In this study, the dissolution kinetics of metallic zinc pieces obtained from waste zinc–carbon batteries was investigated using nitric acid solutions. The effects of the concentration of nitric acid, amount of metallic zinc, reaction temperature and stirring speed on the dissolution process were determined, and a mathematical model to represent the dissolution kinetics was presented. It was observed that the dissolution rate increased with increasing nitric acid concentration, stirring speed and reaction temperature and with decreasing amount of metallic zinc. While the concentration of nitric acid, reaction temperature, stirring speed, amount of zinc, and reaction time were 0.15 M, 30°C, 400 rpm, 0.1 g, and 20 min, respectively, the amount of dissolved zinc was found to be 98.3%. The result of the kinetic analysis showed that the dissolution rate fit to the pseudo‐first order kinetic. The activation energy for the dissolution process was calculated to be 12.89 kJ/mol. It was determined that the dissolution process was controlled by diffusion. Zinc ions in the resulting solution after the dissolution treatment was recovered by precipitation method using sodium bicarbonate solution. It was determined that zinc ions were precipitated as zinc hydroxy‐carbonate compound. Zinc compound obtained was subjected to the calcination treatment, and zinc oxide was produced.

中文翻译：

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从废碳锌电池中获得的金属锌在硝酸溶液中的溶解动力学

在这项研究中，使用硝酸溶液研究了从废锌碳电池中获得的金属锌碎片的溶解动力学。确定了硝酸浓度，金属锌量，反应温度和搅拌速度对溶解过程的影响，并建立了代表溶解动力学的数学模型。观察到，溶解速率随着硝酸浓度，搅拌速度和反应温度的增加以及金属锌含量的减少而增加。硝酸浓度，反应温度，搅拌速度，锌量和反应时间分别为0.15 M，30°C，400 rpm，0.1 g和20分钟时，发现溶解的锌量为98.3。 ％。动力学分析结果表明，溶出度符合拟一级动力学。溶解过程的活化能经计算为12.89 kJ / mol。可以确定溶解过程是通过扩散控制的。溶解处理后所得溶液中的锌离子通过使用碳酸氢钠溶液的沉淀法回收。已确定锌离子以羟基碳酸锌化合物的形式沉淀。对得到的锌化合物进行煅烧处理，从而生成氧化锌。溶解处理后所得溶液中的锌离子通过使用碳酸氢钠溶液的沉淀法回收。已确定锌离子以羟基碳酸锌化合物的形式沉淀。对得到的锌化合物进行煅烧处理，从而生成氧化锌。溶解处理后所得溶液中的锌离子通过使用碳酸氢钠溶液的沉淀法回收。已确定锌离子以羟基碳酸锌化合物的形式沉淀。对得到的锌化合物进行煅烧处理，从而生成氧化锌。