DETERMINATION OF THE AMOUNT OF ALUMINUM CONTENT IN ALUMINUM DROSS THROUGH X-RAY DIFFRACTION

摘要

In all aluminum smelting process occurs oxidation of the metallic surface forming dross. The dross are mainly composed of metallic aluminum, Al_2O_3, with minor trace of A1N and oxides. The aluminum quantification in dross is complicated, due to the small size of aluminum particles, furthermore its dispersion between oxides. This work considers a method to quantify the aluminum amount in white dross by means of XRay Diffraction, using the internal standard method. In this method a diffraction line from aluminum is compared with a line from the standard, in this case was used CaCO_3 (calcium carbonate). The calibration curve was made through a plot of the ratio of the weight fraction of aluminum and calcium carbonate as a function of the integrated intensity ratio of the line from Al and the line from the standard. The diffraction pattern of a sample was done from mixtures of dross and calcium carbonate, of well-known composition, then using a calibration curve were quantified the aluminum amount in dross.