摘要
研究了电镀污泥中铜、镍的回收方法及工艺。采用硫酸浸出,浸出液在电压为2.4V时电解3.5h,铜的总回收率在99%以上,同时将Fe2+氧化成Fe3+,电解余液(电解铜之后的溶液)加热至90℃,用磷酸盐调节pH至3.0,磷酸钠投加倍数为形成磷酸盐沉淀理论用量的1.4倍,99%的铁、铝、铬被去除,镍的总回收率约在97%以上。
The two-step treatment case of recovering copper （by electrolysis） and nickel （by extraction after removal of other metals by precipitation） from an electroplating sludge was presented. Using sulphuric acid to extract the metals from the sludge, the lixivium was electrolyzed at 2.4 V for 3.5 h for recovery of copper; more than 99% recovery of copper was achieved while the Fe^2＋ was oxidized to Fe^3＋. Then the electrolyte was heated up to 90 ℃, partially neutralized, first by NaOH （to pH=1. 0） and then by phosphate （to pH=3.0）, and then reacted with 1.4 times the theoreetical requirement of sodium phosphate to precipitate more than 99% of soluble Fe, Al and Cr species as iron, aluminium and chromium phosphates. Extraction of the filtrate with P-204 recovered 〉97% of nickel in the sludge. The effects of pH, temperature, electrolysis time on copper recovery and the effects of sodium phosphate dose on metal precipitation were determined.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2008年第7期58-61,共4页
Environmental Pollution & Control
关键词
铜
镍
电镀污泥
磷酸盐沉淀
copper
nickel
electroplating sludge
phosphate precipitation
