TOA-TBP从铁合金萃钯余液中协同萃取分离铂

以等离子炉富集产出的铂钯铑铁合金溶解造液萃钯后的余液为原料，选择TOA-TBP混合萃取剂萃取分离铂。研究单一TBP、TOA以及混合体系对铂的萃取行为。结果表明，对于贱金属较高的溶液体系，100%TBP对铂的萃取率仅有80.9%，单一TOA在高浓度下铂的萃取率接近100%，但铑的共萃率也随之上升，最高可达到82.86%。而95%TBP-5%TOA的混合体系在0.5 mol/L HCI，相比为1，旋转速度100 r/min条件下，铂的萃取率达到99.9%以上，铑的共萃率仅为0.2%。选择稀盐酸洗涤负载有机相，10 mol/L盐酸反萃，铂的反萃率达到97.2%。TOA-TBP混合体系可以实现铂铑高效分离，且该体系对铂的萃取具有协同效应。

TOA-TBP Synergistic Extraction of Platinum from Palladium Raffinate of Ferroalloy Extraction

The residual raffinate was used as raw material after Pt-Pd-Rh-Fe alloy enriched by plasma furnace was dissolved and extracted for palladium, and TOA-TBP mixed extractant was selected to extract and separate platinum. The extraction behavior of platinum by single TBP, TOA and mixed systems was studied. The results show that platinum extraction rate by 100% TBP is only 80.9% for the solution system with high base metals, and platinum extraction rate by 100% TOA at high concentration is close to 100%, however, the co-extraction rate of rhodium also increases, the highest up to 82.86%. The extraction rate of platinum is 99.9% above and co-extraction rate of rhodium is only 0.2% by mixed system of 95%TBP-5%TOA under the conditions including HCI concentration of 0.5 mol/L, phase ratio of 1, and rotation speed of 100 r/min. The stripping rate of platinum with 10 mol/L hydrochloric acid is 97.2% after loaded organic phase is washed by dilute hydrochloric acid. TOA-TBP mixed system can achieve efficient separation of platinum and rhodium, and this system has a synergistic effect on extraction of platinum.