采用DZ988N从复杂硫酸盐溶液中高效选择性萃取铜
Selective and efficient extraction of Cu(II) from a complex sulfate solution containing Co(II), Fe(II), Cu(II), and Zn(II) using DZ988N
何静 1曹姝琼 1陈永明 1柳涛 1李云 2廖方文 1代杰 1介亚菲1
作者信息
- 1. School of Metallurgy and Environment,Central South University,Changsha 410083,China
- 2. School of Metallurgy and Environment,Central South University,Changsha 410083,China;Chinese National Engineering Research Center for Control&Treatment of Heavy Metal Pollution,Changsha 410083,China
- 折叠
摘要
采用鳌合萃取剂DZ988N从含Co(II)、Fe(II)、Cu(II)和Zn(II)的硫酸浸出液中分离铜,并对其螯合机理进行了研究.为了优化DZ988N的萃取工艺,通过单因素实验考察了萃取剂浓度(体积比)、水相初始pH值、萃取温度、时间与相比对金属萃取率(ηM)和分离系数(βCu/Co、βCu/Fe和βCu/Zn)的影响,得到DZ988N萃取铜的最优条件为:萃取剂DZ988N浓度25％,水相pH 2.0,萃取温度25°C,时间6 min,相比O/A=1/1.5.在此最优条件下,铜的一级萃取率达97.53％,而钴、铁和锌基本不被萃取.此外,采用平衡等温线法确定不同相比下的逆流萃取级数.研究结果表明,当萃取相比为1:1.0,1:1.5和1:2.0时,若使萃余液中铜离子浓度[Cu2+]aq不超过0.005 g/L,所需逆流萃取级数分别为2级、2级和3级.在最优条件下对硫酸浸出液进行2级逆流萃取铜,[Cu2+]aq=0.0044 g/L,铜萃取率达99.92％.
Abstract
DZ988N, a kind of chelating extractant, was used to separate copper from the sulfuric acid leaching solution of a polymetallic residue containing Co(II), Fe(II), Cu(II) and Zn(II), and its chelating mechanism was investigated. In order to optimize the DZ988N extraction process, the effects of DZ988N concentration (v/v), pH value of aqueous phase, extraction temperature, time and phase volume ratio (O/A) on metal extraction efficiency (ηM) and separation coefficient (βA/B), were determined in detail. It was found that, under the optimal extraction conditions of DZ988N concentration (v/v) of 25％, pH value of aqueous phase of 2.0, extraction temperature of 25 °C, time of 6 min, and phase volume ratio (O/A) of 1/1.5, the single-stage extraction efficiency of Cu(II) was 97.53％, while Fe(II), Co(II) and Zn(II) were basically remained. In addition, extraction isotherms diagram (McCabe-Thiele diagram) was built to determine that a two-stage counter-current extraction is needed. Under the optimal conditions, the copper extraction efficiency was 99.92％ and stripped rate was 99.2％. Finally, 99.63％ Cu was enriched into the stripped solution with 7.85 g/L Cu2+, and 0.38％ was lost.
关键词
铜萃取/鳌合机理/分离系数/等温线图Key words
copper extraction/chelating mechanism/separation coefficient/McCabe-Thiele isotherm diagram引用本文复制引用
基金项目
National Key R&D Program of China(2018YFC1902006)
出版年
2023
NETL
NSTL
维普
万方数据