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Separations
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Separation and Extraction of Solid Waste Resources
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Separation and Extraction of Solid Waste Resources

A special issue of Separations (ISSN 2297-8739). This special issue belongs to the section "Environmental Separations".

Deadline for manuscript submissions: closed (25 November 2023) | Viewed by 2741

Special Issue Editor

Dr. Guoquan Zhang

E-Mail Website
Guest Editor
School of Chemical Engineering, Sichuan University, Chengdu 610065, China
Interests: hydrometallurgy; solvent extraction; metal recycling; leaching; ionic liquid
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Solid waste is the production, life and other activities generated in the loss of the original use value, or if not lost use value, then an abandoned solid or semi-solid, placed in containers of gaseous objects, substances. After certain treatment or processing, the useful substances contained in solid waste can be extracted and continue to play a role in the industrial production process, and some solid waste can also be changed into new energy or resources. Solid waste resource utilization refers to the process of extracting elemental resources with recycling value from solid waste through physical or chemical treatment processes such as smelting, extraction, electrolysis, and purification, and further processing and producing them into products. The treatment of solid waste can be roughly divided into two categories. One is the recycling of solid waste. For example, the electroplating sludge of precious metals is refined through multiple procedures such as dehydration, concentration, smelting, and purification. The other type is harmless treatment, which mainly reduces the amount of hazardous waste through incineration, landfill, materialization, and eliminates the pollution attribute of waste. Therefore, different solid waste resources need to be treated in different ways.

In this context, this Special Issue mainly focuses on bringing together separation and purification technologies in the field of separation and extraction of solid waste resources, including leaching, adsorption, extraction, precipitation, solidification, etc.

Dr. Guoquan Zhang
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Separations is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • mineralization
  • adsorption
  • extraction
  • precipitation
  • solidification
  • solid waste

Published Papers (2 papers)

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Research

15 pages, 3670 KiB  
Article
Possibilities for the Environmental Processing of Gold-Bearing Ores
by Michaela Sudova, Maria Kanuchova, Martin Sisol, Lubica Kozakova, Michal Marcin and Tomas Holub
Separations 2023, 10(7), 384; https://doi.org/10.3390/separations10070384 - 29 Jun 2023
Viewed by 1145
Abstract
This article will focus on the alkaline leaching of gold-bearing tetrahedrite concentrate in a solution containing sodium sulfide and sodium hydroxide. This selective leaching is followed by the leaching of heavy and waste metals into the solution, which may influence the physical properties [...] Read more.
This article will focus on the alkaline leaching of gold-bearing tetrahedrite concentrate in a solution containing sodium sulfide and sodium hydroxide. This selective leaching is followed by the leaching of heavy and waste metals into the solution, which may influence the physical properties and quality of the desired product, possibly causing environmental toxicity. At the same time, the amount of gold was observed during the leaching process to increase its content in the solid phase for the possibility of recovery and subsequent extraction of the precious metal. Sodium sulfide works very effectively on sulfide minerals which include tetrahedrite, and sodium hydroxide eliminates the hydrolysis of sulfur which slows leaching. The leaching kinetics were carried out with a duration of five hours, and based on volume sampling at certain time intervals from three samples, with the characteristic NaOH concentration, the leaching efficiency was observed from the results with atomic absorption spectrometry. The solid residue containing the tetrahedrite concentrate was analyzed through X-ray photoelectron analysis spectrometry, from which the % solids content was determined, and it is also known to deduce the leached amount of metals for each sample. Full article
(This article belongs to the Special Issue Separation and Extraction of Solid Waste Resources)
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12 pages, 3526 KiB  
Article
Improved Palladium Extraction from Spent Catalyst Using Ultrasound-Assisted Leaching and Sulfuric Acid–Sodium Chloride System
by Jinjiao Wang, Xiaoping Zhu, Jiale Fan, Ke Xue, Shengyu Ma, Ruiming Zhao, Hao Wu and Qin Gao
Separations 2023, 10(6), 355; https://doi.org/10.3390/separations10060355 - 13 Jun 2023
Cited by 1 | Viewed by 1394
Abstract
This paper presents a process for efficiently recovering palladium (Pd) from spent Pd/Al2O3 catalysts used for hydrogenation reactions, using ultrasound-assisted leaching (UAL). A system composed of H2SO4 and NaCl was investigated under ultrasound-enhanced conditions and compared to [...] Read more.
This paper presents a process for efficiently recovering palladium (Pd) from spent Pd/Al2O3 catalysts used for hydrogenation reactions, using ultrasound-assisted leaching (UAL). A system composed of H2SO4 and NaCl was investigated under ultrasound-enhanced conditions and compared to regular leaching methods to demonstrate the superiority of UAL. Single-factor experiments were conducted to determine the optimal conditions for leaching, which included an ultrasound power of 200 W, a liquid–solid ratio of 5:1, a leaching time of 1 h, a leaching temperature of 60 °C, H2SO4 concentration of 60%, and 0.1 mol of NaCl. The leaching rate under these conditions was found to be 99%. Additionally, kinetic analysis of the UAL process showed that the apparent activation energy of the Pd leaching reaction was 28.7 kJ/mol, and it was found that Pd leaching from spent catalysts was controlled by diffusion. The tailings were analyzed by SEM, revealing that during ultrasonic leaching, the specific surface area of the spent catalyst increased, the mass transfer rate of the solution was accelerated, the passivation film on the surface of the spent catalyst was peeled off, and a new reaction interface was formed. This improved the leaching rate of Pd and provided a new approach to efficiently leach precious metals such as Pd from spent catalysts. Full article
(This article belongs to the Special Issue Separation and Extraction of Solid Waste Resources)
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