Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第29卷    第8期    总第245期    2019年8月

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文章编号:1004-0609(2019)-08-1721-12
废铜包铁针NH3-(NH4)2SO4-H2N(CH2)2NH2体系隔膜电解回收铜
杨建广,李树超,李陵晨,闫万鹏,丁 龙,南天翔

(中南大学 冶金与环境学院,长沙 410083)

摘 要: 以电子加工行业产出的废铜包铁针为阳极,以不锈钢板为阴极,采用单因素试验法优化NH3-(NH4)2SO4-H2N(CH2)2NH2体系隔膜电解回收铜工艺。结果表明:在阴极液组成为NH3·H2O 4.5 mol/L、(NH4)2SO4 1 mol/L、Cu(Ⅱ) 30 g/L、乙二胺0.4 mol/L以及阴极电流密度为350 A/m2的条件下隔膜电解12 h后,在阴极可以得到表面光滑平整的阴极铜板,阴极铜纯度99.95%。由于部分阳极铜以+1价溶解于电解液中,使得实际隔膜电解回收废铜包铁针时阴极电流效率达到106%(以+2价铜电化当量计算),而阳极电流效率则为126%,脱铜后得到的铁针品位为99.3%。

 

关键字: 氨性体系;废杂铜处理;隔膜电解;电流效率;溶液循环

Copper recovery from scrap copper coated iron needle via membrane electrolysis in NH3-(NH4)2SO4-H2N(CH2)2NH2 system
YANG Jian-guang, LI Shu-chao, LI Ling-chen, YAN Wan-peng, DING Long, NAN Tian-xiang

School of Metallurgy and Environmental, Central South University, Changsha 410083, China

Abstract:Using scrap copper coated iron needle as anode and stainless steel plate as cathode,the membrane electrolytic recovery of copper from scrap copper coated iron needle viaNH3-(NH4)2SO4-H2N(CH2)2NH2 system was optimized by single factor test. The experimental results show that, when the catholyte composition is NH3·H2O 4.5 mol/L,(NH4)2SO4 1mol/L, Cu (Ⅱ) 30 g/L, ethylenediamine 0.4 mol/L, and the cathode current density is 350 A/m2, a smooth cathode copper plate can be obtained at the cathode for 12 h electrowinning, and the grade of resultant cathode copper is 99.95%. The cathode current efficiency is 106% (calculated at +2 valence copper electrification equivalent), while the anode current efficiency is 126%, because some anode copper dissolves in the electrolyte at +1 valence. The grade of iron needle obtained after copper removal is 99.3%.

 

Key words: ammoniacal system; copper scraps treatment; membrane electrowinning; current efficiency; effluent recycle

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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