TBP对LIX84由Cu^(2+)-NH_3-Cl^--H_2O系萃取铜及氨的影响

Extraction of Copper and Ammonia from Cu^(2+)-NH_3-Cl^--H_2O System with Mixture of LIX84 and TBP

以Cu2+-NH3-Cl--H2O氨性溶液为被萃水相,在LIX84中添加磷酸三丁酯(TBP),考察了有机相中TBP浓度、被萃水相铜离子浓度、总氨浓度和pH值及相比、LIX84浓度对铜萃取率、共萃氨量的影响.结果表明,随LIX84中TBP浓度升高,铜萃取率变化不大,负载有机相的共萃氨量明显降低.有机相中TBP浓度为0.1mol/L、LIX84浓度为40%、被萃水相铜离子浓度25g/L、总氨浓度3mol/L及pH值9.1、相比1:1、萃取时间30min时,铜萃取率约为81%,与未添加TBP时基本一致,而负载有机相的共萃氨量由未添加TBP时的260mg/L降至添加TBP后的85mg/L.

With Cu^2＋ -NH3-Cl^- -H2O solution as ammoniacal solution, the copper extraction rate and ammonia extraction were investigated. The effects of concentration of Tributyl phosphate （TBP） in the organic phase, concentration of copper ion, total ammonia concentration and pH in the aqueous phase, phase ratio and concentration of LIX84 on copper extraction rate and ammonia extraction in the loaded organic phase were studied. The experimental results show that with the increase of TBP concentration in LIX84, copper extraction rate had little effect, while the ammonia extraction in the organic phase significantly decreased. When the copper concentration in the aqueous phase and total ammonia concentration were 25 g/L and 3 mot/L, respectively, the pH of aqueous phase was 9.1. The solvent extraction with 40%（φ） LIX84 adding 0.1 mol/L TBP in the organic phase and a phase ratio of 1：1 in 30 min of contact resulted in 81% of copper extraction rate and 85 mg/L of ammonia extraction in the loaded oil phase, while the copper extraction rate and ammonia extraction in the loaded organic phase in the absence of TBP were 81% and 260 mg/L, respectively.