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Separations
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Green and Efficient Separation and Extraction of Salt Lake Resources
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Green and Efficient Separation and Extraction of Salt Lake Resources

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

Deadline for manuscript submissions: 20 December 2024 | Viewed by 1399

Special Issue Editors

Prof. Dr. Xiushen Ye

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Guest Editor
Key Laboratory of Green and Highly-end Utilization of Salt Lake Resources, Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Qinghai 810008, China
Interests: separate materials and technologies for the rare elements in salt lakes
Prof. Dr. Dandan Gao

E-Mail Website
Guest Editor
Key Laboratory of Green and Highly-end Utilization of Salt Lake Resources, Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Qinghai 810008, China
Interests: separation technology of rare elements in salt lakes
Prof. Dr. Shiqiang Wang

E-Mail Website
Guest Editor
Key Laboratory of Marine Resource Chemistry and Food Technology (TUST), Ministry of Education of China College of Marine and Environmental Sciences, Tianjin University of Science and Technology, Tianjin, China
Interests: phase equilibria and separation of salt lake resources

Special Issue Information

Dear Colleagues,

Salt lakes are invaluable repositories of multi-ionic and multi-component inorganic salt resources, rich in elements such as potassium, lithium, boron, rubidium and cesium. These resources are closely tied to developments in agriculture, industry and aerospace. With technological advancements, particularly in new energy and high-tech industries, there is an increasing demand for the development and utilization of components such as lithium, boron, rubidium and cesium from brines. The key scientific and technological challenges in efficient separation and extraction techniques have become pivotal for maximizing resource utilization.

This Special Issue aims to highlight breakthroughs and innovations in the green and efficient separation and extraction of salt lake resources. We seek contributions that report on the latest advancements in materials, mechanisms and processes in the adsorption, extraction, membrane technologies, electrochemistry and other relevant techniques for brine utilization. Our goal is to provide valuable insights and methods for the green and efficient development of salt lake resources.

Therefore, we cordially invite you to contribute your research articles, communications or reviews to this Special Issue. Your contribution will play a significant role in advancing this crucial field and offering insights into the efficient utilization of salt lake resources.

Prof. Dr. Xiushen Ye
Prof. Dr. Dandan Gao
Prof. Dr. Shiqiang Wang
Guest Editors

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

  • lithium
  • rubidium
  • cesium
  • boron
  • potassium
  • salt lake
  • adsorption
  • extraction
  • membrane separation
  • phase separation

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Published Papers (2 papers)

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11 pages, 2615 KiB  
Article
Solid–Liquid Phase Equilibria of the Aqueous Quaternary System Rb+, Cs+, Mg2+//SO42− - H2O at T = 323.2 K
by Zhangfa Yu, Ying Zeng, Xuequn Li, Hongbo Sun, Longgang Li, Wanghai He, Peijun Chen and Xudong Yu
Separations 2024, 11(11), 309; https://doi.org/10.3390/separations11110309 - 27 Oct 2024
Viewed by 535
Abstract
Sulfate-type salt lakes constitute over half of the total salt lakes in China and are rich in rare elements, such as rubidium and cesium. However, the complex interactions between ions make the separation and extraction process quite challenging. To address this, phase equilibrium [...] Read more.
Sulfate-type salt lakes constitute over half of the total salt lakes in China and are rich in rare elements, such as rubidium and cesium. However, the complex interactions between ions make the separation and extraction process quite challenging. To address this, phase equilibrium studies were conducted on the sulfate system containing rubidium, cesium, and magnesium. Specifically, the phase equilibria of the aqueous quaternary system Rb+, Cs+, Mg2+//SO42− - H2O at 323.2 K were investigated using the isothermal dissolution method. The solubility, density, and refractive index of the system were experimentally measured. The results indicate that the system at 323.2 K belongs to a complex type with the formation of one solid solution (Rb, Cs)2SO4 and two double salts (Rb2SO4·MgSO4·6H2O, Cs2SO4·MgSO4·6H2O). The corresponding phase diagram consists of four quaternary invariant points, nine univariate curves, and six crystallization regions. Among these, the crystalline region for Cs2SO4·MgSO4·6H2O is the largest, while that for the single salt Cs2SO4 is the smallest. Moreover, the crystalline regions for the double salt and solid solutions are significantly larger than those for the single salt, highlighting the difficulty in separation of valuable single salts. A comparison of multi-temperature phase diagrams from 298.2 K to 323.2 K reveals that the crystalline form of MgSO4 changes from MgSO4·7H2O (298.2 K) to MgSO4·6H2O (323.2 K). As the temperature increases, the phase regions for Rb2SO4, Cs2SO4, (Rb, Cs)2SO4, and Cs2SO4·MgSO4·6H2O expand, while the phase region of Rb2SO4·MgSO4·6H2O contracts, indicating that the single salts (Rb2SO4, Cs2SO4) are more readily precipitated at higher temperature, which provides theoretical guidance for the future production and separation of Rb, Cs, and Mg from sulfate-type salt lakes. Full article
(This article belongs to the Special Issue Green and Efficient Separation and Extraction of Salt Lake Resources)
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13 pages, 5851 KiB  
Article
High-Efficiency Selective Adsorption of Rubidium and Cesium from Simulated Brine Using a Magnesium Ammonium Phosphate Adsorbent
by Haining Liu, Yanping Wang, Qiongyuan Zhang, Wenjie Han, Huifang Zhang and Xiushen Ye
Separations 2024, 11(9), 277; https://doi.org/10.3390/separations11090277 - 23 Sep 2024
Viewed by 579
Abstract
Rubidium and cesium are critical strategic elements, and their development and utilization are of great significance. In this study, a magnesium ammonium phosphate (MAP) adsorbent was prepared and characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) surface area analysis, and [...] Read more.
Rubidium and cesium are critical strategic elements, and their development and utilization are of great significance. In this study, a magnesium ammonium phosphate (MAP) adsorbent was prepared and characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) surface area analysis, and Fourier transform infrared spectroscopy (FTIR). The adsorption performance of the adsorbent for Rb+ and Cs+ in solution was investigated. The results showed that the adsorbent exhibited high adsorption capacities of 2.83 mol/g for Rb+ and 4.37 mol/g for Cs+. In simulated brine, the adsorbent demonstrated excellent selectivity for Cs+. Kinetic and thermodynamic studies indicated that the adsorption process followed a pseudo-second order kinetic model and Langmuir isotherm model. The primary adsorption mechanism was an ion exchange. The development of this adsorbent holds significant promise for the extraction of rubidium and cesium from liquid resources. Full article
(This article belongs to the Special Issue Green and Efficient Separation and Extraction of Salt Lake Resources)
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