Optimization of Aluminum Utilization in Ultrasonic‐Assisted Chemical Leaching of Purified Sludge Based on Response Surface Methodology

ABSTRACT

This study employed response surface methodology to optimize the ultrasonic‐assisted chemical leaching process for the efficient extraction of aluminum from purified water sludge. Through two consecutive stages of optimizing chemical leaching parameters and ultrasound‐assisted conditions, the system determines the optimal extraction conditions and evaluates the practical application potential of aluminum recovery. The results showed that the chemical leaching effect was optimal when using 2.0 mol/L sulfuric acid, with an aluminum extraction rate of 40.15%; subsequently, through ultrasound‐assisted single‐factor experiments combined with response surface fitting optimization, the aluminum extraction rate was significantly increased to 70.32% under the conditions of 1080 W ultrasound power, 56.53 min processing time, and 51.13°C extraction temperature.