卤素法电镀锡阳极泥中锡的碱浸回收及动力学分析

以NaOH溶液为浸出剂,采用碱浸法回收卤素法电镀锡阳极泥中的锡,考察了浸出效果的影响因素,并对浸出过程的动力学进行了研究。实验结果表明:在NaOH质量浓度200 g/L、反应温度90℃、液固比6、反应时间240 min的最佳工艺条件下,锡的浸出率约为98%;最佳工艺条件下,浸出液中的氟离子对后续锌粉置换回收锡没有影响;在303.15~363.15 K范围内,该浸出过程主要受内扩散控制,反应活化能为9.725 k J/mol。

Recovery of tin from tin-plating anode slime by halogen method via alkaline leaching and its kinetics analysis

Tin in anode slime from tin-plating by halogen method,was recovered by alkali leaching with NaOH solution as leaching agent. The influence factors and kinetics of the leaching process were investigated. The experimental results showed that：Under the optimum process conditions of NaOH mass concentration 200 g/L,leaching temperature of 90 ℃,liquid-solid ratio 6 and leaching time 240 min,the leaching rate of tin was about 98%,and fluorine ion in the leached solution had no effect on tin recovery by replacement with zinc powder;In the range of 303.15-363.15 K,the leaching process was controlled by the inner diffusion and the apparent activation energy was 9.725 kJ/mol.