Recovery of Aluminium Metal Using Ultrasonic Technique and Production of Al–Si Hypereutectic Alloys from 6063 Alloy’s Black Dross Using Silicon Lumps and Flux

Abstract

The present work aimed to use an alternative method for the pre-treatment of the black dross samples to remove the unwanted components like nonmetallic and salt content by using the immersion method with diluted nitric acid and sulfuric acid during ultrasonic treatment, the process consists of the following three (3) unit operations: a.Immersing the black dross samples in 500 ml beaker filled with tap water, 1.43 M HNO3 and 0.735 M H2SO4 overnight after that expose the beaker with dross to ultrasonic for 4 h.b.Filtering the aluminium lumps from the tap water containing soluble and partially soluble alkali oxides and nonmetallic through sieve (d = 2 mm—mesh no. 10).c.Drying the aluminium lumps in an electric furnace at 120 °C for 2 h.