论文部分内容阅读
近期研究工作表明,用有机磷酸酯能从氰化物的碱性溶液中选择性地溶剂化萃取氰亚金酸盐的离子对络合物。烷基磷酸酯(诸如磷酸三丁酯——TBP和了基膦酸二丁酯——DBBP)选择性萃取金的容量相当高,甚至可达30g/1以上。然而,传统的反萃取技术的效果不佳。采用直接电解有机相的方法回收金具有实际应用的可能性。使用水相与有机相的混合液,可大幅度地提高直接从有机相中电积金的速率。本研究工作在电流密度为8×10~(-4)4A/cm~2和温度为55℃的条件下,从以水相为连续相的两相混合液的载金DBBP直接电积出了金箔。在5个萃取-电积循环之后,DBBP并无明显的降解。对氰亚金酸盐电镀废液的成功处理,证明本方法可在工业上应用。
Recent work has shown that organophosphates can be used to selectively solvate ion-pair complexes of cyanurate from an alkaline solution of cyanide. The capacity for the selective extraction of gold from alkyl phosphates (such as tributyl phosphate-TBP and dibutyl-phosphonate-DBBP) is quite high, even up to 30 g / l. However, the traditional anti-extraction technology is not effective. The use of direct electrolysis of the organic phase recovery gold has the practical application of the possibility. The use of a mixture of aqueous and organic phases dramatically increases the rate of electrodeposited gold directly from the organic phase. In this study, the current density of 8 × 10 -4 (4A / cm 2) and the temperature of 55 ℃, from the aqueous phase as the continuous phase of the two-phase mixture of DBBP direct electrowinning Gold foil. After 5 extraction-electrowinning cycles, DBBP did not show significant degradation. The successful treatment of the bath of cyanide gold plating demonstrates that the process is industrially applicable.