HYMAG'IN | Linksium
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Incorporated startups

From waste to nanomaterials

profilePhoto   Gisela Schach
Linksium Contact Gisela Schach +33 (0)6 33 63 44 99 gisela.schach@linksium.fr
HYMAG'IN Camille Crouzet, CEO +33 (0)6 70 40 47 21 camille.crouzet@hymagin.com
150039 HYMAGIN


  • Waste recycling and ferrous products
  • Industrial production of magnetic nanoparticles
  • Wide range of applications

Key words

  • Recycling
  • Ferrous co-products
  • Hydrothermal oxidation
  • Hydrogen

Intellectual Property

  • 2 patents

Partnerships & Rewards

  • 2019 French Deeptech Innovation Competition Winner




  • CNRS
  • UGA
  • USMB

Linksium Continuum

  • Maturation
  • Incubation


  • Incorporated startups


The Hymag'in project develops a process for the industrial production of nanomaterials for high added-value applications. This process forms part of a circular economy strategy by enabling the synthesis of iron oxide nanoparticles – nanomagnetites Fe3O4 – by the recycling of ferrous waste.
The technology used by HYMAG’IN is the result of several years of research at the ISTerre laboratory (Université Grenoble Alpes, CNRS).


The process consists of the oxidation of the ferrous co-product in hydrothermal conditions: 150 to 350 °C and 20 to 100 bars.
The temperature, the pH, the chemistry in solution and the choice of input were surveyed to optimise the effectiveness of the processing and quality of the products.


The process brings a high added value to the co-products rich in ferrous iron, whose valorisation currently remains limited.
The central element of the process lies in the production of magnetite in the 10 – 500 nm range. These particles offer numerous physiochemical properties (specific surface, density, magnetism) that turn it into a product of choice for a wide range of applications. As well as magnetite, hydrogen is produced by the process.

State of progress

After the demonstration on a laboratory scale (0.5 L), a first pilot scale (2 L) today enables semi-continuous production with the injection and extraction of solid matter without shutting down the reactor (temperature and pressure). After having demonstrated the extrapolation of the process to a wide range of ferrous waste, the team is now focusing on the demonstration of the materials produced compared to the target applications.


  • Treatment of liquid effluents
  • Soil decontamination
  • Pigments and toners
  • Magnetic functionalisation of materials
  • Heterogeneous catalysis
  • Ferrofluids
  • Electromagnetic armour