In this study, the leaching kinetics of manganese oxide powder supplied from spent alkaline batteries was investigated in H₂SO₄ solutions including molasses. Waste battery powder containing manganese oxides was prepared by separating manually from the other components of the collected waste alkaline batteries. The leaching experiments were carried out in a batch reactor. The effects of H₂SO₄ concentration, stirring speed, solid-to-liquid ratio, reaction temperature, particle size, and amount of molasses on the leaching rate of manganese were studied. It was determined that molasses used as the reducing agent had an important effect on the leaching rate. By adding molasses to the leaching media, it was found that almost all manganese in waste battery powder transferred to the solution. It was observed that the leaching rate increased with an increase in the solution concentration, stirring speed, reaction temperature, and amount of molasses, and with a decrease in the particle size and solid-to-liquid ratio. While the concentration of H₂SO₄, stirring speed, solid-to-liquid ratio, reaction temperature, particle size, amount of molasses, and reaction time were 1 M, 500 rpm, 2/500 g/mL, 60 °C, 0.348 mm, 2 g, and 120 min, respectively, the amount of the dissolved manganese was found to be approximately 98%. A mathematical model represented that the leaching kinetics was elaborated. It was determined that the leaching kinetics followed the mixed kinetic model. The activation energy value for the process was calculated to be 52.31 kJ/mol. After the leaching treatment, Mn (II) ions in the solution were recovered in the form of MnCO₃ using NaHCO₃ solution. MnCO₃ was calcined isothermally at 400 °C for 4 h, and MnO₂ was produced.

Graphical Abstract

中文翻译：

---

废碱性电池中锰氧化物在含糖浆硫酸溶液中的浸出动力学

在这项研究中，研究了废碱性电池提供的氧化锰粉末在包括糖蜜的 H ₂ SO _{4溶液中的浸出动力学。}通过人工将收集到的废碱性电池的其他成分分离，制备出含锰氧化物的废电池粉末。浸出实验在间歇式反应器中进行。H ₂ SO _4的影响研究了浓度、搅拌速度、料液比、反应温度、粒度、糖蜜用量对锰浸出率的影响。已确定用作还原剂的糖蜜对浸出率具有重要影响。通过在浸出介质中添加糖蜜，发现废电池粉末中几乎所有的锰都转移到了溶液中。观察到浸出率随着溶液浓度、搅拌速度、反应温度和糖蜜量的增加而增加，随着粒径和固液比的降低而增加。而 H ₂ SO _4的浓度, 搅拌速度, 固液比, 反应温度, 粒径, 糖蜜量, 反应时间分别为 1 M, 500 rpm, 2/500 g/mL, 60 °C, 0.348 mm, 2 g, and 120分钟，分别发现溶解的锰的量约为 98%。数学模型代表了浸出动力学的详细说明。确定浸出动力学遵循混合动力学模型。该过程的活化能值计算为 52.31 kJ/mol。浸出处理后，使用NaHCO _{3溶液以MnCO 3}的形式回收溶液中的Mn(II)离子。将MnCO ₃在400 ℃等温煅烧4 h，生成MnO ₂。

图形概要