, new theories and new products that can realize the recycling of and reduction in metallurgical solid waste are of particular interest.

Dr. Long Meng
Guest Editor

Manuscript Submission Information

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Keywords

  • pyrometallurgy
  • hydrometallurgy
  • extractive metallurgy
  • recovery and separation
  • secondary resources
  • mineral extraction
  • rare earth
  • molten salt electrolysis
  • aluminum electrolysis

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Published Papers (1 paper)

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Research

13 pages, 2958 KB  
Article
Removal of Hf(IV) Ions from Zr(IV) Ions in Sulfuric Acid Solution by Solvent Extraction with PC88A
by Mingming Han, Jing Song, Hongqian Sun, Xiaoru Zhang and Tao Qi
Metals 2026, 16(1), 67; https://doi.org/10.3390/met16010067 - 6 Jan 2026
Viewed by 454
Abstract
The study aimed to remove Hf(IV) ions from Zr(IV) ions in sulfuric acid solution using PC88A, investigating the extraction and separation of high-concentration zirconium (Zr) and hafnium (Hf) in such systems. Key factors, including solution acidity and SO42− concentration, were examined. [...] Read more.
The study aimed to remove Hf(IV) ions from Zr(IV) ions in sulfuric acid solution using PC88A, investigating the extraction and separation of high-concentration zirconium (Zr) and hafnium (Hf) in such systems. Key factors, including solution acidity and SO42− concentration, were examined. Results showed that acidity affected the size of Zr/Hf ion clusters, and PC88A exhibits a higher extraction preference for Hf(IV) over Zr(IV), achieving a separation factor (βHf/Zr) of 4.56 at 4 mol/L H+. Adding SO42− reduced its separation efficiency for Zr and Hf. Combined with slope analysis and FT-IR spectroscopy, Hf extraction by PC88A followed cation-exchange and solvation mechanisms, with 3 PC88A dimers consumed per Hf ion. Stripping experiments demonstrated that 1 mol/L sulfuric acid selectively stripped Zr from the loaded organic phase. Extraction and stripping equilibrium curves were constructed, confirming that 3 stages of Hf(IV) extraction from the solution and 4 stages of Zr(IV) stripping from the loaded organic phase are needed: 3 theoretical stages (O/A = 1) enabled complete Hf extraction, while 4 stages (A/O = 3:1) achieved full Zr stripping. This work provides a basis for efficient Zr-Hf separation using PC88A. Full article
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