Copper is one of the most important valuable elements in waste printed circuit boards (WPCBs), which can be finally recovered by hydrometallurgy. Environmentally-friendly copper leaching technology has become critical. In this study, two environmentally friendly leaching systems, namely ammonia-ammonium chloride leaching system and glycine-hydrogen peroxide leaching system, on copper leaching behavior was concerned, the influence of leaching time and leaching agent concentration on leaching rate of copper concentrate with different size was revealed. In addition, a simple but effective leaching kinetics model were proposed. The results show that with the extension of time, the leaching rate increases rapidly at first (0–10 min) and then slowly (10–25 min) until stable. The optimum leaching concentration of ammonia is 3 mol/L. For ammonia leaching system, the leaching rate increased from 76.92% to 90.05% with the decrease of particle size. Meanwhile, the leaching rate increased from 77.32% to 87.93% in the glycine leaching system. Finer particles have a larger contact area, resulting in higher leaching rates. The simple leaching kinetics model proposed in this study can accurately describe the leaching process of copper. These two environmentally friendly leaching systems can be used as substitutes for traditional inorganic acids.

铜是废印刷电路板 (WPCB) 中最重要的有价值元素之一，最终可以通过湿法冶金回收。环保的铜浸出技术变得至关重要。本研究采用氨-氯化铵浸出系统和甘氨酸-过氧化氢浸出系统两种环保浸出系统对铜的浸出行为进行了研究，探讨了浸出时间和浸出剂浓度对不同粒度铜精矿浸出率的影响。被揭露。此外，一种简单但有效的浸出提出了动力学模型。结果表明，随着时间的延长，浸出率先快速增加（0~10 min），然后缓慢增加（10~25 min）直至稳定。氨的最佳浸出浓度为3 mol/L。对于氨浸出系统，随着粒径的减小，浸出率从76.92%提高到90.05%。同时，甘氨酸浸出系统的浸出率从77.32%提高到87.93%。更细的颗粒具有更大的接触面积，从而导致更高的浸出率。本研究提出的简单浸出动力学模型可以准确描述铜的浸出过程。这两种环境友好的浸出系统可用作传统无机酸的替代品。