(云南大學(xué) 化學(xué)科學(xué)與工程學(xué)院，昆明 650091)
摘 要: 通過(guò)測(cè)定叔胺(N235)萃取Pt體系中HCl及H2PtCl6在兩相中的分配，測(cè)定第三相的電導(dǎo)率、體積和水分含量，研究第三相的形成以及各因素對(duì)萃取Pt的影響。結(jié)果表明：無(wú)論在有機(jī)相中有無(wú)改性劑TBP存在時(shí)，無(wú)論c(HCl)init高或低，叔胺萃取H2PtCl6的萃取率均較高，且一級(jí)萃取率大于99%；稀釋劑的種類影響第三相的體積、電導(dǎo)率和水含量，但不影響對(duì)Pt的萃取率；以C12H26為稀釋劑逐級(jí)萃取Pt時(shí)，有機(jī)相中Pt的濃度大于13.21 g/L時(shí)，即出現(xiàn)第三相；以磺化煤油為稀釋劑時(shí)，有機(jī)相中Pt濃度可以高達(dá)23.72 g/L，但不出現(xiàn)第三相。
關(guān)鍵字: 鉑；溶劑萃取；叔胺；第三相
（School of Chemical Science and Technology, Yunnan University, Kunming 650091, China）
Abstract:The formation of the third phase and the influence of different effect factors on Pt extraction in the N235/HCl/Pt solvent extraction system were investigated by determining the distribution of HCl and H2PtCl6 in organic and aqueous phase, as well as determining the conductivity, volume and water content of the third phase. The results show that H2PtCl6 can be extracted efficiently by tertiary amine N235 no matter under the condition of with or without modifier TBP in the organic phase at high or low initial HCl concentration. And the first step extraction rate is more than 99%. The variety of diluent affects the volume, conductivity and water content of the third phase. However, it has no effect on the Pt extraction rate. In addition, in a gradual step extracting Pt system using C12H26 as the diluent, the Pt concentration in organic phase can reach more than 13.21 g/L without the formation of the third phase. While using sulfonated kerosene as the diluent, the Pt concentration in organic phase can reach more than 23.72 g/L without the formation of the third phase.
Key words: platinum; solvent extraction; tertiary amine; third phase
