微电流作用下铁片置换海绵铋粉

doi:10.3724/SP.J.1095.2013.20612

摘要/Abstract

摘要： 针对铁粉置换沉积海绵铋所得铋粉品位较低的缺点，本工艺采用铁片置换海绵铋，铁片为阳极，石墨为阴极，直流微电流作用，电流密度5×10-3 A/cm2，温度40 ℃，所得海绵状铋粉品位在90%以上。通过置换过程的宏观动力学研究表明，其置换过程符合一级反应速率规律，活化能Ea=13.72 kJ/mol，反应速率方程为v=3.2470×c(Bi3+)exp(-13720/RT)，置换过程的控制步骤为扩散控制。电化学分析结果显示，微电流作用很好的促进了置换过程，且置换海绵状铋粉品位高，杂质少，尤其铅含量明显降低。

关键词: 微电流, 铁片, 置换, 海绵铋, 动力学

Abstract: The sponge powder bismuth replaced by powder iron is low grade. In order to overcome such problem, new approach for producing sponge powder bismuth is developed with the use of iron plates under micro-current. The grade of the obtained sponge powder bismuth is over 90%, which is replaced by iron plates with the use of iron plates as the anode, graphite as the cathode, and the current density is 5×10-3 A/cm2 at a temperature of 40 ℃. Studies on the replacement process have shown that the replacement process meets the first-order reaction rate law, with the activation energy Ea=13.72 kJ/mol, and the reaction is diffusion-controlled. The reaction rate equation is v=3.2470×c(Bi3+)exp(-13720/RT). Electrochemical analysis shows that the micro-current promotes the replacement process, and the obtained sponge powder bismuth is high grade with fewer impurities, in particular, the lead content is significantly reduced.

Key words: Micro-current, iron plates, replacement, sponge bismuth, dynamics

中图分类号:

郭瑞, 何静, 蓝明艳, 王灿, 唐谟堂, 杨建广, 杨声海, 唐朝波, 鲁君乐. 微电流作用下铁片置换海绵铋粉[J]. 应用化学, DOI: 10.3724/SP.J.1095.2013.20612.

HE Jing*, GUO Rui, LAN Mingyan,WANG Can, TANG Motang, YANG Jianguang, YANG Shenghai, TANG Chaobo, LU Junle. Replacement of Sponge Powder Bismuth with Iron Plates Under Micro-current[J]. Chinese Journal of Applied Chemistry, DOI: 10.3724/SP.J.1095.2013.20612.

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