二异戊基硫醚萃钯过程中少量铂发生共萃原因的探讨(英文)  

Causes of Coextraction Behavior of a Small Amount of Platinum(Ⅱ) in Extracting Palladium(Ⅱ) with Sulfide

作　　者：王世雄[1] 徐艳[1] 吴万富 史德强[1] 郭洪[1] 杨项军[1] 

机构地区：[1]云南大学,云南昆明650091

出　　处：《稀有金属材料与工程》2016年第S1期63-67,共5页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51464044);Academician Free Inquiry Project(2013HA010,2014HA010)

摘　　要：针对二异戊基硫醚(S_(201))萃钯过程中少量铂发生共萃的现象,用S_(201)对Pt(II)和Pt(IV)分别进行了萃取实验研究。文中对萃取剂浓度、相调节剂种类、混相时间以及盐酸浓度等影响条件进行了考察。结果表明,S_(201)对Pt(IV)几乎不萃取,对Pt(Ⅱ)有一定的萃取能力(<20%)。水相中盐酸浓度增高时,Pt(Ⅱ)萃取率降低;混相时间增加及温度升高时,Pt(Ⅱ)萃取率逐渐增高;有机相中S_(201)浓度增高及改性剂TBP或异辛醇浓度增高时,Pt(Ⅱ)萃取率明显增高。还分别讨论了S_(201)萃取Pt(IV)和Pt(II)的机理。研究发现,将Pt(II)氧化为Pt(IV)后,S_(201)对铂的萃取率从2.34%降低至0.85%,提出将铂的价态控制在四价是降低铂与钯共萃的有效措施。A small amount of platinum will be coextracted with palladium when we recover palladium by Diisopentyl sulfide(S201) extraction. Therefore, this paper explores the solvent extraction of Pt(IV) and Pt(II) using S201 as an extractant. The results show that less than 20% of Pt(II) can be extracted under the optimum conditions, whereas Pt(IV) is hardly extracted by S201. The Pt(II) extraction percentage decreases with an increase of hydrochloric acid concentration in aqueous phase. Elevating reaction temperature and prolonging the contact time of organic and aqueous phase have favorably influences on the Pt(II) extraction. In addition, the extraction rate can be significantly increased with the increase in either S201 concentration or modifier TBP concentration. The paper also discusses the exaction mechanism of Pt(IV) and Pt(II). The platinum extraction efficiency decreases from 2.34% to 0.85% after oxidizing Pt(II) to Pt(IV). The results suggest that the effective method of reducing coextraction of platinum with palladium using S201 as extractant is to maintain the valence state of platinum in four.

关 键 词：共萃取 钯(II) 铂(II) 铂(IV) 机理 

分 类 号：TF83[冶金工程—有色金属冶金]