BK992萃取除铜净化硫酸镍钴溶液

Extraction of copper from nickel and cobalt sulfate solution with BK992

以BK992为萃取剂,从废镍合金硫酸溶液中萃取分离铜,研究了pH值、相比(O/A)、BK992浓度和萃取时间对萃取的影响,确定了BK992萃取铜的优化条件。结果表明BK992的萃铜速度很快,随着pH值升高,铜萃取率增大,但当pH大于4.0时,镍钴损失较大;相比越大,萃取分离效果越好;BK992浓度的影响也较大,随着BK992浓度增加,铜分配比增大。室温下BK992萃取铜的最佳工艺条件BK992浓度为20%,相比O/A为1∶2,水相初始pH为3.0,萃取时间为10min。在优化条件下,待处理液的一级萃取率达93.06%,20%BK992萃铜的饱和容量为17.30g/L;一级反萃率达91.79%,铜净传递量为15.88g/L。

Copper was extracted from nickel and cobalt sulfate with BK992. The effects of pH of aqueous solution, the phase ratio(O/A), concentration of BK992 and reaction time on the extraction were investigated. The results show that the extraction reaches equilibrium quickly. With increasing pH of the aqueous solution, the effect of copper extraction from the solution is improved greatly, but the mass loss of nickel and cobalt occurs when the pH is ~above 4.0. The bigger the O/A ratio is, the better the effect of the extraction is. With the increasing content of BK992, the distribution ratio of copper increases. The optimum conditions are determined that concentration of BK992 in the organic phase is 20% (volume fraction), the phase ratio (O/A) is 1∶2, pH of the aqueous solution is 3.0, and the reaction time is 10min. Under the optimized operating conditions, copper can be extracted effectively and the extraction rate at the first stage reaches 93.06%, the extraction capacity of BK992 is 17.30g/L and the stripping rate reaches ~91.79% , the pure transfer mass of copper is 15.88g/L.