Rycycling of Aluminium
Photo: Dave Plant and John Paterson
Willie Howson, in the absence of immediate Past Scottish Branch President Dr Tom Paterson welcomed President John Paterson to his first Technical Meeting of 2008. Willie presented John with his chain of office. John thanked Willie and he thanked the branch for electing him to be their President and hoped that all would enjoy his programme for 2008/09. He then went on to welcome his first speaker Dave Plant, Process Manager from Pyrotek.
Dave outlined his presentation by giving three headings: Melting, Filtration & Degassing.
He spoke of the methods they had developed in improving melting losses, the control of the melt analysis using integrated melting system, thermal drying of the scrap prior to melting which reduces the emissions due to the drying, not burning of the contaminates. He also gave an outline on the LOTUSS Remelt System, which stands for: Low Turbulence Scrap Submergence.
The advantages are low capital investment, sized to match desired scrap melt rate, high metal recovery rates, suited for continuous melting operations, easy installation, low maintenance and low operating costs.
Filtrating systems: he explained that molten Aluminium has various solid-phase inclusions such as oxides, carbides and refractory particles from the melting vessel. These contaminate the metal in its final solidification form. The Aluminium can be successfully filtered using different types of systems suitable for whatever the final material is required for.
Degassing: this can be carried out by SHUR-LOK Coupling and Shaft.
Rotor degassing is the technology process of choice to remove hydrogen and other impurities from molten aluminium. Graphite shafts and rotors of various designs are used with different mechanical drive systems to mix the process gas with the metal. The connection between shaft and drive system and the stresses and environment which the shaft is subjected to often lead to mis-aligned installation, broken threads, poor gas sealing capability, premature shaft failure, loss of productivity, and excessive down-time for shaft change out.
After a healthy question and answer session Dave was thanked for his presentation by John Paterson who gave the vote of thanks. He was also thanked for his sponsorship of the buffet after the presentation.