Wang Tian, Wang Yuanru, Ji Hongtu, Zhang Yimin, Song Deyang, Lenh Phan Duc, Le Thiquynhxuan, Zhang Libo
State Key Laboratory of Complex Non-ferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093 Yunnan, China; Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093 Yunnan, China.
Henan Jinli Gold and Lead Group Co., Ltd, Jiyuan 454650 Henan, China.
Ultrason Sonochem. 2025 Aug;119:107406. doi: 10.1016/j.ultsonch.2025.107406. Epub 2025 May 28.
Cadmium (Cd) is a toxic metal with significant recycling value. Our previous work demonstrated that ultrasonic-enhanced Cd replacement by aluminum (Al) powder outperforms non-sonicated methods, yet challenges remain in treating high-concentration Cd solutions. This study introduces an ultrasonic pre-treatment for Al powder to enhance Cd replacement in high-concentration solutions. The effects of pre-treatment time, temperature, pH, and ultrasonic power density on the replacement efficiency were systematically investigated. Under optimized conditions, the Cd replacement degree increased by 20.7 % compared to non-pre-treated Al and 3.87 % compared to conventionally pre-treated Al, reaching 97.53 %. Ultrasound corrodes the Al powder's oxide film, reducing its inhibition on electron release and creating a favorable atmosphere for enhanced replacement. The specific surface area of ultrasonically pre-treated Al powder increased by 35 % and 92 % compared to conventionally pre-treated and non-pre-treated Al, respectively, enhancing Cd reaction. This process enables efficient treatment of higher Cd concentrations (300 % increase) with lower Al powder consumption (40 % decrease), making it more suitable for industrial-scale, efficient, clean, and sustainable production.
镉（Cd）是一种具有重要回收价值的有毒金属。我们之前的工作表明，超声强化铝（Al）粉置换镉的效果优于非超声处理方法，但在处理高浓度镉溶液时仍存在挑战。本研究引入了对铝粉进行超声预处理的方法，以提高在高浓度溶液中镉的置换效果。系统研究了预处理时间、温度、pH值和超声功率密度对置换效率的影响。在优化条件下，与未预处理的铝相比，镉的置换度提高了20.7%，与传统预处理的铝相比提高了3.87%，达到了97.53%。超声会腐蚀铝粉的氧化膜，减少其对电子释放的抑制作用，并为强化置换创造有利氛围。与传统预处理和未预处理的铝相比，超声预处理铝粉的比表面积分别增加了35%和92%，增强了与镉的反应。该工艺能够以更低的铝粉消耗量（减少40%）高效处理更高浓度的镉（增加300%），使其更适合工业规模的高效、清洁和可持续生产。
