HYMAG’IN is a French technology-based startup. Its main goal is to develop its activity on a larger scale and to begin its industrial adventure.


HYMAG’IN develops an industrial process for converting ferrous waste and by-products into a functional material, magnetite.

Produced in sizes smaller than a micrometer, this iron oxide has outstanding physicochemical properties that make it a highly valuable material for a wide range of applications, among which wastewater treatment and soil remediation.

Depending on the range, our magnetites measure between 30 and 500 nm. Magnetite? You said magnetic? Subjected to a magnetic field, it magnetizes and easily separates from the medium in which it is immersed.

By providing a process based on waste and by-products upcycling, HYMAG’IN promotes circular economy and makes magnetite available on a large scale.

An innovative technology

Our process is based on six years of laboratory research.

Rise of iron waste is correlated with rise of taxes, more societal pressure and an environment hazard bigger.



 HYMAG’IN is a French technology-based startup. Its main goal is to develop its activity on a larger scale and to begin its industrial adventure.



Properties of magnetite.Our magnetite adapts. We plan to offer different magnetite ranges adapted to your needs.  Our magnetite is "green"!


Soil remediation. Magnetite has the same effect in soil as it does in water. Thus metals and organic micro-pollutants can be eliminated from polluted soils.




Magnetite for water treatment and soil remediation

HYMAG’IN proposes magnetite to wastewater treatment and soil remediation operators as a novel alternative solution. Magnetite offers efficient decontamination of heavy metals (Cr, As, Se, Pb, etc.) and organic micro-pollutants (pesticides, dyes, chlorinated compounds), by combining filtration and redox degradation.

Ferrous residues upcycling

While scrap is largely recovered by steelmakers via scrap metal dealers, fine particles in the form of iron-rich dust and sludge are difficult to recover.

The upcycling of these residues represents a major challenge for three reasons:

  • The very large volumes: up to 400,000 tons per year of by-products are produced on each industrial plant.
  • The low intrinsic value of iron: less than 100€ per ton of iron ore compared to more than 10,000€ per ton of nickel.
  • A strong societal and environmental pressure: changes in regulatory standards and major risk of pollution for the local environment.


Industrial plant of waste, by-product and co-product of iron. HYMAG'IN engaged itself to up-cycle, recover, give a new value for them with the Magnetite.

A wide range of applications

Due to its numerous properties, our magnetite is able to address alternative markets listed below:

Electromagnetic shielding. Magnetite, as a ferrite, is a material known for its properties of absorption of electromagnetic waves such as radar, wifi, microwaves...

Magnetic functionalization. By introducing magnetites into a polymer-type matrix, an object can become magnetic-field sensitive.

Pigmentation. Magnetite is widely marketed as a black pigment. Colorimetry studies have made it possible to quantify the black intensity of our materials!

Catalysis. Magnetite may accelerate some chemical reactions, such as in the Haber process for the production of ammonia from nitrogen.

Source of iron. Natural micrometric-sized magnetite is a widely used iron ore.

Start-Up Challenge 2019 Nominee