Periodic Reporting for period 1 - GYROMAGS (Green Recycling Route for Sm-Co Permanent Magnet Swarf)
Reporting period: 2022-06-01 to 2024-05-31
The GYROMAGS project represents a significant advancement in the field of critical raw materials recycling, specifically focusing on samarium-cobalt (Sm-Co) permanent magnets. This project's importance lies in its multifaceted approach to addressing crucial environmental, economic, and technological challenges:
1. Environmental Sustainability:
The project's primary goal of developing a green recycling route for Sm-Co magnet swarf directly contributes to reducing the environmental impact of rare earth element production. By recycling end-of-life magnets, the project helps minimize the need for primary mining, which is often associated with significant environmental degradation and high energy consumption.
2. Critical Raw Materials Conservation:
Samarium and cobalt are classified as critical raw materials by the European Union due to their economic importance and supply risk. The GYROMAGS project's success in recycling these materials aligns with the EU's strategy to reduce dependence on imported critical raw materials, enhancing resource security.
3. Technological Innovation:
The project developed and optimized novel processes for magnet recycling:
a) Pre-treatment Process: A comprehensive approach involving decanting, low-temperature treatment, hand-grinding, and magnetic separation reduced carbon content from >5 wt% to 0.79 wt% on average.
b) Pyrolysis Optimization: The project achieved a carbon content reduction to 0.21 wt% at 600°C, balancing carbon reduction and samarium retention. This represents a significant advancement in purification techniques for rare earth magnets.
c) Arc-Melting Process: This step further purified and consolidated the recycled material, producing Sm-Co alloy buttons suitable for reuse in magnet manufacturing.
4. Scientific Advancements:
The project contributed to the scientific understanding of Sm-Co alloy behavior during recycling processes. For instance, the observation of samarium evaporation at higher temperatures (750°C) provides valuable insights for future recycling process optimizations.
5. Circular Economy Contribution:
By demonstrating the feasibility of producing reusable Sm-Co alloy from end-of-life magnets, GYROMAGS supports the transition to a circular economy model in the electronics and renewable energy sectors.
6. Industrial Relevance:
Collaborations with industry partners like Magneti Ljubljana demonstrate the project's potential for real-world application. This bridge between academic research and industrial needs is crucial for the adoption of sustainable practices in magnet production.
7. Policy Implications:
The project's outcomes provide valuable evidence for policymakers, supporting the development of regulations and incentives to promote the recycling of critical raw materials. This aligns with the European Green Deal and the EU's circular economy action plan.
8. Educational Value:
The project's comprehensive approach, from fundamental research to practical application, offers significant educational value. It provides a model for interdisciplinary research in materials science, environmental engineering, and sustainable technology development.
9. Future Research Directions:
While challenges were encountered, particularly in the electrochemical reduction phase, the project laid the groundwork for future research. The insights gained, especially in electrode manufacturing and material characterization, provide a solid foundation for further advancements in rare earth magnet recycling.
In conclusion, the GYROMAGS project not only addresses immediate technological challenges in Sm-Co magnet recycling but also contributes to broader goals of sustainability, resource efficiency, and technological innovation. Its multidisciplinary approach and industrial collaboration make it a significant step towards a more sustainable and circular economy in the critical raw materials sector.
1. Environmental Sustainability:
The project's primary goal of developing a green recycling route for Sm-Co magnet swarf directly contributes to reducing the environmental impact of rare earth element production. By recycling end-of-life magnets, the project helps minimize the need for primary mining, which is often associated with significant environmental degradation and high energy consumption.
2. Critical Raw Materials Conservation:
Samarium and cobalt are classified as critical raw materials by the European Union due to their economic importance and supply risk. The GYROMAGS project's success in recycling these materials aligns with the EU's strategy to reduce dependence on imported critical raw materials, enhancing resource security.
3. Technological Innovation:
The project developed and optimized novel processes for magnet recycling:
a) Pre-treatment Process: A comprehensive approach involving decanting, low-temperature treatment, hand-grinding, and magnetic separation reduced carbon content from >5 wt% to 0.79 wt% on average.
b) Pyrolysis Optimization: The project achieved a carbon content reduction to 0.21 wt% at 600°C, balancing carbon reduction and samarium retention. This represents a significant advancement in purification techniques for rare earth magnets.
c) Arc-Melting Process: This step further purified and consolidated the recycled material, producing Sm-Co alloy buttons suitable for reuse in magnet manufacturing.
4. Scientific Advancements:
The project contributed to the scientific understanding of Sm-Co alloy behavior during recycling processes. For instance, the observation of samarium evaporation at higher temperatures (750°C) provides valuable insights for future recycling process optimizations.
5. Circular Economy Contribution:
By demonstrating the feasibility of producing reusable Sm-Co alloy from end-of-life magnets, GYROMAGS supports the transition to a circular economy model in the electronics and renewable energy sectors.
6. Industrial Relevance:
Collaborations with industry partners like Magneti Ljubljana demonstrate the project's potential for real-world application. This bridge between academic research and industrial needs is crucial for the adoption of sustainable practices in magnet production.
7. Policy Implications:
The project's outcomes provide valuable evidence for policymakers, supporting the development of regulations and incentives to promote the recycling of critical raw materials. This aligns with the European Green Deal and the EU's circular economy action plan.
8. Educational Value:
The project's comprehensive approach, from fundamental research to practical application, offers significant educational value. It provides a model for interdisciplinary research in materials science, environmental engineering, and sustainable technology development.
9. Future Research Directions:
While challenges were encountered, particularly in the electrochemical reduction phase, the project laid the groundwork for future research. The insights gained, especially in electrode manufacturing and material characterization, provide a solid foundation for further advancements in rare earth magnet recycling.
In conclusion, the GYROMAGS project not only addresses immediate technological challenges in Sm-Co magnet recycling but also contributes to broader goals of sustainability, resource efficiency, and technological innovation. Its multidisciplinary approach and industrial collaboration make it a significant step towards a more sustainable and circular economy in the critical raw materials sector.
Pre-treatment Process
The comprehensive pre-treatment process was designed to address the complex nature of magnet swarf contamination:
1. Decanting:
- This initial step removes excess oil and emulsions that accumulate during the grinding process of magnets.
- It's crucial for reducing the overall organic content before further processing.
2. Low-temperature Treatment:
- Conducted at 50°C for 3 hours with a 5°C/min heating rate.
- This gentle heating helps volatilize remaining oils and moisture without causing significant oxidation of the metal particles.
- The slow heating rate ensures uniform treatment throughout the sample.
3. Hand-grinding:
- Using a mortar and pestle to achieve finer particle size.
- This step breaks down agglomerates, increasing the surface area for subsequent treatments.
- It also helps in exposing trapped contaminants for more effective removal.
4. Magnetic Separation:
- Utilizes the magnetic properties of Sm-Co to separate it from non-magnetic impurities.
- This step is crucial for removing debris from grinding wheels and other non-magnetic contaminants.
The effectiveness of this pre-treatment is evident in the significant reduction of carbon content from >5 wt% to an average of 0.79 wt%. This represents the removal of over 84% of the carbon-based contaminants, a crucial step for the subsequent processes.
Pyrolysis Optimization
The pyrolysis process was meticulously optimized to further purify the material:
1. Vacuum Environment:
- Conducted in a high vacuum of 1*10^-7 mbar.
- This prevents oxidation of the metal particles during heating.
2. Temperature Optimization:
- Tested at 450°C, 600°C, and 750°C to determine the optimal conditions.
- 600°C was found to be the ideal temperature, balancing carbon reduction and samarium retention.
- At 600°C, carbon content was reduced to 0.21 wt%, a further 73% reduction from the pre-treatment stage.
- While 750°C achieved the lowest carbon content (0.15 wt%), it led to significant samarium loss due to evaporation, highlighting the delicate balance in processing rare earth materials.
This optimization demonstrates the project's ability to fine-tune processes for maximum efficiency while preserving the valuable rare earth content.
Arc-Melting Process
The arc-melting stage represents the final purification and consolidation step:
1. Sample Preparation:
- Pyrolyzed powder was pressed into tablets (200 MPa for 30 seconds).
- This compaction improves the handling and melting characteristics of the material.
2. Arc-Melting:
- Conducted under an argon atmosphere to prevent oxidation.
- The extreme temperatures (up to 3500°C) achieved during arc-melting allow for the separation of remaining impurities.
3. Resultant Structure:
- Formation of a thin Sm2O3 layer (average thickness 180 μm) on the surface.
- This oxide layer formation is a common challenge in rare earth processing and requires careful management.
- The core alloy exhibited a complex dendrite-like microstructure, indicating the successful melting and recrystallization of the Sm-Co alloy.
The arc-melting process demonstrates the project's ability to produce a consolidated alloy suitable for reuse in magnet production, a key achievement in closing the recycling loop for these critical materials.
Material Characterization
The extensive characterization performed provides crucial insights into the recycled material's properties:
1. SEM with EDS:
- Revealed the detailed microstructure and elemental distribution within the recycled alloy.
- Identified varying compositions of Fe, Co, Sm, Cu, and Zr across different phases.
2. XRD Analysis:
- Confirmed the presence of Fe0.33Co0.67 and Fe9Co7 phases.
- This phase identification is crucial for understanding the magnetic properties of the recycled material.
3. Elemental Analysis:
- Provided precise measurements of carbon and oxygen content throughout the process.
- Critical for tracking the effectiveness of each purification step.
The comprehensive characterization demonstrates the project's commitment to understanding the fundamental properties of the recycled material, ensuring its suitability for reuse in high-performance applications.
The comprehensive pre-treatment process was designed to address the complex nature of magnet swarf contamination:
1. Decanting:
- This initial step removes excess oil and emulsions that accumulate during the grinding process of magnets.
- It's crucial for reducing the overall organic content before further processing.
2. Low-temperature Treatment:
- Conducted at 50°C for 3 hours with a 5°C/min heating rate.
- This gentle heating helps volatilize remaining oils and moisture without causing significant oxidation of the metal particles.
- The slow heating rate ensures uniform treatment throughout the sample.
3. Hand-grinding:
- Using a mortar and pestle to achieve finer particle size.
- This step breaks down agglomerates, increasing the surface area for subsequent treatments.
- It also helps in exposing trapped contaminants for more effective removal.
4. Magnetic Separation:
- Utilizes the magnetic properties of Sm-Co to separate it from non-magnetic impurities.
- This step is crucial for removing debris from grinding wheels and other non-magnetic contaminants.
The effectiveness of this pre-treatment is evident in the significant reduction of carbon content from >5 wt% to an average of 0.79 wt%. This represents the removal of over 84% of the carbon-based contaminants, a crucial step for the subsequent processes.
Pyrolysis Optimization
The pyrolysis process was meticulously optimized to further purify the material:
1. Vacuum Environment:
- Conducted in a high vacuum of 1*10^-7 mbar.
- This prevents oxidation of the metal particles during heating.
2. Temperature Optimization:
- Tested at 450°C, 600°C, and 750°C to determine the optimal conditions.
- 600°C was found to be the ideal temperature, balancing carbon reduction and samarium retention.
- At 600°C, carbon content was reduced to 0.21 wt%, a further 73% reduction from the pre-treatment stage.
- While 750°C achieved the lowest carbon content (0.15 wt%), it led to significant samarium loss due to evaporation, highlighting the delicate balance in processing rare earth materials.
This optimization demonstrates the project's ability to fine-tune processes for maximum efficiency while preserving the valuable rare earth content.
Arc-Melting Process
The arc-melting stage represents the final purification and consolidation step:
1. Sample Preparation:
- Pyrolyzed powder was pressed into tablets (200 MPa for 30 seconds).
- This compaction improves the handling and melting characteristics of the material.
2. Arc-Melting:
- Conducted under an argon atmosphere to prevent oxidation.
- The extreme temperatures (up to 3500°C) achieved during arc-melting allow for the separation of remaining impurities.
3. Resultant Structure:
- Formation of a thin Sm2O3 layer (average thickness 180 μm) on the surface.
- This oxide layer formation is a common challenge in rare earth processing and requires careful management.
- The core alloy exhibited a complex dendrite-like microstructure, indicating the successful melting and recrystallization of the Sm-Co alloy.
The arc-melting process demonstrates the project's ability to produce a consolidated alloy suitable for reuse in magnet production, a key achievement in closing the recycling loop for these critical materials.
Material Characterization
The extensive characterization performed provides crucial insights into the recycled material's properties:
1. SEM with EDS:
- Revealed the detailed microstructure and elemental distribution within the recycled alloy.
- Identified varying compositions of Fe, Co, Sm, Cu, and Zr across different phases.
2. XRD Analysis:
- Confirmed the presence of Fe0.33Co0.67 and Fe9Co7 phases.
- This phase identification is crucial for understanding the magnetic properties of the recycled material.
3. Elemental Analysis:
- Provided precise measurements of carbon and oxygen content throughout the process.
- Critical for tracking the effectiveness of each purification step.
The comprehensive characterization demonstrates the project's commitment to understanding the fundamental properties of the recycled material, ensuring its suitability for reuse in high-performance applications.
The GYROMAGS project's achievements in reducing carbon content and developing a scalable recycling process for rare earth magnets represent a significant leap beyond the current state-of-the-art. This section can be expanded and rewritten with a greater emphasis on the importance and challenges of carbon removal, as well as its implications for the broader REE value chain in the EU:
Beyond State-of-the-Art Achievements
Unprecedented Carbon Reduction
The project's achievement of 0.15 wt% carbon content in recycled rare earth magnets is a groundbreaking advancement in purification techniques. This level of carbon reduction is particularly challenging due to the small size of carbon atoms, which can easily infiltrate and remain trapped in the crystal structure of rare earth elements. The difficulty lies in selectively removing these minute carbon impurities without affecting the valuable rare earth content.
The significance of this achievement cannot be overstated. Carbon impurities, even in small amounts, can significantly degrade the magnetic properties of REE-based permanent magnets. By developing a process that can reduce carbon content to such low levels, GYROMAGS has potentially unlocked a new realm of performance for recycled magnets, bringing them closer to the quality of primary-sourced materials.
Scalable and Integrated Process Development
The multi-stage process developed by GYROMAGS, encompassing pre-treatment, pyrolysis, and arc-melting, represents a holistic approach to REE magnet recycling. This integrated process is designed with industrial scalability in mind, addressing a critical gap in the EU's REE value chain.
The scalability of this process is crucial for addressing the growing demand for rare earth elements in the EU. By providing a viable method for large-scale recycling, GYROMAGS offers a pathway to reduce the EU's dependence on imported primary REEs, thereby enhancing resource security and resilience.
Circular Economy Feasibility Demonstration
Successfully producing a reusable alloy from end-of-life magnets is a tangible demonstration of the circular economy concept for critical materials. This achievement is particularly significant in the context of REEs, which have traditionally been challenging to recycle effectively.
The demonstration of this closed-loop recycling process addresses major flaws in the design of REE value chains throughout the EU. It shifts the paradigm from a linear "take-make-dispose" model to a circular one, where valuable materials are kept in use for as long as possible. This approach not only conserves resources but also reduces the environmental impact associated with primary REE mining and processing.
Environmental and Economic Impact
The potential to significantly reduce reliance on primary rare earth mining addresses both environmental concerns and supply chain vulnerabilities. This is particularly important in the EU context, where there is limited domestic REE production. By developing an efficient recycling process, GYROMAGS contributes to:
1. Reducing the environmental footprint associated with REE production.
2. Mitigating supply chain risks and price volatilities.
3. Creating new economic opportunities within the EU's recycling and high-tech manufacturing sectors.
Integration with Product Design and Value Chain Considerations
The project's findings highlight the need to consider recycling and material recovery at the design stage of products incorporating REE-based permanent magnets. This forward-thinking approach addresses a major flaw in current value chains, where end-of-life considerations are often an afterthought.
By demonstrating the feasibility of high-purity REE recovery, GYROMAGS emphasizes the importance of designing products for easier disassembly and material separation. This could lead to a paradigm shift in how manufacturers approach the use of REEs, potentially influencing product design across various industries, from consumer electronics to renewable energy technologies.
Alignment with EU Strategies and Policy Implications
The GYROMAGS project directly supports EU goals for circular economy and critical raw materials strategy. By demonstrating practical solutions to pressing challenges, it provides valuable input for policymakers and industry leaders. The project's outcomes could influence:
1. Regulations on product design and end-of-life management.
2. Incentives for the adoption of recycling technologies.
3. Investment in research and development for sustainable material use.
In conclusion, the GYROMAGS project has not only achieved its technical objectives but has also laid the groundwork for a paradigm shift in how we approach the lifecycle of rare earth magnets. By addressing the challenging issue of carbon removal and developing a scalable, integrated recycling process, the project offers a blueprint for a more sustainable and secure REE value chain in the EU. The insights gained and processes developed have the potential to revolutionize the recycling of these critical materials, contributing significantly to sustainability, resource security, and technological innovation in the EU and beyond.
Beyond State-of-the-Art Achievements
Unprecedented Carbon Reduction
The project's achievement of 0.15 wt% carbon content in recycled rare earth magnets is a groundbreaking advancement in purification techniques. This level of carbon reduction is particularly challenging due to the small size of carbon atoms, which can easily infiltrate and remain trapped in the crystal structure of rare earth elements. The difficulty lies in selectively removing these minute carbon impurities without affecting the valuable rare earth content.
The significance of this achievement cannot be overstated. Carbon impurities, even in small amounts, can significantly degrade the magnetic properties of REE-based permanent magnets. By developing a process that can reduce carbon content to such low levels, GYROMAGS has potentially unlocked a new realm of performance for recycled magnets, bringing them closer to the quality of primary-sourced materials.
Scalable and Integrated Process Development
The multi-stage process developed by GYROMAGS, encompassing pre-treatment, pyrolysis, and arc-melting, represents a holistic approach to REE magnet recycling. This integrated process is designed with industrial scalability in mind, addressing a critical gap in the EU's REE value chain.
The scalability of this process is crucial for addressing the growing demand for rare earth elements in the EU. By providing a viable method for large-scale recycling, GYROMAGS offers a pathway to reduce the EU's dependence on imported primary REEs, thereby enhancing resource security and resilience.
Circular Economy Feasibility Demonstration
Successfully producing a reusable alloy from end-of-life magnets is a tangible demonstration of the circular economy concept for critical materials. This achievement is particularly significant in the context of REEs, which have traditionally been challenging to recycle effectively.
The demonstration of this closed-loop recycling process addresses major flaws in the design of REE value chains throughout the EU. It shifts the paradigm from a linear "take-make-dispose" model to a circular one, where valuable materials are kept in use for as long as possible. This approach not only conserves resources but also reduces the environmental impact associated with primary REE mining and processing.
Environmental and Economic Impact
The potential to significantly reduce reliance on primary rare earth mining addresses both environmental concerns and supply chain vulnerabilities. This is particularly important in the EU context, where there is limited domestic REE production. By developing an efficient recycling process, GYROMAGS contributes to:
1. Reducing the environmental footprint associated with REE production.
2. Mitigating supply chain risks and price volatilities.
3. Creating new economic opportunities within the EU's recycling and high-tech manufacturing sectors.
Integration with Product Design and Value Chain Considerations
The project's findings highlight the need to consider recycling and material recovery at the design stage of products incorporating REE-based permanent magnets. This forward-thinking approach addresses a major flaw in current value chains, where end-of-life considerations are often an afterthought.
By demonstrating the feasibility of high-purity REE recovery, GYROMAGS emphasizes the importance of designing products for easier disassembly and material separation. This could lead to a paradigm shift in how manufacturers approach the use of REEs, potentially influencing product design across various industries, from consumer electronics to renewable energy technologies.
Alignment with EU Strategies and Policy Implications
The GYROMAGS project directly supports EU goals for circular economy and critical raw materials strategy. By demonstrating practical solutions to pressing challenges, it provides valuable input for policymakers and industry leaders. The project's outcomes could influence:
1. Regulations on product design and end-of-life management.
2. Incentives for the adoption of recycling technologies.
3. Investment in research and development for sustainable material use.
In conclusion, the GYROMAGS project has not only achieved its technical objectives but has also laid the groundwork for a paradigm shift in how we approach the lifecycle of rare earth magnets. By addressing the challenging issue of carbon removal and developing a scalable, integrated recycling process, the project offers a blueprint for a more sustainable and secure REE value chain in the EU. The insights gained and processes developed have the potential to revolutionize the recycling of these critical materials, contributing significantly to sustainability, resource security, and technological innovation in the EU and beyond.