Recycling of end-of-life Melamine at 1600°C for Carbon Dissolution into Liquid Iron

概要

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We produced the nano-structured graphitic materials by pyrolysis of end-of-life kitchen melamine-formaldehyde (MF) plate without externally supplied catalyst/additive at 1600°C under nitrogen flow of 2 L/min. Different types of morphologies of carbon materials were observed under the scanning electron microscopy (SEM) and transmission electron microscopy (TEM) such as, sheet, rod and porous particle. In Raman analysis, the material shows high level of crystallinity (~70% crystalline and remaining amorphous carbons) with high purity. We have applied this material in the carbon dissolution experiment with pure iron pellets under similar condition for a wide range of contact time. The carbon dissolution shows a linear relationship with contact time, and the maximum ~5.65% is determined for 45 min. The highly ordered spherical particles are assembled in the interfacial region of iron/MF. The high magnification of the spherical particle on SEM shows different types of phases containing carbon along with visible grain boundaries. The progression of carbon diffusion is found from the interface to the beneath of the surface in the polished iron pellet. The process is a promising recycling of sustainable material, end-of-life MF products for value-added advanced products as new carbon resource in steelmaking process for energy savings.