摘要
A method based on controlling the complexation precipitation equilibrium of metal ions was proposed to selectively recover nickel and copper from hydroxide sludge formed by lime neutralization of acid mine drainage(AMD). Ethylenediamine(EDA) and ammonium sulfate were chosen as complex reagent and precipitating reagent, respectively, to dissolve target metal hydroxides from sludge and limit useless metal ions in the pregnant solution. Results from both synthetic and natural samples show the excellent selectivity for the target metals(copper and nickel) against Fe(Ⅲ), Ca(Ⅱ) and Mg(Ⅱ), 99% recovery of Cu(Ⅱ) and Ni(Ⅱ) and shorter leaching time can be reached by this process, and the resultant solution can be used for direct electrowinning. The optimum operating conditions are: pH=9～11, ρ (EDA)=40 g/L, ammonium sulfate 50 g/L, leaching time 5 h(for natural sample) and 2.5 h(for synthetic sludge), liquid to solid ratio being 4 with mechanical stirring at room temperature.
A method based on controlling the complexation precipitation equilibrium of metal ions was proposed to selectively recover nickel and copper from hydroxide sludge formed by lime neutralization of acid mine drainage(AMD). Ethylenediamine(EDA) and ammonium sulfate were chosen as complex reagent and precipitating reagent, respectively, to dissolve target metal hydroxides from sludge and limit useless metal ions in the pregnant solution. Results from both synthetic and natural samples show the excellent selectivity for the target metals(copper and nickel) against Fe(Ⅲ), Ca(Ⅱ) and Mg(Ⅱ), 99% recovery of Cu(Ⅱ) and Ni(Ⅱ) and shorter leaching time can be reached by this process, and the resultant solution can be used for direct electrowinning. The optimum operating conditions are: pH=9～11, ρ (EDA)=40 g/L, ammonium sulfate 50 g/L, leaching time 5 h(for natural sample) and 2.5 h(for synthetic sludge), liquid to solid ratio being 4 with mechanical stirring at room temperature.
出处
《中国有色金属学会会刊：英文版》
EI
CSCD
2002年第6期1176-1179,共4页
Transactions of Nonferrous Metals Society of China
基金
ProjectsupportedbyNSERCStrategicGrantofCanada
关键词
乙二胺
酸性污泥
废物处理
镍
铜
选择性提取
ethylenediamine(EDA)
AMD sludge
selective extraction
waste treatment
nickel
copper
