(中南大學(xué) 化學(xué)化工學(xué)院，長(zhǎng)沙 410083)
摘 要: 以Cu2+-NH3-Cl−-H2O氨性溶液為被萃水相，研究高位阻β−二酮和LIX 84混合萃取劑對(duì)銅的萃取。考察混合萃取劑β−二酮和LIX 84總濃度及相對(duì)含量、被萃水相pH值及總氨濃度和相比等因素對(duì)銅萃取的影響。結(jié)果表明，最優(yōu)萃取條件如下：β−二酮與LIX 84的體積比為1:1，萃取劑濃度為20 %，水相銅離子濃度為3 g/L，總氨濃度為3 mol/L(氨與氯化銨的摩爾比為1:2)，初始pH值為8.95，相比(O/A)為1:1，反萃劑(硫酸)濃度為90 g/L。在此最優(yōu)條件下，銅萃取率接近100 %，共萃氨量為36.1 mg/L，反萃率達(dá)97 %。
關(guān)鍵字: 氨性溶液；萃取劑；萃取；銅；共萃氨
sterically hindered β-diketone and LIX 84
（School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China）
Abstract:The extraction performance of copper with a sterically hindered β-diketone and LIX 84 from Cu2+-NH3-Cl−-H2O ammonia solutions was studied. The effects of extractant concentration, relative content of β-diketone and LIX 84 in organic phase, pH of aqueous phase, total ammonia concentration and phase ratio on copper extraction were tested. The results indicate that the optimum extraction conditions are as follows: the relative content of β-diketone and LIX 84 is 1:1, the concentration of extractant is 20%, the concentration of copper and total ammonia is 3 g/L and 3 mol/L, respectively, pH of aqueous phase is 8.95, phase ratio is 1:1, and the stripping concentration of sulphuric acid is 90 g/L. Under the optimum extraction condition, the extraction rate and stripping efficiency are nearly 100% and 97%, respectively, and the co-extraction ammonia is only 36.1 mg/L.
Key words: ammonia solution; extractant; solvent extraction; copper; co-extraction ammonia
