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ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 14a
SUMMARY:Upcycle of carbon-containing residuals and co-products by recrystallisation in molten metals
DESCRIPTION:This work presents the melt-recrystallisation process as a possible solution for the sustainable use of carbon-containing materials, that would otherwise be burned or landfilled. Of interest are for example residuals or carbonaceous co-products from pyrolysis processes. Although these materials consist almost exclusively of carbon, they are lacking major fields of application. The melt-recrystallisation process provides a pathway towards these applications, as the low-grade carbon products can be upcycled to a graphitic carbon nano material, generally referred to as graphene nano platelets (GNP). GNP are sheets of hexagonally arranged and covalently bonded carbon atoms in µm-scale, forming stacks of about ten atomic layers. There is a wide spectrum of applications for GNP, ranging from high end electronics to corrosion protection and industrial lubricants. However, the most promising field for large scale application are composite materials, especially as additives in polymers and cement, in which GNP can induce an improvement of the mechanical properties. 
The process concept is based on dissolving defined amounts of carbon residual in molten alloys containing Fe or Ni. Afterwards the carbon is precipitated under defined conditions, forming the GNP at the melt surface. The formed GNP must then be removed from the surface of the liquid melt, to avoid prolonged growth of the crystallites into larger graphite particles. Therefore, a concept for removing the GNP from the melt surface is designed and tested. Furthermore, the influence of alloy composition, annealing time, and cooling rate on the crystal structure of the produced carbon nano material are evaluated. Analysis methods include Raman microscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy. The results indicate that indeed various types of GNP can be produced via melt-recrystallisation. Nonetheless, the separation of the produced GNP from the melt surface provides a challenge and is also affecting the product quality. 

CLASS:PUBLIC
DTSTART:20230614T094000
DTEND:20230614T100000
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