SAND FRACTION STUDY FOR THE PRODUCTION OF ALUMINUM ALLOY COATINGS BY PLASMA ASSISTED ELETRIALTIC OXIDATION

Reference	Presenter	Authors (Institution)	Abstract
06-084	Renan Fernandes Moraes	Moraes, R.F.(Universidade Estadual Paulista (UNESP), Instituto de Ciência e Tecnologia, Sorocaba); Souza, C.d.(Universidade Estadual Paulista (UNESP), Instituto de Ciência e Tecnologia, Sorocaba); Munhoz Junior, A.H.(Universidade Presbiteriana Mackenzie); Rangel, E.C.(Universidade Estadual Paulista); Cruz, N.C.(Universidade Estadual Paulista); Antunes, M.L.(Universidade Estadual Paulista (UNESP), Instituto de Ciência e Tecnologia, Sorocaba);	The generation and non-solution for the accumulation of waste from the mining industry has always been considered a potential risk related to contamination of the environment, soil, air and water. Red mud is a residue obtained from the processing of bauxite for the production of alumina. It is a residue generated in large scale, being the current and most common destination, the lagoons of disposal. Knowing the properties of this residue can provide new applications and destinations. For this, in this work, were determined physical properties of the particulates obtained by physical separation / sieving of the material, such as granulometry and specific mass. It’s chemical characteristics were determined through X-ray fluorescence and thermal analysis. The purpose of this separation was to obtain results of the crude red mud and its sand fraction. With the material obtained by this separation, 1200 red aluminum alloy mud coatings were produced using PEO plasma electrolytic oxidation technology. The electrolytic solution was prepared with the crude slurry and the sand fraction with distilled water at 5g/L concentrations. The electrolytic plasma was performed by a potential difference of 600V, frequency of 200Hz, with a deposition time of 300s. The coatings produced were analyzed for their morphology by Scanning Electron Microscopy and elemental chemical composition by EDS. The specific mass of the sand fraction of the red mud is (2.43 ± 0.22) g/cm3 and has a composition of 30.86% Fe2O3, 30.51% Al2O3, 19.88% SiO2, 36% Na2O, 4.72% CaO and 2.97% TiO2. The Scanning Electron Microscopy analysis of the coatings shows a surface composed of pores and coalescence areas, predominantly aluminum, Si and O.
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