Zhang Yuhui, He Kunyun, Jin Bingjie, Luan Jin
School of Chemistry, Biology and Environment, Yuxi Normal University, Yuxi, Yunnan 653100, PR China.
Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, PR China.
ACS Omega. 2024 Dec 8;9(50):49778-49785. doi: 10.1021/acsomega.4c08470. eCollection 2024 Dec 17.
At present, the refining of crude solder has many drawbacks such as high energy consumption, high environmental pollution, equipment corrosion, and low current efficiency. Therefore, a new technique for refining crude solder is of great practical importance. In this work, the electrorefining of crude solder in methanesulfonic acid (MSA) medium was studied. The conductivities of tin-MSA solutions had been measured and modeled to characterize the electrolyte. The effects of the electrorefining conditions on the electrorefining process were investigated systematically. The cell voltage, current efficiency, and fine solder appearance were used to characterize the electrorefining performance. Some operating parameters of the electrorefining process are established as follows: current density 207 A/m, tin concentration 120-160 g/L, free-MSA concentration 90-120 g/L, electrode spacing 4 cm, and temperature 305.15-315.15 K. Under these conditions, the average cell voltage is 0.30 V and the current efficiency is 99.31%. The total content of tin and lead of the fine solder with good product appearance is >99.99%. This technique offers low energy consumption, high productivity, and low environmental pollution.
目前，粗焊料的精炼存在诸多弊端，如高能耗、高环境污染、设备腐蚀以及低电流效率等。因此，一种新型的粗焊料精炼技术具有重大的实际意义。在本工作中，对在甲磺酸（MSA）介质中粗焊料的电精炼进行了研究。已测量并模拟了锡 - MSA 溶液的电导率以表征电解质。系统地研究了电精炼条件对电精炼过程的影响。采用槽电压、电流效率和精焊料外观来表征电精炼性能。确定了电精炼过程的一些操作参数如下：电流密度 207 A/m，锡浓度 120 - 160 g/L，游离 MSA 浓度 90 - 120 g/L，电极间距 4 cm，温度 305.15 - 315.15 K。在这些条件下，平均槽电压为 0.30 V，电流效率为 99.31%。产品外观良好的精焊料中锡和铅的总含量>99.99%。该技术具有低能耗、高生产率和低环境污染的特点。
