SiSAl project details

Proposal Number


Lead Partner

Norwegian University of Science and Technology (NTNU)


D2 Acceleration


D2.2 Upscaling


2021-01-03 - 2023-12-31
Welcome to
our project!
Today Silicon (Si) and High Purity Alumina (HPA) are made non-sustainably; for each tonne of Si you produce a lot more CO², plus harmful pollutants.
This problem is resolved by SisAl, by replacing carbon with secondary Al for Si production, and in parallel making a slag being a perfect precursor for HPA. If successful in upscaling, NTNU through a spin-off (licences), SiQAl & Mytilineos (HPA) and CALEF (CO² looping) will commercialise the sustainable technologies and products.
The Sisal concept comprises 3 main technologies:

  • Silicon metal and SisAl slag production using the SisAl process
  • HPA production from SisAl slag by the SiQAl process
  • Mobile CO² looping unit that can be integrated in the processing of SisAl slag for HPA production and 2 main products

And 2 main products:

  • Silicon metal (Si)
  • High purity alumina (HPA)

A new, CO² free process for production of the critical raw material silicon (“SisAl”, see figure 1a and b), using secondary materials, has been developed to large laboratory/small pilot scale and patented by NTNU under the umbrella of the Norwegian centre “CRI Metal Production”.