Caractérisation physique, mécanique et électrique de la pâte à brasquer et l'effet du vieillisement sur ses performances

Authors: Maali, Hanae
Advisor: Fafard, MarioDarvishi Alamdari, Houshang
Abstract: The ramming paste plays a fundamental role in the life of an electrolysis cell and its energy efficiency. On the one hand, it prevents the infiltration of liquid aluminum into the cell and, on the other hand, it seals the cathode blocks which protects them from damage and ultimately from failure. The aging of the coal tar pitch based ramming paste, due to the evaporation of the softeners ensuring its malleability at room temperature, is likely to influence its physical, mechanical and electrical properties. Also, during the compaction of the coal tar pitch based ramming paste, the binder present in its composition releases carcinogenic products such as polycyclic aromatic hydrocarbons, which constitutes a real danger for health. To overcome this problem, several eco-friendly ramming pastes have been developed in recent years. However, the physical properties of these new pastes and their effects on the process efficiency are not yet well known. This work aims to study the aging effect on the physical, mechanical and electrical properties of the ramming paste. In this perspective, a standard coal tar pitch based ramming paste and an eco-friendly one were investigated. The characterization of the aging effect is focused on the measurement of quantities such as apparent density, mass loss, volumetric change, Young’s modulus, Poisson’s ratio, compressive and tensile strength as well as electrical resistivity. The results of this study reveal that the aging of the ramming pastes mainly affects the mass loss, the Poisson’s ratio and the mechanical properties of the green paste.
Document Type: Mémoire de maîtrise
Issue Date: 2018
Open Access Date: 13 February 2019
Grantor: Université Laval
Collection:Thèses et mémoires

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