Bulk density was measured by weighing in a vessel of known volume (height = 230 mm, diameter = 115 mm [25]. In order to determine the metal content the samples were melted in a graphite crucible at 750 °C with a mixture of 72% NaCl, 26% KCl and 2% CaF2. After cooling, crushing, and washing, the spent salt flux was screened and particles above 0.5 mm diameter were considered to be metal. The residue was analyzed by atomic absorption spectroscopy (AAS), using an analyzer type Analytic Yena Nova 300. For leaching tests and chemical analysis were taken additional dross samples. The leaching test was carried out by mixing a 100 g sample with 1000 ml of distilled water to determine the salt content of the dross [26]. Also, a 100 g sample was mixed with distilled water and stirred in a closed vessel to measure the gas evolution.