Leaching of Neodymium From Hard Disk Drive Magnet Waste Using Citric Acid- Design of Experiments and Optimization

Abstract

Neodymium magnet waste recycling and precious metal recovery have drawn a lot of researchers' attention because of their vital role in contemporary technology. In this work, the potential of citric acid for the leaching of neodymium from hard disk drive waste magnets has been examined using statistical approaches like full factorial design(FFD) and central composite design (CCD).The variables have been screened and conditions are optimized to obtain higher leaching. The polynomial quadratic Model proves effective to predict optimized conditions for neodymium leaching. Leachant concentration and temperature were screened as the most effective factors. Optimization conditions for the leaching process were achieved through central composite design, revealing that 2 mol/L citric acid and a temperature of 333 K provide the ideal conditions for the complete dissolution of neodymium. This extensive study contributes to sustainable materials management and resource conservation by illuminating the effective recovery of important metals from neodymium magnets. Neodymium recovery from HDD magnet waste using leaching procedure by citric acid has been reported in this work. Four operating variables were screened and leaching conditions have been optimized with the use of statistical approaches, full factorial design and central composite design. This report focuses on the use of green leachant as citric acid, performing less number of experiments through experimental design. image