Obtención y caracterización de compuestos de aluminio/calamina a partir de subproductos industriales

Abstract

Cities in developing countries such as Bogotá, in Colombia, bury several tons of aluminum without being processed, despite the good recyclability of this material. To this is added the fact that some types of by-products have low remelting recyclability, such as This is the case of mechanical sawing chips, which are small and semi-continuous. This has to do with the 12th Sustainable Development Goal (SDG), on responsible consumption, which encourages industries to reduce waste. Furthermore, the 17th SDG says that these goals can only be achieved with a strong commitment to partnership and global cooperation. Therefore, the goal of this The project was to address this problem by evaluating the recyclability of the leftover aluminum chips of a sawing process, testing its suitability for further processing using techniques powder metallurgy. The technical approach included the development of an aluminum reinforcement with mill scale, a byproduct of iron oxide that remains after rolling at high steel temperature. For this, aluminum shavings and mill scale were ground, and the Resulting powders were characterized by SEM-EDS, XRD and laser granulometry. TO then the powders were mixed with different percentages by weight of husk, 0, 0.5, 1.0 𝑦 2.0%, were compacted in a uniaxial hydraulic press and sintered in a protective atmosphere. The iron and aluminum oxide compounds were characterized by optical microscopy, SEM and hardness. It was discovered that the iron oxide particles and the matrix of Aluminum react by means of a thermal reaction, forming different types of interfaces in depending on the amount of mill scale. Finally, it was found that the 0.5% husk of lamination is the optimal value to add, since it improves the hardness of the compound to 92.5 ± 2.5 𝐻𝑅𝐹, this taking into account that the hardness of the material at 0% addition is 90 ± 2.5 𝐻𝑅𝐹.