PapersFlow Research Brief
Extraction and Separation Processes
Research Guide
What is Extraction and Separation Processes?
Extraction and separation processes are engineering methods that isolate and recover specific components from mixtures using physical and chemical principles such as solubility differences, phase partitioning, and selective binding, often applied in battery recycling, rare earth recovery, and hydrometallurgical operations.
The field encompasses 139,344 works focused on recycling lithium-ion batteries, recovering rare earth elements, and sustainable metal recovery technologies. Key approaches include hydrometallurgical processes and deep eutectic solvents for efficient separation. These processes address circular economy needs amid global supply concerns and resource depletion.
Topic Hierarchy
Research Sub-Topics
Hydrometallurgical Recycling of Lithium-Ion Batteries
This sub-topic focuses on leaching, solvent extraction, and precipitation techniques for recovering lithium, cobalt, and nickel from spent batteries. Researchers optimize processes for high yield and low environmental impact.
Rare Earth Elements Recovery from Waste Streams
This sub-topic studies solvent extraction, ion exchange, and bioleaching for REE separation from electronic waste and magnets. Studies address selectivity challenges amid supply chain vulnerabilities.
Environmental Impact Assessment of Battery Recycling
This sub-topic evaluates life-cycle emissions, toxicity, and water usage in recycling processes versus landfilling. Researchers develop LCA models comparing global recycling scenarios.
Circular Economy Frameworks for Metal Recovery
This sub-topic integrates recycling into battery production cycles, modeling closed-loop systems for EV metals. Studies explore economic viability and policy incentives for scale-up.
Bioleaching Processes for Battery Metal Extraction
This sub-topic investigates microbial leaching using bacteria and fungi for eco-friendly metal recovery from LIBs. Researchers enhance kinetics through bioreactor designs and genetic engineering.
Why It Matters
Extraction and separation processes enable recovery of critical materials from waste streams, supporting battery recycling and rare earth supply chains. Harper et al. (2019) in "Recycling lithium-ion batteries from electric vehicles" outlined methods to process end-of-life batteries, preventing resource loss. Recent developments include Phoenix Tailings receiving $1.6 million to develop ligands for capturing critical minerals from brines, and Avalon recovering 15 rare earth elements using Engina’s Hybrid Supercritical Refining process. USA Rare Earth plans to extract 40,000 metric tons per day from the Round Top deposit by 2028. These applications reduce environmental impact and secure supplies for electronics and clean energy technologies.
Reading Guide
Where to Start
"Sequential extraction procedure for the speciation of particulate trace metals" by Tessier et al. (1979), as it provides a foundational, highly cited (11,660 times) method for understanding metal partitioning applicable to hydrometallurgical separations.
Key Papers Explained
Tessier et al. (1979) "Sequential extraction procedure for the speciation of particulate trace metals" established fractionation techniques, cited by later works like Abbott et al. (2004) "Deep Eutectic Solvents Formed between Choline Chloride and Carboxylic Acids", which advanced solvent-based extractions. Sholl and Lively (2016) "Seven chemical separations to change the world" built on these by identifying industrial priorities, while Harper et al. (2019) "Recycling lithium-ion batteries from electric vehicles" applied them to battery recycling, connecting fundamentals to practical recovery.
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Recent preprints emphasize green extraction from biomasses and reactive extraction for acids, alongside news of ligand development for brines (Phoenix Tailings, $1.6M funding) and supercritical refining recovering 15 rare earths (Avalon/Engina). ARPA-E funds bio-extraction from wastewaters (UC Davis, $3M), targeting scalable rare earth processes from US deposits like Round Top (40,000 tons/day planned).
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | Sequential extraction procedure for the speciation of particul... | 1979 | Analytical Chemistry | 11.7K | ✕ |
| 2 | Nano-sized transition-metal oxides as negative-electrode mater... | 2000 | Nature | 7.9K | ✕ |
| 3 | Phospho‐olivines as Positive‐Electrode Materials for Rechargea... | 1997 | Journal of The Electro... | 7.6K | ✕ |
| 4 | Sodium-ion batteries: present and future | 2017 | Chemical Society Reviews | 4.8K | ✓ |
| 5 | The ecoinvent database version 3 (part I): overview and method... | 2016 | The International Jour... | 4.8K | ✕ |
| 6 | Seven chemical separations to change the world | 2016 | Nature | 4.3K | ✓ |
| 7 | Deep Eutectic Solvents Formed between Choline Chloride and Car... | 2004 | Journal of the America... | 4.0K | ✕ |
| 8 | Ageing mechanisms in lithium-ion batteries | 2005 | Journal of Power Sources | 3.7K | ✕ |
| 9 | Die Gesetze der Krystallochemie | 1926 | Die Naturwissenschaften | 3.6K | ✕ |
| 10 | Recycling lithium-ion batteries from electric vehicles | 2019 | Nature | 3.3K | ✓ |
In the News
USA Rare Earth Announces Letter of Intent with the U.S. ...
* Extract 40,000 metric tons per day of rare earth and critical mineral feedstock from USAR’s Round Top deposit, which is expected to begin commercial production in 2028;
Phoenix Tailings Selected to Receive $1.6 Million in ...
As part of this initiative, Phoenix Tailings is developing specialized chemical compounds (“ligands”) that form temperature-stable, volatile complexes with critical minerals in dilute brine streams...
Avalon and Engina Successfully Recovered 15 Rare Earth ...
assessment confirming that Engina’s proprietary Hybrid Supercritical Refining (HSR) process, a next-generation rare earth extraction technology that can deliver breakthrough performance for Avalon’...
Energy Department Announces $25 Million to Extract Critical ...
Skip to main content
Extracting rare earth elements from U.S. wastewaters
The U.S. Department of Energy’s Advanced Research Projects Agency-Energy (ARPA‑E) awarded UC Davis researchers a $3 million grant to develop a bio‑based process that selectively captures rare earth...
Code & Tools
Python audio source separation library created by the Interactive Audio Lab at Northwestern University. It stands for Northwestern University Sourc...
The **CADET** core simulator is a very powerful numerical engine that can simulate a large variety of physico-chemical models used in chromatograph...
## Repository files navigation **Status:** Expect regular updates and bug fixes. # OpenAI Gym environment for solvent extraction process design a...
Interface Extraction is a small but very useful feature of the ETAI library. It can **automatically extract an interface** (also called **mirror in...
DOI **`audioflux`**is a deep learning tool library for audio and music analysis, feature extraction. It supports dozens of
Recent Preprints
Green Extraction Techniques | Springer Nature Link
The increasing interest in natural bioactive compounds is pushing the development of new extraction processes that may allow their recovery from a variety of different natural matrices and biomasse...
(PDF) Extraction: An important tool in the pharmaceutical field
traditional medicinal herbs, are not available to them 1. In Extraction the mixtur e of substances is d issociated, by dissolving each component with one or other solvents which yields two phases –...
Separation Technology: Essential Techniques for Industry and Research.
Extraction processes separate components based on their solubility in two immiscible phases, usually liquids. Liquid-liquid extraction is often employed in hydrometallurgy, pharmaceuticals, and ...
Bioactive Compounds Extraction From Moringa oleifera ...
*Moringa oleifera*leaves are a rich source of bioactive compounds with antioxidant and anti‐inflammatory properties. However, the efficient extraction of these compounds depends on optimized proces...
Reactive Extraction of Acetic Acid from Aqueous Sodium ...
costly and energy-intensive. The current study focuses on exploring a synergetic reactive extraction methodology to extract acetic acid from aqueous sodium acetate waste. Physical extraction expe...
Latest Developments
Recent developments in extraction and separation processes research include the upcoming International Congress on Separation and Purification Technology in September 2026, focusing on advances in the field (Elsevier). Additionally, innovations in gold and rare earth element separation techniques are rapidly evolving, with over 70% of mining sites expected to adopt advanced methods by 2026 to improve efficiency (farmonaut.com). Breakthroughs in membrane-based separation, such as a novel MOF membrane for helium separation demonstrating high selectivity and stability, are also notable (nature.com). Furthermore, research on electrochemical and liquid-liquid extraction methods, including redox-mediated electrochemical separation for critical metals and digital tools for process design, are advancing the field (springernature.com, rsc.org).
Sources
Frequently Asked Questions
What is the sequential extraction procedure for trace metals?
Tessier et al. (1979) in "Sequential extraction procedure for the speciation of particulate trace metals" developed a method using stepwise chemical treatments to fractionate metals in sediments into exchangeable, carbonate-bound, Fe/Mn oxide-bound, organic, and residual phases. This procedure reveals metal bioavailability and mobility. It has been cited 11,660 times for environmental analysis.
How do deep eutectic solvents aid separations?
Abbott et al. (2004) in "Deep Eutectic Solvents Formed between Choline Chloride and Carboxylic Acids: Versatile Alternatives to Ionic Liquids" showed that mixtures of choline chloride and carboxylic acids form low-melting solvents tunable by acid structure. These solvents offer alternatives to ionic liquids for extractions due to simple phase behavior modeled by mole fractions. They enable sustainable separations in hydrometallurgy.
What role do extraction processes play in lithium-ion battery recycling?
Harper et al. (2019) in "Recycling lithium-ion batteries from electric vehicles" detailed hydrometallurgical and pyrometallurgical routes to recover lithium, cobalt, and nickel from spent batteries. These processes support circular economy goals by minimizing waste. The paper has 3,250 citations reflecting its impact on electric vehicle sustainability.
Which chemical separations are highlighted for industrial impact?
Sholl and Lively (2016) in "Seven chemical separations to change the world" identified propylene/propane separation, helium recovery, and CO2 capture as key challenges addressable by membranes and adsorbents. Improved processes could lower energy use in petrochemicals and gas processing. The work has 4,297 citations.
How do phospho-olivines function in lithium extraction?
Padhi et al. (1997) in "Phospho‐olivines as Positive‐Electrode Materials for Rechargeable Lithium Batteries" demonstrated reversible lithium extraction from LiFePO4 at 3.5 V vs. lithium. This provides an inexpensive, nontoxic cathode material. The paper has 7,642 citations.
What are current methods for rare earth recovery?
Avalon and Engina recovered 15 rare earth elements using Hybrid Supercritical Refining, a process confirmed for Nechalacho deposits. UC Davis received $3 million from ARPA-E for bio-based extraction from wastewaters. These target sustainable recovery from mine wastes.
Open Research Questions
- ? How can ligands be optimized for selective capture of rare earth elements from dilute brines, as in Phoenix Tailings' approach?
- ? What process conditions maximize bioactive compound yield and stability from Moringa oleifera leaves?
- ? How effective is synergetic reactive extraction with MIBK and xylene for acetic acid from sodium acetate waste?
- ? Which supercritical refining parameters achieve breakthrough rare earth separation in Hybrid Supercritical Refining?
- ? Can bio-based processes scale for rare earth extraction from acidic mine-influenced waters?
Recent Trends
Growth in sustainable methods includes green extraction techniques for bioactives (Springer Nature, 2025) and reactive extraction of acetic acid using MIBK/xylene from waste (recent preprint).
News reports $25M DOE funding for critical minerals, $3M ARPA-E for wastewater rare earth extraction (UC Davis), and commercial plans for 40,000 metric tons/day from Round Top (USA Rare Earth, 2028).
Phoenix Tailings advanced ligands for brines ($1.6M), signaling shift to selective, low-energy recoveries amid 139,344 works.
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