摘要
The extraction and stripping of Cu and Ni ions from synthetic and industrial solutions of Sarcheshmeh Copper Mine containing Cu(770 mg/L),Ni(3200 mg/L),Fe(800 mg/L)and Zn(200 mg/L)were comprehensively investigated using D2 EHPA,LIX 984,Cyanex 302,Chemorex CP 150 and Acorga 5774 diluted in kerosene.The influential parameters such as mixing speed and time,concentration of extractant,p H and temperature were considered in extraction stage.Furthermore,stripping of Cu and Ni was examined using different inorganic and organic acids(sulfuric,hydrochloric,nitric and citric acids)with different concentrations.The results indicated that the highest extractions of Cu and Ni occurred within 3 min,with the mixing speed of 500 r/min,28℃and A/O ratio of 1:1.Moreover,Cu was extracted by LIX 984 at the concentration of 10%(v/v),whereas Ni was extracted by Cyanex 302 at the concentration of 30%(v/v),efficiently.The optimal p H for Cu and Ni extraction is in ranges of 2-3 and 4-5,respectively.Cu and Ni were selectively extracted with the recoveries of 85%,93%and 77%,82%from synthetic and industrial solutions containing Ni,Cu,Zn and Fe ions,respectively.The results of optimal condition showed that 96%of Ni and 93%of Cu were stripped from the synthetic and industrial solutions.Finally,four elements Zn,Fe,Cu and Ni were extracted in three stages with D2 EHPA,LIX 984 and Cyanex 302 extractants respectively with the least impurities.
以D2EHPA、LIX 984、Cyanex 302、Chemorex CP 150和Acorga 5774为萃取剂,煤油为稀释剂,对取自Sarcheshmeh铜矿含Cu(770mg/L)、Ni(3200mg/L)、Fe(800mg/L)和Zn(200mg/L)的合成及工业溶液中Cu和Ni的萃取与反萃进行全面研究。萃取阶段考虑的影响因素有混合速度和时间、萃取剂浓度、p H和温度。此外,采用不同浓度的各种无机和有机酸(硫酸、盐酸、硝酸和柠檬酸)对Cu和Ni进行反萃。结果表明,在时间为3 min、混合速度为500 r/min、温度为28℃以及A/O比为1:1的条件下,Cu和Ni的萃取率最高。此外,用10%(v/v)LIX984可有效萃取Cu,而用30%(v/v)Cyanex 302可有效萃取Ni。萃取Cu和Ni的最佳p H分别为2~3和4~5。从含Ni、Cu、Zn和Fe离子的合成及工业溶液中可选择性萃取Cu和Ni,其萃取率分别为85%、93%和77%、82%。最佳条件实验结果表明,合成及工业溶液中Ni的反萃率达96%,Cu的反萃率为93%。最后,分别用D2EHPA、LIX 984和Cyanex 3023种萃取剂分3个阶段萃取Zn、Fe、Cu和Ni 4种元素,而杂质萃取率最低。
